[v2,1/3] media: V3s: Add support for Allwinner CSI.

Commit Message

yong July 27, 2017, 5:01 a.m. UTC

Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
and CSI1 is used for parallel interface. This is not documented in
datasheet but by testing and guess.

This patch implement a v4l2 framework driver for it.

Currently, the driver only support the parallel interface. MIPI-CSI2,
ISP's support are not included in this patch.

Signed-off-by: Yong Deng <[e-mail]>
---
 drivers/media/platform/Kconfig                   |   1 +
 drivers/media/platform/Makefile                  |   2 +
 drivers/media/platform/sun6i-csi/Kconfig         |   9 +
 drivers/media/platform/sun6i-csi/Makefile        |   3 +
 drivers/media/platform/sun6i-csi/sun6i_csi.c     | 545 +++++++++++++++
 drivers/media/platform/sun6i-csi/sun6i_csi.h     | 203 ++++++
 drivers/media/platform/sun6i-csi/sun6i_csi_v3s.c | 827 +++++++++++++++++++++++
 drivers/media/platform/sun6i-csi/sun6i_csi_v3s.h | 206 ++++++
 drivers/media/platform/sun6i-csi/sun6i_video.c   | 663 ++++++++++++++++++
 drivers/media/platform/sun6i-csi/sun6i_video.h   |  61 ++
 10 files changed, 2520 insertions(+)
 create mode 100644 drivers/media/platform/sun6i-csi/Kconfig
 create mode 100644 drivers/media/platform/sun6i-csi/Makefile
 create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi.c
 create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi.h
 create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi_v3s.c
 create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi_v3s.h
 create mode 100644 drivers/media/platform/sun6i-csi/sun6i_video.c
 create mode 100644 drivers/media/platform/sun6i-csi/sun6i_video.h

Comments

Baruch Siach July 27, 2017, 12:16 p.m. UTC | #1

Hi Yong,

I managed to get the Frame Done interrupt with the previous version of this 
driver on the A33 OLinuXino. No data yet (all zeros). I'm still working on it.

One comment below.

On Thu, Jul 27, 2017 at 01:01:35PM +0800, Yong Deng wrote:
> Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> and CSI1 is used for parallel interface. This is not documented in
> datasheet but by testing and guess.
> 
> This patch implement a v4l2 framework driver for it.
> 
> Currently, the driver only support the parallel interface. MIPI-CSI2,
> ISP's support are not included in this patch.
> 
> Signed-off-by: Yong Deng <[e-mail]>
> ---

[...]

> +static int update_buf_addr(struct sun6i_csi *csi, dma_addr_t addr)
> +{
> +	struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> +	/* transform physical address to bus address */
> +	dma_addr_t bus_addr = addr - 0x40000000;

What is the source of this magic number? Is it platform dependent? Are there 
other devices doing DMA that need this adjustment?

baruch

> +
> +	regmap_write(sdev->regmap, CSI_CH_F0_BUFA_REG,
> +		     (bus_addr + sdev->planar_offset[0]) >> 2);
> +	if (sdev->planar_offset[1] != -1)
> +		regmap_write(sdev->regmap, CSI_CH_F1_BUFA_REG,
> +			     (bus_addr + sdev->planar_offset[1]) >> 2);
> +	if (sdev->planar_offset[2] != -1)
> +		regmap_write(sdev->regmap, CSI_CH_F2_BUFA_REG,
> +			     (bus_addr + sdev->planar_offset[2]) >> 2);
> +
> +	return 0;
> +}

Maxime Ripard July 27, 2017, 12:25 p.m. UTC | #2

On Thu, Jul 27, 2017 at 03:16:44PM +0300, Baruch Siach wrote:
> Hi Yong,
> 
> I managed to get the Frame Done interrupt with the previous version of this 
> driver on the A33 OLinuXino. No data yet (all zeros). I'm still working on it.
> 
> One comment below.
> 
> On Thu, Jul 27, 2017 at 01:01:35PM +0800, Yong Deng wrote:
> > Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> > and CSI1 is used for parallel interface. This is not documented in
> > datasheet but by testing and guess.
> > 
> > This patch implement a v4l2 framework driver for it.
> > 
> > Currently, the driver only support the parallel interface. MIPI-CSI2,
> > ISP's support are not included in this patch.
> > 
> > Signed-off-by: Yong Deng <[e-mail]>
> > ---
> 
> [...]
> 
> > +static int update_buf_addr(struct sun6i_csi *csi, dma_addr_t addr)
> > +{
> > +	struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> > +	/* transform physical address to bus address */
> > +	dma_addr_t bus_addr = addr - 0x40000000;
> 
> What is the source of this magic number? Is it platform dependent? Are there 
> other devices doing DMA that need this adjustment?

This is the RAM base address in most (but not all) Allwinner
SoCs. You'll want to use PHYS_OFFSET instead.

Maxime

Maxime Ripard July 28, 2017, 4:02 p.m. UTC | #3

Hi, 

Thanks for the second iteration!

On Thu, Jul 27, 2017 at 01:01:35PM +0800, Yong Deng wrote:
> Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> and CSI1 is used for parallel interface. This is not documented in
> datasheet but by testing and guess.
> 
> This patch implement a v4l2 framework driver for it.
> 
> Currently, the driver only support the parallel interface. MIPI-CSI2,
> ISP's support are not included in this patch.
> 
> Signed-off-by: Yong Deng <[e-mail]>

There's a significant amount of checkpatch warnings (and quite
important checks) in your driver. You should fix everything checkpatch
--strict reports.

> ---
>  drivers/media/platform/Kconfig                   |   1 +
>  drivers/media/platform/Makefile                  |   2 +
>  drivers/media/platform/sun6i-csi/Kconfig         |   9 +
>  drivers/media/platform/sun6i-csi/Makefile        |   3 +
>  drivers/media/platform/sun6i-csi/sun6i_csi.c     | 545 +++++++++++++++
>  drivers/media/platform/sun6i-csi/sun6i_csi.h     | 203 ++++++
>  drivers/media/platform/sun6i-csi/sun6i_csi_v3s.c | 827 +++++++++++++++++++++++
>  drivers/media/platform/sun6i-csi/sun6i_csi_v3s.h | 206 ++++++
>  drivers/media/platform/sun6i-csi/sun6i_video.c   | 663 ++++++++++++++++++
>  drivers/media/platform/sun6i-csi/sun6i_video.h   |  61 ++
>  10 files changed, 2520 insertions(+)
>  create mode 100644 drivers/media/platform/sun6i-csi/Kconfig
>  create mode 100644 drivers/media/platform/sun6i-csi/Makefile
>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi.c
>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi.h
>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi_v3s.c
>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi_v3s.h
>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_video.c
>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_video.h
> 
> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> index 0c741d1..8371a87 100644
> --- a/drivers/media/platform/Kconfig
> +++ b/drivers/media/platform/Kconfig
> @@ -143,6 +143,7 @@ source "drivers/media/platform/am437x/Kconfig"
>  source "drivers/media/platform/xilinx/Kconfig"
>  source "drivers/media/platform/rcar-vin/Kconfig"
>  source "drivers/media/platform/atmel/Kconfig"
> +source "drivers/media/platform/sun6i-csi/Kconfig"

We're going to have several different drivers in v4l eventually, so I
guess it would make sense to move to a directory of our own.

> +	dev_dbg(csi->dev, "creating links for entity %s\n", local->name);
> +
> +	while (1) {
> +		/* Get the next endpoint and parse its link. */
> +		next = of_graph_get_next_endpoint(entity->node, ep);
> +		if (next == NULL)
> +			break;
> +
> +		of_node_put(ep);
> +		ep = next;
> +
> +		dev_dbg(csi->dev, "processing endpoint %s\n", ep->full_name);
> +
> +		ret = v4l2_fwnode_parse_link(of_fwnode_handle(ep), &link);
> +		if (ret < 0) {
> +			dev_err(csi->dev, "failed to parse link for %s\n",
> +				ep->full_name);
> +			continue;
> +		}
> +
> +		/* Skip sink ports, they will be processed from the other end of
> +		 * the link.
> +		 */
> +		if (link.local_port >= local->num_pads) {
> +			dev_err(csi->dev, "invalid port number %u on %s\n",
> +				link.local_port,
> +				to_of_node(link.local_node)->full_name);
> +			v4l2_fwnode_put_link(&link);
> +			ret = -EINVAL;
> +			break;
> +		}
> +
> +		local_pad = &local->pads[link.local_port];
> +
> +		if (local_pad->flags & MEDIA_PAD_FL_SINK) {
> +			dev_dbg(csi->dev, "skipping sink port %s:%u\n",
> +				to_of_node(link.local_node)->full_name,
> +				link.local_port);
> +			v4l2_fwnode_put_link(&link);
> +			continue;
> +		}
> +
> +		/* Skip video node, they will be processed separately. */
> +		if (link.remote_node == of_fwnode_handle(csi->dev->of_node)) {
> +			dev_dbg(csi->dev, "skipping CSI port %s:%u\n",
> +				to_of_node(link.local_node)->full_name,
> +				link.local_port);
> +			v4l2_fwnode_put_link(&link);
> +			continue;
> +		}
> +
> +		/* Find the remote entity. */
> +		ent = sun6i_graph_find_entity(csi,
> +					      to_of_node(link.remote_node));
> +		if (ent == NULL) {
> +			dev_err(csi->dev, "no entity found for %s\n",
> +				to_of_node(link.remote_node)->full_name);
> +			v4l2_fwnode_put_link(&link);
> +			ret = -ENODEV;
> +			break;
> +		}
> +
> +		remote = ent->entity;
> +
> +		if (link.remote_port >= remote->num_pads) {
> +			dev_err(csi->dev, "invalid port number %u on %s\n",
> +				link.remote_port,
> +				to_of_node(link.remote_node)->full_name);
> +			v4l2_fwnode_put_link(&link);
> +			ret = -EINVAL;
> +			break;
> +		}
> +
> +		remote_pad = &remote->pads[link.remote_port];
> +
> +		v4l2_fwnode_put_link(&link);
> +
> +		/* Create the media link. */
> +		dev_dbg(csi->dev, "creating %s:%u -> %s:%u link\n",
> +			local->name, local_pad->index,
> +			remote->name, remote_pad->index);
> +
> +		ret = media_create_pad_link(local, local_pad->index,
> +					    remote, remote_pad->index,
> +					    link_flags);
> +		if (ret < 0) {
> +			dev_err(csi->dev,
> +				"failed to create %s:%u -> %s:%u link\n",
> +				local->name, local_pad->index,
> +				remote->name, remote_pad->index);
> +			break;
> +		}
> +	}

It's not really clear to me what you're trying to do here. Your
binding only states that it has a single port, with an endpoint to
your sensor.

Can't you just use of_graph_get_endpoint_by_regs(0, 0) ?

This will get you the endpoint you need, that you can parse later on
with v4l2_fwnode_endpoint_parse.

> +
> +	of_node_put(ep);
> +	return ret;
> +}
> +
> +static int sun6i_graph_build_video(struct sun6i_csi *csi)
> +{
> +	u32 link_flags = MEDIA_LNK_FL_ENABLED;
> +	struct device_node *node = csi->dev->of_node;
> +	struct media_entity *source;
> +	struct media_entity *sink;
> +	struct media_pad *source_pad;
> +	struct media_pad *sink_pad;
> +	struct sun6i_graph_entity *ent;
> +	struct v4l2_fwnode_link link;
> +	struct device_node *ep = NULL;
> +	struct device_node *next;
> +	struct sun6i_video *video = &csi->video;
> +	int ret = 0;
> +
> +	dev_dbg(csi->dev, "creating link for video node\n");
> +
> +	while (1) {
> +		/* Get the next endpoint and parse its link. */
> +		next = of_graph_get_next_endpoint(node, ep);
> +		if (next == NULL)
> +			break;
> +
> +		of_node_put(ep);
> +		ep = next;
> +
> +		dev_dbg(csi->dev, "processing endpoint %s\n", ep->full_name);
> +
> +		ret = v4l2_fwnode_parse_link(of_fwnode_handle(ep), &link);
> +		if (ret < 0) {
> +			dev_err(csi->dev, "failed to parse link for %s\n",
> +				ep->full_name);
> +			continue;
> +		}
> +
> +		/* Save the video port settings */
> +		ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep),
> +						 &csi->v4l2_ep);
> +		if (ret) {
> +			ret = -EINVAL;
> +			dev_err(csi->dev, "Could not parse the endpoint\n");
> +			v4l2_fwnode_put_link(&link);
> +			break;
> +		}
> +
> +		dev_dbg(csi->dev, "creating link for video node %s\n",
> +			video->vdev.name);
> +
> +		/* Find the remote entity. */
> +		ent = sun6i_graph_find_entity(csi,
> +					      to_of_node(link.remote_node));
> +		if (ent == NULL) {
> +			dev_err(csi->dev, "no entity found for %s\n",
> +				to_of_node(link.remote_node)->full_name);
> +			v4l2_fwnode_put_link(&link);
> +			ret = -ENODEV;
> +			break;
> +		}
> +
> +		if (link.remote_port >= ent->entity->num_pads) {
> +			dev_err(csi->dev, "invalid port number %u on %s\n",
> +				link.remote_port,
> +				to_of_node(link.remote_node)->full_name);
> +			v4l2_fwnode_put_link(&link);
> +			ret = -EINVAL;
> +			break;
> +		}
> +
> +		source = ent->entity;
> +		source_pad = &source->pads[link.remote_port];
> +		sink = &video->vdev.entity;
> +		sink_pad = &video->pad;
> +
> +		v4l2_fwnode_put_link(&link);
> +
> +		/* Create the media link. */
> +		dev_dbg(csi->dev, "creating %s:%u -> %s:%u link\n",
> +			source->name, source_pad->index,
> +			sink->name, sink_pad->index);
> +
> +		ret = media_create_pad_link(source, source_pad->index,
> +					    sink, sink_pad->index,
> +					    link_flags);
> +		if (ret < 0) {
> +			dev_err(csi->dev,
> +				"failed to create %s:%u -> %s:%u link\n",
> +				source->name, source_pad->index,
> +				sink->name, sink_pad->index);
> +			break;
> +		}
> +
> +		/* Notify video node */
> +		ret = media_entity_call(sink, link_setup, sink_pad, source_pad,
> +					link_flags);
> +		if (ret == -ENOIOCTLCMD)
> +			ret = 0;
> +
> +		/* found one */
> +		break;
> +	}
> +
> +	of_node_put(ep);
> +	return ret;
> +}
> +
> +static int sun6i_graph_notify_complete(struct v4l2_async_notifier *notifier)
> +{
> +	struct sun6i_csi *csi =
> +			container_of(notifier, struct sun6i_csi, notifier);
> +	struct sun6i_graph_entity *entity;
> +	int ret;
> +
> +	dev_dbg(csi->dev, "notify complete, all subdevs registered\n");
> +
> +	/* Create links for every entity. */
> +	list_for_each_entry(entity, &csi->entities, list) {
> +		ret = sun6i_graph_build_one(csi, entity);
> +		if (ret < 0)
> +			return ret;
> +	}
> +
> +	/* Create links for video node. */
> +	ret = sun6i_graph_build_video(csi);
> +	if (ret < 0)
> +		return ret;

Can you elaborate a bit on the difference between a node parsed with
_graph_build_one and _graph_build_video? Can't you just store the
remote sensor when you build the notifier, and reuse it here?

> +struct sun6i_csi_ops {
> +	int (*get_supported_pixformats)(struct sun6i_csi *csi,
> +					const u32 **pixformats);
> +	bool (*is_format_support)(struct sun6i_csi *csi, u32 pixformat,
> +				  u32 mbus_code);
> +	int (*s_power)(struct sun6i_csi *csi, bool enable);
> +	int (*update_config)(struct sun6i_csi *csi,
> +			     struct sun6i_csi_config *config);
> +	int (*update_buf_addr)(struct sun6i_csi *csi, dma_addr_t addr);
> +	int (*s_stream)(struct sun6i_csi *csi, bool enable);
> +};

Didn't we agreed on removing those in the first iteration? It's not
really clear at this point whether they will be needed at all. Make
something simple first, without those ops. When we'll support other
SoCs we'll have a better chance at seeing what and how we should deal
with potential quirks.

> +#ifdef DEBUG
> +static void sun6i_csi_dump_regs(struct sun6i_csi_dev *sdev)
> +{
> +	struct regmap *regmap = sdev->regmap;
> +	u32 val;
> +
> +	regmap_read(regmap, CSI_EN_REG, &val);
> +	printk("CSI_EN_REG=0x%x\n",		val);
> +	regmap_read(regmap, CSI_IF_CFG_REG, &val);
> +	printk("CSI_IF_CFG_REG=0x%x\n",		val);
> +	regmap_read(regmap, CSI_CAP_REG, &val);
> +	printk("CSI_CAP_REG=0x%x\n",		val);
> +	regmap_read(regmap, CSI_SYNC_CNT_REG, &val);
> +	printk("CSI_SYNC_CNT_REG=0x%x\n",	val);
> +	regmap_read(regmap, CSI_FIFO_THRS_REG, &val);
> +	printk("CSI_FIFO_THRS_REG=0x%x\n",	val);
> +	regmap_read(regmap, CSI_PTN_LEN_REG, &val);
> +	printk("CSI_PTN_LEN_REG=0x%x\n",	val);
> +	regmap_read(regmap, CSI_PTN_ADDR_REG, &val);
> +	printk("CSI_PTN_ADDR_REG=0x%x\n",	val);
> +	regmap_read(regmap, CSI_VER_REG, &val);
> +	printk("CSI_VER_REG=0x%x\n",		val);
> +	regmap_read(regmap, CSI_CH_CFG_REG, &val);
> +	printk("CSI_CH_CFG_REG=0x%x\n",		val);
> +	regmap_read(regmap, CSI_CH_SCALE_REG, &val);
> +	printk("CSI_CH_SCALE_REG=0x%x\n",	val);
> +	regmap_read(regmap, CSI_CH_F0_BUFA_REG, &val);
> +	printk("CSI_CH_F0_BUFA_REG=0x%x\n",	val);
> +	regmap_read(regmap, CSI_CH_F1_BUFA_REG, &val);
> +	printk("CSI_CH_F1_BUFA_REG=0x%x\n",	val);
> +	regmap_read(regmap, CSI_CH_F2_BUFA_REG, &val);
> +	printk("CSI_CH_F2_BUFA_REG=0x%x\n",	val);
> +	regmap_read(regmap, CSI_CH_STA_REG, &val);
> +	printk("CSI_CH_STA_REG=0x%x\n",		val);
> +	regmap_read(regmap, CSI_CH_INT_EN_REG, &val);
> +	printk("CSI_CH_INT_EN_REG=0x%x\n",	val);
> +	regmap_read(regmap, CSI_CH_INT_STA_REG, &val);
> +	printk("CSI_CH_INT_STA_REG=0x%x\n",	val);
> +	regmap_read(regmap, CSI_CH_FLD1_VSIZE_REG, &val);
> +	printk("CSI_CH_FLD1_VSIZE_REG=0x%x\n",	val);
> +	regmap_read(regmap, CSI_CH_HSIZE_REG, &val);
> +	printk("CSI_CH_HSIZE_REG=0x%x\n",	val);
> +	regmap_read(regmap, CSI_CH_VSIZE_REG, &val);
> +	printk("CSI_CH_VSIZE_REG=0x%x\n",	val);
> +	regmap_read(regmap, CSI_CH_BUF_LEN_REG, &val);
> +	printk("CSI_CH_BUF_LEN_REG=0x%x\n",	val);
> +	regmap_read(regmap, CSI_CH_FLIP_SIZE_REG, &val);
> +	printk("CSI_CH_FLIP_SIZE_REG=0x%x\n",	val);
> +	regmap_read(regmap, CSI_CH_FRM_CLK_CNT_REG, &val);
> +	printk("CSI_CH_FRM_CLK_CNT_REG=0x%x\n",	val);
> +	regmap_read(regmap, CSI_CH_ACC_ITNL_CLK_CNT_REG, &val);
> +	printk("CSI_CH_ACC_ITNL_CLK_CNT_REG=0x%x\n",	val);
> +	regmap_read(regmap, CSI_CH_FIFO_STAT_REG, &val);
> +	printk("CSI_CH_FIFO_STAT_REG=0x%x\n",	val);
> +	regmap_read(regmap, CSI_CH_PCLK_STAT_REG, &val);
> +	printk("CSI_CH_PCLK_STAT_REG=0x%x\n",	val);
> +}
> +#endif

You can already dump a regmap through debugfs, that's redundant.

> +
> +static void sun6i_csi_setup_bus(struct sun6i_csi_dev *sdev)
> +{
> +	struct v4l2_fwnode_endpoint *endpoint = &sdev->csi.v4l2_ep;
> +	unsigned char bus_width;
> +	u32 flags;
> +	u32 cfg;
> +
> +	bus_width = endpoint->bus.parallel.bus_width;
> +
> +	regmap_read(sdev->regmap, CSI_IF_CFG_REG, &cfg);
> +
> +	cfg &= ~(CSI_IF_CFG_CSI_IF_MASK | CSI_IF_CFG_MIPI_IF_MASK |
> +		 CSI_IF_CFG_IF_DATA_WIDTH_MASK |
> +		 CSI_IF_CFG_CLK_POL_MASK | CSI_IF_CFG_VREF_POL_MASK |
> +		 CSI_IF_CFG_HREF_POL_MASK | CSI_IF_CFG_FIELD_MASK);
> +
> +	switch (endpoint->bus_type) {
> +	case V4L2_MBUS_CSI2:
> +		cfg |= CSI_IF_CFG_MIPI_IF_MIPI;
> +		break;
> +	case V4L2_MBUS_PARALLEL:
> +		cfg |= CSI_IF_CFG_MIPI_IF_CSI;
> +
> +		flags = endpoint->bus.parallel.flags;
> +
> +		cfg |= (bus_width == 16) ? CSI_IF_CFG_CSI_IF_YUV422_16BIT :
> +					   CSI_IF_CFG_CSI_IF_YUV422_INTLV;
> +
> +		if (flags & V4L2_MBUS_FIELD_EVEN_LOW)
> +			cfg |= CSI_IF_CFG_FIELD_POSITIVE;
> +
> +		if (flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
> +			cfg |= CSI_IF_CFG_VREF_POL_POSITIVE;
> +		if (flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
> +			cfg |= CSI_IF_CFG_HREF_POL_POSITIVE;
> +
> +		if (flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
> +			cfg |= CSI_IF_CFG_CLK_POL_FALLING_EDGE;
> +		break;
> +	case V4L2_MBUS_BT656:
> +		cfg |= CSI_IF_CFG_MIPI_IF_CSI;
> +
> +		flags = endpoint->bus.parallel.flags;
> +
> +		cfg |= (bus_width == 16) ? CSI_IF_CFG_CSI_IF_BT1120 :
> +					   CSI_IF_CFG_CSI_IF_BT656;
> +
> +		if (flags & V4L2_MBUS_FIELD_EVEN_LOW)
> +			cfg |= CSI_IF_CFG_FIELD_POSITIVE;
> +
> +		if (flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
> +			cfg |= CSI_IF_CFG_CLK_POL_FALLING_EDGE;
> +		break;
> +	default:
> +		BUG();

BUG() will generate a kernel panic, which seems a bit too extreme :)
How about a warning instead?

> +static int set_power(struct sun6i_csi *csi, bool enable)
> +{
> +	struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> +	struct regmap *regmap = sdev->regmap;
> +	int ret;
> +
> +	if (!enable) {
> +		regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, 0);
> +
> +		clk_disable_unprepare(sdev->clk_ram);
> +		clk_disable_unprepare(sdev->clk_mod);
> +		clk_disable_unprepare(sdev->clk_ahb);
> +		reset_control_assert(sdev->rstc_ahb);
> +		return 0;
> +	}
> +
> +	ret = clk_prepare_enable(sdev->clk_ahb);
> +	if (ret) {
> +		dev_err(sdev->dev, "Enable ahb clk err %d\n", ret);
> +		return ret;
> +	}

The ahb clock doesn't need to be running all the time, at least since
the SoCs that have a reset line for every
controller. regmap_init_mmio_clk will take care of enabling it only
when you access the registers, which is what you need.

> +	ret = clk_prepare_enable(sdev->clk_mod);
> +	if (ret) {
> +		dev_err(sdev->dev, "Enable csi clk err %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = clk_prepare_enable(sdev->clk_ram);
> +	if (ret) {
> +		dev_err(sdev->dev, "Enable clk_dram_csi clk err %d\n", ret);
> +		return ret;
> +	}
> +
> +	if (!IS_ERR_OR_NULL(sdev->rstc_ahb)) {

A missing reset line should not be allowed to probe, just like the
clocks aren't, so this condition should never fail (and therefore is
basically useless).

> +		ret = reset_control_deassert(sdev->rstc_ahb);
> +		if (ret) {
> +			dev_err(sdev->dev, "reset err %d\n", ret);
> +			return ret;
> +		}
> +	}
> +
> +	regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, CSI_EN_CSI_EN);
> +
> +	return 0;
> +}
> +
> +static int update_config(struct sun6i_csi *csi,
> +			 struct sun6i_csi_config *config)
> +{
> +	struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> +
> +	if (config == NULL)
> +		return -EINVAL;
> +
> +	memcpy(&csi->config, config, sizeof(csi->config));
> +
> +	sun6i_csi_setup_bus(sdev);
> +	sun6i_csi_set_format(sdev);
> +	sun6i_csi_set_window(sdev);
> +
> +	return 0;
> +}
> +
> +static int update_buf_addr(struct sun6i_csi *csi, dma_addr_t addr)
> +{
> +	struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> +	/* transform physical address to bus address */
> +	dma_addr_t bus_addr = addr - 0x40000000;

Like Baruch noticed, you should use PHYS_OFFSET here. The A80 for
example has a different RAM base address.

> +
> +	regmap_write(sdev->regmap, CSI_CH_F0_BUFA_REG,
> +		     (bus_addr + sdev->planar_offset[0]) >> 2);
> +	if (sdev->planar_offset[1] != -1)
> +		regmap_write(sdev->regmap, CSI_CH_F1_BUFA_REG,
> +			     (bus_addr + sdev->planar_offset[1]) >> 2);
> +	if (sdev->planar_offset[2] != -1)
> +		regmap_write(sdev->regmap, CSI_CH_F2_BUFA_REG,
> +			     (bus_addr + sdev->planar_offset[2]) >> 2);
> +
> +	return 0;
> +}
> +
> +static int set_stream(struct sun6i_csi *csi, bool enable)
> +{
> +	struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> +	struct regmap *regmap = sdev->regmap;
> +
> +	if (!enable) {
> +		regmap_update_bits(regmap, CSI_CAP_REG, CSI_CAP_CH0_VCAP_ON, 0);
> +		regmap_write(regmap, CSI_CH_INT_EN_REG, 0);
> +		return 0;
> +	}
> +
> +	regmap_write(regmap, CSI_CH_INT_STA_REG, 0xFF);
> +	regmap_write(regmap, CSI_CH_INT_EN_REG,
> +		     CSI_CH_INT_EN_HB_OF_INT_EN |
> +		     CSI_CH_INT_EN_FIFO2_OF_INT_EN |
> +		     CSI_CH_INT_EN_FIFO1_OF_INT_EN |
> +		     CSI_CH_INT_EN_FIFO0_OF_INT_EN |
> +		     CSI_CH_INT_EN_FD_INT_EN |
> +		     CSI_CH_INT_EN_CD_INT_EN);
> +
> +	regmap_update_bits(regmap, CSI_CAP_REG, CSI_CAP_CH0_VCAP_ON,
> +			   CSI_CAP_CH0_VCAP_ON);
> +
> +	return 0;
> +}
> +
> +static struct sun6i_csi_ops csi_ops = {
> +	.get_supported_pixformats	= get_supported_pixformats,
> +	.is_format_support		= is_format_support,
> +	.s_power			= set_power,
> +	.update_config			= update_config,
> +	.update_buf_addr		= update_buf_addr,
> +	.s_stream			= set_stream,
> +};
> +
> +static irqreturn_t sun6i_csi_isr(int irq, void *dev_id)
> +{
> +	struct sun6i_csi_dev *sdev = (struct sun6i_csi_dev *)dev_id;
> +	struct regmap *regmap = sdev->regmap;
> +	u32 status;
> +
> +	regmap_read(regmap, CSI_CH_INT_STA_REG, &status);
> +
> +	if ((status & CSI_CH_INT_STA_FIFO0_OF_PD) ||
> +	    (status & CSI_CH_INT_STA_FIFO1_OF_PD) ||
> +	    (status & CSI_CH_INT_STA_FIFO2_OF_PD) ||
> +	    (status & CSI_CH_INT_STA_HB_OF_PD)) {
> +		regmap_write(regmap, CSI_CH_INT_STA_REG, status);
> +		regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, 0);
> +		regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN,
> +				   CSI_EN_CSI_EN);

You need to enable / disable it at every frame? How do you deal with
double buffering? (or did you choose to ignore it for now?)

> +		return IRQ_HANDLED;
> +	}
> +
> +	if (status & CSI_CH_INT_STA_FD_PD) {
> +		sun6i_video_frame_done(&sdev->csi.video);
> +	}
> +
> +	regmap_write(regmap, CSI_CH_INT_STA_REG, status);

Isn't it redundant with the one you did in the condition a bit above?

You should also check that your device indeed generated an
interrupt. In the occurence of a spourious interrupt, your code will
return IRQ_HANDLED, which is the wrong thing to do.

I think you should reverse your logic a bit here to make this
easier. You should just check that your status flags are indeed set,
and if not just bail out and return IRQ_NONE.

And if they are, go on with treating your interrupt.

> +
> +	return IRQ_HANDLED;
> +}
> +
> +static const struct regmap_config sun6i_csi_regmap_config = {
> +	.reg_bits       = 32,
> +	.reg_stride     = 4,
> +	.val_bits       = 32,
> +	.max_register	= 0x1000,
> +};
> +
> +static int sun6i_csi_resource_request(struct sun6i_csi_dev *sdev,
> +				      struct platform_device *pdev)
> +{
> +	struct resource *res;
> +	void __iomem *io_base;
> +	int ret;
> +	int irq;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	io_base = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(io_base))
> +		return PTR_ERR(io_base);
> +
> +	sdev->regmap = devm_regmap_init_mmio(&pdev->dev, io_base,
> +					    &sun6i_csi_regmap_config);
> +	if (IS_ERR(sdev->regmap)) {
> +		dev_err(&pdev->dev, "Failed to init register map\n");
> +		return PTR_ERR(sdev->regmap);
> +	}
> +
> +	sdev->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
> +	if (IS_ERR(sdev->clk_ahb)) {
> +		dev_err(&pdev->dev, "Unable to acquire ahb clock\n");
> +		return PTR_ERR(sdev->clk_ahb);
> +	}
> +	sdev->clk_mod = devm_clk_get(&pdev->dev, "mod");
> +	if (IS_ERR(sdev->clk_mod)) {
> +		dev_err(&pdev->dev, "Unable to acquire csi clock\n");
> +		return PTR_ERR(sdev->clk_mod);
> +	}
> +
> +	sdev->clk_ram = devm_clk_get(&pdev->dev, "ram");
> +	if (IS_ERR(sdev->clk_ram)) {
> +		dev_err(&pdev->dev, "Unable to acquire dram-csi clock\n");
> +		return PTR_ERR(sdev->clk_ram);
> +	}
> +
> +	sdev->rstc_ahb = devm_reset_control_get_optional_shared(&pdev->dev, NULL);

It is not optional, the reset line is always going to be there (at
least on the SoCs that have been out so far), and a missing reset line
in the DT must be reported as an error, since the device will not be
able to operate properly.

Thanks!
Maxime

Baruch Siach July 30, 2017, 6:08 a.m. UTC | #4

Hi Maxime, Yong,

On Fri, Jul 28, 2017 at 06:02:33PM +0200, Maxime Ripard wrote:
> Hi, 
> 
> Thanks for the second iteration!
> 
> On Thu, Jul 27, 2017 at 01:01:35PM +0800, Yong Deng wrote:
> > Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> > and CSI1 is used for parallel interface. This is not documented in
> > datasheet but by testing and guess.
> > 
> > This patch implement a v4l2 framework driver for it.
> > 
> > Currently, the driver only support the parallel interface. MIPI-CSI2,
> > ISP's support are not included in this patch.
> > 
> > Signed-off-by: Yong Deng <[e-mail]>

[...]

> > +#ifdef DEBUG
> > +static void sun6i_csi_dump_regs(struct sun6i_csi_dev *sdev)
> > +{
> > +	struct regmap *regmap = sdev->regmap;
> > +	u32 val;
> > +
> > +	regmap_read(regmap, CSI_EN_REG, &val);
> > +	printk("CSI_EN_REG=0x%x\n",		val);
> > +	regmap_read(regmap, CSI_IF_CFG_REG, &val);
> > +	printk("CSI_IF_CFG_REG=0x%x\n",		val);
> > +	regmap_read(regmap, CSI_CAP_REG, &val);
> > +	printk("CSI_CAP_REG=0x%x\n",		val);
> > +	regmap_read(regmap, CSI_SYNC_CNT_REG, &val);
> > +	printk("CSI_SYNC_CNT_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_FIFO_THRS_REG, &val);
> > +	printk("CSI_FIFO_THRS_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_PTN_LEN_REG, &val);
> > +	printk("CSI_PTN_LEN_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_PTN_ADDR_REG, &val);
> > +	printk("CSI_PTN_ADDR_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_VER_REG, &val);
> > +	printk("CSI_VER_REG=0x%x\n",		val);
> > +	regmap_read(regmap, CSI_CH_CFG_REG, &val);
> > +	printk("CSI_CH_CFG_REG=0x%x\n",		val);
> > +	regmap_read(regmap, CSI_CH_SCALE_REG, &val);
> > +	printk("CSI_CH_SCALE_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_F0_BUFA_REG, &val);
> > +	printk("CSI_CH_F0_BUFA_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_F1_BUFA_REG, &val);
> > +	printk("CSI_CH_F1_BUFA_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_F2_BUFA_REG, &val);
> > +	printk("CSI_CH_F2_BUFA_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_STA_REG, &val);
> > +	printk("CSI_CH_STA_REG=0x%x\n",		val);
> > +	regmap_read(regmap, CSI_CH_INT_EN_REG, &val);
> > +	printk("CSI_CH_INT_EN_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_INT_STA_REG, &val);
> > +	printk("CSI_CH_INT_STA_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_FLD1_VSIZE_REG, &val);
> > +	printk("CSI_CH_FLD1_VSIZE_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_HSIZE_REG, &val);
> > +	printk("CSI_CH_HSIZE_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_VSIZE_REG, &val);
> > +	printk("CSI_CH_VSIZE_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_BUF_LEN_REG, &val);
> > +	printk("CSI_CH_BUF_LEN_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_FLIP_SIZE_REG, &val);
> > +	printk("CSI_CH_FLIP_SIZE_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_FRM_CLK_CNT_REG, &val);
> > +	printk("CSI_CH_FRM_CLK_CNT_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_ACC_ITNL_CLK_CNT_REG, &val);
> > +	printk("CSI_CH_ACC_ITNL_CLK_CNT_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_FIFO_STAT_REG, &val);
> > +	printk("CSI_CH_FIFO_STAT_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_PCLK_STAT_REG, &val);
> > +	printk("CSI_CH_PCLK_STAT_REG=0x%x\n",	val);
> > +}
> > +#endif
> 
> You can already dump a regmap through debugfs, that's redundant.

The advantage of in-code registers dump routine is the ability to synchronize 
the snapshot with the driver code execution. This is particularly important 
for the capture statistics registers. I have found it useful here.

[...]

> > +static int update_buf_addr(struct sun6i_csi *csi, dma_addr_t addr)
> > +{
> > +	struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> > +	/* transform physical address to bus address */
> > +	dma_addr_t bus_addr = addr - 0x40000000;
> 
> Like Baruch noticed, you should use PHYS_OFFSET here. The A80 for
> example has a different RAM base address.
> 
> > +
> > +	regmap_write(sdev->regmap, CSI_CH_F0_BUFA_REG,
> > +		     (bus_addr + sdev->planar_offset[0]) >> 2);

Why do you need the bit shift? Does that work for you?

The User Manuals of both the V3s and the and the A33 (AKA R16) state that the 
BUFA field size in this register is 31:00, that is 32bit. I have found no 
indication of this bit shift in the Olimex provided sunxi-vfe[1] driver. On 
the A33 I have found that only after removing the bit-shift, (some sort of) 
data started to appear in the buffer.

[1] https://github.com/hehopmajieh/a33_linux/tree/master/drivers/media/video/sunxi-vfe

[...]

> > +static irqreturn_t sun6i_csi_isr(int irq, void *dev_id)
> > +{
> > +	struct sun6i_csi_dev *sdev = (struct sun6i_csi_dev *)dev_id;
> > +	struct regmap *regmap = sdev->regmap;
> > +	u32 status;
> > +
> > +	regmap_read(regmap, CSI_CH_INT_STA_REG, &status);
> > +
> > +	if ((status & CSI_CH_INT_STA_FIFO0_OF_PD) ||
> > +	    (status & CSI_CH_INT_STA_FIFO1_OF_PD) ||
> > +	    (status & CSI_CH_INT_STA_FIFO2_OF_PD) ||
> > +	    (status & CSI_CH_INT_STA_HB_OF_PD)) {
> > +		regmap_write(regmap, CSI_CH_INT_STA_REG, status);
> > +		regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, 0);
> > +		regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN,
> > +				   CSI_EN_CSI_EN);
> 
> You need to enable / disable it at every frame? How do you deal with
> double buffering? (or did you choose to ignore it for now?)

These *_OF_PD status bits indicate an overflow error condition.

> > +		return IRQ_HANDLED;
> > +	}
> > +
> > +	if (status & CSI_CH_INT_STA_FD_PD) {
> > +		sun6i_video_frame_done(&sdev->csi.video);
> > +	}
> > +
> > +	regmap_write(regmap, CSI_CH_INT_STA_REG, status);
> 
> Isn't it redundant with the one you did in the condition a bit above?
> 
> You should also check that your device indeed generated an
> interrupt. In the occurence of a spourious interrupt, your code will
> return IRQ_HANDLED, which is the wrong thing to do.
> 
> I think you should reverse your logic a bit here to make this
> easier. You should just check that your status flags are indeed set,
> and if not just bail out and return IRQ_NONE.
> 
> And if they are, go on with treating your interrupt.
> 
> > +
> > +	return IRQ_HANDLED;
> > +}

baruch

yong July 31, 2017, 12:47 a.m. UTC | #5

On Thu, 27 Jul 2017 14:25:51 +0200
Maxime Ripard <[e-mail]> wrote:

> On Thu, Jul 27, 2017 at 03:16:44PM +0300, Baruch Siach wrote:
> > Hi Yong,
> > 
> > I managed to get the Frame Done interrupt with the previous version of this 
> > driver on the A33 OLinuXino. No data yet (all zeros). I'm still working on it.
> > 
> > One comment below.
> > 
> > On Thu, Jul 27, 2017 at 01:01:35PM +0800, Yong Deng wrote:
> > > Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> > > and CSI1 is used for parallel interface. This is not documented in
> > > datasheet but by testing and guess.
> > > 
> > > This patch implement a v4l2 framework driver for it.
> > > 
> > > Currently, the driver only support the parallel interface. MIPI-CSI2,
> > > ISP's support are not included in this patch.
> > > 
> > > Signed-off-by: Yong Deng <[e-mail]>
> > > ---
> > 
> > [...]
> > 
> > > +static int update_buf_addr(struct sun6i_csi *csi, dma_addr_t addr)
> > > +{
> > > +	struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> > > +	/* transform physical address to bus address */
> > > +	dma_addr_t bus_addr = addr - 0x40000000;
> > 
> > What is the source of this magic number? Is it platform dependent? Are there 
> > other devices doing DMA that need this adjustment?
> 
> This is the RAM base address in most (but not all) Allwinner
> SoCs. You'll want to use PHYS_OFFSET instead.

I have try to use PHYS_OFFSET. But I found it is not 0x40000000. I will
try it again.

> 
> Maxime
> 
> -- 
> Maxime Ripard, Free Electrons
> Embedded Linux and Kernel engineering
> http://free-electrons.com


Thanks,
Yong

yong July 31, 2017, 1:48 a.m. UTC | #6

Hi,

On Sun, 30 Jul 2017 09:08:01 +0300
Baruch Siach <[e-mail]> wrote:

> Hi Maxime, Yong,
> 
> On Fri, Jul 28, 2017 at 06:02:33PM +0200, Maxime Ripard wrote:
> > Hi, 
> > 
> > Thanks for the second iteration!
> > 
> > On Thu, Jul 27, 2017 at 01:01:35PM +0800, Yong Deng wrote:
> > > Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> > > and CSI1 is used for parallel interface. This is not documented in
> > > datasheet but by testing and guess.
> > > 
> > > This patch implement a v4l2 framework driver for it.
> > > 
> > > Currently, the driver only support the parallel interface. MIPI-CSI2,
> > > ISP's support are not included in this patch.
> > > 
> > > Signed-off-by: Yong Deng <[e-mail]>
> 
> [...]
> 
> > > +#ifdef DEBUG
> > > +static void sun6i_csi_dump_regs(struct sun6i_csi_dev *sdev)
> > > +{
> > > +	struct regmap *regmap = sdev->regmap;
> > > +	u32 val;
> > > +
> > > +	regmap_read(regmap, CSI_EN_REG, &val);
> > > +	printk("CSI_EN_REG=0x%x\n",		val);
> > > +	regmap_read(regmap, CSI_IF_CFG_REG, &val);
> > > +	printk("CSI_IF_CFG_REG=0x%x\n",		val);
> > > +	regmap_read(regmap, CSI_CAP_REG, &val);
> > > +	printk("CSI_CAP_REG=0x%x\n",		val);
> > > +	regmap_read(regmap, CSI_SYNC_CNT_REG, &val);
> > > +	printk("CSI_SYNC_CNT_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_FIFO_THRS_REG, &val);
> > > +	printk("CSI_FIFO_THRS_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_PTN_LEN_REG, &val);
> > > +	printk("CSI_PTN_LEN_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_PTN_ADDR_REG, &val);
> > > +	printk("CSI_PTN_ADDR_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_VER_REG, &val);
> > > +	printk("CSI_VER_REG=0x%x\n",		val);
> > > +	regmap_read(regmap, CSI_CH_CFG_REG, &val);
> > > +	printk("CSI_CH_CFG_REG=0x%x\n",		val);
> > > +	regmap_read(regmap, CSI_CH_SCALE_REG, &val);
> > > +	printk("CSI_CH_SCALE_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_F0_BUFA_REG, &val);
> > > +	printk("CSI_CH_F0_BUFA_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_F1_BUFA_REG, &val);
> > > +	printk("CSI_CH_F1_BUFA_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_F2_BUFA_REG, &val);
> > > +	printk("CSI_CH_F2_BUFA_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_STA_REG, &val);
> > > +	printk("CSI_CH_STA_REG=0x%x\n",		val);
> > > +	regmap_read(regmap, CSI_CH_INT_EN_REG, &val);
> > > +	printk("CSI_CH_INT_EN_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_INT_STA_REG, &val);
> > > +	printk("CSI_CH_INT_STA_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_FLD1_VSIZE_REG, &val);
> > > +	printk("CSI_CH_FLD1_VSIZE_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_HSIZE_REG, &val);
> > > +	printk("CSI_CH_HSIZE_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_VSIZE_REG, &val);
> > > +	printk("CSI_CH_VSIZE_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_BUF_LEN_REG, &val);
> > > +	printk("CSI_CH_BUF_LEN_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_FLIP_SIZE_REG, &val);
> > > +	printk("CSI_CH_FLIP_SIZE_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_FRM_CLK_CNT_REG, &val);
> > > +	printk("CSI_CH_FRM_CLK_CNT_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_ACC_ITNL_CLK_CNT_REG, &val);
> > > +	printk("CSI_CH_ACC_ITNL_CLK_CNT_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_FIFO_STAT_REG, &val);
> > > +	printk("CSI_CH_FIFO_STAT_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_PCLK_STAT_REG, &val);
> > > +	printk("CSI_CH_PCLK_STAT_REG=0x%x\n",	val);
> > > +}
> > > +#endif
> > 
> > You can already dump a regmap through debugfs, that's redundant.
> 
> The advantage of in-code registers dump routine is the ability to synchronize 
> the snapshot with the driver code execution. This is particularly important 
> for the capture statistics registers. I have found it useful here.

Agree. It is not used to expose the registers value to user space. If you
think it is redundant, I will delete it.

> 
> [...]
> 
> > > +static int update_buf_addr(struct sun6i_csi *csi, dma_addr_t addr)
> > > +{
> > > +	struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> > > +	/* transform physical address to bus address */
> > > +	dma_addr_t bus_addr = addr - 0x40000000;
> > 
> > Like Baruch noticed, you should use PHYS_OFFSET here. The A80 for
> > example has a different RAM base address.
> > 
> > > +
> > > +	regmap_write(sdev->regmap, CSI_CH_F0_BUFA_REG,
> > > +		     (bus_addr + sdev->planar_offset[0]) >> 2);
> 
> Why do you need the bit shift? Does that work for you?
> 
> The User Manuals of both the V3s and the and the A33 (AKA R16) state that the 
> BUFA field size in this register is 31:00, that is 32bit. I have found no 
> indication of this bit shift in the Olimex provided sunxi-vfe[1] driver. On 
> the A33 I have found that only after removing the bit-shift, (some sort of) 
> data started to appear in the buffer.
> 
> [1] https://github.com/hehopmajieh/a33_linux/tree/master/drivers/media/video/sunxi-vfe
> 

The Users Manuals do not document this bit shift. You should see line 10 to
32 in https://github.com/hehopmajieh/a33_linux/blob/master/drivers/media/video/sunxi-vfe/csi/csi_reg.c

> [...]
> 
> > > +static irqreturn_t sun6i_csi_isr(int irq, void *dev_id)
> > > +{
> > > +	struct sun6i_csi_dev *sdev = (struct sun6i_csi_dev *)dev_id;
> > > +	struct regmap *regmap = sdev->regmap;
> > > +	u32 status;
> > > +
> > > +	regmap_read(regmap, CSI_CH_INT_STA_REG, &status);
> > > +
> > > +	if ((status & CSI_CH_INT_STA_FIFO0_OF_PD) ||
> > > +	    (status & CSI_CH_INT_STA_FIFO1_OF_PD) ||
> > > +	    (status & CSI_CH_INT_STA_FIFO2_OF_PD) ||
> > > +	    (status & CSI_CH_INT_STA_HB_OF_PD)) {
> > > +		regmap_write(regmap, CSI_CH_INT_STA_REG, status);
> > > +		regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, 0);
> > > +		regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN,
> > > +				   CSI_EN_CSI_EN);
> > 
> > You need to enable / disable it at every frame? How do you deal with
> > double buffering? (or did you choose to ignore it for now?)
> 
> These *_OF_PD status bits indicate an overflow error condition.

Right.

> 
> > > +		return IRQ_HANDLED;
> > > +	}
> > > +
> > > +	if (status & CSI_CH_INT_STA_FD_PD) {
> > > +		sun6i_video_frame_done(&sdev->csi.video);
> > > +	}
> > > +
> > > +	regmap_write(regmap, CSI_CH_INT_STA_REG, status);
> > 
> > Isn't it redundant with the one you did in the condition a bit above?
> > 
> > You should also check that your device indeed generated an
> > interrupt. In the occurence of a spourious interrupt, your code will
> > return IRQ_HANDLED, which is the wrong thing to do.
> > 
> > I think you should reverse your logic a bit here to make this
> > easier. You should just check that your status flags are indeed set,
> > and if not just bail out and return IRQ_NONE.
> > 
> > And if they are, go on with treating your interrupt.
> > 
> > > +
> > > +	return IRQ_HANDLED;
> > > +}
> 
> baruch
> 
> -- 
>      http://baruch.siach.name/blog/                  ~. .~   Tk Open Systems
> =}------------------------------------------------ooO--U--Ooo------------{=
>    - [e-mail] - tel: [phone], http://www.tkos.co.il -


Thanks,
Yong

yong July 31, 2017, 3:16 a.m. UTC | #7

Hi,

On Fri, 28 Jul 2017 18:02:33 +0200
Maxime Ripard <[e-mail]> wrote:

> Hi, 
> 
> Thanks for the second iteration!
> 
> On Thu, Jul 27, 2017 at 01:01:35PM +0800, Yong Deng wrote:
> > Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> > and CSI1 is used for parallel interface. This is not documented in
> > datasheet but by testing and guess.
> > 
> > This patch implement a v4l2 framework driver for it.
> > 
> > Currently, the driver only support the parallel interface. MIPI-CSI2,
> > ISP's support are not included in this patch.
> > 
> > Signed-off-by: Yong Deng <[e-mail]>
> 
> There's a significant amount of checkpatch warnings (and quite
> important checks) in your driver. You should fix everything checkpatch
> --strict reports.

OK. I will check and fix.

> 
> > ---
> >  drivers/media/platform/Kconfig                   |   1 +
> >  drivers/media/platform/Makefile                  |   2 +
> >  drivers/media/platform/sun6i-csi/Kconfig         |   9 +
> >  drivers/media/platform/sun6i-csi/Makefile        |   3 +
> >  drivers/media/platform/sun6i-csi/sun6i_csi.c     | 545 +++++++++++++++
> >  drivers/media/platform/sun6i-csi/sun6i_csi.h     | 203 ++++++
> >  drivers/media/platform/sun6i-csi/sun6i_csi_v3s.c | 827 +++++++++++++++++++++++
> >  drivers/media/platform/sun6i-csi/sun6i_csi_v3s.h | 206 ++++++
> >  drivers/media/platform/sun6i-csi/sun6i_video.c   | 663 ++++++++++++++++++
> >  drivers/media/platform/sun6i-csi/sun6i_video.h   |  61 ++
> >  10 files changed, 2520 insertions(+)
> >  create mode 100644 drivers/media/platform/sun6i-csi/Kconfig
> >  create mode 100644 drivers/media/platform/sun6i-csi/Makefile
> >  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi.c
> >  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi.h
> >  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi_v3s.c
> >  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi_v3s.h
> >  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_video.c
> >  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_video.h
> > 
> > diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> > index 0c741d1..8371a87 100644
> > --- a/drivers/media/platform/Kconfig
> > +++ b/drivers/media/platform/Kconfig
> > @@ -143,6 +143,7 @@ source "drivers/media/platform/am437x/Kconfig"
> >  source "drivers/media/platform/xilinx/Kconfig"
> >  source "drivers/media/platform/rcar-vin/Kconfig"
> >  source "drivers/media/platform/atmel/Kconfig"
> > +source "drivers/media/platform/sun6i-csi/Kconfig"
> 
> We're going to have several different drivers in v4l eventually, so I
> guess it would make sense to move to a directory of our own.

Like this?
drivers/media/platform/sunxi/sun6i-csi

> 
> > +	dev_dbg(csi->dev, "creating links for entity %s\n", local->name);
> > +
> > +	while (1) {
> > +		/* Get the next endpoint and parse its link. */
> > +		next = of_graph_get_next_endpoint(entity->node, ep);
> > +		if (next == NULL)
> > +			break;
> > +
> > +		of_node_put(ep);
> > +		ep = next;
> > +
> > +		dev_dbg(csi->dev, "processing endpoint %s\n", ep->full_name);
> > +
> > +		ret = v4l2_fwnode_parse_link(of_fwnode_handle(ep), &link);
> > +		if (ret < 0) {
> > +			dev_err(csi->dev, "failed to parse link for %s\n",
> > +				ep->full_name);
> > +			continue;
> > +		}
> > +
> > +		/* Skip sink ports, they will be processed from the other end of
> > +		 * the link.
> > +		 */
> > +		if (link.local_port >= local->num_pads) {
> > +			dev_err(csi->dev, "invalid port number %u on %s\n",
> > +				link.local_port,
> > +				to_of_node(link.local_node)->full_name);
> > +			v4l2_fwnode_put_link(&link);
> > +			ret = -EINVAL;
> > +			break;
> > +		}
> > +
> > +		local_pad = &local->pads[link.local_port];
> > +
> > +		if (local_pad->flags & MEDIA_PAD_FL_SINK) {
> > +			dev_dbg(csi->dev, "skipping sink port %s:%u\n",
> > +				to_of_node(link.local_node)->full_name,
> > +				link.local_port);
> > +			v4l2_fwnode_put_link(&link);
> > +			continue;
> > +		}
> > +
> > +		/* Skip video node, they will be processed separately. */
> > +		if (link.remote_node == of_fwnode_handle(csi->dev->of_node)) {
> > +			dev_dbg(csi->dev, "skipping CSI port %s:%u\n",
> > +				to_of_node(link.local_node)->full_name,
> > +				link.local_port);
> > +			v4l2_fwnode_put_link(&link);
> > +			continue;
> > +		}
> > +
> > +		/* Find the remote entity. */
> > +		ent = sun6i_graph_find_entity(csi,
> > +					      to_of_node(link.remote_node));
> > +		if (ent == NULL) {
> > +			dev_err(csi->dev, "no entity found for %s\n",
> > +				to_of_node(link.remote_node)->full_name);
> > +			v4l2_fwnode_put_link(&link);
> > +			ret = -ENODEV;
> > +			break;
> > +		}
> > +
> > +		remote = ent->entity;
> > +
> > +		if (link.remote_port >= remote->num_pads) {
> > +			dev_err(csi->dev, "invalid port number %u on %s\n",
> > +				link.remote_port,
> > +				to_of_node(link.remote_node)->full_name);
> > +			v4l2_fwnode_put_link(&link);
> > +			ret = -EINVAL;
> > +			break;
> > +		}
> > +
> > +		remote_pad = &remote->pads[link.remote_port];
> > +
> > +		v4l2_fwnode_put_link(&link);
> > +
> > +		/* Create the media link. */
> > +		dev_dbg(csi->dev, "creating %s:%u -> %s:%u link\n",
> > +			local->name, local_pad->index,
> > +			remote->name, remote_pad->index);
> > +
> > +		ret = media_create_pad_link(local, local_pad->index,
> > +					    remote, remote_pad->index,
> > +					    link_flags);
> > +		if (ret < 0) {
> > +			dev_err(csi->dev,
> > +				"failed to create %s:%u -> %s:%u link\n",
> > +				local->name, local_pad->index,
> > +				remote->name, remote_pad->index);
> > +			break;
> > +		}
> > +	}
> 
> It's not really clear to me what you're trying to do here. Your
> binding only states that it has a single port, with an endpoint to
> your sensor.
> 
> Can't you just use of_graph_get_endpoint_by_regs(0, 0) ?
> 
> This will get you the endpoint you need, that you can parse later on
> with v4l2_fwnode_endpoint_parse.

See below.

> 
> > +
> > +	of_node_put(ep);
> > +	return ret;
> > +}
> > +
> > +static int sun6i_graph_build_video(struct sun6i_csi *csi)
> > +{
> > +	u32 link_flags = MEDIA_LNK_FL_ENABLED;
> > +	struct device_node *node = csi->dev->of_node;
> > +	struct media_entity *source;
> > +	struct media_entity *sink;
> > +	struct media_pad *source_pad;
> > +	struct media_pad *sink_pad;
> > +	struct sun6i_graph_entity *ent;
> > +	struct v4l2_fwnode_link link;
> > +	struct device_node *ep = NULL;
> > +	struct device_node *next;
> > +	struct sun6i_video *video = &csi->video;
> > +	int ret = 0;
> > +
> > +	dev_dbg(csi->dev, "creating link for video node\n");
> > +
> > +	while (1) {
> > +		/* Get the next endpoint and parse its link. */
> > +		next = of_graph_get_next_endpoint(node, ep);
> > +		if (next == NULL)
> > +			break;
> > +
> > +		of_node_put(ep);
> > +		ep = next;
> > +
> > +		dev_dbg(csi->dev, "processing endpoint %s\n", ep->full_name);
> > +
> > +		ret = v4l2_fwnode_parse_link(of_fwnode_handle(ep), &link);
> > +		if (ret < 0) {
> > +			dev_err(csi->dev, "failed to parse link for %s\n",
> > +				ep->full_name);
> > +			continue;
> > +		}
> > +
> > +		/* Save the video port settings */
> > +		ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep),
> > +						 &csi->v4l2_ep);
> > +		if (ret) {
> > +			ret = -EINVAL;
> > +			dev_err(csi->dev, "Could not parse the endpoint\n");
> > +			v4l2_fwnode_put_link(&link);
> > +			break;
> > +		}
> > +
> > +		dev_dbg(csi->dev, "creating link for video node %s\n",
> > +			video->vdev.name);
> > +
> > +		/* Find the remote entity. */
> > +		ent = sun6i_graph_find_entity(csi,
> > +					      to_of_node(link.remote_node));
> > +		if (ent == NULL) {
> > +			dev_err(csi->dev, "no entity found for %s\n",
> > +				to_of_node(link.remote_node)->full_name);
> > +			v4l2_fwnode_put_link(&link);
> > +			ret = -ENODEV;
> > +			break;
> > +		}
> > +
> > +		if (link.remote_port >= ent->entity->num_pads) {
> > +			dev_err(csi->dev, "invalid port number %u on %s\n",
> > +				link.remote_port,
> > +				to_of_node(link.remote_node)->full_name);
> > +			v4l2_fwnode_put_link(&link);
> > +			ret = -EINVAL;
> > +			break;
> > +		}
> > +
> > +		source = ent->entity;
> > +		source_pad = &source->pads[link.remote_port];
> > +		sink = &video->vdev.entity;
> > +		sink_pad = &video->pad;
> > +
> > +		v4l2_fwnode_put_link(&link);
> > +
> > +		/* Create the media link. */
> > +		dev_dbg(csi->dev, "creating %s:%u -> %s:%u link\n",
> > +			source->name, source_pad->index,
> > +			sink->name, sink_pad->index);
> > +
> > +		ret = media_create_pad_link(source, source_pad->index,
> > +					    sink, sink_pad->index,
> > +					    link_flags);
> > +		if (ret < 0) {
> > +			dev_err(csi->dev,
> > +				"failed to create %s:%u -> %s:%u link\n",
> > +				source->name, source_pad->index,
> > +				sink->name, sink_pad->index);
> > +			break;
> > +		}
> > +
> > +		/* Notify video node */
> > +		ret = media_entity_call(sink, link_setup, sink_pad, source_pad,
> > +					link_flags);
> > +		if (ret == -ENOIOCTLCMD)
> > +			ret = 0;
> > +
> > +		/* found one */
> > +		break;
> > +	}
> > +
> > +	of_node_put(ep);
> > +	return ret;
> > +}
> > +
> > +static int sun6i_graph_notify_complete(struct v4l2_async_notifier *notifier)
> > +{
> > +	struct sun6i_csi *csi =
> > +			container_of(notifier, struct sun6i_csi, notifier);
> > +	struct sun6i_graph_entity *entity;
> > +	int ret;
> > +
> > +	dev_dbg(csi->dev, "notify complete, all subdevs registered\n");
> > +
> > +	/* Create links for every entity. */
> > +	list_for_each_entry(entity, &csi->entities, list) {
> > +		ret = sun6i_graph_build_one(csi, entity);
> > +		if (ret < 0)
> > +			return ret;
> > +	}
> > +
> > +	/* Create links for video node. */
> > +	ret = sun6i_graph_build_video(csi);
> > +	if (ret < 0)
> > +		return ret;
> 
> Can you elaborate a bit on the difference between a node parsed with
> _graph_build_one and _graph_build_video? Can't you just store the
> remote sensor when you build the notifier, and reuse it here?

There maybe many usercases:
1. CSI->Sensor.
2. CSI->MIPI->Sensor.
3. CSI->FPGA->Sensor1
            ->Sensor2.
FPGA maybe some other video processor. FPGA, MIPI, Sensor can be
registered as v4l2 subdevs. We do not care about the driver code
of them. But they should be linked together here.

So, the _graph_build_one is used to link CSI port and subdevs. 
_graph_build_video is used to link CSI port and video node.

This part is also difficult to understand for me. The one CSI module
have only one DMA channel(single port). But thay can be linked to 
different physical port (Parallel or MIPI)(multiple ep) by IF select
register.

For now, the binding can have several ep, the driver will just pick
the first valid one.

> 
> > +struct sun6i_csi_ops {
> > +	int (*get_supported_pixformats)(struct sun6i_csi *csi,
> > +					const u32 **pixformats);
> > +	bool (*is_format_support)(struct sun6i_csi *csi, u32 pixformat,
> > +				  u32 mbus_code);
> > +	int (*s_power)(struct sun6i_csi *csi, bool enable);
> > +	int (*update_config)(struct sun6i_csi *csi,
> > +			     struct sun6i_csi_config *config);
> > +	int (*update_buf_addr)(struct sun6i_csi *csi, dma_addr_t addr);
> > +	int (*s_stream)(struct sun6i_csi *csi, bool enable);
> > +};
> 
> Didn't we agreed on removing those in the first iteration? It's not
> really clear at this point whether they will be needed at all. Make
> something simple first, without those ops. When we'll support other
> SoCs we'll have a better chance at seeing what and how we should deal
> with potential quirks.

OK. But without ops, it is inappropriate to sun6i_csi and sun6i_csi.
Maybe I should merge the two files.

> 
> > +#ifdef DEBUG
> > +static void sun6i_csi_dump_regs(struct sun6i_csi_dev *sdev)
> > +{
> > +	struct regmap *regmap = sdev->regmap;
> > +	u32 val;
> > +
> > +	regmap_read(regmap, CSI_EN_REG, &val);
> > +	printk("CSI_EN_REG=0x%x\n",		val);
> > +	regmap_read(regmap, CSI_IF_CFG_REG, &val);
> > +	printk("CSI_IF_CFG_REG=0x%x\n",		val);
> > +	regmap_read(regmap, CSI_CAP_REG, &val);
> > +	printk("CSI_CAP_REG=0x%x\n",		val);
> > +	regmap_read(regmap, CSI_SYNC_CNT_REG, &val);
> > +	printk("CSI_SYNC_CNT_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_FIFO_THRS_REG, &val);
> > +	printk("CSI_FIFO_THRS_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_PTN_LEN_REG, &val);
> > +	printk("CSI_PTN_LEN_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_PTN_ADDR_REG, &val);
> > +	printk("CSI_PTN_ADDR_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_VER_REG, &val);
> > +	printk("CSI_VER_REG=0x%x\n",		val);
> > +	regmap_read(regmap, CSI_CH_CFG_REG, &val);
> > +	printk("CSI_CH_CFG_REG=0x%x\n",		val);
> > +	regmap_read(regmap, CSI_CH_SCALE_REG, &val);
> > +	printk("CSI_CH_SCALE_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_F0_BUFA_REG, &val);
> > +	printk("CSI_CH_F0_BUFA_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_F1_BUFA_REG, &val);
> > +	printk("CSI_CH_F1_BUFA_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_F2_BUFA_REG, &val);
> > +	printk("CSI_CH_F2_BUFA_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_STA_REG, &val);
> > +	printk("CSI_CH_STA_REG=0x%x\n",		val);
> > +	regmap_read(regmap, CSI_CH_INT_EN_REG, &val);
> > +	printk("CSI_CH_INT_EN_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_INT_STA_REG, &val);
> > +	printk("CSI_CH_INT_STA_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_FLD1_VSIZE_REG, &val);
> > +	printk("CSI_CH_FLD1_VSIZE_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_HSIZE_REG, &val);
> > +	printk("CSI_CH_HSIZE_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_VSIZE_REG, &val);
> > +	printk("CSI_CH_VSIZE_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_BUF_LEN_REG, &val);
> > +	printk("CSI_CH_BUF_LEN_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_FLIP_SIZE_REG, &val);
> > +	printk("CSI_CH_FLIP_SIZE_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_FRM_CLK_CNT_REG, &val);
> > +	printk("CSI_CH_FRM_CLK_CNT_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_ACC_ITNL_CLK_CNT_REG, &val);
> > +	printk("CSI_CH_ACC_ITNL_CLK_CNT_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_FIFO_STAT_REG, &val);
> > +	printk("CSI_CH_FIFO_STAT_REG=0x%x\n",	val);
> > +	regmap_read(regmap, CSI_CH_PCLK_STAT_REG, &val);
> > +	printk("CSI_CH_PCLK_STAT_REG=0x%x\n",	val);
> > +}
> > +#endif
> 
> You can already dump a regmap through debugfs, that's redundant.
> 
> > +
> > +static void sun6i_csi_setup_bus(struct sun6i_csi_dev *sdev)
> > +{
> > +	struct v4l2_fwnode_endpoint *endpoint = &sdev->csi.v4l2_ep;
> > +	unsigned char bus_width;
> > +	u32 flags;
> > +	u32 cfg;
> > +
> > +	bus_width = endpoint->bus.parallel.bus_width;
> > +
> > +	regmap_read(sdev->regmap, CSI_IF_CFG_REG, &cfg);
> > +
> > +	cfg &= ~(CSI_IF_CFG_CSI_IF_MASK | CSI_IF_CFG_MIPI_IF_MASK |
> > +		 CSI_IF_CFG_IF_DATA_WIDTH_MASK |
> > +		 CSI_IF_CFG_CLK_POL_MASK | CSI_IF_CFG_VREF_POL_MASK |
> > +		 CSI_IF_CFG_HREF_POL_MASK | CSI_IF_CFG_FIELD_MASK);
> > +
> > +	switch (endpoint->bus_type) {
> > +	case V4L2_MBUS_CSI2:
> > +		cfg |= CSI_IF_CFG_MIPI_IF_MIPI;
> > +		break;
> > +	case V4L2_MBUS_PARALLEL:
> > +		cfg |= CSI_IF_CFG_MIPI_IF_CSI;
> > +
> > +		flags = endpoint->bus.parallel.flags;
> > +
> > +		cfg |= (bus_width == 16) ? CSI_IF_CFG_CSI_IF_YUV422_16BIT :
> > +					   CSI_IF_CFG_CSI_IF_YUV422_INTLV;
> > +
> > +		if (flags & V4L2_MBUS_FIELD_EVEN_LOW)
> > +			cfg |= CSI_IF_CFG_FIELD_POSITIVE;
> > +
> > +		if (flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
> > +			cfg |= CSI_IF_CFG_VREF_POL_POSITIVE;
> > +		if (flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
> > +			cfg |= CSI_IF_CFG_HREF_POL_POSITIVE;
> > +
> > +		if (flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
> > +			cfg |= CSI_IF_CFG_CLK_POL_FALLING_EDGE;
> > +		break;
> > +	case V4L2_MBUS_BT656:
> > +		cfg |= CSI_IF_CFG_MIPI_IF_CSI;
> > +
> > +		flags = endpoint->bus.parallel.flags;
> > +
> > +		cfg |= (bus_width == 16) ? CSI_IF_CFG_CSI_IF_BT1120 :
> > +					   CSI_IF_CFG_CSI_IF_BT656;
> > +
> > +		if (flags & V4L2_MBUS_FIELD_EVEN_LOW)
> > +			cfg |= CSI_IF_CFG_FIELD_POSITIVE;
> > +
> > +		if (flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
> > +			cfg |= CSI_IF_CFG_CLK_POL_FALLING_EDGE;
> > +		break;
> > +	default:
> > +		BUG();
> 
> BUG() will generate a kernel panic, which seems a bit too extreme :)
> How about a warning instead?

OK.

> 
> > +static int set_power(struct sun6i_csi *csi, bool enable)
> > +{
> > +	struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> > +	struct regmap *regmap = sdev->regmap;
> > +	int ret;
> > +
> > +	if (!enable) {
> > +		regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, 0);
> > +
> > +		clk_disable_unprepare(sdev->clk_ram);
> > +		clk_disable_unprepare(sdev->clk_mod);
> > +		clk_disable_unprepare(sdev->clk_ahb);
> > +		reset_control_assert(sdev->rstc_ahb);
> > +		return 0;
> > +	}
> > +
> > +	ret = clk_prepare_enable(sdev->clk_ahb);
> > +	if (ret) {
> > +		dev_err(sdev->dev, "Enable ahb clk err %d\n", ret);
> > +		return ret;
> > +	}
> 
> The ahb clock doesn't need to be running all the time, at least since
> the SoCs that have a reset line for every
> controller. regmap_init_mmio_clk will take care of enabling it only
> when you access the registers, which is what you need.

I will check this.

> 
> > +	ret = clk_prepare_enable(sdev->clk_mod);
> > +	if (ret) {
> > +		dev_err(sdev->dev, "Enable csi clk err %d\n", ret);
> > +		return ret;
> > +	}
> > +
> > +	ret = clk_prepare_enable(sdev->clk_ram);
> > +	if (ret) {
> > +		dev_err(sdev->dev, "Enable clk_dram_csi clk err %d\n", ret);
> > +		return ret;
> > +	}
> > +
> > +	if (!IS_ERR_OR_NULL(sdev->rstc_ahb)) {
> 
> A missing reset line should not be allowed to probe, just like the
> clocks aren't, so this condition should never fail (and therefore is
> basically useless).

OK.

> 
> > +		ret = reset_control_deassert(sdev->rstc_ahb);
> > +		if (ret) {
> > +			dev_err(sdev->dev, "reset err %d\n", ret);
> > +			return ret;
> > +		}
> > +	}
> > +
> > +	regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, CSI_EN_CSI_EN);
> > +
> > +	return 0;
> > +}
> > +
> > +static int update_config(struct sun6i_csi *csi,
> > +			 struct sun6i_csi_config *config)
> > +{
> > +	struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> > +
> > +	if (config == NULL)
> > +		return -EINVAL;
> > +
> > +	memcpy(&csi->config, config, sizeof(csi->config));
> > +
> > +	sun6i_csi_setup_bus(sdev);
> > +	sun6i_csi_set_format(sdev);
> > +	sun6i_csi_set_window(sdev);
> > +
> > +	return 0;
> > +}
> > +
> > +static int update_buf_addr(struct sun6i_csi *csi, dma_addr_t addr)
> > +{
> > +	struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> > +	/* transform physical address to bus address */
> > +	dma_addr_t bus_addr = addr - 0x40000000;
> 
> Like Baruch noticed, you should use PHYS_OFFSET here. The A80 for
> example has a different RAM base address.

OK. I will try it again.

> 
> > +
> > +	regmap_write(sdev->regmap, CSI_CH_F0_BUFA_REG,
> > +		     (bus_addr + sdev->planar_offset[0]) >> 2);
> > +	if (sdev->planar_offset[1] != -1)
> > +		regmap_write(sdev->regmap, CSI_CH_F1_BUFA_REG,
> > +			     (bus_addr + sdev->planar_offset[1]) >> 2);
> > +	if (sdev->planar_offset[2] != -1)
> > +		regmap_write(sdev->regmap, CSI_CH_F2_BUFA_REG,
> > +			     (bus_addr + sdev->planar_offset[2]) >> 2);
> > +
> > +	return 0;
> > +}
> > +
> > +static int set_stream(struct sun6i_csi *csi, bool enable)
> > +{
> > +	struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> > +	struct regmap *regmap = sdev->regmap;
> > +
> > +	if (!enable) {
> > +		regmap_update_bits(regmap, CSI_CAP_REG, CSI_CAP_CH0_VCAP_ON, 0);
> > +		regmap_write(regmap, CSI_CH_INT_EN_REG, 0);
> > +		return 0;
> > +	}
> > +
> > +	regmap_write(regmap, CSI_CH_INT_STA_REG, 0xFF);
> > +	regmap_write(regmap, CSI_CH_INT_EN_REG,
> > +		     CSI_CH_INT_EN_HB_OF_INT_EN |
> > +		     CSI_CH_INT_EN_FIFO2_OF_INT_EN |
> > +		     CSI_CH_INT_EN_FIFO1_OF_INT_EN |
> > +		     CSI_CH_INT_EN_FIFO0_OF_INT_EN |
> > +		     CSI_CH_INT_EN_FD_INT_EN |
> > +		     CSI_CH_INT_EN_CD_INT_EN);
> > +
> > +	regmap_update_bits(regmap, CSI_CAP_REG, CSI_CAP_CH0_VCAP_ON,
> > +			   CSI_CAP_CH0_VCAP_ON);
> > +
> > +	return 0;
> > +}
> > +
> > +static struct sun6i_csi_ops csi_ops = {
> > +	.get_supported_pixformats	= get_supported_pixformats,
> > +	.is_format_support		= is_format_support,
> > +	.s_power			= set_power,
> > +	.update_config			= update_config,
> > +	.update_buf_addr		= update_buf_addr,
> > +	.s_stream			= set_stream,
> > +};
> > +
> > +static irqreturn_t sun6i_csi_isr(int irq, void *dev_id)
> > +{
> > +	struct sun6i_csi_dev *sdev = (struct sun6i_csi_dev *)dev_id;
> > +	struct regmap *regmap = sdev->regmap;
> > +	u32 status;
> > +
> > +	regmap_read(regmap, CSI_CH_INT_STA_REG, &status);
> > +
> > +	if ((status & CSI_CH_INT_STA_FIFO0_OF_PD) ||
> > +	    (status & CSI_CH_INT_STA_FIFO1_OF_PD) ||
> > +	    (status & CSI_CH_INT_STA_FIFO2_OF_PD) ||
> > +	    (status & CSI_CH_INT_STA_HB_OF_PD)) {
> > +		regmap_write(regmap, CSI_CH_INT_STA_REG, status);
> > +		regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, 0);
> > +		regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN,
> > +				   CSI_EN_CSI_EN);
> 
> You need to enable / disable it at every frame? How do you deal with
> double buffering? (or did you choose to ignore it for now?)

Quoting Baruch's reply:
These *_OF_PD status bits indicate an overflow error condition.

> 
> > +		return IRQ_HANDLED;
> > +	}
> > +
> > +	if (status & CSI_CH_INT_STA_FD_PD) {
> > +		sun6i_video_frame_done(&sdev->csi.video);
> > +	}
> > +
> > +	regmap_write(regmap, CSI_CH_INT_STA_REG, status);
> 
> Isn't it redundant with the one you did in the condition a bit above?
> 
> You should also check that your device indeed generated an
> interrupt. In the occurence of a spourious interrupt, your code will
> return IRQ_HANDLED, which is the wrong thing to do.
> 
> I think you should reverse your logic a bit here to make this
> easier. You should just check that your status flags are indeed set,
> and if not just bail out and return IRQ_NONE.
> 
> And if they are, go on with treating your interrupt.

OK. I will add check for status flags.
BTW, how can a spurious interrupt occurred?

> 
> > +
> > +	return IRQ_HANDLED;
> > +}
> > +
> > +static const struct regmap_config sun6i_csi_regmap_config = {
> > +	.reg_bits       = 32,
> > +	.reg_stride     = 4,
> > +	.val_bits       = 32,
> > +	.max_register	= 0x1000,
> > +};
> > +
> > +static int sun6i_csi_resource_request(struct sun6i_csi_dev *sdev,
> > +				      struct platform_device *pdev)
> > +{
> > +	struct resource *res;
> > +	void __iomem *io_base;
> > +	int ret;
> > +	int irq;
> > +
> > +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > +	io_base = devm_ioremap_resource(&pdev->dev, res);
> > +	if (IS_ERR(io_base))
> > +		return PTR_ERR(io_base);
> > +
> > +	sdev->regmap = devm_regmap_init_mmio(&pdev->dev, io_base,
> > +					    &sun6i_csi_regmap_config);
> > +	if (IS_ERR(sdev->regmap)) {
> > +		dev_err(&pdev->dev, "Failed to init register map\n");
> > +		return PTR_ERR(sdev->regmap);
> > +	}
> > +
> > +	sdev->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
> > +	if (IS_ERR(sdev->clk_ahb)) {
> > +		dev_err(&pdev->dev, "Unable to acquire ahb clock\n");
> > +		return PTR_ERR(sdev->clk_ahb);
> > +	}
> > +	sdev->clk_mod = devm_clk_get(&pdev->dev, "mod");
> > +	if (IS_ERR(sdev->clk_mod)) {
> > +		dev_err(&pdev->dev, "Unable to acquire csi clock\n");
> > +		return PTR_ERR(sdev->clk_mod);
> > +	}
> > +
> > +	sdev->clk_ram = devm_clk_get(&pdev->dev, "ram");
> > +	if (IS_ERR(sdev->clk_ram)) {
> > +		dev_err(&pdev->dev, "Unable to acquire dram-csi clock\n");
> > +		return PTR_ERR(sdev->clk_ram);
> > +	}
> > +
> > +	sdev->rstc_ahb = devm_reset_control_get_optional_shared(&pdev->dev, NULL);
> 
> It is not optional, the reset line is always going to be there (at
> least on the SoCs that have been out so far), and a missing reset line
> in the DT must be reported as an error, since the device will not be
> able to operate properly.

The CSI0 and CSI1 share the same bus clk and reset line. I should use 
the devm_reset_control_get_shared instead.

> 
> Thanks!
> Maxime
> 
> -- 
> Maxime Ripard, Free Electrons
> Embedded Linux and Kernel engineering
> http://free-electrons.com


Thanks,
Yong

Baruch Siach July 31, 2017, 5:13 a.m. UTC | #8

Hi Yong,

On Mon, Jul 31, 2017 at 09:48:06AM +0800, Yong wrote:
> On Sun, 30 Jul 2017 09:08:01 +0300
> Baruch Siach <[e-mail]> wrote:
> > On Fri, Jul 28, 2017 at 06:02:33PM +0200, Maxime Ripard wrote:
> > > On Thu, Jul 27, 2017 at 01:01:35PM +0800, Yong Deng wrote:
> > > > +	regmap_write(sdev->regmap, CSI_CH_F0_BUFA_REG,
> > > > +		     (bus_addr + sdev->planar_offset[0]) >> 2);
> > 
> > Why do you need the bit shift? Does that work for you?
> > 
> > The User Manuals of both the V3s and the and the A33 (AKA R16) state that the 
> > BUFA field size in this register is 31:00, that is 32bit. I have found no 
> > indication of this bit shift in the Olimex provided sunxi-vfe[1] driver. On 
> > the A33 I have found that only after removing the bit-shift, (some sort of) 
> > data started to appear in the buffer.
> > 
> > [1] https://github.com/hehopmajieh/a33_linux/tree/master/drivers/media/video/sunxi-vfe
> 
> The Users Manuals do not document this bit shift. You should see line 10 to
> 32 in https://github.com/hehopmajieh/a33_linux/blob/master/drivers/media/video/sunxi-vfe/csi/csi_reg.c

Thanks. So for my reference, the SoCs that don't need bit shift are A31, A23, 
and A33. SoCs that need bit shift are A80, A83, H3, and V3s (AKA V30).

baruch

Hans Verkuil Aug. 21, 2017, 2:37 p.m. UTC | #9

Hi Yong,

First two high-level comments before I start the review:

1) Can you provide the v4l2-compliance output? I can't merge this unless I
   see that it passes the compliance tests. Make sure you compile from the git
   repo (https://git.linuxtv.org/v4l-utils.git/) so you are using the latest
   version of the compliance test. Test with just 'v4l2-compliance' and also
   with the -s option (to test streaming) and with the -f option (to test all
   the various pixel formats).

2) I see you support interlaced formats. Did you actually test that? Interlaced
   is tricky and you shouldn't add support for it unless you know it works and
   that it passes the 'v4l2-compliance -s' test.

On 07/27/2017 07:01 AM, Yong Deng wrote:
> Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> and CSI1 is used for parallel interface. This is not documented in
> datasheet but by testing and guess.
> 
> This patch implement a v4l2 framework driver for it.
> 
> Currently, the driver only support the parallel interface. MIPI-CSI2,
> ISP's support are not included in this patch.
> 
> Signed-off-by: Yong Deng <[e-mail]>
> ---
>  drivers/media/platform/Kconfig                   |   1 +
>  drivers/media/platform/Makefile                  |   2 +
>  drivers/media/platform/sun6i-csi/Kconfig         |   9 +
>  drivers/media/platform/sun6i-csi/Makefile        |   3 +
>  drivers/media/platform/sun6i-csi/sun6i_csi.c     | 545 +++++++++++++++
>  drivers/media/platform/sun6i-csi/sun6i_csi.h     | 203 ++++++
>  drivers/media/platform/sun6i-csi/sun6i_csi_v3s.c | 827 +++++++++++++++++++++++
>  drivers/media/platform/sun6i-csi/sun6i_csi_v3s.h | 206 ++++++
>  drivers/media/platform/sun6i-csi/sun6i_video.c   | 663 ++++++++++++++++++
>  drivers/media/platform/sun6i-csi/sun6i_video.h   |  61 ++
>  10 files changed, 2520 insertions(+)
>  create mode 100644 drivers/media/platform/sun6i-csi/Kconfig
>  create mode 100644 drivers/media/platform/sun6i-csi/Makefile
>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi.c
>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi.h
>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi_v3s.c
>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi_v3s.h
>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_video.c
>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_video.h
> 

<snip>

> diff --git a/drivers/media/platform/sun6i-csi/sun6i_video.c b/drivers/media/platform/sun6i-csi/sun6i_video.c
> new file mode 100644
> index 0000000..0c5dbd2
> --- /dev/null
> +++ b/drivers/media/platform/sun6i-csi/sun6i_video.c
> @@ -0,0 +1,663 @@
> +/*
> + * Copyright (c) 2017 Magewell Electronics Co., Ltd. (Nanjing).
> + * All rights reserved.
> + * Author: Yong Deng <[e-mail]>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/of.h>
> +
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/v4l2-mc.h>
> +#include <media/videobuf2-dma-contig.h>
> +#include <media/videobuf2-v4l2.h>
> +
> +#include "sun6i_csi.h"
> +#include "sun6i_video.h"
> +
> +struct sun6i_csi_buffer {
> +	struct vb2_v4l2_buffer		vb;
> +	struct list_head		list;
> +
> +	dma_addr_t			dma_addr;
> +};
> +
> +static struct sun6i_csi_format *
> +find_format_by_fourcc(struct sun6i_video *video, unsigned int fourcc)
> +{
> +	unsigned int num_formats = video->num_formats;
> +	struct sun6i_csi_format *fmt;
> +	unsigned int i;
> +
> +	for (i = 0; i < num_formats; i++) {
> +		fmt = &video->formats[i];
> +		if (fmt->fourcc == fourcc)
> +			return fmt;
> +	}
> +
> +	return NULL;
> +}
> +
> +static struct v4l2_subdev *
> +sun6i_video_remote_subdev(struct sun6i_video *video, u32 *pad)
> +{
> +	struct media_pad *remote;
> +
> +	remote = media_entity_remote_pad(&video->pad);
> +
> +	if (!remote || !is_media_entity_v4l2_subdev(remote->entity))
> +		return NULL;
> +
> +	if (pad)
> +		*pad = remote->index;
> +
> +	return media_entity_to_v4l2_subdev(remote->entity);
> +}
> +
> +static int sun6i_video_queue_setup(struct vb2_queue *vq,
> +				 unsigned int *nbuffers, unsigned int *nplanes,
> +				 unsigned int sizes[],
> +				 struct device *alloc_devs[])
> +{
> +	struct sun6i_video *video = vb2_get_drv_priv(vq);
> +	unsigned int size = video->fmt.fmt.pix.sizeimage;
> +
> +	if (*nplanes)
> +		return sizes[0] < size ? -EINVAL : 0;
> +
> +	*nplanes = 1;
> +	sizes[0] = size;
> +
> +	return 0;
> +}
> +
> +static int sun6i_video_buffer_prepare(struct vb2_buffer *vb)
> +{
> +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> +	struct sun6i_csi_buffer *buf =
> +			container_of(vbuf, struct sun6i_csi_buffer, vb);
> +	struct sun6i_video *video = vb2_get_drv_priv(vb->vb2_queue);
> +	unsigned long size = video->fmt.fmt.pix.sizeimage;
> +
> +	if (vb2_plane_size(vb, 0) < size) {
> +		v4l2_err(video->vdev.v4l2_dev, "buffer too small (%lu < %lu)\n",
> +			 vb2_plane_size(vb, 0), size);
> +		return -EINVAL;
> +	}
> +
> +	vb2_set_plane_payload(vb, 0, size);
> +
> +	buf->dma_addr = vb2_dma_contig_plane_dma_addr(vb, 0);
> +
> +	vbuf->field = video->fmt.fmt.pix.field;
> +
> +	return 0;
> +}
> +
> +static int sun6i_pipeline_set_stream(struct sun6i_video *video, bool enable)
> +{
> +	struct media_entity *entity;
> +	struct media_pad *pad;
> +	struct v4l2_subdev *subdev;
> +	int ret;
> +
> +	entity = &video->vdev.entity;
> +	while (1) {
> +		pad = &entity->pads[0];
> +		if (!(pad->flags & MEDIA_PAD_FL_SINK))
> +			break;
> +
> +		pad = media_entity_remote_pad(pad);
> +		if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
> +			break;
> +
> +		entity = pad->entity;
> +		subdev = media_entity_to_v4l2_subdev(entity);
> +
> +		ret = v4l2_subdev_call(subdev, video, s_stream, enable);
> +		if (enable && ret < 0 && ret != -ENOIOCTLCMD)
> +			return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int sun6i_video_start_streaming(struct vb2_queue *vq, unsigned int count)
> +{
> +	struct sun6i_video *video = vb2_get_drv_priv(vq);
> +	struct sun6i_csi_buffer *buf;
> +	struct sun6i_csi_config config;
> +	unsigned long flags;
> +	int ret;
> +
> +	video->sequence = 0;
> +
> +	ret = media_pipeline_start(&video->vdev.entity, &video->vdev.pipe);
> +	if (ret < 0)
> +		goto err_start_pipeline;
> +
> +	ret = sun6i_pipeline_set_stream(video, true);
> +	if (ret < 0)
> +		goto err_start_stream;
> +
> +	config.pixelformat = video->fmt.fmt.pix.pixelformat;
> +	config.code = video->current_fmt->mbus_code;
> +	config.field = video->fmt.fmt.pix.field;
> +	config.width = video->fmt.fmt.pix.width;
> +	config.height = video->fmt.fmt.pix.height;
> +
> +	ret = sun6i_csi_update_config(video->csi, &config);
> +	if (ret < 0)
> +		goto err_update_config;
> +
> +	spin_lock_irqsave(&video->dma_queue_lock, flags);
> +	video->cur_frm = list_first_entry(&video->dma_queue,
> +					  struct sun6i_csi_buffer, list);
> +	list_del(&video->cur_frm->list);
> +	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
> +
> +	ret = sun6i_csi_update_buf_addr(video->csi, video->cur_frm->dma_addr);
> +	if (ret < 0)
> +		goto err_update_addr;
> +
> +	ret = sun6i_csi_set_stream(video->csi, true);
> +	if (ret < 0)
> +		goto err_csi_stream;
> +
> +	return 0;
> +
> +err_csi_stream:
> +err_update_addr:
> +err_update_config:
> +	sun6i_pipeline_set_stream(video, false);
> +err_start_stream:
> +	media_pipeline_stop(&video->vdev.entity);
> +err_start_pipeline:
> +	spin_lock_irqsave(&video->dma_queue_lock, flags);
> +	list_for_each_entry(buf, &video->dma_queue, list)
> +		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
> +	INIT_LIST_HEAD(&video->dma_queue);
> +	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
> +
> +	return ret;
> +}
> +
> +static void sun6i_video_stop_streaming(struct vb2_queue *vq)
> +{
> +	struct sun6i_video *video = vb2_get_drv_priv(vq);
> +	unsigned long flags;
> +	struct sun6i_csi_buffer *buf;
> +
> +	sun6i_pipeline_set_stream(video, false);
> +
> +	sun6i_csi_set_stream(video->csi, false);
> +
> +	media_pipeline_stop(&video->vdev.entity);
> +
> +	/* Release all active buffers */
> +	spin_lock_irqsave(&video->dma_queue_lock, flags);
> +	if (unlikely(video->cur_frm)) {
> +		vb2_buffer_done(&video->cur_frm->vb.vb2_buf,
> +				VB2_BUF_STATE_ERROR);
> +		video->cur_frm = NULL;
> +	}
> +	list_for_each_entry(buf, &video->dma_queue, list)
> +		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
> +	INIT_LIST_HEAD(&video->dma_queue);
> +	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
> +}
> +
> +static void sun6i_video_buffer_queue(struct vb2_buffer *vb)
> +{
> +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> +	struct sun6i_csi_buffer *buf =
> +			container_of(vbuf, struct sun6i_csi_buffer, vb);
> +	struct sun6i_video *video = vb2_get_drv_priv(vb->vb2_queue);
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&video->dma_queue_lock, flags);
> +	if (!video->cur_frm && list_empty(&video->dma_queue) &&
> +		vb2_is_streaming(vb->vb2_queue)) {
> +		video->cur_frm = buf;
> +		sun6i_csi_update_buf_addr(video->csi, video->cur_frm->dma_addr);
> +		sun6i_csi_set_stream(video->csi, 1);
> +	} else
> +		list_add_tail(&buf->list, &video->dma_queue);
> +	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
> +}
> +
> +void sun6i_video_frame_done(struct sun6i_video *video)
> +{
> +	spin_lock(&video->dma_queue_lock);
> +
> +	if (video->cur_frm) {
> +		struct vb2_v4l2_buffer *vbuf = &video->cur_frm->vb;
> +		struct vb2_buffer *vb = &vbuf->vb2_buf;
> +
> +		vb->timestamp = ktime_get_ns();
> +		vbuf->sequence = video->sequence++;
> +		vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
> +		video->cur_frm = NULL;
> +	}
> +
> +	if (!list_empty(&video->dma_queue)
> +	    && vb2_is_streaming(&video->vb2_vidq)) {
> +		video->cur_frm = list_first_entry(&video->dma_queue,
> +				struct sun6i_csi_buffer, list);
> +		list_del(&video->cur_frm->list);
> +		sun6i_csi_update_buf_addr(video->csi, video->cur_frm->dma_addr);
> +	} else
> +		sun6i_csi_set_stream(video->csi, 0);
> +
> +	spin_unlock(&video->dma_queue_lock);
> +}
> +
> +static struct vb2_ops sun6i_csi_vb2_ops = {
> +	.queue_setup		= sun6i_video_queue_setup,
> +	.wait_prepare		= vb2_ops_wait_prepare,
> +	.wait_finish		= vb2_ops_wait_finish,
> +	.buf_prepare		= sun6i_video_buffer_prepare,
> +	.start_streaming	= sun6i_video_start_streaming,
> +	.stop_streaming		= sun6i_video_stop_streaming,
> +	.buf_queue		= sun6i_video_buffer_queue,
> +};
> +
> +static int vidioc_querycap(struct file *file, void *priv,
> +				struct v4l2_capability *cap)
> +{
> +	struct sun6i_video *video = video_drvdata(file);
> +
> +	strlcpy(cap->driver, "sun6i-video", sizeof(cap->driver));
> +	strlcpy(cap->card, video->vdev.name, sizeof(cap->card));
> +	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
> +		 video->csi->dev->of_node->name);
> +
> +	return 0;
> +}
> +
> +static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
> +				   struct v4l2_fmtdesc *f)
> +{
> +	struct sun6i_video *video = video_drvdata(file);
> +	u32 index = f->index;
> +
> +	if (index >= video->num_formats)
> +		return -EINVAL;
> +
> +	f->pixelformat = video->formats[index].fourcc;
> +
> +	return 0;
> +}
> +
> +static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
> +				struct v4l2_format *fmt)
> +{
> +	struct sun6i_video *video = video_drvdata(file);
> +
> +	*fmt = video->fmt;
> +
> +	return 0;
> +}
> +
> +static int sun6i_video_try_fmt(struct sun6i_video *video, struct v4l2_format *f,
> +			       struct sun6i_csi_format **current_fmt)
> +{
> +	struct sun6i_csi_format *csi_fmt;
> +	struct v4l2_pix_format *pixfmt = &f->fmt.pix;
> +	struct v4l2_subdev_format format;
> +	struct v4l2_subdev *subdev;
> +	u32 pad;
> +	int ret;
> +
> +	subdev = sun6i_video_remote_subdev(video, &pad);
> +	if (subdev == NULL)
> +		return -ENXIO;
> +
> +	csi_fmt = find_format_by_fourcc(video, pixfmt->pixelformat);
> +	if (csi_fmt == NULL)
> +		return -EINVAL;
> +
> +	format.pad = pad;
> +	format.which = V4L2_SUBDEV_FORMAT_TRY;
> +	v4l2_fill_mbus_format(&format.format, pixfmt, csi_fmt->mbus_code);
> +	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &format);
> +	if (ret)
> +		return ret;
> +
> +	v4l2_fill_pix_format(pixfmt, &format.format);
> +
> +	pixfmt->bytesperline = (pixfmt->width * csi_fmt->bpp) >> 3;
> +	pixfmt->sizeimage = (pixfmt->width * csi_fmt->bpp * pixfmt->height) / 8;
> +
> +	if (current_fmt)
> +		*current_fmt = csi_fmt;
> +
> +	return 0;
> +}
> +
> +static int sun6i_video_set_fmt(struct sun6i_video *video, struct v4l2_format *f)
> +{
> +	struct v4l2_subdev_format format;
> +	struct sun6i_csi_format *current_fmt;
> +	struct v4l2_subdev *subdev;
> +	u32 pad;
> +	int ret;
> +
> +	subdev = sun6i_video_remote_subdev(video, &pad);
> +	if (subdev == NULL)
> +		return -ENXIO;
> +
> +	ret = sun6i_video_try_fmt(video, f, &current_fmt);
> +	if (ret)
> +		return ret;
> +
> +	format.which = V4L2_SUBDEV_FORMAT_ACTIVE;
> +	v4l2_fill_mbus_format(&format.format, &f->fmt.pix,
> +			      current_fmt->mbus_code);
> +	ret = v4l2_subdev_call(subdev, pad, set_fmt, NULL, &format);
> +	if (ret < 0)
> +		return ret;
> +
> +	video->fmt = *f;
> +	video->current_fmt = current_fmt;
> +
> +	return 0;
> +}
> +
> +static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
> +				struct v4l2_format *f)
> +{
> +	struct sun6i_video *video = video_drvdata(file);
> +
> +	if (vb2_is_streaming(&video->vb2_vidq))

This should be vb2_is_busy(). Once buffers are allocated you are no longer allowed
to change the format, regardless of whether you are streaming or not.

> +		return -EBUSY;
> +
> +	return sun6i_video_set_fmt(video, f);
> +}
> +
> +static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
> +				  struct v4l2_format *f)
> +{
> +	struct sun6i_video *video = video_drvdata(file);
> +
> +	return sun6i_video_try_fmt(video, f, NULL);
> +}
> +
> +static const struct v4l2_ioctl_ops sun6i_video_ioctl_ops = {
> +	.vidioc_querycap		= vidioc_querycap,
> +	.vidioc_enum_fmt_vid_cap	= vidioc_enum_fmt_vid_cap,
> +	.vidioc_g_fmt_vid_cap		= vidioc_g_fmt_vid_cap,
> +	.vidioc_s_fmt_vid_cap		= vidioc_s_fmt_vid_cap,
> +	.vidioc_try_fmt_vid_cap		= vidioc_try_fmt_vid_cap,
> +
> +	.vidioc_reqbufs			= vb2_ioctl_reqbufs,
> +	.vidioc_querybuf		= vb2_ioctl_querybuf,
> +	.vidioc_qbuf			= vb2_ioctl_qbuf,
> +	.vidioc_expbuf			= vb2_ioctl_expbuf,
> +	.vidioc_dqbuf			= vb2_ioctl_dqbuf,
> +	.vidioc_create_bufs		= vb2_ioctl_create_bufs,
> +	.vidioc_prepare_buf		= vb2_ioctl_prepare_buf,
> +	.vidioc_streamon		= vb2_ioctl_streamon,
> +	.vidioc_streamoff		= vb2_ioctl_streamoff,
> +};
> +
> +/* -----------------------------------------------------------------------------
> + * V4L2 file operations
> + */
> +static int sun6i_video_open(struct file *file)
> +{
> +	struct sun6i_video *video = video_drvdata(file);
> +	struct v4l2_format format;
> +	int ret;
> +
> +	if (mutex_lock_interruptible(&video->lock))
> +		return -ERESTARTSYS;
> +
> +	ret = v4l2_fh_open(file);
> +	if (ret < 0)
> +		goto unlock;
> +
> +	ret = v4l2_pipeline_pm_use(&video->vdev.entity, 1);
> +	if (ret < 0)
> +		goto fh_release;
> +
> +	if (!v4l2_fh_is_singular_file(file))
> +		goto unlock;
> +
> +	ret = sun6i_csi_set_power(video->csi, true);
> +	if (ret < 0)
> +		goto fh_release;
> +
> +	/* setup default format */
> +	if (video->num_formats > 0) {
> +		format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> +		format.fmt.pix.width = 1280;
> +		format.fmt.pix.height = 720;
> +		format.fmt.pix.pixelformat = video->formats[0].fourcc;
> +		sun6i_video_set_fmt(video, &format);
> +	}

No, this should happen when the driver is initialized. The format is
persistent over open()/close() calls so should not be re-initialized
here.

> +
> +	mutex_unlock(&video->lock);
> +	return 0;
> +
> +fh_release:
> +	v4l2_fh_release(file);
> +unlock:
> +	mutex_unlock(&video->lock);
> +	return ret;
> +}
> +
> +static int sun6i_video_close(struct file *file)
> +{
> +	struct sun6i_video *video = video_drvdata(file);
> +	bool last_fh;
> +
> +	mutex_lock(&video->lock);
> +
> +	last_fh = v4l2_fh_is_singular_file(file);
> +
> +	_vb2_fop_release(file, NULL);
> +
> +	v4l2_pipeline_pm_use(&video->vdev.entity, 0);
> +
> +	if (last_fh)
> +		sun6i_csi_set_power(video->csi, false);
> +
> +	mutex_unlock(&video->lock);
> +
> +	return 0;
> +}
> +
> +static const struct v4l2_file_operations sun6i_video_fops = {
> +	.owner		= THIS_MODULE,
> +	.open		= sun6i_video_open,
> +	.release	= sun6i_video_close,
> +	.unlocked_ioctl	= video_ioctl2,
> +	.mmap		= vb2_fop_mmap,
> +	.poll		= vb2_fop_poll
> +};
> +
> +/* -----------------------------------------------------------------------------
> + * Media Operations
> + */
> +static int sun6i_video_formats_init(struct sun6i_video *video)
> +{
> +	struct v4l2_subdev_mbus_code_enum mbus_code = { 0 };
> +	struct sun6i_csi *csi = video->csi;
> +	struct v4l2_subdev *subdev;
> +	u32 pad;
> +	const u32 *pixformats;
> +	int pixformat_count = 0;
> +	u32 subdev_codes[32]; /* subdev format codes, 32 should be enough */
> +	int codes_count = 0;
> +	int num_fmts = 0;
> +	int i, j;
> +
> +	subdev = sun6i_video_remote_subdev(video, &pad);
> +	if (subdev == NULL)
> +		return -ENXIO;
> +
> +	/* Get supported pixformats of CSI */
> +	pixformat_count = sun6i_csi_get_supported_pixformats(csi, &pixformats);
> +	if (pixformat_count <= 0)
> +		return -ENXIO;
> +
> +	/* Get subdev formats codes */
> +	mbus_code.pad = pad;
> +	mbus_code.which = V4L2_SUBDEV_FORMAT_ACTIVE;
> +	while (!v4l2_subdev_call(subdev, pad, enum_mbus_code, NULL,
> +			&mbus_code)) {
> +		subdev_codes[codes_count] = mbus_code.code;

This definitely needs a check when codes_count >= ARRAY_SIZE(subdev_codes).

> +		codes_count++;
> +		mbus_code.index++;
> +	}
> +
> +	if (!codes_count)
> +		return -ENXIO;
> +
> +	/* Get supported formats count */
> +	for (i = 0; i < codes_count; i++) {
> +		for (j = 0; j < pixformat_count; j++) {
> +			if (!sun6i_csi_is_format_support(csi, pixformats[j],
> +					mbus_code.code)) {
> +				continue;
> +			}
> +			num_fmts++;
> +		}
> +	}
> +
> +	if (!num_fmts)
> +		return -ENXIO;
> +
> +	video->num_formats = num_fmts;
> +	video->formats = devm_kcalloc(video->csi->dev, num_fmts,
> +			sizeof(struct sun6i_csi_format), GFP_KERNEL);
> +	if (!video->formats) {
> +		dev_err(video->csi->dev, "could not allocate memory\n");
> +		return -ENOMEM;
> +	}
> +
> +	/* Get supported formats */
> +	num_fmts = 0;
> +	for (i = 0; i < codes_count; i++) {
> +		for (j = 0; j < pixformat_count; j++) {
> +			if (!sun6i_csi_is_format_support(csi, pixformats[j],
> +					mbus_code.code)) {
> +				continue;
> +			}
> +
> +			video->formats[num_fmts].fourcc = pixformats[j];
> +			video->formats[num_fmts].mbus_code =
> +					mbus_code.code;
> +			video->formats[num_fmts].bpp =
> +					v4l2_pixformat_get_bpp(pixformats[j]);
> +			num_fmts++;
> +		}
> +	}

As mentioned above, the initial format should probably be configure here.

> +
> +	return 0;
> +}
> +
> +static int sun6i_video_link_setup(struct media_entity *entity,
> +				  const struct media_pad *local,
> +				  const struct media_pad *remote, u32 flags)
> +{
> +	struct video_device *vdev = media_entity_to_video_device(entity);
> +	struct sun6i_video *video = video_get_drvdata(vdev);
> +
> +	if (WARN_ON(video == NULL))
> +		return 0;
> +
> +	return sun6i_video_formats_init(video);

Why is this called here? Why not in video_init()?

> +}
> +
> +static const struct media_entity_operations sun6i_video_media_ops = {
> +	.link_setup = sun6i_video_link_setup,
> +};
> +
> +int sun6i_video_init(struct sun6i_video *video, struct sun6i_csi *csi,
> +		     const char *name)
> +{
> +	struct video_device *vdev = &video->vdev;
> +	struct vb2_queue *vidq = &video->vb2_vidq;
> +	int ret;
> +
> +	video->csi = csi;
> +
> +	/* Initialize the media entity... */
> +	video->pad.flags = MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
> +	vdev->entity.ops = &sun6i_video_media_ops;
> +	ret = media_entity_pads_init(&vdev->entity, 1, &video->pad);
> +	if (ret < 0)
> +		return ret;
> +
> +	mutex_init(&video->lock);
> +
> +	INIT_LIST_HEAD(&video->dma_queue);
> +	spin_lock_init(&video->dma_queue_lock);
> +
> +	video->cur_frm = NULL;
> +	video->sequence = 0;
> +	video->num_formats = 0;
> +
> +	/* Initialize videobuf2 queue */
> +	vidq->type			= V4L2_BUF_TYPE_VIDEO_CAPTURE;
> +	vidq->io_modes			= VB2_MMAP | VB2_DMABUF;
> +	vidq->drv_priv			= video;
> +	vidq->buf_struct_size		= sizeof(struct sun6i_csi_buffer);
> +	vidq->ops			= &sun6i_csi_vb2_ops;
> +	vidq->mem_ops			= &vb2_dma_contig_memops;
> +	vidq->timestamp_flags		= V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
> +	vidq->lock			= &video->lock;
> +	vidq->min_buffers_needed	= 1;
> +	vidq->dev			= csi->dev;
> +
> +	ret = vb2_queue_init(vidq);
> +	if (ret) {
> +		v4l2_err(&csi->v4l2_dev, "vb2_queue_init failed: %d\n", ret);
> +		goto error;
> +	}
> +
> +	/* Register video device */
> +	strlcpy(vdev->name, name, sizeof(vdev->name));
> +	vdev->release		= video_device_release_empty;
> +	vdev->fops		= &sun6i_video_fops;
> +	vdev->ioctl_ops		= &sun6i_video_ioctl_ops;
> +	vdev->vfl_type		= VFL_TYPE_GRABBER;
> +	vdev->vfl_dir		= VFL_DIR_RX;
> +	vdev->v4l2_dev		= &csi->v4l2_dev;
> +	vdev->queue		= vidq;
> +	vdev->lock		= &video->lock;
> +	vdev->device_caps	= V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_CAPTURE;
> +	video_set_drvdata(vdev, video);
> +
> +	ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
> +	if (ret < 0) {
> +		v4l2_err(&csi->v4l2_dev,
> +			 "video_register_device failed: %d\n", ret);
> +		goto error;
> +	}
> +
> +	return 0;
> +
> +error:
> +	sun6i_video_cleanup(video);
> +	return ret;
> +}
> +
> +void sun6i_video_cleanup(struct sun6i_video *video)
> +{
> +	if (video_is_registered(&video->vdev))
> +		video_unregister_device(&video->vdev);
> +
> +	media_entity_cleanup(&video->vdev.entity);
> +}
> diff --git a/drivers/media/platform/sun6i-csi/sun6i_video.h b/drivers/media/platform/sun6i-csi/sun6i_video.h
> new file mode 100644
> index 0000000..14eac6e
> --- /dev/null
> +++ b/drivers/media/platform/sun6i-csi/sun6i_video.h
> @@ -0,0 +1,61 @@
> +/*
> + * Copyright (c) 2017 Yong Deng <[e-mail]>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef __SUN6I_VIDEO_H__
> +#define __SUN6I_VIDEO_H__
> +
> +#include <media/v4l2-dev.h>
> +#include <media/videobuf2-core.h>
> +
> +/*
> + * struct sun6i_csi_format - CSI media bus format information
> + * @fourcc: Fourcc code for this format
> + * @mbus_code: V4L2 media bus format code.
> + * @bpp: Bytes per pixel (when stored in memory)
> + */
> +struct sun6i_csi_format {
> +	u32				fourcc;
> +	u32				mbus_code;
> +	u8				bpp;
> +};
> +
> +struct sun6i_csi;
> +
> +struct sun6i_video {
> +	struct video_device		vdev;
> +	struct media_pad		pad;
> +	struct sun6i_csi		*csi;
> +
> +	struct mutex			lock;
> +
> +	struct vb2_queue		vb2_vidq;
> +	spinlock_t			dma_queue_lock;
> +	struct list_head		dma_queue;
> +
> +	struct sun6i_csi_buffer		*cur_frm;
> +	unsigned int			sequence;
> +
> +	struct sun6i_csi_format		*formats;
> +	unsigned int			num_formats;
> +	struct sun6i_csi_format		*current_fmt;
> +	struct v4l2_format		fmt;
> +};
> +
> +int sun6i_video_init(struct sun6i_video *video, struct sun6i_csi *csi,
> +		     const char *name);
> +void sun6i_video_cleanup(struct sun6i_video *video);
> +
> +void sun6i_video_frame_done(struct sun6i_video *video);
> +
> +#endif /* __SUN6I_VIDEO_H__ */
> 

Regards,

	Hans

Maxime Ripard Aug. 21, 2017, 8:21 p.m. UTC | #10

Hi Baruch,

On Sun, Jul 30, 2017 at 09:08:01AM +0300, Baruch Siach wrote:
> On Fri, Jul 28, 2017 at 06:02:33PM +0200, Maxime Ripard wrote:
> > Hi, 
> > 
> > Thanks for the second iteration!
> > 
> > On Thu, Jul 27, 2017 at 01:01:35PM +0800, Yong Deng wrote:
> > > Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> > > and CSI1 is used for parallel interface. This is not documented in
> > > datasheet but by testing and guess.
> > > 
> > > This patch implement a v4l2 framework driver for it.
> > > 
> > > Currently, the driver only support the parallel interface. MIPI-CSI2,
> > > ISP's support are not included in this patch.
> > > 
> > > Signed-off-by: Yong Deng <[e-mail]>
> 
> [...]
> 
> > > +#ifdef DEBUG
> > > +static void sun6i_csi_dump_regs(struct sun6i_csi_dev *sdev)
> > > +{
> > > +	struct regmap *regmap = sdev->regmap;
> > > +	u32 val;
> > > +
> > > +	regmap_read(regmap, CSI_EN_REG, &val);
> > > +	printk("CSI_EN_REG=0x%x\n",		val);
> > > +	regmap_read(regmap, CSI_IF_CFG_REG, &val);
> > > +	printk("CSI_IF_CFG_REG=0x%x\n",		val);
> > > +	regmap_read(regmap, CSI_CAP_REG, &val);
> > > +	printk("CSI_CAP_REG=0x%x\n",		val);
> > > +	regmap_read(regmap, CSI_SYNC_CNT_REG, &val);
> > > +	printk("CSI_SYNC_CNT_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_FIFO_THRS_REG, &val);
> > > +	printk("CSI_FIFO_THRS_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_PTN_LEN_REG, &val);
> > > +	printk("CSI_PTN_LEN_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_PTN_ADDR_REG, &val);
> > > +	printk("CSI_PTN_ADDR_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_VER_REG, &val);
> > > +	printk("CSI_VER_REG=0x%x\n",		val);
> > > +	regmap_read(regmap, CSI_CH_CFG_REG, &val);
> > > +	printk("CSI_CH_CFG_REG=0x%x\n",		val);
> > > +	regmap_read(regmap, CSI_CH_SCALE_REG, &val);
> > > +	printk("CSI_CH_SCALE_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_F0_BUFA_REG, &val);
> > > +	printk("CSI_CH_F0_BUFA_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_F1_BUFA_REG, &val);
> > > +	printk("CSI_CH_F1_BUFA_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_F2_BUFA_REG, &val);
> > > +	printk("CSI_CH_F2_BUFA_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_STA_REG, &val);
> > > +	printk("CSI_CH_STA_REG=0x%x\n",		val);
> > > +	regmap_read(regmap, CSI_CH_INT_EN_REG, &val);
> > > +	printk("CSI_CH_INT_EN_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_INT_STA_REG, &val);
> > > +	printk("CSI_CH_INT_STA_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_FLD1_VSIZE_REG, &val);
> > > +	printk("CSI_CH_FLD1_VSIZE_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_HSIZE_REG, &val);
> > > +	printk("CSI_CH_HSIZE_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_VSIZE_REG, &val);
> > > +	printk("CSI_CH_VSIZE_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_BUF_LEN_REG, &val);
> > > +	printk("CSI_CH_BUF_LEN_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_FLIP_SIZE_REG, &val);
> > > +	printk("CSI_CH_FLIP_SIZE_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_FRM_CLK_CNT_REG, &val);
> > > +	printk("CSI_CH_FRM_CLK_CNT_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_ACC_ITNL_CLK_CNT_REG, &val);
> > > +	printk("CSI_CH_ACC_ITNL_CLK_CNT_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_FIFO_STAT_REG, &val);
> > > +	printk("CSI_CH_FIFO_STAT_REG=0x%x\n",	val);
> > > +	regmap_read(regmap, CSI_CH_PCLK_STAT_REG, &val);
> > > +	printk("CSI_CH_PCLK_STAT_REG=0x%x\n",	val);
> > > +}
> > > +#endif
> > 
> > You can already dump a regmap through debugfs, that's redundant.
> 
> The advantage of in-code registers dump routine is the ability to
> synchronize the snapshot with the driver code execution. This is
> particularly important for the capture statistics registers. I have
> found it useful here.

You also have the option to use the traces to do that, but if that's
useful, this should be added to regmap itself. It can benefit others
too.

> > > +static irqreturn_t sun6i_csi_isr(int irq, void *dev_id)
> > > +{
> > > +	struct sun6i_csi_dev *sdev = (struct sun6i_csi_dev *)dev_id;
> > > +	struct regmap *regmap = sdev->regmap;
> > > +	u32 status;
> > > +
> > > +	regmap_read(regmap, CSI_CH_INT_STA_REG, &status);
> > > +
> > > +	if ((status & CSI_CH_INT_STA_FIFO0_OF_PD) ||
> > > +	    (status & CSI_CH_INT_STA_FIFO1_OF_PD) ||
> > > +	    (status & CSI_CH_INT_STA_FIFO2_OF_PD) ||
> > > +	    (status & CSI_CH_INT_STA_HB_OF_PD)) {
> > > +		regmap_write(regmap, CSI_CH_INT_STA_REG, status);
> > > +		regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, 0);
> > > +		regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN,
> > > +				   CSI_EN_CSI_EN);
> > 
> > You need to enable / disable it at every frame? How do you deal with
> > double buffering? (or did you choose to ignore it for now?)
> 
> These *_OF_PD status bits indicate an overflow error condition.

Shouldn't we return an error code then? The names of these flags could
be better too.

Maxime

yong Aug. 22, 2017, 3:01 a.m. UTC | #11

Hi Hans,

On Mon, 21 Aug 2017 16:37:41 +0200
Hans Verkuil <[e-mail]> wrote:

> Hi Yong,
> 
> First two high-level comments before I start the review:
> 
> 1) Can you provide the v4l2-compliance output? I can't merge this unless I
>    see that it passes the compliance tests. Make sure you compile from the git
>    repo (https://git.linuxtv.org/v4l-utils.git/) so you are using the latest
>    version of the compliance test. Test with just 'v4l2-compliance' and also
>    with the -s option (to test streaming) and with the -f option (to test all
>    the various pixel formats).

OK. I will post with the next version.

> 
> 2) I see you support interlaced formats. Did you actually test that? Interlaced
>    is tricky and you shouldn't add support for it unless you know it works and
>    that it passes the 'v4l2-compliance -s' test.

No. I do not have the condition to test the all formats for now. Maybe this can 
be done when ourself's device with V3s is ready in the future months.

> 
> On 07/27/2017 07:01 AM, Yong Deng wrote:
> > Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> > and CSI1 is used for parallel interface. This is not documented in
> > datasheet but by testing and guess.
> > 
> > This patch implement a v4l2 framework driver for it.
> > 
> > Currently, the driver only support the parallel interface. MIPI-CSI2,
> > ISP's support are not included in this patch.
> > 
> > Signed-off-by: Yong Deng <[e-mail]>
> > ---
> >  drivers/media/platform/Kconfig                   |   1 +
> >  drivers/media/platform/Makefile                  |   2 +
> >  drivers/media/platform/sun6i-csi/Kconfig         |   9 +
> >  drivers/media/platform/sun6i-csi/Makefile        |   3 +
> >  drivers/media/platform/sun6i-csi/sun6i_csi.c     | 545 +++++++++++++++
> >  drivers/media/platform/sun6i-csi/sun6i_csi.h     | 203 ++++++
> >  drivers/media/platform/sun6i-csi/sun6i_csi_v3s.c | 827 +++++++++++++++++++++++
> >  drivers/media/platform/sun6i-csi/sun6i_csi_v3s.h | 206 ++++++
> >  drivers/media/platform/sun6i-csi/sun6i_video.c   | 663 ++++++++++++++++++
> >  drivers/media/platform/sun6i-csi/sun6i_video.h   |  61 ++
> >  10 files changed, 2520 insertions(+)
> >  create mode 100644 drivers/media/platform/sun6i-csi/Kconfig
> >  create mode 100644 drivers/media/platform/sun6i-csi/Makefile
> >  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi.c
> >  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi.h
> >  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi_v3s.c
> >  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi_v3s.h
> >  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_video.c
> >  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_video.h
> > 
> 
> <snip>
> 
> > diff --git a/drivers/media/platform/sun6i-csi/sun6i_video.c b/drivers/media/platform/sun6i-csi/sun6i_video.c
> > new file mode 100644
> > index 0000000..0c5dbd2
> > --- /dev/null
> > +++ b/drivers/media/platform/sun6i-csi/sun6i_video.c
> > @@ -0,0 +1,663 @@
> > +/*
> > + * Copyright (c) 2017 Magewell Electronics Co., Ltd. (Nanjing).
> > + * All rights reserved.
> > + * Author: Yong Deng <[e-mail]>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > + * GNU General Public License for more details.
> > + */
> > +
> > +#include <linux/of.h>
> > +
> > +#include <media/v4l2-device.h>
> > +#include <media/v4l2-ioctl.h>
> > +#include <media/v4l2-mc.h>
> > +#include <media/videobuf2-dma-contig.h>
> > +#include <media/videobuf2-v4l2.h>
> > +
> > +#include "sun6i_csi.h"
> > +#include "sun6i_video.h"
> > +
> > +struct sun6i_csi_buffer {
> > +	struct vb2_v4l2_buffer		vb;
> > +	struct list_head		list;
> > +
> > +	dma_addr_t			dma_addr;
> > +};
> > +
> > +static struct sun6i_csi_format *
> > +find_format_by_fourcc(struct sun6i_video *video, unsigned int fourcc)
> > +{
> > +	unsigned int num_formats = video->num_formats;
> > +	struct sun6i_csi_format *fmt;
> > +	unsigned int i;
> > +
> > +	for (i = 0; i < num_formats; i++) {
> > +		fmt = &video->formats[i];
> > +		if (fmt->fourcc == fourcc)
> > +			return fmt;
> > +	}
> > +
> > +	return NULL;
> > +}
> > +
> > +static struct v4l2_subdev *
> > +sun6i_video_remote_subdev(struct sun6i_video *video, u32 *pad)
> > +{
> > +	struct media_pad *remote;
> > +
> > +	remote = media_entity_remote_pad(&video->pad);
> > +
> > +	if (!remote || !is_media_entity_v4l2_subdev(remote->entity))
> > +		return NULL;
> > +
> > +	if (pad)
> > +		*pad = remote->index;
> > +
> > +	return media_entity_to_v4l2_subdev(remote->entity);
> > +}
> > +
> > +static int sun6i_video_queue_setup(struct vb2_queue *vq,
> > +				 unsigned int *nbuffers, unsigned int *nplanes,
> > +				 unsigned int sizes[],
> > +				 struct device *alloc_devs[])
> > +{
> > +	struct sun6i_video *video = vb2_get_drv_priv(vq);
> > +	unsigned int size = video->fmt.fmt.pix.sizeimage;
> > +
> > +	if (*nplanes)
> > +		return sizes[0] < size ? -EINVAL : 0;
> > +
> > +	*nplanes = 1;
> > +	sizes[0] = size;
> > +
> > +	return 0;
> > +}
> > +
> > +static int sun6i_video_buffer_prepare(struct vb2_buffer *vb)
> > +{
> > +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> > +	struct sun6i_csi_buffer *buf =
> > +			container_of(vbuf, struct sun6i_csi_buffer, vb);
> > +	struct sun6i_video *video = vb2_get_drv_priv(vb->vb2_queue);
> > +	unsigned long size = video->fmt.fmt.pix.sizeimage;
> > +
> > +	if (vb2_plane_size(vb, 0) < size) {
> > +		v4l2_err(video->vdev.v4l2_dev, "buffer too small (%lu < %lu)\n",
> > +			 vb2_plane_size(vb, 0), size);
> > +		return -EINVAL;
> > +	}
> > +
> > +	vb2_set_plane_payload(vb, 0, size);
> > +
> > +	buf->dma_addr = vb2_dma_contig_plane_dma_addr(vb, 0);
> > +
> > +	vbuf->field = video->fmt.fmt.pix.field;
> > +
> > +	return 0;
> > +}
> > +
> > +static int sun6i_pipeline_set_stream(struct sun6i_video *video, bool enable)
> > +{
> > +	struct media_entity *entity;
> > +	struct media_pad *pad;
> > +	struct v4l2_subdev *subdev;
> > +	int ret;
> > +
> > +	entity = &video->vdev.entity;
> > +	while (1) {
> > +		pad = &entity->pads[0];
> > +		if (!(pad->flags & MEDIA_PAD_FL_SINK))
> > +			break;
> > +
> > +		pad = media_entity_remote_pad(pad);
> > +		if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
> > +			break;
> > +
> > +		entity = pad->entity;
> > +		subdev = media_entity_to_v4l2_subdev(entity);
> > +
> > +		ret = v4l2_subdev_call(subdev, video, s_stream, enable);
> > +		if (enable && ret < 0 && ret != -ENOIOCTLCMD)
> > +			return ret;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int sun6i_video_start_streaming(struct vb2_queue *vq, unsigned int count)
> > +{
> > +	struct sun6i_video *video = vb2_get_drv_priv(vq);
> > +	struct sun6i_csi_buffer *buf;
> > +	struct sun6i_csi_config config;
> > +	unsigned long flags;
> > +	int ret;
> > +
> > +	video->sequence = 0;
> > +
> > +	ret = media_pipeline_start(&video->vdev.entity, &video->vdev.pipe);
> > +	if (ret < 0)
> > +		goto err_start_pipeline;
> > +
> > +	ret = sun6i_pipeline_set_stream(video, true);
> > +	if (ret < 0)
> > +		goto err_start_stream;
> > +
> > +	config.pixelformat = video->fmt.fmt.pix.pixelformat;
> > +	config.code = video->current_fmt->mbus_code;
> > +	config.field = video->fmt.fmt.pix.field;
> > +	config.width = video->fmt.fmt.pix.width;
> > +	config.height = video->fmt.fmt.pix.height;
> > +
> > +	ret = sun6i_csi_update_config(video->csi, &config);
> > +	if (ret < 0)
> > +		goto err_update_config;
> > +
> > +	spin_lock_irqsave(&video->dma_queue_lock, flags);
> > +	video->cur_frm = list_first_entry(&video->dma_queue,
> > +					  struct sun6i_csi_buffer, list);
> > +	list_del(&video->cur_frm->list);
> > +	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
> > +
> > +	ret = sun6i_csi_update_buf_addr(video->csi, video->cur_frm->dma_addr);
> > +	if (ret < 0)
> > +		goto err_update_addr;
> > +
> > +	ret = sun6i_csi_set_stream(video->csi, true);
> > +	if (ret < 0)
> > +		goto err_csi_stream;
> > +
> > +	return 0;
> > +
> > +err_csi_stream:
> > +err_update_addr:
> > +err_update_config:
> > +	sun6i_pipeline_set_stream(video, false);
> > +err_start_stream:
> > +	media_pipeline_stop(&video->vdev.entity);
> > +err_start_pipeline:
> > +	spin_lock_irqsave(&video->dma_queue_lock, flags);
> > +	list_for_each_entry(buf, &video->dma_queue, list)
> > +		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
> > +	INIT_LIST_HEAD(&video->dma_queue);
> > +	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
> > +
> > +	return ret;
> > +}
> > +
> > +static void sun6i_video_stop_streaming(struct vb2_queue *vq)
> > +{
> > +	struct sun6i_video *video = vb2_get_drv_priv(vq);
> > +	unsigned long flags;
> > +	struct sun6i_csi_buffer *buf;
> > +
> > +	sun6i_pipeline_set_stream(video, false);
> > +
> > +	sun6i_csi_set_stream(video->csi, false);
> > +
> > +	media_pipeline_stop(&video->vdev.entity);
> > +
> > +	/* Release all active buffers */
> > +	spin_lock_irqsave(&video->dma_queue_lock, flags);
> > +	if (unlikely(video->cur_frm)) {
> > +		vb2_buffer_done(&video->cur_frm->vb.vb2_buf,
> > +				VB2_BUF_STATE_ERROR);
> > +		video->cur_frm = NULL;
> > +	}
> > +	list_for_each_entry(buf, &video->dma_queue, list)
> > +		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
> > +	INIT_LIST_HEAD(&video->dma_queue);
> > +	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
> > +}
> > +
> > +static void sun6i_video_buffer_queue(struct vb2_buffer *vb)
> > +{
> > +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> > +	struct sun6i_csi_buffer *buf =
> > +			container_of(vbuf, struct sun6i_csi_buffer, vb);
> > +	struct sun6i_video *video = vb2_get_drv_priv(vb->vb2_queue);
> > +	unsigned long flags;
> > +
> > +	spin_lock_irqsave(&video->dma_queue_lock, flags);
> > +	if (!video->cur_frm && list_empty(&video->dma_queue) &&
> > +		vb2_is_streaming(vb->vb2_queue)) {
> > +		video->cur_frm = buf;
> > +		sun6i_csi_update_buf_addr(video->csi, video->cur_frm->dma_addr);
> > +		sun6i_csi_set_stream(video->csi, 1);
> > +	} else
> > +		list_add_tail(&buf->list, &video->dma_queue);
> > +	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
> > +}
> > +
> > +void sun6i_video_frame_done(struct sun6i_video *video)
> > +{
> > +	spin_lock(&video->dma_queue_lock);
> > +
> > +	if (video->cur_frm) {
> > +		struct vb2_v4l2_buffer *vbuf = &video->cur_frm->vb;
> > +		struct vb2_buffer *vb = &vbuf->vb2_buf;
> > +
> > +		vb->timestamp = ktime_get_ns();
> > +		vbuf->sequence = video->sequence++;
> > +		vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
> > +		video->cur_frm = NULL;
> > +	}
> > +
> > +	if (!list_empty(&video->dma_queue)
> > +	    && vb2_is_streaming(&video->vb2_vidq)) {
> > +		video->cur_frm = list_first_entry(&video->dma_queue,
> > +				struct sun6i_csi_buffer, list);
> > +		list_del(&video->cur_frm->list);
> > +		sun6i_csi_update_buf_addr(video->csi, video->cur_frm->dma_addr);
> > +	} else
> > +		sun6i_csi_set_stream(video->csi, 0);
> > +
> > +	spin_unlock(&video->dma_queue_lock);
> > +}
> > +
> > +static struct vb2_ops sun6i_csi_vb2_ops = {
> > +	.queue_setup		= sun6i_video_queue_setup,
> > +	.wait_prepare		= vb2_ops_wait_prepare,
> > +	.wait_finish		= vb2_ops_wait_finish,
> > +	.buf_prepare		= sun6i_video_buffer_prepare,
> > +	.start_streaming	= sun6i_video_start_streaming,
> > +	.stop_streaming		= sun6i_video_stop_streaming,
> > +	.buf_queue		= sun6i_video_buffer_queue,
> > +};
> > +
> > +static int vidioc_querycap(struct file *file, void *priv,
> > +				struct v4l2_capability *cap)
> > +{
> > +	struct sun6i_video *video = video_drvdata(file);
> > +
> > +	strlcpy(cap->driver, "sun6i-video", sizeof(cap->driver));
> > +	strlcpy(cap->card, video->vdev.name, sizeof(cap->card));
> > +	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
> > +		 video->csi->dev->of_node->name);
> > +
> > +	return 0;
> > +}
> > +
> > +static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
> > +				   struct v4l2_fmtdesc *f)
> > +{
> > +	struct sun6i_video *video = video_drvdata(file);
> > +	u32 index = f->index;
> > +
> > +	if (index >= video->num_formats)
> > +		return -EINVAL;
> > +
> > +	f->pixelformat = video->formats[index].fourcc;
> > +
> > +	return 0;
> > +}
> > +
> > +static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
> > +				struct v4l2_format *fmt)
> > +{
> > +	struct sun6i_video *video = video_drvdata(file);
> > +
> > +	*fmt = video->fmt;
> > +
> > +	return 0;
> > +}
> > +
> > +static int sun6i_video_try_fmt(struct sun6i_video *video, struct v4l2_format *f,
> > +			       struct sun6i_csi_format **current_fmt)
> > +{
> > +	struct sun6i_csi_format *csi_fmt;
> > +	struct v4l2_pix_format *pixfmt = &f->fmt.pix;
> > +	struct v4l2_subdev_format format;
> > +	struct v4l2_subdev *subdev;
> > +	u32 pad;
> > +	int ret;
> > +
> > +	subdev = sun6i_video_remote_subdev(video, &pad);
> > +	if (subdev == NULL)
> > +		return -ENXIO;
> > +
> > +	csi_fmt = find_format_by_fourcc(video, pixfmt->pixelformat);
> > +	if (csi_fmt == NULL)
> > +		return -EINVAL;
> > +
> > +	format.pad = pad;
> > +	format.which = V4L2_SUBDEV_FORMAT_TRY;
> > +	v4l2_fill_mbus_format(&format.format, pixfmt, csi_fmt->mbus_code);
> > +	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &format);
> > +	if (ret)
> > +		return ret;
> > +
> > +	v4l2_fill_pix_format(pixfmt, &format.format);
> > +
> > +	pixfmt->bytesperline = (pixfmt->width * csi_fmt->bpp) >> 3;
> > +	pixfmt->sizeimage = (pixfmt->width * csi_fmt->bpp * pixfmt->height) / 8;
> > +
> > +	if (current_fmt)
> > +		*current_fmt = csi_fmt;
> > +
> > +	return 0;
> > +}
> > +
> > +static int sun6i_video_set_fmt(struct sun6i_video *video, struct v4l2_format *f)
> > +{
> > +	struct v4l2_subdev_format format;
> > +	struct sun6i_csi_format *current_fmt;
> > +	struct v4l2_subdev *subdev;
> > +	u32 pad;
> > +	int ret;
> > +
> > +	subdev = sun6i_video_remote_subdev(video, &pad);
> > +	if (subdev == NULL)
> > +		return -ENXIO;
> > +
> > +	ret = sun6i_video_try_fmt(video, f, &current_fmt);
> > +	if (ret)
> > +		return ret;
> > +
> > +	format.which = V4L2_SUBDEV_FORMAT_ACTIVE;
> > +	v4l2_fill_mbus_format(&format.format, &f->fmt.pix,
> > +			      current_fmt->mbus_code);
> > +	ret = v4l2_subdev_call(subdev, pad, set_fmt, NULL, &format);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	video->fmt = *f;
> > +	video->current_fmt = current_fmt;
> > +
> > +	return 0;
> > +}
> > +
> > +static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
> > +				struct v4l2_format *f)
> > +{
> > +	struct sun6i_video *video = video_drvdata(file);
> > +
> > +	if (vb2_is_streaming(&video->vb2_vidq))
> 
> This should be vb2_is_busy(). Once buffers are allocated you are no longer allowed
> to change the format, regardless of whether you are streaming or not.

OK.

> 
> > +		return -EBUSY;
> > +
> > +	return sun6i_video_set_fmt(video, f);
> > +}
> > +
> > +static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
> > +				  struct v4l2_format *f)
> > +{
> > +	struct sun6i_video *video = video_drvdata(file);
> > +
> > +	return sun6i_video_try_fmt(video, f, NULL);
> > +}
> > +
> > +static const struct v4l2_ioctl_ops sun6i_video_ioctl_ops = {
> > +	.vidioc_querycap		= vidioc_querycap,
> > +	.vidioc_enum_fmt_vid_cap	= vidioc_enum_fmt_vid_cap,
> > +	.vidioc_g_fmt_vid_cap		= vidioc_g_fmt_vid_cap,
> > +	.vidioc_s_fmt_vid_cap		= vidioc_s_fmt_vid_cap,
> > +	.vidioc_try_fmt_vid_cap		= vidioc_try_fmt_vid_cap,
> > +
> > +	.vidioc_reqbufs			= vb2_ioctl_reqbufs,
> > +	.vidioc_querybuf		= vb2_ioctl_querybuf,
> > +	.vidioc_qbuf			= vb2_ioctl_qbuf,
> > +	.vidioc_expbuf			= vb2_ioctl_expbuf,
> > +	.vidioc_dqbuf			= vb2_ioctl_dqbuf,
> > +	.vidioc_create_bufs		= vb2_ioctl_create_bufs,
> > +	.vidioc_prepare_buf		= vb2_ioctl_prepare_buf,
> > +	.vidioc_streamon		= vb2_ioctl_streamon,
> > +	.vidioc_streamoff		= vb2_ioctl_streamoff,
> > +};
> > +
> > +/* -----------------------------------------------------------------------------
> > + * V4L2 file operations
> > + */
> > +static int sun6i_video_open(struct file *file)
> > +{
> > +	struct sun6i_video *video = video_drvdata(file);
> > +	struct v4l2_format format;
> > +	int ret;
> > +
> > +	if (mutex_lock_interruptible(&video->lock))
> > +		return -ERESTARTSYS;
> > +
> > +	ret = v4l2_fh_open(file);
> > +	if (ret < 0)
> > +		goto unlock;
> > +
> > +	ret = v4l2_pipeline_pm_use(&video->vdev.entity, 1);
> > +	if (ret < 0)
> > +		goto fh_release;
> > +
> > +	if (!v4l2_fh_is_singular_file(file))
> > +		goto unlock;
> > +
> > +	ret = sun6i_csi_set_power(video->csi, true);
> > +	if (ret < 0)
> > +		goto fh_release;
> > +
> > +	/* setup default format */
> > +	if (video->num_formats > 0) {
> > +		format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> > +		format.fmt.pix.width = 1280;
> > +		format.fmt.pix.height = 720;
> > +		format.fmt.pix.pixelformat = video->formats[0].fourcc;
> > +		sun6i_video_set_fmt(video, &format);
> > +	}
> 
> No, this should happen when the driver is initialized. The format is
> persistent over open()/close() calls so should not be re-initialized
> here.

OK.

> 
> > +
> > +	mutex_unlock(&video->lock);
> > +	return 0;
> > +
> > +fh_release:
> > +	v4l2_fh_release(file);
> > +unlock:
> > +	mutex_unlock(&video->lock);
> > +	return ret;
> > +}
> > +
> > +static int sun6i_video_close(struct file *file)
> > +{
> > +	struct sun6i_video *video = video_drvdata(file);
> > +	bool last_fh;
> > +
> > +	mutex_lock(&video->lock);
> > +
> > +	last_fh = v4l2_fh_is_singular_file(file);
> > +
> > +	_vb2_fop_release(file, NULL);
> > +
> > +	v4l2_pipeline_pm_use(&video->vdev.entity, 0);
> > +
> > +	if (last_fh)
> > +		sun6i_csi_set_power(video->csi, false);
> > +
> > +	mutex_unlock(&video->lock);
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct v4l2_file_operations sun6i_video_fops = {
> > +	.owner		= THIS_MODULE,
> > +	.open		= sun6i_video_open,
> > +	.release	= sun6i_video_close,
> > +	.unlocked_ioctl	= video_ioctl2,
> > +	.mmap		= vb2_fop_mmap,
> > +	.poll		= vb2_fop_poll
> > +};
> > +
> > +/* -----------------------------------------------------------------------------
> > + * Media Operations
> > + */
> > +static int sun6i_video_formats_init(struct sun6i_video *video)
> > +{
> > +	struct v4l2_subdev_mbus_code_enum mbus_code = { 0 };
> > +	struct sun6i_csi *csi = video->csi;
> > +	struct v4l2_subdev *subdev;
> > +	u32 pad;
> > +	const u32 *pixformats;
> > +	int pixformat_count = 0;
> > +	u32 subdev_codes[32]; /* subdev format codes, 32 should be enough */
> > +	int codes_count = 0;
> > +	int num_fmts = 0;
> > +	int i, j;
> > +
> > +	subdev = sun6i_video_remote_subdev(video, &pad);
> > +	if (subdev == NULL)
> > +		return -ENXIO;
> > +
> > +	/* Get supported pixformats of CSI */
> > +	pixformat_count = sun6i_csi_get_supported_pixformats(csi, &pixformats);
> > +	if (pixformat_count <= 0)
> > +		return -ENXIO;
> > +
> > +	/* Get subdev formats codes */
> > +	mbus_code.pad = pad;
> > +	mbus_code.which = V4L2_SUBDEV_FORMAT_ACTIVE;
> > +	while (!v4l2_subdev_call(subdev, pad, enum_mbus_code, NULL,
> > +			&mbus_code)) {
> > +		subdev_codes[codes_count] = mbus_code.code;
> 
> This definitely needs a check when codes_count >= ARRAY_SIZE(subdev_codes).

OK.

> 
> > +		codes_count++;
> > +		mbus_code.index++;
> > +	}
> > +
> > +	if (!codes_count)
> > +		return -ENXIO;
> > +
> > +	/* Get supported formats count */
> > +	for (i = 0; i < codes_count; i++) {
> > +		for (j = 0; j < pixformat_count; j++) {
> > +			if (!sun6i_csi_is_format_support(csi, pixformats[j],
> > +					mbus_code.code)) {
> > +				continue;
> > +			}
> > +			num_fmts++;
> > +		}
> > +	}
> > +
> > +	if (!num_fmts)
> > +		return -ENXIO;
> > +
> > +	video->num_formats = num_fmts;
> > +	video->formats = devm_kcalloc(video->csi->dev, num_fmts,
> > +			sizeof(struct sun6i_csi_format), GFP_KERNEL);
> > +	if (!video->formats) {
> > +		dev_err(video->csi->dev, "could not allocate memory\n");
> > +		return -ENOMEM;
> > +	}
> > +
> > +	/* Get supported formats */
> > +	num_fmts = 0;
> > +	for (i = 0; i < codes_count; i++) {
> > +		for (j = 0; j < pixformat_count; j++) {
> > +			if (!sun6i_csi_is_format_support(csi, pixformats[j],
> > +					mbus_code.code)) {
> > +				continue;
> > +			}
> > +
> > +			video->formats[num_fmts].fourcc = pixformats[j];
> > +			video->formats[num_fmts].mbus_code =
> > +					mbus_code.code;
> > +			video->formats[num_fmts].bpp =
> > +					v4l2_pixformat_get_bpp(pixformats[j]);
> > +			num_fmts++;
> > +		}
> > +	}
> 
> As mentioned above, the initial format should probably be configure here.

OK.

> 
> > +
> > +	return 0;
> > +}
> > +
> > +static int sun6i_video_link_setup(struct media_entity *entity,
> > +				  const struct media_pad *local,
> > +				  const struct media_pad *remote, u32 flags)
> > +{
> > +	struct video_device *vdev = media_entity_to_video_device(entity);
> > +	struct sun6i_video *video = video_get_drvdata(vdev);
> > +
> > +	if (WARN_ON(video == NULL))
> > +		return 0;
> > +
> > +	return sun6i_video_formats_init(video);
> 
> Why is this called here? Why not in video_init()?

sun6i_video_init is in the driver probe context. sun6i_video_formats_init
use media_entity_remote_pad and media_entity_to_v4l2_subdev to find the
subdevs.
The media_entity_remote_pad can't work before all the media pad linked.

> 
> > +}
> > +
> > +static const struct media_entity_operations sun6i_video_media_ops = {
> > +	.link_setup = sun6i_video_link_setup,
> > +};
> > +
> > +int sun6i_video_init(struct sun6i_video *video, struct sun6i_csi *csi,
> > +		     const char *name)
> > +{
> > +	struct video_device *vdev = &video->vdev;
> > +	struct vb2_queue *vidq = &video->vb2_vidq;
> > +	int ret;
> > +
> > +	video->csi = csi;
> > +
> > +	/* Initialize the media entity... */
> > +	video->pad.flags = MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
> > +	vdev->entity.ops = &sun6i_video_media_ops;
> > +	ret = media_entity_pads_init(&vdev->entity, 1, &video->pad);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	mutex_init(&video->lock);
> > +
> > +	INIT_LIST_HEAD(&video->dma_queue);
> > +	spin_lock_init(&video->dma_queue_lock);
> > +
> > +	video->cur_frm = NULL;
> > +	video->sequence = 0;
> > +	video->num_formats = 0;
> > +
> > +	/* Initialize videobuf2 queue */
> > +	vidq->type			= V4L2_BUF_TYPE_VIDEO_CAPTURE;
> > +	vidq->io_modes			= VB2_MMAP | VB2_DMABUF;
> > +	vidq->drv_priv			= video;
> > +	vidq->buf_struct_size		= sizeof(struct sun6i_csi_buffer);
> > +	vidq->ops			= &sun6i_csi_vb2_ops;
> > +	vidq->mem_ops			= &vb2_dma_contig_memops;
> > +	vidq->timestamp_flags		= V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
> > +	vidq->lock			= &video->lock;
> > +	vidq->min_buffers_needed	= 1;
> > +	vidq->dev			= csi->dev;
> > +
> > +	ret = vb2_queue_init(vidq);
> > +	if (ret) {
> > +		v4l2_err(&csi->v4l2_dev, "vb2_queue_init failed: %d\n", ret);
> > +		goto error;
> > +	}
> > +
> > +	/* Register video device */
> > +	strlcpy(vdev->name, name, sizeof(vdev->name));
> > +	vdev->release		= video_device_release_empty;
> > +	vdev->fops		= &sun6i_video_fops;
> > +	vdev->ioctl_ops		= &sun6i_video_ioctl_ops;
> > +	vdev->vfl_type		= VFL_TYPE_GRABBER;
> > +	vdev->vfl_dir		= VFL_DIR_RX;
> > +	vdev->v4l2_dev		= &csi->v4l2_dev;
> > +	vdev->queue		= vidq;
> > +	vdev->lock		= &video->lock;
> > +	vdev->device_caps	= V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_CAPTURE;
> > +	video_set_drvdata(vdev, video);
> > +
> > +	ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
> > +	if (ret < 0) {
> > +		v4l2_err(&csi->v4l2_dev,
> > +			 "video_register_device failed: %d\n", ret);
> > +		goto error;
> > +	}
> > +
> > +	return 0;
> > +
> > +error:
> > +	sun6i_video_cleanup(video);
> > +	return ret;
> > +}
> > +
> > +void sun6i_video_cleanup(struct sun6i_video *video)
> > +{
> > +	if (video_is_registered(&video->vdev))
> > +		video_unregister_device(&video->vdev);
> > +
> > +	media_entity_cleanup(&video->vdev.entity);
> > +}
> > diff --git a/drivers/media/platform/sun6i-csi/sun6i_video.h b/drivers/media/platform/sun6i-csi/sun6i_video.h
> > new file mode 100644
> > index 0000000..14eac6e
> > --- /dev/null
> > +++ b/drivers/media/platform/sun6i-csi/sun6i_video.h
> > @@ -0,0 +1,61 @@
> > +/*
> > + * Copyright (c) 2017 Yong Deng <[e-mail]>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License as published by
> > + * the Free Software Foundation; either version 2 of the License, or
> > + * (at your option) any later version.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > + * GNU General Public License for more details.
> > + */
> > +
> > +#ifndef __SUN6I_VIDEO_H__
> > +#define __SUN6I_VIDEO_H__
> > +
> > +#include <media/v4l2-dev.h>
> > +#include <media/videobuf2-core.h>
> > +
> > +/*
> > + * struct sun6i_csi_format - CSI media bus format information
> > + * @fourcc: Fourcc code for this format
> > + * @mbus_code: V4L2 media bus format code.
> > + * @bpp: Bytes per pixel (when stored in memory)
> > + */
> > +struct sun6i_csi_format {
> > +	u32				fourcc;
> > +	u32				mbus_code;
> > +	u8				bpp;
> > +};
> > +
> > +struct sun6i_csi;
> > +
> > +struct sun6i_video {
> > +	struct video_device		vdev;
> > +	struct media_pad		pad;
> > +	struct sun6i_csi		*csi;
> > +
> > +	struct mutex			lock;
> > +
> > +	struct vb2_queue		vb2_vidq;
> > +	spinlock_t			dma_queue_lock;
> > +	struct list_head		dma_queue;
> > +
> > +	struct sun6i_csi_buffer		*cur_frm;
> > +	unsigned int			sequence;
> > +
> > +	struct sun6i_csi_format		*formats;
> > +	unsigned int			num_formats;
> > +	struct sun6i_csi_format		*current_fmt;
> > +	struct v4l2_format		fmt;
> > +};
> > +
> > +int sun6i_video_init(struct sun6i_video *video, struct sun6i_csi *csi,
> > +		     const char *name);
> > +void sun6i_video_cleanup(struct sun6i_video *video);
> > +
> > +void sun6i_video_frame_done(struct sun6i_video *video);
> > +
> > +#endif /* __SUN6I_VIDEO_H__ */
> > 
> 
> Regards,
> 
> 	Hans


Thanks,
Yong

Hans Verkuil Aug. 22, 2017, 6:43 a.m. UTC | #12

On 08/22/2017 05:01 AM, Yong wrote:
> Hi Hans,
> 
> On Mon, 21 Aug 2017 16:37:41 +0200
> Hans Verkuil <[e-mail]> wrote:
> 
>> Hi Yong,
>>
>> First two high-level comments before I start the review:
>>
>> 1) Can you provide the v4l2-compliance output? I can't merge this unless I
>>    see that it passes the compliance tests. Make sure you compile from the git
>>    repo (https://git.linuxtv.org/v4l-utils.git/) so you are using the latest
>>    version of the compliance test. Test with just 'v4l2-compliance' and also
>>    with the -s option (to test streaming) and with the -f option (to test all
>>    the various pixel formats).
> 
> OK. I will post with the next version.
> 
>>
>> 2) I see you support interlaced formats. Did you actually test that? Interlaced
>>    is tricky and you shouldn't add support for it unless you know it works and
>>    that it passes the 'v4l2-compliance -s' test.
> 
> No. I do not have the condition to test the all formats for now. Maybe this can 
> be done when ourself's device with V3s is ready in the future months.

Then just drop the interlaced support until you can test it.

> 
>>
>> On 07/27/2017 07:01 AM, Yong Deng wrote:
>>> Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
>>> and CSI1 is used for parallel interface. This is not documented in
>>> datasheet but by testing and guess.
>>>
>>> This patch implement a v4l2 framework driver for it.
>>>
>>> Currently, the driver only support the parallel interface. MIPI-CSI2,
>>> ISP's support are not included in this patch.
>>>
>>> Signed-off-by: Yong Deng <[e-mail]>
>>> ---
>>>  drivers/media/platform/Kconfig                   |   1 +
>>>  drivers/media/platform/Makefile                  |   2 +
>>>  drivers/media/platform/sun6i-csi/Kconfig         |   9 +
>>>  drivers/media/platform/sun6i-csi/Makefile        |   3 +
>>>  drivers/media/platform/sun6i-csi/sun6i_csi.c     | 545 +++++++++++++++
>>>  drivers/media/platform/sun6i-csi/sun6i_csi.h     | 203 ++++++
>>>  drivers/media/platform/sun6i-csi/sun6i_csi_v3s.c | 827 +++++++++++++++++++++++
>>>  drivers/media/platform/sun6i-csi/sun6i_csi_v3s.h | 206 ++++++
>>>  drivers/media/platform/sun6i-csi/sun6i_video.c   | 663 ++++++++++++++++++
>>>  drivers/media/platform/sun6i-csi/sun6i_video.h   |  61 ++
>>>  10 files changed, 2520 insertions(+)
>>>  create mode 100644 drivers/media/platform/sun6i-csi/Kconfig
>>>  create mode 100644 drivers/media/platform/sun6i-csi/Makefile
>>>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi.c
>>>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi.h
>>>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi_v3s.c
>>>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi_v3s.h
>>>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_video.c
>>>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_video.h
>>>
>>
>> <snip>
>>
>>> diff --git a/drivers/media/platform/sun6i-csi/sun6i_video.c b/drivers/media/platform/sun6i-csi/sun6i_video.c
>>> new file mode 100644
>>> index 0000000..0c5dbd2
>>> --- /dev/null
>>> +++ b/drivers/media/platform/sun6i-csi/sun6i_video.c
>>> @@ -0,0 +1,663 @@
>>> +/*
>>> + * Copyright (c) 2017 Magewell Electronics Co., Ltd. (Nanjing).
>>> + * All rights reserved.
>>> + * Author: Yong Deng <[e-mail]>
>>> + *
>>> + * This program is free software; you can redistribute it and/or modify
>>> + * it under the terms of the GNU General Public License version 2 as
>>> + * published by the Free Software Foundation.
>>> + *
>>> + * This program is distributed in the hope that it will be useful,
>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>>> + * GNU General Public License for more details.
>>> + */
>>> +
>>> +#include <linux/of.h>
>>> +
>>> +#include <media/v4l2-device.h>
>>> +#include <media/v4l2-ioctl.h>
>>> +#include <media/v4l2-mc.h>
>>> +#include <media/videobuf2-dma-contig.h>
>>> +#include <media/videobuf2-v4l2.h>
>>> +
>>> +#include "sun6i_csi.h"
>>> +#include "sun6i_video.h"
>>> +
>>> +struct sun6i_csi_buffer {
>>> +	struct vb2_v4l2_buffer		vb;
>>> +	struct list_head		list;
>>> +
>>> +	dma_addr_t			dma_addr;
>>> +};
>>> +
>>> +static struct sun6i_csi_format *
>>> +find_format_by_fourcc(struct sun6i_video *video, unsigned int fourcc)
>>> +{
>>> +	unsigned int num_formats = video->num_formats;
>>> +	struct sun6i_csi_format *fmt;
>>> +	unsigned int i;
>>> +
>>> +	for (i = 0; i < num_formats; i++) {
>>> +		fmt = &video->formats[i];
>>> +		if (fmt->fourcc == fourcc)
>>> +			return fmt;
>>> +	}
>>> +
>>> +	return NULL;
>>> +}
>>> +
>>> +static struct v4l2_subdev *
>>> +sun6i_video_remote_subdev(struct sun6i_video *video, u32 *pad)
>>> +{
>>> +	struct media_pad *remote;
>>> +
>>> +	remote = media_entity_remote_pad(&video->pad);
>>> +
>>> +	if (!remote || !is_media_entity_v4l2_subdev(remote->entity))
>>> +		return NULL;
>>> +
>>> +	if (pad)
>>> +		*pad = remote->index;
>>> +
>>> +	return media_entity_to_v4l2_subdev(remote->entity);
>>> +}
>>> +
>>> +static int sun6i_video_queue_setup(struct vb2_queue *vq,
>>> +				 unsigned int *nbuffers, unsigned int *nplanes,
>>> +				 unsigned int sizes[],
>>> +				 struct device *alloc_devs[])
>>> +{
>>> +	struct sun6i_video *video = vb2_get_drv_priv(vq);
>>> +	unsigned int size = video->fmt.fmt.pix.sizeimage;
>>> +
>>> +	if (*nplanes)
>>> +		return sizes[0] < size ? -EINVAL : 0;
>>> +
>>> +	*nplanes = 1;
>>> +	sizes[0] = size;
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int sun6i_video_buffer_prepare(struct vb2_buffer *vb)
>>> +{
>>> +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
>>> +	struct sun6i_csi_buffer *buf =
>>> +			container_of(vbuf, struct sun6i_csi_buffer, vb);
>>> +	struct sun6i_video *video = vb2_get_drv_priv(vb->vb2_queue);
>>> +	unsigned long size = video->fmt.fmt.pix.sizeimage;
>>> +
>>> +	if (vb2_plane_size(vb, 0) < size) {
>>> +		v4l2_err(video->vdev.v4l2_dev, "buffer too small (%lu < %lu)\n",
>>> +			 vb2_plane_size(vb, 0), size);
>>> +		return -EINVAL;
>>> +	}
>>> +
>>> +	vb2_set_plane_payload(vb, 0, size);
>>> +
>>> +	buf->dma_addr = vb2_dma_contig_plane_dma_addr(vb, 0);
>>> +
>>> +	vbuf->field = video->fmt.fmt.pix.field;
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int sun6i_pipeline_set_stream(struct sun6i_video *video, bool enable)
>>> +{
>>> +	struct media_entity *entity;
>>> +	struct media_pad *pad;
>>> +	struct v4l2_subdev *subdev;
>>> +	int ret;
>>> +
>>> +	entity = &video->vdev.entity;
>>> +	while (1) {
>>> +		pad = &entity->pads[0];
>>> +		if (!(pad->flags & MEDIA_PAD_FL_SINK))
>>> +			break;
>>> +
>>> +		pad = media_entity_remote_pad(pad);
>>> +		if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
>>> +			break;
>>> +
>>> +		entity = pad->entity;
>>> +		subdev = media_entity_to_v4l2_subdev(entity);
>>> +
>>> +		ret = v4l2_subdev_call(subdev, video, s_stream, enable);
>>> +		if (enable && ret < 0 && ret != -ENOIOCTLCMD)
>>> +			return ret;
>>> +	}
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int sun6i_video_start_streaming(struct vb2_queue *vq, unsigned int count)
>>> +{
>>> +	struct sun6i_video *video = vb2_get_drv_priv(vq);
>>> +	struct sun6i_csi_buffer *buf;
>>> +	struct sun6i_csi_config config;
>>> +	unsigned long flags;
>>> +	int ret;
>>> +
>>> +	video->sequence = 0;
>>> +
>>> +	ret = media_pipeline_start(&video->vdev.entity, &video->vdev.pipe);
>>> +	if (ret < 0)
>>> +		goto err_start_pipeline;
>>> +
>>> +	ret = sun6i_pipeline_set_stream(video, true);
>>> +	if (ret < 0)
>>> +		goto err_start_stream;
>>> +
>>> +	config.pixelformat = video->fmt.fmt.pix.pixelformat;
>>> +	config.code = video->current_fmt->mbus_code;
>>> +	config.field = video->fmt.fmt.pix.field;
>>> +	config.width = video->fmt.fmt.pix.width;
>>> +	config.height = video->fmt.fmt.pix.height;
>>> +
>>> +	ret = sun6i_csi_update_config(video->csi, &config);
>>> +	if (ret < 0)
>>> +		goto err_update_config;
>>> +
>>> +	spin_lock_irqsave(&video->dma_queue_lock, flags);
>>> +	video->cur_frm = list_first_entry(&video->dma_queue,
>>> +					  struct sun6i_csi_buffer, list);
>>> +	list_del(&video->cur_frm->list);
>>> +	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
>>> +
>>> +	ret = sun6i_csi_update_buf_addr(video->csi, video->cur_frm->dma_addr);
>>> +	if (ret < 0)
>>> +		goto err_update_addr;
>>> +
>>> +	ret = sun6i_csi_set_stream(video->csi, true);
>>> +	if (ret < 0)
>>> +		goto err_csi_stream;
>>> +
>>> +	return 0;
>>> +
>>> +err_csi_stream:
>>> +err_update_addr:
>>> +err_update_config:
>>> +	sun6i_pipeline_set_stream(video, false);
>>> +err_start_stream:
>>> +	media_pipeline_stop(&video->vdev.entity);
>>> +err_start_pipeline:
>>> +	spin_lock_irqsave(&video->dma_queue_lock, flags);
>>> +	list_for_each_entry(buf, &video->dma_queue, list)
>>> +		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
>>> +	INIT_LIST_HEAD(&video->dma_queue);
>>> +	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
>>> +
>>> +	return ret;
>>> +}
>>> +
>>> +static void sun6i_video_stop_streaming(struct vb2_queue *vq)
>>> +{
>>> +	struct sun6i_video *video = vb2_get_drv_priv(vq);
>>> +	unsigned long flags;
>>> +	struct sun6i_csi_buffer *buf;
>>> +
>>> +	sun6i_pipeline_set_stream(video, false);
>>> +
>>> +	sun6i_csi_set_stream(video->csi, false);
>>> +
>>> +	media_pipeline_stop(&video->vdev.entity);
>>> +
>>> +	/* Release all active buffers */
>>> +	spin_lock_irqsave(&video->dma_queue_lock, flags);
>>> +	if (unlikely(video->cur_frm)) {
>>> +		vb2_buffer_done(&video->cur_frm->vb.vb2_buf,
>>> +				VB2_BUF_STATE_ERROR);
>>> +		video->cur_frm = NULL;
>>> +	}
>>> +	list_for_each_entry(buf, &video->dma_queue, list)
>>> +		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
>>> +	INIT_LIST_HEAD(&video->dma_queue);
>>> +	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
>>> +}
>>> +
>>> +static void sun6i_video_buffer_queue(struct vb2_buffer *vb)
>>> +{
>>> +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
>>> +	struct sun6i_csi_buffer *buf =
>>> +			container_of(vbuf, struct sun6i_csi_buffer, vb);
>>> +	struct sun6i_video *video = vb2_get_drv_priv(vb->vb2_queue);
>>> +	unsigned long flags;
>>> +
>>> +	spin_lock_irqsave(&video->dma_queue_lock, flags);
>>> +	if (!video->cur_frm && list_empty(&video->dma_queue) &&
>>> +		vb2_is_streaming(vb->vb2_queue)) {
>>> +		video->cur_frm = buf;
>>> +		sun6i_csi_update_buf_addr(video->csi, video->cur_frm->dma_addr);
>>> +		sun6i_csi_set_stream(video->csi, 1);
>>> +	} else
>>> +		list_add_tail(&buf->list, &video->dma_queue);
>>> +	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
>>> +}
>>> +
>>> +void sun6i_video_frame_done(struct sun6i_video *video)
>>> +{
>>> +	spin_lock(&video->dma_queue_lock);
>>> +
>>> +	if (video->cur_frm) {
>>> +		struct vb2_v4l2_buffer *vbuf = &video->cur_frm->vb;
>>> +		struct vb2_buffer *vb = &vbuf->vb2_buf;
>>> +
>>> +		vb->timestamp = ktime_get_ns();
>>> +		vbuf->sequence = video->sequence++;
>>> +		vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
>>> +		video->cur_frm = NULL;
>>> +	}
>>> +
>>> +	if (!list_empty(&video->dma_queue)
>>> +	    && vb2_is_streaming(&video->vb2_vidq)) {
>>> +		video->cur_frm = list_first_entry(&video->dma_queue,
>>> +				struct sun6i_csi_buffer, list);
>>> +		list_del(&video->cur_frm->list);
>>> +		sun6i_csi_update_buf_addr(video->csi, video->cur_frm->dma_addr);
>>> +	} else
>>> +		sun6i_csi_set_stream(video->csi, 0);
>>> +
>>> +	spin_unlock(&video->dma_queue_lock);
>>> +}
>>> +
>>> +static struct vb2_ops sun6i_csi_vb2_ops = {
>>> +	.queue_setup		= sun6i_video_queue_setup,
>>> +	.wait_prepare		= vb2_ops_wait_prepare,
>>> +	.wait_finish		= vb2_ops_wait_finish,
>>> +	.buf_prepare		= sun6i_video_buffer_prepare,
>>> +	.start_streaming	= sun6i_video_start_streaming,
>>> +	.stop_streaming		= sun6i_video_stop_streaming,
>>> +	.buf_queue		= sun6i_video_buffer_queue,
>>> +};
>>> +
>>> +static int vidioc_querycap(struct file *file, void *priv,
>>> +				struct v4l2_capability *cap)
>>> +{
>>> +	struct sun6i_video *video = video_drvdata(file);
>>> +
>>> +	strlcpy(cap->driver, "sun6i-video", sizeof(cap->driver));
>>> +	strlcpy(cap->card, video->vdev.name, sizeof(cap->card));
>>> +	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
>>> +		 video->csi->dev->of_node->name);
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
>>> +				   struct v4l2_fmtdesc *f)
>>> +{
>>> +	struct sun6i_video *video = video_drvdata(file);
>>> +	u32 index = f->index;
>>> +
>>> +	if (index >= video->num_formats)
>>> +		return -EINVAL;
>>> +
>>> +	f->pixelformat = video->formats[index].fourcc;
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
>>> +				struct v4l2_format *fmt)
>>> +{
>>> +	struct sun6i_video *video = video_drvdata(file);
>>> +
>>> +	*fmt = video->fmt;
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int sun6i_video_try_fmt(struct sun6i_video *video, struct v4l2_format *f,
>>> +			       struct sun6i_csi_format **current_fmt)
>>> +{
>>> +	struct sun6i_csi_format *csi_fmt;
>>> +	struct v4l2_pix_format *pixfmt = &f->fmt.pix;
>>> +	struct v4l2_subdev_format format;
>>> +	struct v4l2_subdev *subdev;
>>> +	u32 pad;
>>> +	int ret;
>>> +
>>> +	subdev = sun6i_video_remote_subdev(video, &pad);
>>> +	if (subdev == NULL)
>>> +		return -ENXIO;
>>> +
>>> +	csi_fmt = find_format_by_fourcc(video, pixfmt->pixelformat);
>>> +	if (csi_fmt == NULL)
>>> +		return -EINVAL;
>>> +
>>> +	format.pad = pad;
>>> +	format.which = V4L2_SUBDEV_FORMAT_TRY;
>>> +	v4l2_fill_mbus_format(&format.format, pixfmt, csi_fmt->mbus_code);
>>> +	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &format);
>>> +	if (ret)
>>> +		return ret;
>>> +
>>> +	v4l2_fill_pix_format(pixfmt, &format.format);
>>> +
>>> +	pixfmt->bytesperline = (pixfmt->width * csi_fmt->bpp) >> 3;
>>> +	pixfmt->sizeimage = (pixfmt->width * csi_fmt->bpp * pixfmt->height) / 8;
>>> +
>>> +	if (current_fmt)
>>> +		*current_fmt = csi_fmt;
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int sun6i_video_set_fmt(struct sun6i_video *video, struct v4l2_format *f)
>>> +{
>>> +	struct v4l2_subdev_format format;
>>> +	struct sun6i_csi_format *current_fmt;
>>> +	struct v4l2_subdev *subdev;
>>> +	u32 pad;
>>> +	int ret;
>>> +
>>> +	subdev = sun6i_video_remote_subdev(video, &pad);
>>> +	if (subdev == NULL)
>>> +		return -ENXIO;
>>> +
>>> +	ret = sun6i_video_try_fmt(video, f, &current_fmt);
>>> +	if (ret)
>>> +		return ret;
>>> +
>>> +	format.which = V4L2_SUBDEV_FORMAT_ACTIVE;
>>> +	v4l2_fill_mbus_format(&format.format, &f->fmt.pix,
>>> +			      current_fmt->mbus_code);
>>> +	ret = v4l2_subdev_call(subdev, pad, set_fmt, NULL, &format);
>>> +	if (ret < 0)
>>> +		return ret;
>>> +
>>> +	video->fmt = *f;
>>> +	video->current_fmt = current_fmt;
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
>>> +				struct v4l2_format *f)
>>> +{
>>> +	struct sun6i_video *video = video_drvdata(file);
>>> +
>>> +	if (vb2_is_streaming(&video->vb2_vidq))
>>
>> This should be vb2_is_busy(). Once buffers are allocated you are no longer allowed
>> to change the format, regardless of whether you are streaming or not.
> 
> OK.
> 
>>
>>> +		return -EBUSY;
>>> +
>>> +	return sun6i_video_set_fmt(video, f);
>>> +}
>>> +
>>> +static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
>>> +				  struct v4l2_format *f)
>>> +{
>>> +	struct sun6i_video *video = video_drvdata(file);
>>> +
>>> +	return sun6i_video_try_fmt(video, f, NULL);
>>> +}
>>> +
>>> +static const struct v4l2_ioctl_ops sun6i_video_ioctl_ops = {
>>> +	.vidioc_querycap		= vidioc_querycap,
>>> +	.vidioc_enum_fmt_vid_cap	= vidioc_enum_fmt_vid_cap,
>>> +	.vidioc_g_fmt_vid_cap		= vidioc_g_fmt_vid_cap,
>>> +	.vidioc_s_fmt_vid_cap		= vidioc_s_fmt_vid_cap,
>>> +	.vidioc_try_fmt_vid_cap		= vidioc_try_fmt_vid_cap,
>>> +
>>> +	.vidioc_reqbufs			= vb2_ioctl_reqbufs,
>>> +	.vidioc_querybuf		= vb2_ioctl_querybuf,
>>> +	.vidioc_qbuf			= vb2_ioctl_qbuf,
>>> +	.vidioc_expbuf			= vb2_ioctl_expbuf,
>>> +	.vidioc_dqbuf			= vb2_ioctl_dqbuf,
>>> +	.vidioc_create_bufs		= vb2_ioctl_create_bufs,
>>> +	.vidioc_prepare_buf		= vb2_ioctl_prepare_buf,
>>> +	.vidioc_streamon		= vb2_ioctl_streamon,
>>> +	.vidioc_streamoff		= vb2_ioctl_streamoff,
>>> +};
>>> +
>>> +/* -----------------------------------------------------------------------------
>>> + * V4L2 file operations
>>> + */
>>> +static int sun6i_video_open(struct file *file)
>>> +{
>>> +	struct sun6i_video *video = video_drvdata(file);
>>> +	struct v4l2_format format;
>>> +	int ret;
>>> +
>>> +	if (mutex_lock_interruptible(&video->lock))
>>> +		return -ERESTARTSYS;
>>> +
>>> +	ret = v4l2_fh_open(file);
>>> +	if (ret < 0)
>>> +		goto unlock;
>>> +
>>> +	ret = v4l2_pipeline_pm_use(&video->vdev.entity, 1);
>>> +	if (ret < 0)
>>> +		goto fh_release;
>>> +
>>> +	if (!v4l2_fh_is_singular_file(file))
>>> +		goto unlock;
>>> +
>>> +	ret = sun6i_csi_set_power(video->csi, true);
>>> +	if (ret < 0)
>>> +		goto fh_release;
>>> +
>>> +	/* setup default format */
>>> +	if (video->num_formats > 0) {
>>> +		format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
>>> +		format.fmt.pix.width = 1280;
>>> +		format.fmt.pix.height = 720;
>>> +		format.fmt.pix.pixelformat = video->formats[0].fourcc;
>>> +		sun6i_video_set_fmt(video, &format);
>>> +	}
>>
>> No, this should happen when the driver is initialized. The format is
>> persistent over open()/close() calls so should not be re-initialized
>> here.
> 
> OK.
> 
>>
>>> +
>>> +	mutex_unlock(&video->lock);
>>> +	return 0;
>>> +
>>> +fh_release:
>>> +	v4l2_fh_release(file);
>>> +unlock:
>>> +	mutex_unlock(&video->lock);
>>> +	return ret;
>>> +}
>>> +
>>> +static int sun6i_video_close(struct file *file)
>>> +{
>>> +	struct sun6i_video *video = video_drvdata(file);
>>> +	bool last_fh;
>>> +
>>> +	mutex_lock(&video->lock);
>>> +
>>> +	last_fh = v4l2_fh_is_singular_file(file);
>>> +
>>> +	_vb2_fop_release(file, NULL);
>>> +
>>> +	v4l2_pipeline_pm_use(&video->vdev.entity, 0);
>>> +
>>> +	if (last_fh)
>>> +		sun6i_csi_set_power(video->csi, false);
>>> +
>>> +	mutex_unlock(&video->lock);
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static const struct v4l2_file_operations sun6i_video_fops = {
>>> +	.owner		= THIS_MODULE,
>>> +	.open		= sun6i_video_open,
>>> +	.release	= sun6i_video_close,
>>> +	.unlocked_ioctl	= video_ioctl2,
>>> +	.mmap		= vb2_fop_mmap,
>>> +	.poll		= vb2_fop_poll
>>> +};
>>> +
>>> +/* -----------------------------------------------------------------------------
>>> + * Media Operations
>>> + */
>>> +static int sun6i_video_formats_init(struct sun6i_video *video)
>>> +{
>>> +	struct v4l2_subdev_mbus_code_enum mbus_code = { 0 };
>>> +	struct sun6i_csi *csi = video->csi;
>>> +	struct v4l2_subdev *subdev;
>>> +	u32 pad;
>>> +	const u32 *pixformats;
>>> +	int pixformat_count = 0;
>>> +	u32 subdev_codes[32]; /* subdev format codes, 32 should be enough */
>>> +	int codes_count = 0;
>>> +	int num_fmts = 0;
>>> +	int i, j;
>>> +
>>> +	subdev = sun6i_video_remote_subdev(video, &pad);
>>> +	if (subdev == NULL)
>>> +		return -ENXIO;
>>> +
>>> +	/* Get supported pixformats of CSI */
>>> +	pixformat_count = sun6i_csi_get_supported_pixformats(csi, &pixformats);
>>> +	if (pixformat_count <= 0)
>>> +		return -ENXIO;
>>> +
>>> +	/* Get subdev formats codes */
>>> +	mbus_code.pad = pad;
>>> +	mbus_code.which = V4L2_SUBDEV_FORMAT_ACTIVE;
>>> +	while (!v4l2_subdev_call(subdev, pad, enum_mbus_code, NULL,
>>> +			&mbus_code)) {
>>> +		subdev_codes[codes_count] = mbus_code.code;
>>
>> This definitely needs a check when codes_count >= ARRAY_SIZE(subdev_codes).
> 
> OK.
> 
>>
>>> +		codes_count++;
>>> +		mbus_code.index++;
>>> +	}
>>> +
>>> +	if (!codes_count)
>>> +		return -ENXIO;
>>> +
>>> +	/* Get supported formats count */
>>> +	for (i = 0; i < codes_count; i++) {
>>> +		for (j = 0; j < pixformat_count; j++) {
>>> +			if (!sun6i_csi_is_format_support(csi, pixformats[j],
>>> +					mbus_code.code)) {
>>> +				continue;
>>> +			}
>>> +			num_fmts++;
>>> +		}
>>> +	}
>>> +
>>> +	if (!num_fmts)
>>> +		return -ENXIO;
>>> +
>>> +	video->num_formats = num_fmts;
>>> +	video->formats = devm_kcalloc(video->csi->dev, num_fmts,
>>> +			sizeof(struct sun6i_csi_format), GFP_KERNEL);
>>> +	if (!video->formats) {
>>> +		dev_err(video->csi->dev, "could not allocate memory\n");
>>> +		return -ENOMEM;
>>> +	}
>>> +
>>> +	/* Get supported formats */
>>> +	num_fmts = 0;
>>> +	for (i = 0; i < codes_count; i++) {
>>> +		for (j = 0; j < pixformat_count; j++) {
>>> +			if (!sun6i_csi_is_format_support(csi, pixformats[j],
>>> +					mbus_code.code)) {
>>> +				continue;
>>> +			}
>>> +
>>> +			video->formats[num_fmts].fourcc = pixformats[j];
>>> +			video->formats[num_fmts].mbus_code =
>>> +					mbus_code.code;
>>> +			video->formats[num_fmts].bpp =
>>> +					v4l2_pixformat_get_bpp(pixformats[j]);
>>> +			num_fmts++;
>>> +		}
>>> +	}
>>
>> As mentioned above, the initial format should probably be configure here.
> 
> OK.
> 
>>
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int sun6i_video_link_setup(struct media_entity *entity,
>>> +				  const struct media_pad *local,
>>> +				  const struct media_pad *remote, u32 flags)
>>> +{
>>> +	struct video_device *vdev = media_entity_to_video_device(entity);
>>> +	struct sun6i_video *video = video_get_drvdata(vdev);
>>> +
>>> +	if (WARN_ON(video == NULL))
>>> +		return 0;
>>> +
>>> +	return sun6i_video_formats_init(video);
>>
>> Why is this called here? Why not in video_init()?
> 
> sun6i_video_init is in the driver probe context. sun6i_video_formats_init
> use media_entity_remote_pad and media_entity_to_v4l2_subdev to find the
> subdevs.
> The media_entity_remote_pad can't work before all the media pad linked.

A video_init is typically called from the notify_complete callback.
Actually, that's where the video_register_device should be created as well.
When you create it in probe() there is possibly no sensor yet, so it would
be a dead video node (or worse, crash when used).

There are still a lot of platform drivers that create the video node in the
probe, but it's not the right place if you rely on the async loading of
subdevs.

Regards,

	Hans

Regards,

	Hans

yong Aug. 22, 2017, 7:51 a.m. UTC | #13

On Tue, 22 Aug 2017 08:43:35 +0200
Hans Verkuil <[e-mail]> wrote:

> On 08/22/2017 05:01 AM, Yong wrote:
> > Hi Hans,
> > 
> > On Mon, 21 Aug 2017 16:37:41 +0200
> > Hans Verkuil <[e-mail]> wrote:
> > 
> >> Hi Yong,
> >>
> >> First two high-level comments before I start the review:
> >>
> >> 1) Can you provide the v4l2-compliance output? I can't merge this unless I
> >>    see that it passes the compliance tests. Make sure you compile from the git
> >>    repo (https://git.linuxtv.org/v4l-utils.git/) so you are using the latest
> >>    version of the compliance test. Test with just 'v4l2-compliance' and also
> >>    with the -s option (to test streaming) and with the -f option (to test all
> >>    the various pixel formats).
> > 
> > OK. I will post with the next version.
> > 
> >>
> >> 2) I see you support interlaced formats. Did you actually test that? Interlaced
> >>    is tricky and you shouldn't add support for it unless you know it works and
> >>    that it passes the 'v4l2-compliance -s' test.
> > 
> > No. I do not have the condition to test the all formats for now. Maybe this can 
> > be done when ourself's device with V3s is ready in the future months.
> 
> Then just drop the interlaced support until you can test it.

OK. I will try to find a way to test it. If not, I will drop it.

> 
> > 
> >>
> >> On 07/27/2017 07:01 AM, Yong Deng wrote:
> >>> Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> >>> and CSI1 is used for parallel interface. This is not documented in
> >>> datasheet but by testing and guess.
> >>>
> >>> This patch implement a v4l2 framework driver for it.
> >>>
> >>> Currently, the driver only support the parallel interface. MIPI-CSI2,
> >>> ISP's support are not included in this patch.
> >>>
> >>> Signed-off-by: Yong Deng <[e-mail]>
> >>> ---
> >>>  drivers/media/platform/Kconfig                   |   1 +
> >>>  drivers/media/platform/Makefile                  |   2 +
> >>>  drivers/media/platform/sun6i-csi/Kconfig         |   9 +
> >>>  drivers/media/platform/sun6i-csi/Makefile        |   3 +
> >>>  drivers/media/platform/sun6i-csi/sun6i_csi.c     | 545 +++++++++++++++
> >>>  drivers/media/platform/sun6i-csi/sun6i_csi.h     | 203 ++++++
> >>>  drivers/media/platform/sun6i-csi/sun6i_csi_v3s.c | 827 +++++++++++++++++++++++
> >>>  drivers/media/platform/sun6i-csi/sun6i_csi_v3s.h | 206 ++++++
> >>>  drivers/media/platform/sun6i-csi/sun6i_video.c   | 663 ++++++++++++++++++
> >>>  drivers/media/platform/sun6i-csi/sun6i_video.h   |  61 ++
> >>>  10 files changed, 2520 insertions(+)
> >>>  create mode 100644 drivers/media/platform/sun6i-csi/Kconfig
> >>>  create mode 100644 drivers/media/platform/sun6i-csi/Makefile
> >>>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi.c
> >>>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi.h
> >>>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi_v3s.c
> >>>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_csi_v3s.h
> >>>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_video.c
> >>>  create mode 100644 drivers/media/platform/sun6i-csi/sun6i_video.h
> >>>
> >>
> >> <snip>
> >>
> >>> diff --git a/drivers/media/platform/sun6i-csi/sun6i_video.c b/drivers/media/platform/sun6i-csi/sun6i_video.c
> >>> new file mode 100644
> >>> index 0000000..0c5dbd2
> >>> --- /dev/null
> >>> +++ b/drivers/media/platform/sun6i-csi/sun6i_video.c
> >>> @@ -0,0 +1,663 @@
> >>> +/*
> >>> + * Copyright (c) 2017 Magewell Electronics Co., Ltd. (Nanjing).
> >>> + * All rights reserved.
> >>> + * Author: Yong Deng <[e-mail]>
> >>> + *
> >>> + * This program is free software; you can redistribute it and/or modify
> >>> + * it under the terms of the GNU General Public License version 2 as
> >>> + * published by the Free Software Foundation.
> >>> + *
> >>> + * This program is distributed in the hope that it will be useful,
> >>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> >>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> >>> + * GNU General Public License for more details.
> >>> + */
> >>> +
> >>> +#include <linux/of.h>
> >>> +
> >>> +#include <media/v4l2-device.h>
> >>> +#include <media/v4l2-ioctl.h>
> >>> +#include <media/v4l2-mc.h>
> >>> +#include <media/videobuf2-dma-contig.h>
> >>> +#include <media/videobuf2-v4l2.h>
> >>> +
> >>> +#include "sun6i_csi.h"
> >>> +#include "sun6i_video.h"
> >>> +
> >>> +struct sun6i_csi_buffer {
> >>> +	struct vb2_v4l2_buffer		vb;
> >>> +	struct list_head		list;
> >>> +
> >>> +	dma_addr_t			dma_addr;
> >>> +};
> >>> +
> >>> +static struct sun6i_csi_format *
> >>> +find_format_by_fourcc(struct sun6i_video *video, unsigned int fourcc)
> >>> +{
> >>> +	unsigned int num_formats = video->num_formats;
> >>> +	struct sun6i_csi_format *fmt;
> >>> +	unsigned int i;
> >>> +
> >>> +	for (i = 0; i < num_formats; i++) {
> >>> +		fmt = &video->formats[i];
> >>> +		if (fmt->fourcc == fourcc)
> >>> +			return fmt;
> >>> +	}
> >>> +
> >>> +	return NULL;
> >>> +}
> >>> +
> >>> +static struct v4l2_subdev *
> >>> +sun6i_video_remote_subdev(struct sun6i_video *video, u32 *pad)
> >>> +{
> >>> +	struct media_pad *remote;
> >>> +
> >>> +	remote = media_entity_remote_pad(&video->pad);
> >>> +
> >>> +	if (!remote || !is_media_entity_v4l2_subdev(remote->entity))
> >>> +		return NULL;
> >>> +
> >>> +	if (pad)
> >>> +		*pad = remote->index;
> >>> +
> >>> +	return media_entity_to_v4l2_subdev(remote->entity);
> >>> +}
> >>> +
> >>> +static int sun6i_video_queue_setup(struct vb2_queue *vq,
> >>> +				 unsigned int *nbuffers, unsigned int *nplanes,
> >>> +				 unsigned int sizes[],
> >>> +				 struct device *alloc_devs[])
> >>> +{
> >>> +	struct sun6i_video *video = vb2_get_drv_priv(vq);
> >>> +	unsigned int size = video->fmt.fmt.pix.sizeimage;
> >>> +
> >>> +	if (*nplanes)
> >>> +		return sizes[0] < size ? -EINVAL : 0;
> >>> +
> >>> +	*nplanes = 1;
> >>> +	sizes[0] = size;
> >>> +
> >>> +	return 0;
> >>> +}
> >>> +
> >>> +static int sun6i_video_buffer_prepare(struct vb2_buffer *vb)
> >>> +{
> >>> +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> >>> +	struct sun6i_csi_buffer *buf =
> >>> +			container_of(vbuf, struct sun6i_csi_buffer, vb);
> >>> +	struct sun6i_video *video = vb2_get_drv_priv(vb->vb2_queue);
> >>> +	unsigned long size = video->fmt.fmt.pix.sizeimage;
> >>> +
> >>> +	if (vb2_plane_size(vb, 0) < size) {
> >>> +		v4l2_err(video->vdev.v4l2_dev, "buffer too small (%lu < %lu)\n",
> >>> +			 vb2_plane_size(vb, 0), size);
> >>> +		return -EINVAL;
> >>> +	}
> >>> +
> >>> +	vb2_set_plane_payload(vb, 0, size);
> >>> +
> >>> +	buf->dma_addr = vb2_dma_contig_plane_dma_addr(vb, 0);
> >>> +
> >>> +	vbuf->field = video->fmt.fmt.pix.field;
> >>> +
> >>> +	return 0;
> >>> +}
> >>> +
> >>> +static int sun6i_pipeline_set_stream(struct sun6i_video *video, bool enable)
> >>> +{
> >>> +	struct media_entity *entity;
> >>> +	struct media_pad *pad;
> >>> +	struct v4l2_subdev *subdev;
> >>> +	int ret;
> >>> +
> >>> +	entity = &video->vdev.entity;
> >>> +	while (1) {
> >>> +		pad = &entity->pads[0];
> >>> +		if (!(pad->flags & MEDIA_PAD_FL_SINK))
> >>> +			break;
> >>> +
> >>> +		pad = media_entity_remote_pad(pad);
> >>> +		if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
> >>> +			break;
> >>> +
> >>> +		entity = pad->entity;
> >>> +		subdev = media_entity_to_v4l2_subdev(entity);
> >>> +
> >>> +		ret = v4l2_subdev_call(subdev, video, s_stream, enable);
> >>> +		if (enable && ret < 0 && ret != -ENOIOCTLCMD)
> >>> +			return ret;
> >>> +	}
> >>> +
> >>> +	return 0;
> >>> +}
> >>> +
> >>> +static int sun6i_video_start_streaming(struct vb2_queue *vq, unsigned int count)
> >>> +{
> >>> +	struct sun6i_video *video = vb2_get_drv_priv(vq);
> >>> +	struct sun6i_csi_buffer *buf;
> >>> +	struct sun6i_csi_config config;
> >>> +	unsigned long flags;
> >>> +	int ret;
> >>> +
> >>> +	video->sequence = 0;
> >>> +
> >>> +	ret = media_pipeline_start(&video->vdev.entity, &video->vdev.pipe);
> >>> +	if (ret < 0)
> >>> +		goto err_start_pipeline;
> >>> +
> >>> +	ret = sun6i_pipeline_set_stream(video, true);
> >>> +	if (ret < 0)
> >>> +		goto err_start_stream;
> >>> +
> >>> +	config.pixelformat = video->fmt.fmt.pix.pixelformat;
> >>> +	config.code = video->current_fmt->mbus_code;
> >>> +	config.field = video->fmt.fmt.pix.field;
> >>> +	config.width = video->fmt.fmt.pix.width;
> >>> +	config.height = video->fmt.fmt.pix.height;
> >>> +
> >>> +	ret = sun6i_csi_update_config(video->csi, &config);
> >>> +	if (ret < 0)
> >>> +		goto err_update_config;
> >>> +
> >>> +	spin_lock_irqsave(&video->dma_queue_lock, flags);
> >>> +	video->cur_frm = list_first_entry(&video->dma_queue,
> >>> +					  struct sun6i_csi_buffer, list);
> >>> +	list_del(&video->cur_frm->list);
> >>> +	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
> >>> +
> >>> +	ret = sun6i_csi_update_buf_addr(video->csi, video->cur_frm->dma_addr);
> >>> +	if (ret < 0)
> >>> +		goto err_update_addr;
> >>> +
> >>> +	ret = sun6i_csi_set_stream(video->csi, true);
> >>> +	if (ret < 0)
> >>> +		goto err_csi_stream;
> >>> +
> >>> +	return 0;
> >>> +
> >>> +err_csi_stream:
> >>> +err_update_addr:
> >>> +err_update_config:
> >>> +	sun6i_pipeline_set_stream(video, false);
> >>> +err_start_stream:
> >>> +	media_pipeline_stop(&video->vdev.entity);
> >>> +err_start_pipeline:
> >>> +	spin_lock_irqsave(&video->dma_queue_lock, flags);
> >>> +	list_for_each_entry(buf, &video->dma_queue, list)
> >>> +		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
> >>> +	INIT_LIST_HEAD(&video->dma_queue);
> >>> +	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
> >>> +
> >>> +	return ret;
> >>> +}
> >>> +
> >>> +static void sun6i_video_stop_streaming(struct vb2_queue *vq)
> >>> +{
> >>> +	struct sun6i_video *video = vb2_get_drv_priv(vq);
> >>> +	unsigned long flags;
> >>> +	struct sun6i_csi_buffer *buf;
> >>> +
> >>> +	sun6i_pipeline_set_stream(video, false);
> >>> +
> >>> +	sun6i_csi_set_stream(video->csi, false);
> >>> +
> >>> +	media_pipeline_stop(&video->vdev.entity);
> >>> +
> >>> +	/* Release all active buffers */
> >>> +	spin_lock_irqsave(&video->dma_queue_lock, flags);
> >>> +	if (unlikely(video->cur_frm)) {
> >>> +		vb2_buffer_done(&video->cur_frm->vb.vb2_buf,
> >>> +				VB2_BUF_STATE_ERROR);
> >>> +		video->cur_frm = NULL;
> >>> +	}
> >>> +	list_for_each_entry(buf, &video->dma_queue, list)
> >>> +		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
> >>> +	INIT_LIST_HEAD(&video->dma_queue);
> >>> +	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
> >>> +}
> >>> +
> >>> +static void sun6i_video_buffer_queue(struct vb2_buffer *vb)
> >>> +{
> >>> +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> >>> +	struct sun6i_csi_buffer *buf =
> >>> +			container_of(vbuf, struct sun6i_csi_buffer, vb);
> >>> +	struct sun6i_video *video = vb2_get_drv_priv(vb->vb2_queue);
> >>> +	unsigned long flags;
> >>> +
> >>> +	spin_lock_irqsave(&video->dma_queue_lock, flags);
> >>> +	if (!video->cur_frm && list_empty(&video->dma_queue) &&
> >>> +		vb2_is_streaming(vb->vb2_queue)) {
> >>> +		video->cur_frm = buf;
> >>> +		sun6i_csi_update_buf_addr(video->csi, video->cur_frm->dma_addr);
> >>> +		sun6i_csi_set_stream(video->csi, 1);
> >>> +	} else
> >>> +		list_add_tail(&buf->list, &video->dma_queue);
> >>> +	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
> >>> +}
> >>> +
> >>> +void sun6i_video_frame_done(struct sun6i_video *video)
> >>> +{
> >>> +	spin_lock(&video->dma_queue_lock);
> >>> +
> >>> +	if (video->cur_frm) {
> >>> +		struct vb2_v4l2_buffer *vbuf = &video->cur_frm->vb;
> >>> +		struct vb2_buffer *vb = &vbuf->vb2_buf;
> >>> +
> >>> +		vb->timestamp = ktime_get_ns();
> >>> +		vbuf->sequence = video->sequence++;
> >>> +		vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
> >>> +		video->cur_frm = NULL;
> >>> +	}
> >>> +
> >>> +	if (!list_empty(&video->dma_queue)
> >>> +	    && vb2_is_streaming(&video->vb2_vidq)) {
> >>> +		video->cur_frm = list_first_entry(&video->dma_queue,
> >>> +				struct sun6i_csi_buffer, list);
> >>> +		list_del(&video->cur_frm->list);
> >>> +		sun6i_csi_update_buf_addr(video->csi, video->cur_frm->dma_addr);
> >>> +	} else
> >>> +		sun6i_csi_set_stream(video->csi, 0);
> >>> +
> >>> +	spin_unlock(&video->dma_queue_lock);
> >>> +}
> >>> +
> >>> +static struct vb2_ops sun6i_csi_vb2_ops = {
> >>> +	.queue_setup		= sun6i_video_queue_setup,
> >>> +	.wait_prepare		= vb2_ops_wait_prepare,
> >>> +	.wait_finish		= vb2_ops_wait_finish,
> >>> +	.buf_prepare		= sun6i_video_buffer_prepare,
> >>> +	.start_streaming	= sun6i_video_start_streaming,
> >>> +	.stop_streaming		= sun6i_video_stop_streaming,
> >>> +	.buf_queue		= sun6i_video_buffer_queue,
> >>> +};
> >>> +
> >>> +static int vidioc_querycap(struct file *file, void *priv,
> >>> +				struct v4l2_capability *cap)
> >>> +{
> >>> +	struct sun6i_video *video = video_drvdata(file);
> >>> +
> >>> +	strlcpy(cap->driver, "sun6i-video", sizeof(cap->driver));
> >>> +	strlcpy(cap->card, video->vdev.name, sizeof(cap->card));
> >>> +	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
> >>> +		 video->csi->dev->of_node->name);
> >>> +
> >>> +	return 0;
> >>> +}
> >>> +
> >>> +static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
> >>> +				   struct v4l2_fmtdesc *f)
> >>> +{
> >>> +	struct sun6i_video *video = video_drvdata(file);
> >>> +	u32 index = f->index;
> >>> +
> >>> +	if (index >= video->num_formats)
> >>> +		return -EINVAL;
> >>> +
> >>> +	f->pixelformat = video->formats[index].fourcc;
> >>> +
> >>> +	return 0;
> >>> +}
> >>> +
> >>> +static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
> >>> +				struct v4l2_format *fmt)
> >>> +{
> >>> +	struct sun6i_video *video = video_drvdata(file);
> >>> +
> >>> +	*fmt = video->fmt;
> >>> +
> >>> +	return 0;
> >>> +}
> >>> +
> >>> +static int sun6i_video_try_fmt(struct sun6i_video *video, struct v4l2_format *f,
> >>> +			       struct sun6i_csi_format **current_fmt)
> >>> +{
> >>> +	struct sun6i_csi_format *csi_fmt;
> >>> +	struct v4l2_pix_format *pixfmt = &f->fmt.pix;
> >>> +	struct v4l2_subdev_format format;
> >>> +	struct v4l2_subdev *subdev;
> >>> +	u32 pad;
> >>> +	int ret;
> >>> +
> >>> +	subdev = sun6i_video_remote_subdev(video, &pad);
> >>> +	if (subdev == NULL)
> >>> +		return -ENXIO;
> >>> +
> >>> +	csi_fmt = find_format_by_fourcc(video, pixfmt->pixelformat);
> >>> +	if (csi_fmt == NULL)
> >>> +		return -EINVAL;
> >>> +
> >>> +	format.pad = pad;
> >>> +	format.which = V4L2_SUBDEV_FORMAT_TRY;
> >>> +	v4l2_fill_mbus_format(&format.format, pixfmt, csi_fmt->mbus_code);
> >>> +	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &format);
> >>> +	if (ret)
> >>> +		return ret;
> >>> +
> >>> +	v4l2_fill_pix_format(pixfmt, &format.format);
> >>> +
> >>> +	pixfmt->bytesperline = (pixfmt->width * csi_fmt->bpp) >> 3;
> >>> +	pixfmt->sizeimage = (pixfmt->width * csi_fmt->bpp * pixfmt->height) / 8;
> >>> +
> >>> +	if (current_fmt)
> >>> +		*current_fmt = csi_fmt;
> >>> +
> >>> +	return 0;
> >>> +}
> >>> +
> >>> +static int sun6i_video_set_fmt(struct sun6i_video *video, struct v4l2_format *f)
> >>> +{
> >>> +	struct v4l2_subdev_format format;
> >>> +	struct sun6i_csi_format *current_fmt;
> >>> +	struct v4l2_subdev *subdev;
> >>> +	u32 pad;
> >>> +	int ret;
> >>> +
> >>> +	subdev = sun6i_video_remote_subdev(video, &pad);
> >>> +	if (subdev == NULL)
> >>> +		return -ENXIO;
> >>> +
> >>> +	ret = sun6i_video_try_fmt(video, f, &current_fmt);
> >>> +	if (ret)
> >>> +		return ret;
> >>> +
> >>> +	format.which = V4L2_SUBDEV_FORMAT_ACTIVE;
> >>> +	v4l2_fill_mbus_format(&format.format, &f->fmt.pix,
> >>> +			      current_fmt->mbus_code);
> >>> +	ret = v4l2_subdev_call(subdev, pad, set_fmt, NULL, &format);
> >>> +	if (ret < 0)
> >>> +		return ret;
> >>> +
> >>> +	video->fmt = *f;
> >>> +	video->current_fmt = current_fmt;
> >>> +
> >>> +	return 0;
> >>> +}
> >>> +
> >>> +static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
> >>> +				struct v4l2_format *f)
> >>> +{
> >>> +	struct sun6i_video *video = video_drvdata(file);
> >>> +
> >>> +	if (vb2_is_streaming(&video->vb2_vidq))
> >>
> >> This should be vb2_is_busy(). Once buffers are allocated you are no longer allowed
> >> to change the format, regardless of whether you are streaming or not.
> > 
> > OK.
> > 
> >>
> >>> +		return -EBUSY;
> >>> +
> >>> +	return sun6i_video_set_fmt(video, f);
> >>> +}
> >>> +
> >>> +static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
> >>> +				  struct v4l2_format *f)
> >>> +{
> >>> +	struct sun6i_video *video = video_drvdata(file);
> >>> +
> >>> +	return sun6i_video_try_fmt(video, f, NULL);
> >>> +}
> >>> +
> >>> +static const struct v4l2_ioctl_ops sun6i_video_ioctl_ops = {
> >>> +	.vidioc_querycap		= vidioc_querycap,
> >>> +	.vidioc_enum_fmt_vid_cap	= vidioc_enum_fmt_vid_cap,
> >>> +	.vidioc_g_fmt_vid_cap		= vidioc_g_fmt_vid_cap,
> >>> +	.vidioc_s_fmt_vid_cap		= vidioc_s_fmt_vid_cap,
> >>> +	.vidioc_try_fmt_vid_cap		= vidioc_try_fmt_vid_cap,
> >>> +
> >>> +	.vidioc_reqbufs			= vb2_ioctl_reqbufs,
> >>> +	.vidioc_querybuf		= vb2_ioctl_querybuf,
> >>> +	.vidioc_qbuf			= vb2_ioctl_qbuf,
> >>> +	.vidioc_expbuf			= vb2_ioctl_expbuf,
> >>> +	.vidioc_dqbuf			= vb2_ioctl_dqbuf,
> >>> +	.vidioc_create_bufs		= vb2_ioctl_create_bufs,
> >>> +	.vidioc_prepare_buf		= vb2_ioctl_prepare_buf,
> >>> +	.vidioc_streamon		= vb2_ioctl_streamon,
> >>> +	.vidioc_streamoff		= vb2_ioctl_streamoff,
> >>> +};
> >>> +
> >>> +/* -----------------------------------------------------------------------------
> >>> + * V4L2 file operations
> >>> + */
> >>> +static int sun6i_video_open(struct file *file)
> >>> +{
> >>> +	struct sun6i_video *video = video_drvdata(file);
> >>> +	struct v4l2_format format;
> >>> +	int ret;
> >>> +
> >>> +	if (mutex_lock_interruptible(&video->lock))
> >>> +		return -ERESTARTSYS;
> >>> +
> >>> +	ret = v4l2_fh_open(file);
> >>> +	if (ret < 0)
> >>> +		goto unlock;
> >>> +
> >>> +	ret = v4l2_pipeline_pm_use(&video->vdev.entity, 1);
> >>> +	if (ret < 0)
> >>> +		goto fh_release;
> >>> +
> >>> +	if (!v4l2_fh_is_singular_file(file))
> >>> +		goto unlock;
> >>> +
> >>> +	ret = sun6i_csi_set_power(video->csi, true);
> >>> +	if (ret < 0)
> >>> +		goto fh_release;
> >>> +
> >>> +	/* setup default format */
> >>> +	if (video->num_formats > 0) {
> >>> +		format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> >>> +		format.fmt.pix.width = 1280;
> >>> +		format.fmt.pix.height = 720;
> >>> +		format.fmt.pix.pixelformat = video->formats[0].fourcc;
> >>> +		sun6i_video_set_fmt(video, &format);
> >>> +	}
> >>
> >> No, this should happen when the driver is initialized. The format is
> >> persistent over open()/close() calls so should not be re-initialized
> >> here.
> > 
> > OK.
> > 
> >>
> >>> +
> >>> +	mutex_unlock(&video->lock);
> >>> +	return 0;
> >>> +
> >>> +fh_release:
> >>> +	v4l2_fh_release(file);
> >>> +unlock:
> >>> +	mutex_unlock(&video->lock);
> >>> +	return ret;
> >>> +}
> >>> +
> >>> +static int sun6i_video_close(struct file *file)
> >>> +{
> >>> +	struct sun6i_video *video = video_drvdata(file);
> >>> +	bool last_fh;
> >>> +
> >>> +	mutex_lock(&video->lock);
> >>> +
> >>> +	last_fh = v4l2_fh_is_singular_file(file);
> >>> +
> >>> +	_vb2_fop_release(file, NULL);
> >>> +
> >>> +	v4l2_pipeline_pm_use(&video->vdev.entity, 0);
> >>> +
> >>> +	if (last_fh)
> >>> +		sun6i_csi_set_power(video->csi, false);
> >>> +
> >>> +	mutex_unlock(&video->lock);
> >>> +
> >>> +	return 0;
> >>> +}
> >>> +
> >>> +static const struct v4l2_file_operations sun6i_video_fops = {
> >>> +	.owner		= THIS_MODULE,
> >>> +	.open		= sun6i_video_open,
> >>> +	.release	= sun6i_video_close,
> >>> +	.unlocked_ioctl	= video_ioctl2,
> >>> +	.mmap		= vb2_fop_mmap,
> >>> +	.poll		= vb2_fop_poll
> >>> +};
> >>> +
> >>> +/* -----------------------------------------------------------------------------
> >>> + * Media Operations
> >>> + */
> >>> +static int sun6i_video_formats_init(struct sun6i_video *video)
> >>> +{
> >>> +	struct v4l2_subdev_mbus_code_enum mbus_code = { 0 };
> >>> +	struct sun6i_csi *csi = video->csi;
> >>> +	struct v4l2_subdev *subdev;
> >>> +	u32 pad;
> >>> +	const u32 *pixformats;
> >>> +	int pixformat_count = 0;
> >>> +	u32 subdev_codes[32]; /* subdev format codes, 32 should be enough */
> >>> +	int codes_count = 0;
> >>> +	int num_fmts = 0;
> >>> +	int i, j;
> >>> +
> >>> +	subdev = sun6i_video_remote_subdev(video, &pad);
> >>> +	if (subdev == NULL)
> >>> +		return -ENXIO;
> >>> +
> >>> +	/* Get supported pixformats of CSI */
> >>> +	pixformat_count = sun6i_csi_get_supported_pixformats(csi, &pixformats);
> >>> +	if (pixformat_count <= 0)
> >>> +		return -ENXIO;
> >>> +
> >>> +	/* Get subdev formats codes */
> >>> +	mbus_code.pad = pad;
> >>> +	mbus_code.which = V4L2_SUBDEV_FORMAT_ACTIVE;
> >>> +	while (!v4l2_subdev_call(subdev, pad, enum_mbus_code, NULL,
> >>> +			&mbus_code)) {
> >>> +		subdev_codes[codes_count] = mbus_code.code;
> >>
> >> This definitely needs a check when codes_count >= ARRAY_SIZE(subdev_codes).
> > 
> > OK.
> > 
> >>
> >>> +		codes_count++;
> >>> +		mbus_code.index++;
> >>> +	}
> >>> +
> >>> +	if (!codes_count)
> >>> +		return -ENXIO;
> >>> +
> >>> +	/* Get supported formats count */
> >>> +	for (i = 0; i < codes_count; i++) {
> >>> +		for (j = 0; j < pixformat_count; j++) {
> >>> +			if (!sun6i_csi_is_format_support(csi, pixformats[j],
> >>> +					mbus_code.code)) {
> >>> +				continue;
> >>> +			}
> >>> +			num_fmts++;
> >>> +		}
> >>> +	}
> >>> +
> >>> +	if (!num_fmts)
> >>> +		return -ENXIO;
> >>> +
> >>> +	video->num_formats = num_fmts;
> >>> +	video->formats = devm_kcalloc(video->csi->dev, num_fmts,
> >>> +			sizeof(struct sun6i_csi_format), GFP_KERNEL);
> >>> +	if (!video->formats) {
> >>> +		dev_err(video->csi->dev, "could not allocate memory\n");
> >>> +		return -ENOMEM;
> >>> +	}
> >>> +
> >>> +	/* Get supported formats */
> >>> +	num_fmts = 0;
> >>> +	for (i = 0; i < codes_count; i++) {
> >>> +		for (j = 0; j < pixformat_count; j++) {
> >>> +			if (!sun6i_csi_is_format_support(csi, pixformats[j],
> >>> +					mbus_code.code)) {
> >>> +				continue;
> >>> +			}
> >>> +
> >>> +			video->formats[num_fmts].fourcc = pixformats[j];
> >>> +			video->formats[num_fmts].mbus_code =
> >>> +					mbus_code.code;
> >>> +			video->formats[num_fmts].bpp =
> >>> +					v4l2_pixformat_get_bpp(pixformats[j]);
> >>> +			num_fmts++;
> >>> +		}
> >>> +	}
> >>
> >> As mentioned above, the initial format should probably be configure here.
> > 
> > OK.
> > 
> >>
> >>> +
> >>> +	return 0;
> >>> +}
> >>> +
> >>> +static int sun6i_video_link_setup(struct media_entity *entity,
> >>> +				  const struct media_pad *local,
> >>> +				  const struct media_pad *remote, u32 flags)
> >>> +{
> >>> +	struct video_device *vdev = media_entity_to_video_device(entity);
> >>> +	struct sun6i_video *video = video_get_drvdata(vdev);
> >>> +
> >>> +	if (WARN_ON(video == NULL))
> >>> +		return 0;
> >>> +
> >>> +	return sun6i_video_formats_init(video);
> >>
> >> Why is this called here? Why not in video_init()?
> > 
> > sun6i_video_init is in the driver probe context. sun6i_video_formats_init
> > use media_entity_remote_pad and media_entity_to_v4l2_subdev to find the
> > subdevs.
> > The media_entity_remote_pad can't work before all the media pad linked.
> 
> A video_init is typically called from the notify_complete callback.
> Actually, that's where the video_register_device should be created as well.
> When you create it in probe() there is possibly no sensor yet, so it would
> be a dead video node (or worse, crash when used).
> 
> There are still a lot of platform drivers that create the video node in the
> probe, but it's not the right place if you rely on the async loading of
> subdevs.

A video_init with media_entity_pads_init must be called before media pad
linking wether is called from probe() or the notify_complete callback.
But, sun6i_video_formats_init must be called after that.

video_register_device is another question. I can seperate it from 
video_init into a new function sun6i_video_register. And call it in
notify_complete callback.

> 
> Regards,
> 
> 	Hans
> 
> Regards,
> 
> 	Hans


Thanks,
Yong

Maxime Ripard Aug. 22, 2017, 5:43 p.m. UTC | #14

Hi Yong,

On Mon, Jul 31, 2017 at 11:16:40AM +0800, Yong wrote:
> > > @@ -143,6 +143,7 @@ source "drivers/media/platform/am437x/Kconfig"
> > >  source "drivers/media/platform/xilinx/Kconfig"
> > >  source "drivers/media/platform/rcar-vin/Kconfig"
> > >  source "drivers/media/platform/atmel/Kconfig"
> > > +source "drivers/media/platform/sun6i-csi/Kconfig"
> > 
> > We're going to have several different drivers in v4l eventually, so I
> > guess it would make sense to move to a directory of our own.
> 
> Like this?
> drivers/media/platform/sunxi/sun6i-csi

Yep.

> > > +static int sun6i_graph_notify_complete(struct v4l2_async_notifier *notifier)
> > > +{
> > > +	struct sun6i_csi *csi =
> > > +			container_of(notifier, struct sun6i_csi, notifier);
> > > +	struct sun6i_graph_entity *entity;
> > > +	int ret;
> > > +
> > > +	dev_dbg(csi->dev, "notify complete, all subdevs registered\n");
> > > +
> > > +	/* Create links for every entity. */
> > > +	list_for_each_entry(entity, &csi->entities, list) {
> > > +		ret = sun6i_graph_build_one(csi, entity);
> > > +		if (ret < 0)
> > > +			return ret;
> > > +	}
> > > +
> > > +	/* Create links for video node. */
> > > +	ret = sun6i_graph_build_video(csi);
> > > +	if (ret < 0)
> > > +		return ret;
> > 
> > Can you elaborate a bit on the difference between a node parsed with
> > _graph_build_one and _graph_build_video? Can't you just store the
> > remote sensor when you build the notifier, and reuse it here?
> 
> There maybe many usercases:
> 1. CSI->Sensor.
> 2. CSI->MIPI->Sensor.
> 3. CSI->FPGA->Sensor1
>             ->Sensor2.
> FPGA maybe some other video processor. FPGA, MIPI, Sensor can be
> registered as v4l2 subdevs. We do not care about the driver code
> of them. But they should be linked together here.
> 
> So, the _graph_build_one is used to link CSI port and subdevs. 
> _graph_build_video is used to link CSI port and video node.

So the graph_build_one is for the two first cases, and the
_build_video for the latter case?

If so, you should take a look at the last iteration of the
subnotifiers rework by Nikas Söderlund (v4l2-async: add subnotifier
registration for subdevices).

It allows subdevs to register notifiers, and you don't have to build
the graph from the video device, each device and subdev can only care
about what's next in the pipeline, but not really what's behind it.

That would mean in your case that you can only deal with your single
CSI pad, and whatever subdev driver will use it care about its own.

> This part is also difficult to understand for me. The one CSI module
> have only one DMA channel(single port). But thay can be linked to 
> different physical port (Parallel or MIPI)(multiple ep) by IF select
> register.
> 
> For now, the binding can have several ep, the driver will just pick
> the first valid one.

Yeah, I'm not really sure how we could deal with that, but I guess we
can do it later on.

> > 
> > > +struct sun6i_csi_ops {
> > > +	int (*get_supported_pixformats)(struct sun6i_csi *csi,
> > > +					const u32 **pixformats);
> > > +	bool (*is_format_support)(struct sun6i_csi *csi, u32 pixformat,
> > > +				  u32 mbus_code);
> > > +	int (*s_power)(struct sun6i_csi *csi, bool enable);
> > > +	int (*update_config)(struct sun6i_csi *csi,
> > > +			     struct sun6i_csi_config *config);
> > > +	int (*update_buf_addr)(struct sun6i_csi *csi, dma_addr_t addr);
> > > +	int (*s_stream)(struct sun6i_csi *csi, bool enable);
> > > +};
> > 
> > Didn't we agreed on removing those in the first iteration? It's not
> > really clear at this point whether they will be needed at all. Make
> > something simple first, without those ops. When we'll support other
> > SoCs we'll have a better chance at seeing what and how we should deal
> > with potential quirks.
> 
> OK. But without ops, it is inappropriate to sun6i_csi and sun6i_csi.
> Maybe I should merge the two files.

I'm not sure what you meant here, but if you think that's appropriate,
please go ahead.

> > > +		return IRQ_HANDLED;
> > > +	}
> > > +
> > > +	if (status & CSI_CH_INT_STA_FD_PD) {
> > > +		sun6i_video_frame_done(&sdev->csi.video);
> > > +	}
> > > +
> > > +	regmap_write(regmap, CSI_CH_INT_STA_REG, status);
> > 
> > Isn't it redundant with the one you did in the condition a bit above?
> > 
> > You should also check that your device indeed generated an
> > interrupt. In the occurence of a spourious interrupt, your code will
> > return IRQ_HANDLED, which is the wrong thing to do.
> > 
> > I think you should reverse your logic a bit here to make this
> > easier. You should just check that your status flags are indeed set,
> > and if not just bail out and return IRQ_NONE.
> > 
> > And if they are, go on with treating your interrupt.
> 
> OK. I will add check for status flags.
> BTW, how can a spurious interrupt occurred?

Usually it's either through some interference, or some poorly designed
controller. This is unlikely, but it's something you should take into
account.

Thanks!
Maxime

Maxime Ripard Aug. 22, 2017, 8:17 p.m. UTC | #15

On Tue, Aug 22, 2017 at 08:43:35AM +0200, Hans Verkuil wrote:
> >>> +static int sun6i_video_link_setup(struct media_entity *entity,
> >>> +				  const struct media_pad *local,
> >>> +				  const struct media_pad *remote, u32 flags)
> >>> +{
> >>> +	struct video_device *vdev = media_entity_to_video_device(entity);
> >>> +	struct sun6i_video *video = video_get_drvdata(vdev);
> >>> +
> >>> +	if (WARN_ON(video == NULL))
> >>> +		return 0;
> >>> +
> >>> +	return sun6i_video_formats_init(video);
> >>
> >> Why is this called here? Why not in video_init()?
> > 
> > sun6i_video_init is in the driver probe context. sun6i_video_formats_init
> > use media_entity_remote_pad and media_entity_to_v4l2_subdev to find the
> > subdevs.
> > The media_entity_remote_pad can't work before all the media pad linked.
> 
> A video_init is typically called from the notify_complete callback.
> Actually, that's where the video_register_device should be created as well.
> When you create it in probe() there is possibly no sensor yet, so it would
> be a dead video node (or worse, crash when used).
> 
> There are still a lot of platform drivers that create the video node in the
> probe, but it's not the right place if you rely on the async loading of
> subdevs.

That's not really related, but I'm not really sure it's a good way to
operate. This essentially means that you might wait forever for a
component in your pipeline to be probed, without any chance of it
happening (not compiled, compiled as a module and not loaded, hardware
defect preventing the driver from probing properly, etc), even though
that component might not be essential.

This is how DRM operates, and you sometimes end up in some very dumb
situations where you wait for say, the DSI controller to probe, while
you only care about HDMI in your system.

But this seems to be on of the hot topic these days, so we might
discuss it further in some other thread :)

Maxime

Laurent Pinchart Aug. 22, 2017, 8:52 p.m. UTC | #16

Hello,

On Tuesday, 22 August 2017 23:17:31 EEST Maxime Ripard wrote:
> On Tue, Aug 22, 2017 at 08:43:35AM +0200, Hans Verkuil wrote:
> >>>> +static int sun6i_video_link_setup(struct media_entity *entity,
> >>>> +				  const struct media_pad *local,
> >>>> +				  const struct media_pad *remote, u32 flags)
> >>>> +{
> >>>> +	struct video_device *vdev = media_entity_to_video_device(entity);
> >>>> +	struct sun6i_video *video = video_get_drvdata(vdev);
> >>>> +
> >>>> +	if (WARN_ON(video == NULL))
> >>>> +		return 0;
> >>>> +
> >>>> +	return sun6i_video_formats_init(video);
> >>> 
> >>> Why is this called here? Why not in video_init()?
> >> 
> >> sun6i_video_init is in the driver probe context.
> >> sun6i_video_formats_init use media_entity_remote_pad and
> >> media_entity_to_v4l2_subdev to find the subdevs.
> >> The media_entity_remote_pad can't work before all the media pad linked.
> > 
> > A video_init is typically called from the notify_complete callback.
> > Actually, that's where the video_register_device should be created as
> > well. When you create it in probe() there is possibly no sensor yet, so it
> > would be a dead video node (or worse, crash when used).
> > 
> > There are still a lot of platform drivers that create the video node in
> > the probe, but it's not the right place if you rely on the async loading
> > of subdevs.
> 
> That's not really related, but I'm not really sure it's a good way to
> operate. This essentially means that you might wait forever for a
> component in your pipeline to be probed, without any chance of it
> happening (not compiled, compiled as a module and not loaded, hardware
> defect preventing the driver from probing properly, etc), even though
> that component might not be essential.

I agree with Maxime here, we should build the media device incrementally, and 
offer userspace access early on without waiting for all pieces to be 
available. If properly implemented (there should definitely be so crash) I 
don't see any drawback to that approach.

> This is how DRM operates, and you sometimes end up in some very dumb
> situations where you wait for say, the DSI controller to probe, while
> you only care about HDMI in your system.
> 
> But this seems to be on of the hot topic these days, so we might
> discuss it further in some other thread :)

Or here :-)

yong Aug. 23, 2017, 2:32 a.m. UTC | #17

On Tue, 22 Aug 2017 19:43:39 +0200
Maxime Ripard <[e-mail]> wrote:

> Hi Yong,
> 
> On Mon, Jul 31, 2017 at 11:16:40AM +0800, Yong wrote:
> > > > @@ -143,6 +143,7 @@ source "drivers/media/platform/am437x/Kconfig"
> > > >  source "drivers/media/platform/xilinx/Kconfig"
> > > >  source "drivers/media/platform/rcar-vin/Kconfig"
> > > >  source "drivers/media/platform/atmel/Kconfig"
> > > > +source "drivers/media/platform/sun6i-csi/Kconfig"
> > > 
> > > We're going to have several different drivers in v4l eventually, so I
> > > guess it would make sense to move to a directory of our own.
> > 
> > Like this?
> > drivers/media/platform/sunxi/sun6i-csi
> 
> Yep.
> 
> > > > +static int sun6i_graph_notify_complete(struct v4l2_async_notifier *notifier)
> > > > +{
> > > > +	struct sun6i_csi *csi =
> > > > +			container_of(notifier, struct sun6i_csi, notifier);
> > > > +	struct sun6i_graph_entity *entity;
> > > > +	int ret;
> > > > +
> > > > +	dev_dbg(csi->dev, "notify complete, all subdevs registered\n");
> > > > +
> > > > +	/* Create links for every entity. */
> > > > +	list_for_each_entry(entity, &csi->entities, list) {
> > > > +		ret = sun6i_graph_build_one(csi, entity);
> > > > +		if (ret < 0)
> > > > +			return ret;
> > > > +	}
> > > > +
> > > > +	/* Create links for video node. */
> > > > +	ret = sun6i_graph_build_video(csi);
> > > > +	if (ret < 0)
> > > > +		return ret;
> > > 
> > > Can you elaborate a bit on the difference between a node parsed with
> > > _graph_build_one and _graph_build_video? Can't you just store the
> > > remote sensor when you build the notifier, and reuse it here?
> > 
> > There maybe many usercases:
> > 1. CSI->Sensor.
> > 2. CSI->MIPI->Sensor.
> > 3. CSI->FPGA->Sensor1
> >             ->Sensor2.
> > FPGA maybe some other video processor. FPGA, MIPI, Sensor can be
> > registered as v4l2 subdevs. We do not care about the driver code
> > of them. But they should be linked together here.
> > 
> > So, the _graph_build_one is used to link CSI port and subdevs. 
> > _graph_build_video is used to link CSI port and video node.
> 
> So the graph_build_one is for the two first cases, and the
> _build_video for the latter case?

No. 
The _graph_build_one is used to link the subdevs found in the device 
tree. _build_video is used to link the closest subdev to video node.
Video node is created in the driver, so the method to get it's pad is
diffrent to the subdevs.

> 
> If so, you should take a look at the last iteration of the
> subnotifiers rework by Nikas Söderlund (v4l2-async: add subnotifier
> registration for subdevices).
> 
> It allows subdevs to register notifiers, and you don't have to build
> the graph from the video device, each device and subdev can only care
> about what's next in the pipeline, but not really what's behind it.
> 
> That would mean in your case that you can only deal with your single
> CSI pad, and whatever subdev driver will use it care about its own.

Do you mean the subdevs create pad link in the notifier registered by
themself ?
If so, _graph_build_one is needless. But how to make sure the pipeline
has linked correctly when operateing the pipeline. 
I will lookt at this in more detail.

> 
> > This part is also difficult to understand for me. The one CSI module
> > have only one DMA channel(single port). But thay can be linked to 
> > different physical port (Parallel or MIPI)(multiple ep) by IF select
> > register.
> > 
> > For now, the binding can have several ep, the driver will just pick
> > the first valid one.
> 
> Yeah, I'm not really sure how we could deal with that, but I guess we
> can do it later on.
> 
> > > 
> > > > +struct sun6i_csi_ops {
> > > > +	int (*get_supported_pixformats)(struct sun6i_csi *csi,
> > > > +					const u32 **pixformats);
> > > > +	bool (*is_format_support)(struct sun6i_csi *csi, u32 pixformat,
> > > > +				  u32 mbus_code);
> > > > +	int (*s_power)(struct sun6i_csi *csi, bool enable);
> > > > +	int (*update_config)(struct sun6i_csi *csi,
> > > > +			     struct sun6i_csi_config *config);
> > > > +	int (*update_buf_addr)(struct sun6i_csi *csi, dma_addr_t addr);
> > > > +	int (*s_stream)(struct sun6i_csi *csi, bool enable);
> > > > +};
> > > 
> > > Didn't we agreed on removing those in the first iteration? It's not
> > > really clear at this point whether they will be needed at all. Make
> > > something simple first, without those ops. When we'll support other
> > > SoCs we'll have a better chance at seeing what and how we should deal
> > > with potential quirks.
> > 
> > OK. But without ops, it is inappropriate to sun6i_csi and sun6i_csi.
> > Maybe I should merge the two files.
> 
> I'm not sure what you meant here, but if you think that's appropriate,
> please go ahead.
> 
> > > > +		return IRQ_HANDLED;
> > > > +	}
> > > > +
> > > > +	if (status & CSI_CH_INT_STA_FD_PD) {
> > > > +		sun6i_video_frame_done(&sdev->csi.video);
> > > > +	}
> > > > +
> > > > +	regmap_write(regmap, CSI_CH_INT_STA_REG, status);
> > > 
> > > Isn't it redundant with the one you did in the condition a bit above?
> > > 
> > > You should also check that your device indeed generated an
> > > interrupt. In the occurence of a spourious interrupt, your code will
> > > return IRQ_HANDLED, which is the wrong thing to do.
> > > 
> > > I think you should reverse your logic a bit here to make this
> > > easier. You should just check that your status flags are indeed set,
> > > and if not just bail out and return IRQ_NONE.
> > > 
> > > And if they are, go on with treating your interrupt.
> > 
> > OK. I will add check for status flags.
> > BTW, how can a spurious interrupt occurred?
> 
> Usually it's either through some interference, or some poorly designed
> controller. This is unlikely, but it's something you should take into
> account.
> 
> Thanks!
> Maxime
> 
> -- 
> Maxime Ripard, Free Electrons
> Embedded Linux and Kernel engineering
> http://free-electrons.com


Thanks,
Yong

yong Aug. 23, 2017, 2:41 a.m. UTC | #18

On Mon, 21 Aug 2017 22:21:45 +0200
Maxime Ripard <[e-mail]> wrote:

> Hi Baruch,
> 
> On Sun, Jul 30, 2017 at 09:08:01AM +0300, Baruch Siach wrote:
> > On Fri, Jul 28, 2017 at 06:02:33PM +0200, Maxime Ripard wrote:
> > > Hi, 
> > > 
> > > Thanks for the second iteration!
> > > 
> > > On Thu, Jul 27, 2017 at 01:01:35PM +0800, Yong Deng wrote:
> > > > Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> > > > and CSI1 is used for parallel interface. This is not documented in
> > > > datasheet but by testing and guess.
> > > > 
> > > > This patch implement a v4l2 framework driver for it.
> > > > 
> > > > Currently, the driver only support the parallel interface. MIPI-CSI2,
> > > > ISP's support are not included in this patch.
> > > > 
> > > > Signed-off-by: Yong Deng <[e-mail]>
> > 
> > [...]
> > 
> > > > +#ifdef DEBUG
> > > > +static void sun6i_csi_dump_regs(struct sun6i_csi_dev *sdev)
> > > > +{
> > > > +	struct regmap *regmap = sdev->regmap;
> > > > +	u32 val;
> > > > +
> > > > +	regmap_read(regmap, CSI_EN_REG, &val);
> > > > +	printk("CSI_EN_REG=0x%x\n",		val);
> > > > +	regmap_read(regmap, CSI_IF_CFG_REG, &val);
> > > > +	printk("CSI_IF_CFG_REG=0x%x\n",		val);
> > > > +	regmap_read(regmap, CSI_CAP_REG, &val);
> > > > +	printk("CSI_CAP_REG=0x%x\n",		val);
> > > > +	regmap_read(regmap, CSI_SYNC_CNT_REG, &val);
> > > > +	printk("CSI_SYNC_CNT_REG=0x%x\n",	val);
> > > > +	regmap_read(regmap, CSI_FIFO_THRS_REG, &val);
> > > > +	printk("CSI_FIFO_THRS_REG=0x%x\n",	val);
> > > > +	regmap_read(regmap, CSI_PTN_LEN_REG, &val);
> > > > +	printk("CSI_PTN_LEN_REG=0x%x\n",	val);
> > > > +	regmap_read(regmap, CSI_PTN_ADDR_REG, &val);
> > > > +	printk("CSI_PTN_ADDR_REG=0x%x\n",	val);
> > > > +	regmap_read(regmap, CSI_VER_REG, &val);
> > > > +	printk("CSI_VER_REG=0x%x\n",		val);
> > > > +	regmap_read(regmap, CSI_CH_CFG_REG, &val);
> > > > +	printk("CSI_CH_CFG_REG=0x%x\n",		val);
> > > > +	regmap_read(regmap, CSI_CH_SCALE_REG, &val);
> > > > +	printk("CSI_CH_SCALE_REG=0x%x\n",	val);
> > > > +	regmap_read(regmap, CSI_CH_F0_BUFA_REG, &val);
> > > > +	printk("CSI_CH_F0_BUFA_REG=0x%x\n",	val);
> > > > +	regmap_read(regmap, CSI_CH_F1_BUFA_REG, &val);
> > > > +	printk("CSI_CH_F1_BUFA_REG=0x%x\n",	val);
> > > > +	regmap_read(regmap, CSI_CH_F2_BUFA_REG, &val);
> > > > +	printk("CSI_CH_F2_BUFA_REG=0x%x\n",	val);
> > > > +	regmap_read(regmap, CSI_CH_STA_REG, &val);
> > > > +	printk("CSI_CH_STA_REG=0x%x\n",		val);
> > > > +	regmap_read(regmap, CSI_CH_INT_EN_REG, &val);
> > > > +	printk("CSI_CH_INT_EN_REG=0x%x\n",	val);
> > > > +	regmap_read(regmap, CSI_CH_INT_STA_REG, &val);
> > > > +	printk("CSI_CH_INT_STA_REG=0x%x\n",	val);
> > > > +	regmap_read(regmap, CSI_CH_FLD1_VSIZE_REG, &val);
> > > > +	printk("CSI_CH_FLD1_VSIZE_REG=0x%x\n",	val);
> > > > +	regmap_read(regmap, CSI_CH_HSIZE_REG, &val);
> > > > +	printk("CSI_CH_HSIZE_REG=0x%x\n",	val);
> > > > +	regmap_read(regmap, CSI_CH_VSIZE_REG, &val);
> > > > +	printk("CSI_CH_VSIZE_REG=0x%x\n",	val);
> > > > +	regmap_read(regmap, CSI_CH_BUF_LEN_REG, &val);
> > > > +	printk("CSI_CH_BUF_LEN_REG=0x%x\n",	val);
> > > > +	regmap_read(regmap, CSI_CH_FLIP_SIZE_REG, &val);
> > > > +	printk("CSI_CH_FLIP_SIZE_REG=0x%x\n",	val);
> > > > +	regmap_read(regmap, CSI_CH_FRM_CLK_CNT_REG, &val);
> > > > +	printk("CSI_CH_FRM_CLK_CNT_REG=0x%x\n",	val);
> > > > +	regmap_read(regmap, CSI_CH_ACC_ITNL_CLK_CNT_REG, &val);
> > > > +	printk("CSI_CH_ACC_ITNL_CLK_CNT_REG=0x%x\n",	val);
> > > > +	regmap_read(regmap, CSI_CH_FIFO_STAT_REG, &val);
> > > > +	printk("CSI_CH_FIFO_STAT_REG=0x%x\n",	val);
> > > > +	regmap_read(regmap, CSI_CH_PCLK_STAT_REG, &val);
> > > > +	printk("CSI_CH_PCLK_STAT_REG=0x%x\n",	val);
> > > > +}
> > > > +#endif
> > > 
> > > You can already dump a regmap through debugfs, that's redundant.
> > 
> > The advantage of in-code registers dump routine is the ability to
> > synchronize the snapshot with the driver code execution. This is
> > particularly important for the capture statistics registers. I have
> > found it useful here.
> 
> You also have the option to use the traces to do that, but if that's
> useful, this should be added to regmap itself. It can benefit others
> too.
> 
> > > > +static irqreturn_t sun6i_csi_isr(int irq, void *dev_id)
> > > > +{
> > > > +	struct sun6i_csi_dev *sdev = (struct sun6i_csi_dev *)dev_id;
> > > > +	struct regmap *regmap = sdev->regmap;
> > > > +	u32 status;
> > > > +
> > > > +	regmap_read(regmap, CSI_CH_INT_STA_REG, &status);
> > > > +
> > > > +	if ((status & CSI_CH_INT_STA_FIFO0_OF_PD) ||
> > > > +	    (status & CSI_CH_INT_STA_FIFO1_OF_PD) ||
> > > > +	    (status & CSI_CH_INT_STA_FIFO2_OF_PD) ||
> > > > +	    (status & CSI_CH_INT_STA_HB_OF_PD)) {
> > > > +		regmap_write(regmap, CSI_CH_INT_STA_REG, status);
> > > > +		regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, 0);
> > > > +		regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN,
> > > > +				   CSI_EN_CSI_EN);
> > > 
> > > You need to enable / disable it at every frame? How do you deal with
> > > double buffering? (or did you choose to ignore it for now?)
> > 
> > These *_OF_PD status bits indicate an overflow error condition.
> 
> Shouldn't we return an error code then? The names of these flags could
> be better too.

Then, where and how to deal with the error coce.

> 
> Maxime
> 
> -- 
> Maxime Ripard, Free Electrons
> Embedded Linux and Kernel engineering
> http://free-electrons.com


Thanks,
Yong

Hans Verkuil Aug. 23, 2017, 6:52 a.m. UTC | #19

On 08/22/2017 10:17 PM, Maxime Ripard wrote:
> On Tue, Aug 22, 2017 at 08:43:35AM +0200, Hans Verkuil wrote:
>>>>> +static int sun6i_video_link_setup(struct media_entity *entity,
>>>>> +				  const struct media_pad *local,
>>>>> +				  const struct media_pad *remote, u32 flags)
>>>>> +{
>>>>> +	struct video_device *vdev = media_entity_to_video_device(entity);
>>>>> +	struct sun6i_video *video = video_get_drvdata(vdev);
>>>>> +
>>>>> +	if (WARN_ON(video == NULL))
>>>>> +		return 0;
>>>>> +
>>>>> +	return sun6i_video_formats_init(video);
>>>>
>>>> Why is this called here? Why not in video_init()?
>>>
>>> sun6i_video_init is in the driver probe context. sun6i_video_formats_init
>>> use media_entity_remote_pad and media_entity_to_v4l2_subdev to find the
>>> subdevs.
>>> The media_entity_remote_pad can't work before all the media pad linked.
>>
>> A video_init is typically called from the notify_complete callback.
>> Actually, that's where the video_register_device should be created as well.
>> When you create it in probe() there is possibly no sensor yet, so it would
>> be a dead video node (or worse, crash when used).
>>
>> There are still a lot of platform drivers that create the video node in the
>> probe, but it's not the right place if you rely on the async loading of
>> subdevs.
> 
> That's not really related, but I'm not really sure it's a good way to
> operate. This essentially means that you might wait forever for a
> component in your pipeline to be probed, without any chance of it
> happening (not compiled, compiled as a module and not loaded, hardware
> defect preventing the driver from probing properly, etc), even though
> that component might not be essential.

We're talking straightforward video pipelines here. I.e. a source, some
processing units and a DMA engine at the end. There is no point in
creating a video node if the pipeline is not complete since you need
the full pipeline.

I've had bad experiences in the past where video nodes were created too
soon and part of the internal state was still incomplete, causing at best
weird behavior and at worst crashes.

More complex devices are a whole different ballgame.

Regards,

	Hans

> This is how DRM operates, and you sometimes end up in some very dumb
> situations where you wait for say, the DSI controller to probe, while
> you only care about HDMI in your system.
> 
> But this seems to be on of the hot topic these days, so we might
> discuss it further in some other thread :)
> 
> Maxime
>

Laurent Pinchart Aug. 23, 2017, 7:43 a.m. UTC | #20

Hi Hans,

On Wednesday, 23 August 2017 09:52:00 EEST Hans Verkuil wrote:
> On 08/22/2017 10:17 PM, Maxime Ripard wrote:
> > On Tue, Aug 22, 2017 at 08:43:35AM +0200, Hans Verkuil wrote:
> >>>>> +static int sun6i_video_link_setup(struct media_entity *entity,
> >>>>> +				  const struct media_pad *local,
> >>>>> +				  const struct media_pad *remote, u32 flags)
> >>>>> +{
> >>>>> +	struct video_device *vdev = media_entity_to_video_device(entity);
> >>>>> +	struct sun6i_video *video = video_get_drvdata(vdev);
> >>>>> +
> >>>>> +	if (WARN_ON(video == NULL))
> >>>>> +		return 0;
> >>>>> +
> >>>>> +	return sun6i_video_formats_init(video);
> >>>> 
> >>>> Why is this called here? Why not in video_init()?
> >>> 
> >>> sun6i_video_init is in the driver probe context. 
> >>> sun6i_video_formats_init use media_entity_remote_pad and
> >>> media_entity_to_v4l2_subdev to find the subdevs.
> >>> The media_entity_remote_pad can't work before all the media pad linked.
> >> 
> >> A video_init is typically called from the notify_complete callback.
> >> Actually, that's where the video_register_device should be created as
> >> well. When you create it in probe() there is possibly no sensor yet, so
> >> it would be a dead video node (or worse, crash when used).
> >> 
> >> There are still a lot of platform drivers that create the video node in
> >> the probe, but it's not the right place if you rely on the async loading
> >> of subdevs.
> > 
> > That's not really related, but I'm not really sure it's a good way to
> > operate. This essentially means that you might wait forever for a
> > component in your pipeline to be probed, without any chance of it
> > happening (not compiled, compiled as a module and not loaded, hardware
> > defect preventing the driver from probing properly, etc), even though
> > that component might not be essential.
> 
> We're talking straightforward video pipelines here. I.e. a source, some
> processing units and a DMA engine at the end.

As a first step possibly, but many SoCs have ISPs that are not supported by 
the initial camera driver version.

> There is no point in creating a video node if the pipeline is not complete
> since you need the full pipeline.
> 
> I've had bad experiences in the past where video nodes were created too
> soon and part of the internal state was still incomplete, causing at best
> weird behavior and at worst crashes.

Drivers obviously need to be fixed if they are buggy in that regard. Such race 
conditions are definitely something I keep an eye on when reviewing code.

> More complex devices are a whole different ballgame.
> 
> > This is how DRM operates, and you sometimes end up in some very dumb
> > situations where you wait for say, the DSI controller to probe, while
> > you only care about HDMI in your system.
> > 
> > But this seems to be on of the hot topic these days, so we might
> > discuss it further in some other thread :)

Icenowy Zheng Aug. 23, 2017, 11:13 a.m. UTC | #21

在 2017-08-23 15:43，Laurent Pinchart 写道：
> Hi Hans,
> 
> On Wednesday, 23 August 2017 09:52:00 EEST Hans Verkuil wrote:
>> On 08/22/2017 10:17 PM, Maxime Ripard wrote:
>> > On Tue, Aug 22, 2017 at 08:43:35AM +0200, Hans Verkuil wrote:
>> >>>>> +static int sun6i_video_link_setup(struct media_entity *entity,
>> >>>>> +				  const struct media_pad *local,
>> >>>>> +				  const struct media_pad *remote, u32 flags)
>> >>>>> +{
>> >>>>> +	struct video_device *vdev = media_entity_to_video_device(entity);
>> >>>>> +	struct sun6i_video *video = video_get_drvdata(vdev);
>> >>>>> +
>> >>>>> +	if (WARN_ON(video == NULL))
>> >>>>> +		return 0;
>> >>>>> +
>> >>>>> +	return sun6i_video_formats_init(video);
>> >>>>
>> >>>> Why is this called here? Why not in video_init()?
>> >>>
>> >>> sun6i_video_init is in the driver probe context.
>> >>> sun6i_video_formats_init use media_entity_remote_pad and
>> >>> media_entity_to_v4l2_subdev to find the subdevs.
>> >>> The media_entity_remote_pad can't work before all the media pad linked.
>> >>
>> >> A video_init is typically called from the notify_complete callback.
>> >> Actually, that's where the video_register_device should be created as
>> >> well. When you create it in probe() there is possibly no sensor yet, so
>> >> it would be a dead video node (or worse, crash when used).
>> >>
>> >> There are still a lot of platform drivers that create the video node in
>> >> the probe, but it's not the right place if you rely on the async loading
>> >> of subdevs.
>> >
>> > That's not really related, but I'm not really sure it's a good way to
>> > operate. This essentially means that you might wait forever for a
>> > component in your pipeline to be probed, without any chance of it
>> > happening (not compiled, compiled as a module and not loaded, hardware
>> > defect preventing the driver from probing properly, etc), even though
>> > that component might not be essential.
>> 
>> We're talking straightforward video pipelines here. I.e. a source, 
>> some
>> processing units and a DMA engine at the end.
> 
> As a first step possibly, but many SoCs have ISPs that are not 
> supported by
> the initial camera driver version.

I think here it's also the situation.

Allwinner SoCs beyond sun6i (which is this driver targeting at) has an 
ISP
internally called "HawkView ISP", and there's no document of it (even 
the
source code is only released in recent several months).

> 
>> There is no point in creating a video node if the pipeline is not 
>> complete
>> since you need the full pipeline.
>> 
>> I've had bad experiences in the past where video nodes were created 
>> too
>> soon and part of the internal state was still incomplete, causing at 
>> best
>> weird behavior and at worst crashes.
> 
> Drivers obviously need to be fixed if they are buggy in that regard. 
> Such race
> conditions are definitely something I keep an eye on when reviewing 
> code.
> 
>> More complex devices are a whole different ballgame.
>> 
>> > This is how DRM operates, and you sometimes end up in some very dumb
>> > situations where you wait for say, the DSI controller to probe, while
>> > you only care about HDMI in your system.
>> >
>> > But this seems to be on of the hot topic these days, so we might
>> > discuss it further in some other thread :)

Maxime Ripard Aug. 23, 2017, 7:24 p.m. UTC | #22

On Wed, Aug 23, 2017 at 10:41:18AM +0800, Yong wrote:
> > > > > +static irqreturn_t sun6i_csi_isr(int irq, void *dev_id)
> > > > > +{
> > > > > +	struct sun6i_csi_dev *sdev = (struct sun6i_csi_dev *)dev_id;
> > > > > +	struct regmap *regmap = sdev->regmap;
> > > > > +	u32 status;
> > > > > +
> > > > > +	regmap_read(regmap, CSI_CH_INT_STA_REG, &status);
> > > > > +
> > > > > +	if ((status & CSI_CH_INT_STA_FIFO0_OF_PD) ||
> > > > > +	    (status & CSI_CH_INT_STA_FIFO1_OF_PD) ||
> > > > > +	    (status & CSI_CH_INT_STA_FIFO2_OF_PD) ||
> > > > > +	    (status & CSI_CH_INT_STA_HB_OF_PD)) {
> > > > > +		regmap_write(regmap, CSI_CH_INT_STA_REG, status);
> > > > > +		regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, 0);
> > > > > +		regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN,
> > > > > +				   CSI_EN_CSI_EN);
> > > > 
> > > > You need to enable / disable it at every frame? How do you deal with
> > > > double buffering? (or did you choose to ignore it for now?)
> > > 
> > > These *_OF_PD status bits indicate an overflow error condition.
> > 
> > Shouldn't we return an error code then? The names of these flags could
> > be better too.
> 
> Then, where and how to deal with the error coce.

If you want to deal with FIFO overflow, I'm not sure you have anything
to do. It means, you've been to slow to queue buffers, so I guess
stopping the pipeline until more buffers are queued would make
sense. And we should probably increase the sequence number while doing
so to notify the userspace that some frames were lost.

Maxime

yong Aug. 24, 2017, 1:43 a.m. UTC | #23

On Wed, 23 Aug 2017 21:24:13 +0200
Maxime Ripard <[e-mail]> wrote:

> On Wed, Aug 23, 2017 at 10:41:18AM +0800, Yong wrote:
> > > > > > +static irqreturn_t sun6i_csi_isr(int irq, void *dev_id)
> > > > > > +{
> > > > > > +	struct sun6i_csi_dev *sdev = (struct sun6i_csi_dev *)dev_id;
> > > > > > +	struct regmap *regmap = sdev->regmap;
> > > > > > +	u32 status;
> > > > > > +
> > > > > > +	regmap_read(regmap, CSI_CH_INT_STA_REG, &status);
> > > > > > +
> > > > > > +	if ((status & CSI_CH_INT_STA_FIFO0_OF_PD) ||
> > > > > > +	    (status & CSI_CH_INT_STA_FIFO1_OF_PD) ||
> > > > > > +	    (status & CSI_CH_INT_STA_FIFO2_OF_PD) ||
> > > > > > +	    (status & CSI_CH_INT_STA_HB_OF_PD)) {
> > > > > > +		regmap_write(regmap, CSI_CH_INT_STA_REG, status);
> > > > > > +		regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, 0);
> > > > > > +		regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN,
> > > > > > +				   CSI_EN_CSI_EN);
> > > > > 
> > > > > You need to enable / disable it at every frame? How do you deal with
> > > > > double buffering? (or did you choose to ignore it for now?)
> > > > 
> > > > These *_OF_PD status bits indicate an overflow error condition.
> > > 
> > > Shouldn't we return an error code then? The names of these flags could
> > > be better too.
> > 
> > Then, where and how to deal with the error coce.
> 
> If you want to deal with FIFO overflow, I'm not sure you have anything
> to do. It means, you've been to slow to queue buffers, so I guess
> stopping the pipeline until more buffers are queued would make
> sense. And we should probably increase the sequence number while doing
> so to notify the userspace that some frames were lost.

If there is no queued buffers, the CSI must has been already stoped by
sun6i_video_frame_done. So, the FIFO overflow may only occur on some 
unpredictable conditions or something I don't know.

For sequence number, I can't actually get the number of the lost frames.

Maybe I misunderstood you. Did you mean use IRQ_RETVAL(error) instead
of IRQ_HANDLED?

> 
> Maxime
> 
> -- 
> Maxime Ripard, Free Electrons
> Embedded Linux and Kernel engineering
> http://free-electrons.com


Thanks,
Yong

Maxime Ripard Aug. 25, 2017, 1:41 p.m. UTC | #24

Hi Yong,

On Wed, Aug 23, 2017 at 10:32:16AM +0800, Yong wrote:
> > > > > +static int sun6i_graph_notify_complete(struct v4l2_async_notifier *notifier)
> > > > > +{
> > > > > +	struct sun6i_csi *csi =
> > > > > +			container_of(notifier, struct sun6i_csi, notifier);
> > > > > +	struct sun6i_graph_entity *entity;
> > > > > +	int ret;
> > > > > +
> > > > > +	dev_dbg(csi->dev, "notify complete, all subdevs registered\n");
> > > > > +
> > > > > +	/* Create links for every entity. */
> > > > > +	list_for_each_entry(entity, &csi->entities, list) {
> > > > > +		ret = sun6i_graph_build_one(csi, entity);
> > > > > +		if (ret < 0)
> > > > > +			return ret;
> > > > > +	}
> > > > > +
> > > > > +	/* Create links for video node. */
> > > > > +	ret = sun6i_graph_build_video(csi);
> > > > > +	if (ret < 0)
> > > > > +		return ret;
> > > > 
> > > > Can you elaborate a bit on the difference between a node parsed with
> > > > _graph_build_one and _graph_build_video? Can't you just store the
> > > > remote sensor when you build the notifier, and reuse it here?
> > > 
> > > There maybe many usercases:
> > > 1. CSI->Sensor.
> > > 2. CSI->MIPI->Sensor.
> > > 3. CSI->FPGA->Sensor1
> > >             ->Sensor2.
> > > FPGA maybe some other video processor. FPGA, MIPI, Sensor can be
> > > registered as v4l2 subdevs. We do not care about the driver code
> > > of them. But they should be linked together here.
> > > 
> > > So, the _graph_build_one is used to link CSI port and subdevs. 
> > > _graph_build_video is used to link CSI port and video node.
> > 
> > So the graph_build_one is for the two first cases, and the
> > _build_video for the latter case?
> 
> No. 
> The _graph_build_one is used to link the subdevs found in the device 
> tree. _build_video is used to link the closest subdev to video node.
> Video node is created in the driver, so the method to get it's pad is
> diffrent to the subdevs.

Sorry for being slow here, I'm still not sure I get it.

In summary, both the sun6i_graph_build_one and sun6i_graph_build_video
will iterate over each endpoint, will retrieve the remote entity, and
will create the media link between the CSI pad and the remote pad.

As far as I can see, there's basically two things that
sun6i_graph_build_one does that sun6i_graph_build_video doesn't:
  - It skips all the links that would connect to one of the CSI sinks
  - It skips all the links that would connect to a remote node that is
    equal to the CSI node.

I assume the latter is because you want to avoid going in an infinite
loop when you would follow one of the CSI endpoint (going to the
sensor), and then follow back the same link in the opposite
direction. Right?

I'm confused about the first one though. All the pads you create in
your driver are sink pads, so wouldn't that skip all the pads of the
CSI nodes?

Also, why do you iterate on all the CSI endpoints, when there's only
of them? You want to anticipate the future binding for devices with
multiple channels?

> > 
> > If so, you should take a look at the last iteration of the
> > subnotifiers rework by Nikas Söderlund (v4l2-async: add subnotifier
> > registration for subdevices).
> > 
> > It allows subdevs to register notifiers, and you don't have to build
> > the graph from the video device, each device and subdev can only care
> > about what's next in the pipeline, but not really what's behind it.
> > 
> > That would mean in your case that you can only deal with your single
> > CSI pad, and whatever subdev driver will use it care about its own.
> 
> Do you mean the subdevs create pad link in the notifier registered by
> themself ?

Yes.

Thanks!
Maxime

yong Aug. 28, 2017, 7 a.m. UTC | #25

Hi Maxime,

On Fri, 25 Aug 2017 15:41:14 +0200
Maxime Ripard <[e-mail]> wrote:

> Hi Yong,
> 
> On Wed, Aug 23, 2017 at 10:32:16AM +0800, Yong wrote:
> > > > > > +static int sun6i_graph_notify_complete(struct v4l2_async_notifier *notifier)
> > > > > > +{
> > > > > > +	struct sun6i_csi *csi =
> > > > > > +			container_of(notifier, struct sun6i_csi, notifier);
> > > > > > +	struct sun6i_graph_entity *entity;
> > > > > > +	int ret;
> > > > > > +
> > > > > > +	dev_dbg(csi->dev, "notify complete, all subdevs registered\n");
> > > > > > +
> > > > > > +	/* Create links for every entity. */
> > > > > > +	list_for_each_entry(entity, &csi->entities, list) {
> > > > > > +		ret = sun6i_graph_build_one(csi, entity);
> > > > > > +		if (ret < 0)
> > > > > > +			return ret;
> > > > > > +	}
> > > > > > +
> > > > > > +	/* Create links for video node. */
> > > > > > +	ret = sun6i_graph_build_video(csi);
> > > > > > +	if (ret < 0)
> > > > > > +		return ret;
> > > > > 
> > > > > Can you elaborate a bit on the difference between a node parsed with
> > > > > _graph_build_one and _graph_build_video? Can't you just store the
> > > > > remote sensor when you build the notifier, and reuse it here?
> > > > 
> > > > There maybe many usercases:
> > > > 1. CSI->Sensor.
> > > > 2. CSI->MIPI->Sensor.
> > > > 3. CSI->FPGA->Sensor1
> > > >             ->Sensor2.
> > > > FPGA maybe some other video processor. FPGA, MIPI, Sensor can be
> > > > registered as v4l2 subdevs. We do not care about the driver code
> > > > of them. But they should be linked together here.
> > > > 
> > > > So, the _graph_build_one is used to link CSI port and subdevs. 
> > > > _graph_build_video is used to link CSI port and video node.
> > > 
> > > So the graph_build_one is for the two first cases, and the
> > > _build_video for the latter case?
> > 
> > No. 
> > The _graph_build_one is used to link the subdevs found in the device 
> > tree. _build_video is used to link the closest subdev to video node.
> > Video node is created in the driver, so the method to get it's pad is
> > diffrent to the subdevs.
> 
> Sorry for being slow here, I'm still not sure I get it.
> 
> In summary, both the sun6i_graph_build_one and sun6i_graph_build_video
> will iterate over each endpoint, will retrieve the remote entity, and
> will create the media link between the CSI pad and the remote pad.
> 
> As far as I can see, there's basically two things that
> sun6i_graph_build_one does that sun6i_graph_build_video doesn't:
>   - It skips all the links that would connect to one of the CSI sinks
>   - It skips all the links that would connect to a remote node that is
>     equal to the CSI node.
> 
> I assume the latter is because you want to avoid going in an infinite
> loop when you would follow one of the CSI endpoint (going to the
> sensor), and then follow back the same link in the opposite
> direction. Right?

Not exactly. But any way, some code is true redundant here. I will 
make some improve.

> 
> I'm confused about the first one though. All the pads you create in
> your driver are sink pads, so wouldn't that skip all the pads of the
> CSI nodes?
> 
> Also, why do you iterate on all the CSI endpoints, when there's only
> of them? You want to anticipate the future binding for devices with
> multiple channels?
> 
> > > 
> > > If so, you should take a look at the last iteration of the
> > > subnotifiers rework by Nikas Söderlund (v4l2-async: add subnotifier
> > > registration for subdevices).
> > > 
> > > It allows subdevs to register notifiers, and you don't have to build
> > > the graph from the video device, each device and subdev can only care
> > > about what's next in the pipeline, but not really what's behind it.
> > > 
> > > That would mean in your case that you can only deal with your single
> > > CSI pad, and whatever subdev driver will use it care about its own.
> > 
> > Do you mean the subdevs create pad link in the notifier registered by
> > themself ?
> 
> Yes.
> 
> Thanks!
> Maxime
> 
> -- 
> Maxime Ripard, Free Electrons
> Embedded Linux and Kernel engineering
> http://free-electrons.com


Thanks,
Yong

Ondřej Jirman Sept. 21, 2017, 1:45 p.m. UTC | #26

Hello Yong,

I noticed one issue in the register macros. See below.

Yong Deng píše v Čt 27. 07. 2017 v 13:01 +0800:
> Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> and CSI1 is used for parallel interface. This is not documented in
> datasheet but by testing and guess.
> 
> This patch implement a v4l2 framework driver for it.
> 
> Currently, the driver only support the parallel interface. MIPI-CSI2,
> ISP's support are not included in this patch.
> 
> Signed-off-by: Yong Deng <[e-mail]>
> ---
> 

[snip]

> +
> +#define CSI_CH_INT_EN_REG		0x70
> +#define CSI_CH_INT_EN_VS_INT_EN			BIT(7)
> +#define CSI_CH_INT_EN_HB_OF_INT_EN		BIT(6)
> +#define CSI_CH_INT_EN_MUL_ERR_INT_EN		BIT(5)
> +#define CSI_CH_INT_EN_FIFO2_OF_INT_EN		BIT(4)
> +#define CSI_CH_INT_EN_FIFO1_OF_INT_EN		BIT(3)
> +#define CSI_CH_INT_EN_FIFO0_OF_INT_EN		BIT(2)
> +#define CSI_CH_INT_EN_FD_INT_EN			BIT(1)
> +#define CSI_CH_INT_EN_CD_INT_EN			BIT(0)
> +
> +#define CSI_CH_INT_STA_REG		0x74
> +#define CSI_CH_INT_STA_VS_PD			BIT(7)
> +#define CSI_CH_INT_STA_HB_OF_PD			BIT(6)
> +#define CSI_CH_INT_STA_MUL_ERR_PD		BIT(5)
> +#define CSI_CH_INT_STA_FIFO2_OF_PD		BIT(4)
> +#define CSI_CH_INT_STA_FIFO1_OF_PD		BIT(3)
> +#define CSI_CH_INT_STA_FIFO0_OF_PD		BIT(2)
> +#define CSI_CH_INT_STA_FD_PD			BIT(1)
> +#define CSI_CH_INT_STA_CD_PD			BIT(0)
> +
> +#define CSI_CH_FLD1_VSIZE_REG		0x74

This register should be 0x78 according to the V3s manual. Though it's
not used in your driver yet, so it is not yet causing any issues.

> +#define CSI_CH_HSIZE_REG		0x80
> +#define CSI_CH_HSIZE_HOR_LEN_MASK		GENMASK(28, 16)
> +#define CSI_CH_HSIZE_HOR_LEN(len)		((len << 16) & CSI_CH_HSIZE_HOR_LEN_MASK)
> +#define CSI_CH_HSIZE_HOR_START_MASK		GENMASK(12, 0)
> +#define CSI_CH_HSIZE_HOR_START(start)		((start << 0) & CSI_CH_HSIZE_HOR_START_MASK)
> +
> +#define CSI_CH_VSIZE_REG		0x84
> +#define CSI_CH_VSIZE_VER_LEN_MASK		GENMASK(28, 16)
> +#define CSI_CH_VSIZE_VER_LEN(len)		((len << 16) & CSI_CH_VSIZE_VER_LEN_MASK)
> +#define CSI_CH_VSIZE_VER_START_MASK		GENMASK(12, 0)
> +#define CSI_CH_VSIZE_VER_START(start)		((start << 0) & CSI_CH_VSIZE_VER_START_MASK)
> +
> +#define CSI_CH_BUF_LEN_REG		0x88
> +#define CSI_CH_BUF_LEN_BUF_LEN_C_MASK		GENMASK(29, 16)
> +#define CSI_CH_BUF_LEN_BUF_LEN_C(len)		((len << 16) & CSI_CH_BUF_LEN_BUF_LEN_C_MASK)
> +#define CSI_CH_BUF_LEN_BUF_LEN_Y_MASK		GENMASK(13, 0)
> +#define CSI_CH_BUF_LEN_BUF_LEN_Y(len)		((len << 0) & CSI_CH_BUF_LEN_BUF_LEN_Y_MASK)
> +
> +#define CSI_CH_FLIP_SIZE_REG		0x8c
> +#define CSI_CH_FLIP_SIZE_VER_LEN_MASK		GENMASK(28, 16)
> +#define CSI_CH_FLIP_SIZE_VER_LEN(len)		((len << 16) & CSI_CH_FLIP_SIZE_VER_LEN_MASK)
> +#define CSI_CH_FLIP_SIZE_VALID_LEN_MASK		GENMASK(12, 0)
> +#define CSI_CH_FLIP_SIZE_VALID_LEN(len)		((len << 0) & CSI_CH_FLIP_SIZE_VALID_LEN_MASK)
> +
> +#define CSI_CH_FRM_CLK_CNT_REG		0x90
> +#define CSI_CH_ACC_ITNL_CLK_CNT_REG	0x94
> +#define CSI_CH_FIFO_STAT_REG		0x98
> +#define CSI_CH_PCLK_STAT_REG		0x9c
> +
> +/*
> + * csi input data format
> + */
> +enum csi_input_fmt
> +{
> +	CSI_INPUT_FORMAT_RAW		= 0,
> +	CSI_INPUT_FORMAT_YUV422		= 3,
> +	CSI_INPUT_FORMAT_YUV420		= 4,
> +};
> +
> +/*
> + * csi output data format
> + */
> +enum csi_output_fmt
> +{
> +	/* only when input format is RAW */
> +	CSI_FIELD_RAW_8			= 0,
> +	CSI_FIELD_RAW_10		= 1,
> +	CSI_FIELD_RAW_12		= 2,
> +	CSI_FIELD_RGB565		= 4,
> +	CSI_FIELD_RGB888		= 5,
> +	CSI_FIELD_PRGB888		= 6,
> +	CSI_FRAME_RAW_8			= 8,
> +	CSI_FRAME_RAW_10		= 9,
> +	CSI_FRAME_RAW_12		= 10,
> +	CSI_FRAME_RGB565		= 12,
> +	CSI_FRAME_RGB888		= 13,
> +	CSI_FRAME_PRGB888		= 14,
> +
> +	/* only when input format is YUV422/YUV420 */

Other limitation is that when input is YUV420 output can only be YUV420
and not YUV422.

> +	CSI_FIELD_PLANAR_YUV422		= 0,
> +	CSI_FIELD_PLANAR_YUV420		= 1,
> +	CSI_FRAME_PLANAR_YUV420		= 2,
> +	CSI_FRAME_PLANAR_YUV422		= 3,
> +	CSI_FIELD_UV_CB_YUV422		= 4,
> +	CSI_FIELD_UV_CB_YUV420		= 5,
> +	CSI_FRAME_UV_CB_YUV420		= 6,
> +	CSI_FRAME_UV_CB_YUV422		= 7,
> +	CSI_FIELD_MB_YUV422		= 8,
> +	CSI_FIELD_MB_YUV420		= 9,
> +	CSI_FRAME_MB_YUV420		= 10,
> +	CSI_FRAME_MB_YUV422		= 11,
> +	CSI_FIELD_UV_CB_YUV422_10	= 12,
> +	CSI_FIELD_UV_CB_YUV420_10	= 13,
> +};
> +

thank you and regards,
  Ondrej

Mylene JOSSERAND Sept. 22, 2017, 8:44 a.m. UTC | #27

Hello Yong,

Thank you for these drivers!

I tested it with an OV5640 camera on an Nanopi M1 plus (Allwinner H3)
and I noticed that I got a frame correctly displayed only on a half of
the frame's size.

It is related to your "sun6i_csi_set_window" function (see
below).

> Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> and CSI1 is used for parallel interface. This is not documented in
> datasheet but by testing and guess.
> 
> This patch implement a v4l2 framework driver for it.
> 
> Currently, the driver only support the parallel interface. MIPI-CSI2,
> ISP's support are not included in this patch.
> 
> Signed-off-by: Yong Deng <[e-mail]>
> ---
>  drivers/media/platform/Kconfig                   |   1 +
>  drivers/media/platform/Makefile                  |   2 +
>  drivers/media/platform/sun6i-csi/Kconfig         |   9 +
>  drivers/media/platform/sun6i-csi/Makefile        |   3 +
>  drivers/media/platform/sun6i-csi/sun6i_csi.c     | 545
> +++++++++++++++ drivers/media/platform/sun6i-csi/sun6i_csi.h     |
> 203 ++++++ drivers/media/platform/sun6i-csi/sun6i_csi_v3s.c | 827
> +++++++++++++++++++++++
> drivers/media/platform/sun6i-csi/sun6i_csi_v3s.h | 206 ++++++
> drivers/media/platform/sun6i-csi/sun6i_video.c   | 663
> ++++++++++++++++++ drivers/media/platform/sun6i-csi/sun6i_video.h
> |  61 ++ 10 files changed, 2520 insertions(+) create mode 100644
> drivers/media/platform/sun6i-csi/Kconfig create mode 100644
> drivers/media/platform/sun6i-csi/Makefile create mode 100644
> drivers/media/platform/sun6i-csi/sun6i_csi.c create mode 100644
> drivers/media/platform/sun6i-csi/sun6i_csi.h create mode 100644
> drivers/media/platform/sun6i-csi/sun6i_csi_v3s.c create mode 100644
> drivers/media/platform/sun6i-csi/sun6i_csi_v3s.h create mode 100644
> drivers/media/platform/sun6i-csi/sun6i_video.c create mode 100644
> drivers/media/platform/sun6i-csi/sun6i_video.h
> 
> diff --git a/drivers/media/platform/Kconfig
> b/drivers/media/platform/Kconfig index 0c741d1..8371a87 100644
> --- a/drivers/media/platform/Kconfig
> +++ b/drivers/media/platform/Kconfig
> @@ -143,6 +143,7 @@ source "drivers/media/platform/am437x/Kconfig"
>  source "drivers/media/platform/xilinx/Kconfig"
>  source "drivers/media/platform/rcar-vin/Kconfig"
>  source "drivers/media/platform/atmel/Kconfig"
> +source "drivers/media/platform/sun6i-csi/Kconfig"
>  

<snip>

> +static void sun6i_csi_set_format(struct sun6i_csi_dev *sdev)
> +{
> +	struct sun6i_csi *csi = &sdev->csi;
> +	u32 cfg;
> +	u32 val;
> +
> +	regmap_read(sdev->regmap, CSI_CH_CFG_REG, &cfg);
> +
> +	cfg &= ~(CSI_CH_CFG_INPUT_FMT_MASK |
> +		 CSI_CH_CFG_OUTPUT_FMT_MASK | CSI_CH_CFG_VFLIP_EN |
> +		 CSI_CH_CFG_HFLIP_EN | CSI_CH_CFG_FIELD_SEL_MASK |
> +		 CSI_CH_CFG_INPUT_SEQ_MASK);
> +
> +	val = get_csi_input_format(csi->config.code,
> csi->config.pixelformat);
> +	cfg |= CSI_CH_CFG_INPUT_FMT(val);
> +
> +	val = get_csi_output_format(csi->config.code,
> csi->config.field);
> +	cfg |= CSI_CH_CFG_OUTPUT_FMT(val);
> +
> +	val = get_csi_input_seq(csi->config.code,
> csi->config.pixelformat);
> +	cfg |= CSI_CH_CFG_INPUT_SEQ(val);
> +
> +	if (csi->config.field == V4L2_FIELD_TOP)
> +		cfg |= CSI_CH_CFG_FIELD_SEL_FIELD0;
> +	else if (csi->config.field == V4L2_FIELD_BOTTOM)
> +		cfg |= CSI_CH_CFG_FIELD_SEL_FIELD1;
> +	else
> +		cfg |= CSI_CH_CFG_FIELD_SEL_BOTH;
> +
> +	regmap_write(sdev->regmap, CSI_CH_CFG_REG, cfg);
> +}
> +
> +static void sun6i_csi_set_window(struct sun6i_csi_dev *sdev)
> +{
> +	struct sun6i_csi_config *config = &sdev->csi.config;
> +	u32 bytesperline_y;
> +	u32 bytesperline_c;
> +	int *planar_offset = sdev->planar_offset;
> +
> +	regmap_write(sdev->regmap, CSI_CH_HSIZE_REG,
> +		     CSI_CH_HSIZE_HOR_LEN(config->width) |
> +		     CSI_CH_HSIZE_HOR_START(0));
> +	regmap_write(sdev->regmap, CSI_CH_VSIZE_REG,
> +		     CSI_CH_VSIZE_VER_LEN(config->height) |
> +		     CSI_CH_VSIZE_VER_START(0));

In my case, the HOR_LEN and VER_LEN were not correctly configured.

They were configured to width and height (640 * 480) but as I was
using a YUYV format, the pixel's size is 2 bytes so the
horizontal/vertical lines' lengths were divided by 2.

Currently, I fixed that by getting the number of bytes per pixel with
"v4l2_pixformat_get_bpp()":

+       int bytes_pixel;
+
+       bytes_pixel = v4l2_pixformat_get_bpp(config->pixelformat) / 8;
 
        regmap_write(sdev->regmap, CSI_CH_HSIZE_REG,
-                    CSI_CH_HSIZE_HOR_LEN(config->width) |
+                    CSI_CH_HSIZE_HOR_LEN(config->width * bytes_pixel) |
                     CSI_CH_HSIZE_HOR_START(0));
        regmap_write(sdev->regmap, CSI_CH_VSIZE_REG,
-                    CSI_CH_VSIZE_VER_LEN(config->height) |
+                    CSI_CH_VSIZE_VER_LEN(config->height * bytes_pixel)
  | CSI_CH_VSIZE_VER_START(0));

There is certainly a nicer way to handle that.

> +
> +	planar_offset[0] = 0;
> +	switch(config->pixelformat) {
> +	case V4L2_PIX_FMT_HM12:
> +	case V4L2_PIX_FMT_NV12:
> +	case V4L2_PIX_FMT_NV21:
> +	case V4L2_PIX_FMT_NV16:
> +	case V4L2_PIX_FMT_NV61:
> +		bytesperline_y = config->width;
> +		bytesperline_c = config->width;
> +		planar_offset[1] = bytesperline_y * config->height;
> +		planar_offset[2] = -1;
> +		break;
> +	case V4L2_PIX_FMT_YUV420:
> +	case V4L2_PIX_FMT_YVU420:
> +		bytesperline_y = config->width;
> +		bytesperline_c = config->width / 2;
> +		planar_offset[1] = bytesperline_y * config->height;
> +		planar_offset[2] = planar_offset[1] +
> +				bytesperline_c * config->height / 2;
> +		break;
> +	case V4L2_PIX_FMT_YUV422P:
> +		bytesperline_y = config->width;
> +		bytesperline_c = config->width / 2;
> +		planar_offset[1] = bytesperline_y * config->height;
> +		planar_offset[2] = planar_offset[1] +
> +				bytesperline_c * config->height;
> +		break;
> +	default: /* raw */
> +		bytesperline_y =
> (v4l2_pixformat_get_bpp(config->pixelformat) *
> +				  config->width) / 8;
> +		bytesperline_c = 0;
> +		planar_offset[1] = -1;
> +		planar_offset[2] = -1;
> +		break;
> +	}
> +
> +	regmap_write(sdev->regmap, CSI_CH_BUF_LEN_REG,
> +		     CSI_CH_BUF_LEN_BUF_LEN_C(bytesperline_c) |
> +		     CSI_CH_BUF_LEN_BUF_LEN_Y(bytesperline_y));
> +}
> +
> +static int get_supported_pixformats(struct sun6i_csi *csi,
> +				    const u32 **pixformats)
> +{
> +	if (pixformats != NULL)
> +		*pixformats = supported_pixformats;
> +
> +	return ARRAY_SIZE(supported_pixformats);
> +}
> +
> +static bool is_format_support(struct sun6i_csi *csi, u32 pixformat,
> +			      u32 mbus_code)
> +{
> +	struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> +
> +	return __is_format_support(sdev, pixformat, mbus_code);
> +}
> +
> +static int set_power(struct sun6i_csi *csi, bool enable)
> +{
> +	struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> +	struct regmap *regmap = sdev->regmap;
> +	int ret;
> +
> +	if (!enable) {
> +		regmap_update_bits(regmap, CSI_EN_REG,
> CSI_EN_CSI_EN, 0); +
> +		clk_disable_unprepare(sdev->clk_ram);
> +		clk_disable_unprepare(sdev->clk_mod);
> +		clk_disable_unprepare(sdev->clk_ahb);
> +		reset_control_assert(sdev->rstc_ahb);
> +		return 0;
> +	}
> +
> +	ret = clk_prepare_enable(sdev->clk_ahb);
> +	if (ret) {
> +		dev_err(sdev->dev, "Enable ahb clk err %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = clk_prepare_enable(sdev->clk_mod);
> +	if (ret) {
> +		dev_err(sdev->dev, "Enable csi clk err %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = clk_prepare_enable(sdev->clk_ram);
> +	if (ret) {
> +		dev_err(sdev->dev, "Enable clk_dram_csi clk err
> %d\n", ret);
> +		return ret;
> +	}
> +
> +	if (!IS_ERR_OR_NULL(sdev->rstc_ahb)) {
> +		ret = reset_control_deassert(sdev->rstc_ahb);
> +		if (ret) {
> +			dev_err(sdev->dev, "reset err %d\n", ret);
> +			return ret;
> +		}
> +	}
> +
> +	regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN,
> CSI_EN_CSI_EN); +
> +	return 0;
> +}

<snip>

Thank you in advance!

Best regards,

yong Sept. 22, 2017, 9:08 a.m. UTC | #28

Hello Mylène,

On Fri, 22 Sep 2017 10:44:13 +0200
Mylene JOSSERAND <[e-mail]> wrote:

> Hello Yong,
> 
> Thank you for these drivers!
> 
> I tested it with an OV5640 camera on an Nanopi M1 plus (Allwinner H3)
> and I noticed that I got a frame correctly displayed only on a half of
> the frame's size.
> 
> It is related to your "sun6i_csi_set_window" function (see
> below).
> 
> > Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> > and CSI1 is used for parallel interface. This is not documented in
> > datasheet but by testing and guess.
> > 
> > This patch implement a v4l2 framework driver for it.
> > 
> > Currently, the driver only support the parallel interface. MIPI-CSI2,
> > ISP's support are not included in this patch.
> > 
> > Signed-off-by: Yong Deng <[e-mail]>
> > ---
> >  drivers/media/platform/Kconfig                   |   1 +
> >  drivers/media/platform/Makefile                  |   2 +
> >  drivers/media/platform/sun6i-csi/Kconfig         |   9 +
> >  drivers/media/platform/sun6i-csi/Makefile        |   3 +
> >  drivers/media/platform/sun6i-csi/sun6i_csi.c     | 545
> > +++++++++++++++ drivers/media/platform/sun6i-csi/sun6i_csi.h     |
> > 203 ++++++ drivers/media/platform/sun6i-csi/sun6i_csi_v3s.c | 827
> > +++++++++++++++++++++++
> > drivers/media/platform/sun6i-csi/sun6i_csi_v3s.h | 206 ++++++
> > drivers/media/platform/sun6i-csi/sun6i_video.c   | 663
> > ++++++++++++++++++ drivers/media/platform/sun6i-csi/sun6i_video.h
> > |  61 ++ 10 files changed, 2520 insertions(+) create mode 100644
> > drivers/media/platform/sun6i-csi/Kconfig create mode 100644
> > drivers/media/platform/sun6i-csi/Makefile create mode 100644
> > drivers/media/platform/sun6i-csi/sun6i_csi.c create mode 100644
> > drivers/media/platform/sun6i-csi/sun6i_csi.h create mode 100644
> > drivers/media/platform/sun6i-csi/sun6i_csi_v3s.c create mode 100644
> > drivers/media/platform/sun6i-csi/sun6i_csi_v3s.h create mode 100644
> > drivers/media/platform/sun6i-csi/sun6i_video.c create mode 100644
> > drivers/media/platform/sun6i-csi/sun6i_video.h
> > 
> > diff --git a/drivers/media/platform/Kconfig
> > b/drivers/media/platform/Kconfig index 0c741d1..8371a87 100644
> > --- a/drivers/media/platform/Kconfig
> > +++ b/drivers/media/platform/Kconfig
> > @@ -143,6 +143,7 @@ source "drivers/media/platform/am437x/Kconfig"
> >  source "drivers/media/platform/xilinx/Kconfig"
> >  source "drivers/media/platform/rcar-vin/Kconfig"
> >  source "drivers/media/platform/atmel/Kconfig"
> > +source "drivers/media/platform/sun6i-csi/Kconfig"
> >  
> 
> <snip>
> 
> > +static void sun6i_csi_set_format(struct sun6i_csi_dev *sdev)
> > +{
> > +	struct sun6i_csi *csi = &sdev->csi;
> > +	u32 cfg;
> > +	u32 val;
> > +
> > +	regmap_read(sdev->regmap, CSI_CH_CFG_REG, &cfg);
> > +
> > +	cfg &= ~(CSI_CH_CFG_INPUT_FMT_MASK |
> > +		 CSI_CH_CFG_OUTPUT_FMT_MASK | CSI_CH_CFG_VFLIP_EN |
> > +		 CSI_CH_CFG_HFLIP_EN | CSI_CH_CFG_FIELD_SEL_MASK |
> > +		 CSI_CH_CFG_INPUT_SEQ_MASK);
> > +
> > +	val = get_csi_input_format(csi->config.code,
> > csi->config.pixelformat);
> > +	cfg |= CSI_CH_CFG_INPUT_FMT(val);
> > +
> > +	val = get_csi_output_format(csi->config.code,
> > csi->config.field);
> > +	cfg |= CSI_CH_CFG_OUTPUT_FMT(val);
> > +
> > +	val = get_csi_input_seq(csi->config.code,
> > csi->config.pixelformat);
> > +	cfg |= CSI_CH_CFG_INPUT_SEQ(val);
> > +
> > +	if (csi->config.field == V4L2_FIELD_TOP)
> > +		cfg |= CSI_CH_CFG_FIELD_SEL_FIELD0;
> > +	else if (csi->config.field == V4L2_FIELD_BOTTOM)
> > +		cfg |= CSI_CH_CFG_FIELD_SEL_FIELD1;
> > +	else
> > +		cfg |= CSI_CH_CFG_FIELD_SEL_BOTH;
> > +
> > +	regmap_write(sdev->regmap, CSI_CH_CFG_REG, cfg);
> > +}
> > +
> > +static void sun6i_csi_set_window(struct sun6i_csi_dev *sdev)
> > +{
> > +	struct sun6i_csi_config *config = &sdev->csi.config;
> > +	u32 bytesperline_y;
> > +	u32 bytesperline_c;
> > +	int *planar_offset = sdev->planar_offset;
> > +
> > +	regmap_write(sdev->regmap, CSI_CH_HSIZE_REG,
> > +		     CSI_CH_HSIZE_HOR_LEN(config->width) |
> > +		     CSI_CH_HSIZE_HOR_START(0));
> > +	regmap_write(sdev->regmap, CSI_CH_VSIZE_REG,
> > +		     CSI_CH_VSIZE_VER_LEN(config->height) |
> > +		     CSI_CH_VSIZE_VER_START(0));
> 
> In my case, the HOR_LEN and VER_LEN were not correctly configured.
> 
> They were configured to width and height (640 * 480) but as I was
> using a YUYV format, the pixel's size is 2 bytes so the
> horizontal/vertical lines' lengths were divided by 2.
> 
> Currently, I fixed that by getting the number of bytes per pixel with
> "v4l2_pixformat_get_bpp()":
> 
> +       int bytes_pixel;
> +
> +       bytes_pixel = v4l2_pixformat_get_bpp(config->pixelformat) / 8;
>  
>         regmap_write(sdev->regmap, CSI_CH_HSIZE_REG,
> -                    CSI_CH_HSIZE_HOR_LEN(config->width) |
> +                    CSI_CH_HSIZE_HOR_LEN(config->width * bytes_pixel) |
>                      CSI_CH_HSIZE_HOR_START(0));
>         regmap_write(sdev->regmap, CSI_CH_VSIZE_REG,
> -                    CSI_CH_VSIZE_VER_LEN(config->height) |
> +                    CSI_CH_VSIZE_VER_LEN(config->height * bytes_pixel)
>   | CSI_CH_VSIZE_VER_START(0));
> 
> There is certainly a nicer way to handle that.

The datasheet documents CSI_CH_HSIZE_HOR_LEN and CSI_CH_VSIZE_VER_LEN's 
unit is pixel. And I had tested the YUYV format on V3s and that's OK.
Another register CSI_CH_BUF_LEN_REG's unit is byte.

> 
> > +
> > +	planar_offset[0] = 0;
> > +	switch(config->pixelformat) {
> > +	case V4L2_PIX_FMT_HM12:
> > +	case V4L2_PIX_FMT_NV12:
> > +	case V4L2_PIX_FMT_NV21:
> > +	case V4L2_PIX_FMT_NV16:
> > +	case V4L2_PIX_FMT_NV61:
> > +		bytesperline_y = config->width;
> > +		bytesperline_c = config->width;
> > +		planar_offset[1] = bytesperline_y * config->height;
> > +		planar_offset[2] = -1;
> > +		break;
> > +	case V4L2_PIX_FMT_YUV420:
> > +	case V4L2_PIX_FMT_YVU420:
> > +		bytesperline_y = config->width;
> > +		bytesperline_c = config->width / 2;
> > +		planar_offset[1] = bytesperline_y * config->height;
> > +		planar_offset[2] = planar_offset[1] +
> > +				bytesperline_c * config->height / 2;
> > +		break;
> > +	case V4L2_PIX_FMT_YUV422P:
> > +		bytesperline_y = config->width;
> > +		bytesperline_c = config->width / 2;
> > +		planar_offset[1] = bytesperline_y * config->height;
> > +		planar_offset[2] = planar_offset[1] +
> > +				bytesperline_c * config->height;
> > +		break;
> > +	default: /* raw */
> > +		bytesperline_y =
> > (v4l2_pixformat_get_bpp(config->pixelformat) *
> > +				  config->width) / 8;
> > +		bytesperline_c = 0;
> > +		planar_offset[1] = -1;
> > +		planar_offset[2] = -1;
> > +		break;
> > +	}
> > +
> > +	regmap_write(sdev->regmap, CSI_CH_BUF_LEN_REG,
> > +		     CSI_CH_BUF_LEN_BUF_LEN_C(bytesperline_c) |
> > +		     CSI_CH_BUF_LEN_BUF_LEN_Y(bytesperline_y));
> > +}
> > +
> > +static int get_supported_pixformats(struct sun6i_csi *csi,
> > +				    const u32 **pixformats)
> > +{
> > +	if (pixformats != NULL)
> > +		*pixformats = supported_pixformats;
> > +
> > +	return ARRAY_SIZE(supported_pixformats);
> > +}
> > +
> > +static bool is_format_support(struct sun6i_csi *csi, u32 pixformat,
> > +			      u32 mbus_code)
> > +{
> > +	struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> > +
> > +	return __is_format_support(sdev, pixformat, mbus_code);
> > +}
> > +
> > +static int set_power(struct sun6i_csi *csi, bool enable)
> > +{
> > +	struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> > +	struct regmap *regmap = sdev->regmap;
> > +	int ret;
> > +
> > +	if (!enable) {
> > +		regmap_update_bits(regmap, CSI_EN_REG,
> > CSI_EN_CSI_EN, 0); +
> > +		clk_disable_unprepare(sdev->clk_ram);
> > +		clk_disable_unprepare(sdev->clk_mod);
> > +		clk_disable_unprepare(sdev->clk_ahb);
> > +		reset_control_assert(sdev->rstc_ahb);
> > +		return 0;
> > +	}
> > +
> > +	ret = clk_prepare_enable(sdev->clk_ahb);
> > +	if (ret) {
> > +		dev_err(sdev->dev, "Enable ahb clk err %d\n", ret);
> > +		return ret;
> > +	}
> > +
> > +	ret = clk_prepare_enable(sdev->clk_mod);
> > +	if (ret) {
> > +		dev_err(sdev->dev, "Enable csi clk err %d\n", ret);
> > +		return ret;
> > +	}
> > +
> > +	ret = clk_prepare_enable(sdev->clk_ram);
> > +	if (ret) {
> > +		dev_err(sdev->dev, "Enable clk_dram_csi clk err
> > %d\n", ret);
> > +		return ret;
> > +	}
> > +
> > +	if (!IS_ERR_OR_NULL(sdev->rstc_ahb)) {
> > +		ret = reset_control_deassert(sdev->rstc_ahb);
> > +		if (ret) {
> > +			dev_err(sdev->dev, "reset err %d\n", ret);
> > +			return ret;
> > +		}
> > +	}
> > +
> > +	regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN,
> > CSI_EN_CSI_EN); +
> > +	return 0;
> > +}
> 
> <snip>
> 
> Thank you in advance!
> 
> Best regards,
> 
> -- 
> Mylène Josserand, Free Electrons
> Embedded Linux and Kernel engineering
> http://free-electrons.com


Thanks,
Yong

Maxime Ripard Nov. 21, 2017, 3:48 p.m. UTC | #29

Hi,

On Thu, Jul 27, 2017 at 01:01:35PM +0800, Yong Deng wrote:
> Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> and CSI1 is used for parallel interface. This is not documented in
> datasheet but by testing and guess.
> 
> This patch implement a v4l2 framework driver for it.
> 
> Currently, the driver only support the parallel interface. MIPI-CSI2,
> ISP's support are not included in this patch.
> 
> Signed-off-by: Yong Deng <[e-mail]>

Thanks again for this driver.

It seems like at least this iteration is behaving in a weird way with
DMA transfers for at least YU12 and NV12 (and I would assume YV12).

Starting a transfer of multiple frames in either of these formats,
using either ffmpeg (ffmpeg -f v4l2 -video_size 640x480 -framerate 30
-i /dev/video0 output.mkv) or yavta (yavta -c80 -p -F --skip 0 -f NV12
-s 640x480 $(media-c tl -e 'sun6i-csi')) will end up in a panic.

The panic seems to be generated with random data going into parts of
the kernel memory, the pattern being in my case something like
0x8287868a which is very odd (always around 0x88)

It turns out that when you cover the sensor, the values change to
around 0x28, so it really seems like it's pixels that have been copied
there.

I've looked quickly at the DMA setup, and it seems reasonable to
me. Do you have the same issue on your side? Have you been able to
test those formats using your hardware?

Given that they all are planar formats and YUYV and the likes work
just fine, maybe we can leave them aside for now?

Thanks!
Maxime

yong Nov. 22, 2017, 1:33 a.m. UTC | #30

On Tue, 21 Nov 2017 16:48:27 +0100
Maxime Ripard <[e-mail]> wrote:

> Hi,
> 
> On Thu, Jul 27, 2017 at 01:01:35PM +0800, Yong Deng wrote:
> > Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> > and CSI1 is used for parallel interface. This is not documented in
> > datasheet but by testing and guess.
> > 
> > This patch implement a v4l2 framework driver for it.
> > 
> > Currently, the driver only support the parallel interface. MIPI-CSI2,
> > ISP's support are not included in this patch.
> > 
> > Signed-off-by: Yong Deng <[e-mail]>
> 
> Thanks again for this driver.
> 
> It seems like at least this iteration is behaving in a weird way with
> DMA transfers for at least YU12 and NV12 (and I would assume YV12).
> 
> Starting a transfer of multiple frames in either of these formats,
> using either ffmpeg (ffmpeg -f v4l2 -video_size 640x480 -framerate 30
> -i /dev/video0 output.mkv) or yavta (yavta -c80 -p -F --skip 0 -f NV12
> -s 640x480 $(media-c tl -e 'sun6i-csi')) will end up in a panic.
> 
> The panic seems to be generated with random data going into parts of
> the kernel memory, the pattern being in my case something like
> 0x8287868a which is very odd (always around 0x88)
> 
> It turns out that when you cover the sensor, the values change to
> around 0x28, so it really seems like it's pixels that have been copied
> there.
> 
> I've looked quickly at the DMA setup, and it seems reasonable to
> me. Do you have the same issue on your side? Have you been able to
> test those formats using your hardware?

I had tested the following formats with BT1120 input:
V4L2_PIX_FMT_NV12		-> NV12
V4L2_PIX_FMT_NV21		-> NV21
V4L2_PIX_FMT_NV16		-> NV16
V4L2_PIX_FMT_NV61		-> NV61
V4L2_PIX_FMT_YUV420		-> YU12
V4L2_PIX_FMT_YVU420		-> YV12
V4L2_PIX_FMT_YUV422P		-> 422P
And they all work fine.

> 
> Given that they all are planar formats and YUYV and the likes work
> just fine, maybe we can leave them aside for now?

V4L2_PIX_FMT_YUV422P and V4L2_PIX_FMT_YUYV is OK, and V4L2_PIX_FMT_NV12
is bad? It's really weird.

What's your input bus code format, type and width?

> 
> Thanks!
> Maxime
> 
> -- 
> Maxime Ripard, Free Electrons
> Embedded Linux and Kernel engineering
> http://free-electrons.com


Thanks,
Yong

Maxime Ripard Nov. 22, 2017, 9:45 a.m. UTC | #31

Hi,

On Wed, Nov 22, 2017 at 09:33:06AM +0800, Yong wrote:
> > On Thu, Jul 27, 2017 at 01:01:35PM +0800, Yong Deng wrote:
> > > Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> > > and CSI1 is used for parallel interface. This is not documented in
> > > datasheet but by testing and guess.
> > > 
> > > This patch implement a v4l2 framework driver for it.
> > > 
> > > Currently, the driver only support the parallel interface. MIPI-CSI2,
> > > ISP's support are not included in this patch.
> > > 
> > > Signed-off-by: Yong Deng <[e-mail]>
> > 
> > Thanks again for this driver.
> > 
> > It seems like at least this iteration is behaving in a weird way with
> > DMA transfers for at least YU12 and NV12 (and I would assume YV12).
> > 
> > Starting a transfer of multiple frames in either of these formats,
> > using either ffmpeg (ffmpeg -f v4l2 -video_size 640x480 -framerate 30
> > -i /dev/video0 output.mkv) or yavta (yavta -c80 -p -F --skip 0 -f NV12
> > -s 640x480 $(media-c tl -e 'sun6i-csi')) will end up in a panic.
> > 
> > The panic seems to be generated with random data going into parts of
> > the kernel memory, the pattern being in my case something like
> > 0x8287868a which is very odd (always around 0x88)
> > 
> > It turns out that when you cover the sensor, the values change to
> > around 0x28, so it really seems like it's pixels that have been copied
> > there.
> > 
> > I've looked quickly at the DMA setup, and it seems reasonable to
> > me. Do you have the same issue on your side? Have you been able to
> > test those formats using your hardware?
> 
> I had tested the following formats with BT1120 input:
> V4L2_PIX_FMT_NV12		-> NV12
> V4L2_PIX_FMT_NV21		-> NV21
> V4L2_PIX_FMT_NV16		-> NV16
> V4L2_PIX_FMT_NV61		-> NV61
> V4L2_PIX_FMT_YUV420		-> YU12
> V4L2_PIX_FMT_YVU420		-> YV12
> V4L2_PIX_FMT_YUV422P		-> 422P
> And they all work fine.

Ok, that's good to know.

> > Given that they all are planar formats and YUYV and the likes work
> > just fine, maybe we can leave them aside for now?
> 
> V4L2_PIX_FMT_YUV422P and V4L2_PIX_FMT_YUYV is OK, and V4L2_PIX_FMT_NV12
> is bad? It's really weird.
> 
> What's your input bus code format, type and width?

The sensor is an ov5640, so the MBUS code for the bus is
MEDIA_BUS_FMT_YUYV8_2X8.

Thanks!
Maxime

yong Nov. 23, 2017, 1:14 a.m. UTC | #32

Hi,

On Wed, 22 Nov 2017 10:45:26 +0100
Maxime Ripard <[e-mail]> wrote:

> Hi,
> 
> On Wed, Nov 22, 2017 at 09:33:06AM +0800, Yong wrote:
> > > On Thu, Jul 27, 2017 at 01:01:35PM +0800, Yong Deng wrote:
> > > > Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> > > > and CSI1 is used for parallel interface. This is not documented in
> > > > datasheet but by testing and guess.
> > > > 
> > > > This patch implement a v4l2 framework driver for it.
> > > > 
> > > > Currently, the driver only support the parallel interface. MIPI-CSI2,
> > > > ISP's support are not included in this patch.
> > > > 
> > > > Signed-off-by: Yong Deng <[e-mail]>
> > > 
> > > Thanks again for this driver.
> > > 
> > > It seems like at least this iteration is behaving in a weird way with
> > > DMA transfers for at least YU12 and NV12 (and I would assume YV12).
> > > 
> > > Starting a transfer of multiple frames in either of these formats,
> > > using either ffmpeg (ffmpeg -f v4l2 -video_size 640x480 -framerate 30
> > > -i /dev/video0 output.mkv) or yavta (yavta -c80 -p -F --skip 0 -f NV12
> > > -s 640x480 $(media-c tl -e 'sun6i-csi')) will end up in a panic.
> > > 
> > > The panic seems to be generated with random data going into parts of
> > > the kernel memory, the pattern being in my case something like
> > > 0x8287868a which is very odd (always around 0x88)
> > > 
> > > It turns out that when you cover the sensor, the values change to
> > > around 0x28, so it really seems like it's pixels that have been copied
> > > there.
> > > 
> > > I've looked quickly at the DMA setup, and it seems reasonable to
> > > me. Do you have the same issue on your side? Have you been able to
> > > test those formats using your hardware?
> > 
> > I had tested the following formats with BT1120 input:
> > V4L2_PIX_FMT_NV12		-> NV12
> > V4L2_PIX_FMT_NV21		-> NV21
> > V4L2_PIX_FMT_NV16		-> NV16
> > V4L2_PIX_FMT_NV61		-> NV61
> > V4L2_PIX_FMT_YUV420		-> YU12
> > V4L2_PIX_FMT_YVU420		-> YV12
> > V4L2_PIX_FMT_YUV422P		-> 422P
> > And they all work fine.
> 
> Ok, that's good to know.
> 
> > > Given that they all are planar formats and YUYV and the likes work
> > > just fine, maybe we can leave them aside for now?
> > 
> > V4L2_PIX_FMT_YUV422P and V4L2_PIX_FMT_YUYV is OK, and V4L2_PIX_FMT_NV12
> > is bad? It's really weird.
> > 
> > What's your input bus code format, type and width?
> 
> The sensor is an ov5640, so the MBUS code for the bus is
> MEDIA_BUS_FMT_YUYV8_2X8.

Did you test on V3s?
I haven't tested it with MEDIA_BUS_FMT_YUYV8_2X8.

The Allwinner CSI's DMA is definitely weird. Ondřej Jirman thought
that CSI has an internal queue (Ondřej's commit has explained in detail).
I think CSI just pick up the buffer address before the frame done 
interrupt triggered. 
The patch in attachment can deal with this. You can see if it is
useful to solve your problem.

Thanks,
Yong

Maxime Ripard Nov. 25, 2017, 4:02 p.m. UTC | #33

On Thu, Nov 23, 2017 at 09:14:44AM +0800, Yong wrote:
> > On Wed, Nov 22, 2017 at 09:33:06AM +0800, Yong wrote:
> > > > On Thu, Jul 27, 2017 at 01:01:35PM +0800, Yong Deng wrote:
> > > > > Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> > > > > and CSI1 is used for parallel interface. This is not documented in
> > > > > datasheet but by testing and guess.
> > > > > 
> > > > > This patch implement a v4l2 framework driver for it.
> > > > > 
> > > > > Currently, the driver only support the parallel interface. MIPI-CSI2,
> > > > > ISP's support are not included in this patch.
> > > > > 
> > > > > Signed-off-by: Yong Deng <[e-mail]>
> > > > 
> > > > Thanks again for this driver.
> > > > 
> > > > It seems like at least this iteration is behaving in a weird way with
> > > > DMA transfers for at least YU12 and NV12 (and I would assume YV12).
> > > > 
> > > > Starting a transfer of multiple frames in either of these formats,
> > > > using either ffmpeg (ffmpeg -f v4l2 -video_size 640x480 -framerate 30
> > > > -i /dev/video0 output.mkv) or yavta (yavta -c80 -p -F --skip 0 -f NV12
> > > > -s 640x480 $(media-c tl -e 'sun6i-csi')) will end up in a panic.
> > > > 
> > > > The panic seems to be generated with random data going into parts of
> > > > the kernel memory, the pattern being in my case something like
> > > > 0x8287868a which is very odd (always around 0x88)
> > > > 
> > > > It turns out that when you cover the sensor, the values change to
> > > > around 0x28, so it really seems like it's pixels that have been copied
> > > > there.
> > > > 
> > > > I've looked quickly at the DMA setup, and it seems reasonable to
> > > > me. Do you have the same issue on your side? Have you been able to
> > > > test those formats using your hardware?
> > > 
> > > I had tested the following formats with BT1120 input:
> > > V4L2_PIX_FMT_NV12		-> NV12
> > > V4L2_PIX_FMT_NV21		-> NV21
> > > V4L2_PIX_FMT_NV16		-> NV16
> > > V4L2_PIX_FMT_NV61		-> NV61
> > > V4L2_PIX_FMT_YUV420		-> YU12
> > > V4L2_PIX_FMT_YVU420		-> YV12
> > > V4L2_PIX_FMT_YUV422P		-> 422P
> > > And they all work fine.
> > 
> > Ok, that's good to know.
> > 
> > > > Given that they all are planar formats and YUYV and the likes work
> > > > just fine, maybe we can leave them aside for now?
> > > 
> > > V4L2_PIX_FMT_YUV422P and V4L2_PIX_FMT_YUYV is OK, and V4L2_PIX_FMT_NV12
> > > is bad? It's really weird.
> > > 
> > > What's your input bus code format, type and width?
> > 
> > The sensor is an ov5640, so the MBUS code for the bus is
> > MEDIA_BUS_FMT_YUYV8_2X8.
> 
> Did you test on V3s?

No, this is on an H3, but that would be the first difference so far.

> I haven't tested it with MEDIA_BUS_FMT_YUYV8_2X8.

Ok, it's good to know that at least it works on your end, it's useful
for us to debug things :)

> The Allwinner CSI's DMA is definitely weird. Ondřej Jirman thought
> that CSI has an internal queue (Ondřej's commit has explained in detail).
> I think CSI just pick up the buffer address before the frame done 
> interrupt triggered. 
> The patch in attachment can deal with this. You can see if it is
> useful to solve your problem.

I'll test that on monday, thanks!

Maxime

yong Dec. 4, 2017, 9:45 a.m. UTC | #34

Hi Maxime,

I just noticed that you are using the second iteration?
Have you received my third iteration?

On Sat, 25 Nov 2017 17:02:33 +0100
Maxime Ripard <[e-mail]> wrote:

> On Thu, Nov 23, 2017 at 09:14:44AM +0800, Yong wrote:
> > > On Wed, Nov 22, 2017 at 09:33:06AM +0800, Yong wrote:
> > > > > On Thu, Jul 27, 2017 at 01:01:35PM +0800, Yong Deng wrote:
> > > > > > Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> > > > > > and CSI1 is used for parallel interface. This is not documented in
> > > > > > datasheet but by testing and guess.
> > > > > > 
> > > > > > This patch implement a v4l2 framework driver for it.
> > > > > > 
> > > > > > Currently, the driver only support the parallel interface. MIPI-CSI2,
> > > > > > ISP's support are not included in this patch.
> > > > > > 
> > > > > > Signed-off-by: Yong Deng <[e-mail]>
> > > > > 
> > > > > Thanks again for this driver.
> > > > > 
> > > > > It seems like at least this iteration is behaving in a weird way with
> > > > > DMA transfers for at least YU12 and NV12 (and I would assume YV12).
> > > > > 
> > > > > Starting a transfer of multiple frames in either of these formats,
> > > > > using either ffmpeg (ffmpeg -f v4l2 -video_size 640x480 -framerate 30
> > > > > -i /dev/video0 output.mkv) or yavta (yavta -c80 -p -F --skip 0 -f NV12
> > > > > -s 640x480 $(media-c tl -e 'sun6i-csi')) will end up in a panic.
> > > > > 
> > > > > The panic seems to be generated with random data going into parts of
> > > > > the kernel memory, the pattern being in my case something like
> > > > > 0x8287868a which is very odd (always around 0x88)
> > > > > 
> > > > > It turns out that when you cover the sensor, the values change to
> > > > > around 0x28, so it really seems like it's pixels that have been copied
> > > > > there.
> > > > > 
> > > > > I've looked quickly at the DMA setup, and it seems reasonable to
> > > > > me. Do you have the same issue on your side? Have you been able to
> > > > > test those formats using your hardware?
> > > > 
> > > > I had tested the following formats with BT1120 input:
> > > > V4L2_PIX_FMT_NV12		-> NV12
> > > > V4L2_PIX_FMT_NV21		-> NV21
> > > > V4L2_PIX_FMT_NV16		-> NV16
> > > > V4L2_PIX_FMT_NV61		-> NV61
> > > > V4L2_PIX_FMT_YUV420		-> YU12
> > > > V4L2_PIX_FMT_YVU420		-> YV12
> > > > V4L2_PIX_FMT_YUV422P		-> 422P
> > > > And they all work fine.
> > > 
> > > Ok, that's good to know.
> > > 
> > > > > Given that they all are planar formats and YUYV and the likes work
> > > > > just fine, maybe we can leave them aside for now?
> > > > 
> > > > V4L2_PIX_FMT_YUV422P and V4L2_PIX_FMT_YUYV is OK, and V4L2_PIX_FMT_NV12
> > > > is bad? It's really weird.
> > > > 
> > > > What's your input bus code format, type and width?
> > > 
> > > The sensor is an ov5640, so the MBUS code for the bus is
> > > MEDIA_BUS_FMT_YUYV8_2X8.
> > 
> > Did you test on V3s?
> 
> No, this is on an H3, but that would be the first difference so far.
> 
> > I haven't tested it with MEDIA_BUS_FMT_YUYV8_2X8.
> 
> Ok, it's good to know that at least it works on your end, it's useful
> for us to debug things :)
> 
> > The Allwinner CSI's DMA is definitely weird. Ondřej Jirman thought
> > that CSI has an internal queue (Ondřej's commit has explained in detail).
> > I think CSI just pick up the buffer address before the frame done 
> > interrupt triggered. 
> > The patch in attachment can deal with this. You can see if it is
> > useful to solve your problem.
> 
> I'll test that on monday, thanks!
> 
> Maxime
> 
> -- 
> Maxime Ripard, Free Electrons
> Embedded Linux and Kernel engineering
> http://free-electrons.com


Thanks,
Yong

Maxime Ripard Dec. 15, 2017, 10:50 a.m. UTC | #35

Hi Yong,

On Mon, Dec 04, 2017 at 05:45:11PM +0800, Yong wrote:
> I just noticed that you are using the second iteration?
> Have you received my third iteration?

Sorry for the late reply, and for not coming back to you yet about
that test. No, this is still in your v2. I've definitely received your
v3, I just didn't have time to update to it yet.

But don't worry, my mail was mostly to know if you had tested that
setup on your side to try to nail down the issue on my end, not really
a review or comment that would prevent your patch from going in.

Maxime

yong Dec. 15, 2017, 11:01 a.m. UTC | #36

Hi Maxime,

On Fri, 15 Dec 2017 11:50:47 +0100
Maxime Ripard <[e-mail]> wrote:

> Hi Yong,
> 
> On Mon, Dec 04, 2017 at 05:45:11PM +0800, Yong wrote:
> > I just noticed that you are using the second iteration?
> > Have you received my third iteration?
> 
> Sorry for the late reply, and for not coming back to you yet about
> that test. No, this is still in your v2. I've definitely received your
> v3, I just didn't have time to update to it yet.
> 
> But don't worry, my mail was mostly to know if you had tested that
> setup on your side to try to nail down the issue on my end, not really
> a review or comment that would prevent your patch from going in.

I mean,
The v2 exactly has a bug which may cause the CSI writing frame to 
a wrong memory address.

BTW, should I send a new version. I have made some improve sine v3.

> 
> Maxime
> 
> -- 
> Maxime Ripard, Free Electrons
> Embedded Linux and Kernel engineering
> http://free-electrons.com


Thanks,
Yong

Maxime Ripard Dec. 15, 2017, 10:14 p.m. UTC | #37

Hi,

On Fri, Dec 15, 2017 at 07:01:40PM +0800, Yong wrote:
> Hi Maxime,
> 
> On Fri, 15 Dec 2017 11:50:47 +0100
> Maxime Ripard <[e-mail]> wrote:
> 
> > Hi Yong,
> > 
> > On Mon, Dec 04, 2017 at 05:45:11PM +0800, Yong wrote:
> > > I just noticed that you are using the second iteration?
> > > Have you received my third iteration?
> > 
> > Sorry for the late reply, and for not coming back to you yet about
> > that test. No, this is still in your v2. I've definitely received your
> > v3, I just didn't have time to update to it yet.
> > 
> > But don't worry, my mail was mostly to know if you had tested that
> > setup on your side to try to nail down the issue on my end, not really
> > a review or comment that would prevent your patch from going in.
> 
> I mean,
> The v2 exactly has a bug which may cause the CSI writing frame to 
> a wrong memory address.

Ah, sorry I misunderstood you then. I'll definitely test your v3..

> BTW, should I send a new version. I have made some improve sine v3.

.. or your v4 :)

Yes, please send a new version.

Maxime

Patch

diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
index 0c741d1..8371a87 100644
--- a/drivers/media/platform/Kconfig
+++ b/drivers/media/platform/Kconfig
@@ -143,6 +143,7 @@  source "drivers/media/platform/am437x/Kconfig"
 source "drivers/media/platform/xilinx/Kconfig"
 source "drivers/media/platform/rcar-vin/Kconfig"
 source "drivers/media/platform/atmel/Kconfig"
+source "drivers/media/platform/sun6i-csi/Kconfig"
 
 config VIDEO_TI_CAL
 	tristate "TI CAL (Camera Adaptation Layer) driver"
diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
index 9beadc7..fb2459c 100644
--- a/drivers/media/platform/Makefile
+++ b/drivers/media/platform/Makefile
@@ -86,3 +86,5 @@  obj-$(CONFIG_VIDEO_MEDIATEK_MDP)	+= mtk-mdp/
 obj-$(CONFIG_VIDEO_MEDIATEK_JPEG)	+= mtk-jpeg/
 
 obj-$(CONFIG_VIDEO_QCOM_VENUS)		+= qcom/venus/
+
+obj-$(CONFIG_VIDEO_SUN6I_CSI)		+= sun6i-csi/
diff --git a/drivers/media/platform/sun6i-csi/Kconfig b/drivers/media/platform/sun6i-csi/Kconfig
new file mode 100644
index 0000000..314188a
--- /dev/null
+++ b/drivers/media/platform/sun6i-csi/Kconfig
@@ -0,0 +1,9 @@ 
+config VIDEO_SUN6I_CSI
+	tristate "Allwinner V3s Camera Sensor Interface driver"
+	depends on VIDEO_V4L2 && COMMON_CLK && VIDEO_V4L2_SUBDEV_API && HAS_DMA
+	depends on ARCH_SUNXI || COMPILE_TEST
+	select VIDEOBUF2_DMA_CONTIG
+	select REGMAP_MMIO
+	select V4L2_FWNODE
+	---help---
+	   Support for the Allwinner Camera Sensor Interface Controller on V3s.
diff --git a/drivers/media/platform/sun6i-csi/Makefile b/drivers/media/platform/sun6i-csi/Makefile
new file mode 100644
index 0000000..a9b527b
--- /dev/null
+++ b/drivers/media/platform/sun6i-csi/Makefile
@@ -0,0 +1,3 @@ 
+sun6i-csi-y += sun6i_csi.o sun6i_video.o sun6i_csi_v3s.o
+
+obj-$(CONFIG_VIDEO_SUN6I_CSI) += sun6i-csi.o
diff --git a/drivers/media/platform/sun6i-csi/sun6i_csi.c b/drivers/media/platform/sun6i-csi/sun6i_csi.c
new file mode 100644
index 0000000..7a4bf53
--- /dev/null
+++ b/drivers/media/platform/sun6i-csi/sun6i_csi.c
@@ -0,0 +1,545 @@ 
+/*
+ * Copyright (c) 2017 Magewell Electronics Co., Ltd. (Nanjing),
+ * All rights reserved.
+ * Author: Yong Deng <[e-mail]>
+ *
+ * Based on drivers/media/platform/xilinx/xilinx-vipp.c
+ * Copyright (C) 2013-2015 Ideas on Board
+ * Copyright (C) 2013-2015 Xilinx, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/of_graph.h>
+
+#include "sun6i_csi.h"
+
+/*
+ * struct sun6i_graph_entity - Entity in the video graph
+ * @list: list entry in a graph entities list
+ * @node: the entity's DT node
+ * @entity: media entity, from the corresponding V4L2 subdev
+ * @asd: subdev asynchronous registration information
+ * @subdev: V4L2 subdev
+ */
+struct sun6i_graph_entity {
+	struct list_head		list;
+	struct device_node		*node;
+	struct media_entity		*entity;
+
+	struct v4l2_async_subdev	asd;
+	struct v4l2_subdev		*subdev;
+};
+
+/* -----------------------------------------------------------------------------
+ * Graph Management
+ */
+
+static struct sun6i_graph_entity *
+sun6i_graph_find_entity(struct sun6i_csi *csi,
+			const struct device_node *node)
+{
+	struct sun6i_graph_entity *entity;
+
+	list_for_each_entry(entity, &csi->entities, list) {
+		if (entity->node == node)
+			return entity;
+	}
+
+	return NULL;
+}
+
+static int sun6i_graph_build_one(struct sun6i_csi *csi,
+				 struct sun6i_graph_entity *entity)
+{
+	u32 link_flags = MEDIA_LNK_FL_ENABLED;
+	struct media_entity *local = entity->entity;
+	struct media_entity *remote;
+	struct media_pad *local_pad;
+	struct media_pad *remote_pad;
+	struct sun6i_graph_entity *ent;
+	struct v4l2_fwnode_link link;
+	struct device_node *ep = NULL;
+	struct device_node *next;
+	int ret = 0;
+
+	dev_dbg(csi->dev, "creating links for entity %s\n", local->name);
+
+	while (1) {
+		/* Get the next endpoint and parse its link. */
+		next = of_graph_get_next_endpoint(entity->node, ep);
+		if (next == NULL)
+			break;
+
+		of_node_put(ep);
+		ep = next;
+
+		dev_dbg(csi->dev, "processing endpoint %s\n", ep->full_name);
+
+		ret = v4l2_fwnode_parse_link(of_fwnode_handle(ep), &link);
+		if (ret < 0) {
+			dev_err(csi->dev, "failed to parse link for %s\n",
+				ep->full_name);
+			continue;
+		}
+
+		/* Skip sink ports, they will be processed from the other end of
+		 * the link.
+		 */
+		if (link.local_port >= local->num_pads) {
+			dev_err(csi->dev, "invalid port number %u on %s\n",
+				link.local_port,
+				to_of_node(link.local_node)->full_name);
+			v4l2_fwnode_put_link(&link);
+			ret = -EINVAL;
+			break;
+		}
+
+		local_pad = &local->pads[link.local_port];
+
+		if (local_pad->flags & MEDIA_PAD_FL_SINK) {
+			dev_dbg(csi->dev, "skipping sink port %s:%u\n",
+				to_of_node(link.local_node)->full_name,
+				link.local_port);
+			v4l2_fwnode_put_link(&link);
+			continue;
+		}
+
+		/* Skip video node, they will be processed separately. */
+		if (link.remote_node == of_fwnode_handle(csi->dev->of_node)) {
+			dev_dbg(csi->dev, "skipping CSI port %s:%u\n",
+				to_of_node(link.local_node)->full_name,
+				link.local_port);
+			v4l2_fwnode_put_link(&link);
+			continue;
+		}
+
+		/* Find the remote entity. */
+		ent = sun6i_graph_find_entity(csi,
+					      to_of_node(link.remote_node));
+		if (ent == NULL) {
+			dev_err(csi->dev, "no entity found for %s\n",
+				to_of_node(link.remote_node)->full_name);
+			v4l2_fwnode_put_link(&link);
+			ret = -ENODEV;
+			break;
+		}
+
+		remote = ent->entity;
+
+		if (link.remote_port >= remote->num_pads) {
+			dev_err(csi->dev, "invalid port number %u on %s\n",
+				link.remote_port,
+				to_of_node(link.remote_node)->full_name);
+			v4l2_fwnode_put_link(&link);
+			ret = -EINVAL;
+			break;
+		}
+
+		remote_pad = &remote->pads[link.remote_port];
+
+		v4l2_fwnode_put_link(&link);
+
+		/* Create the media link. */
+		dev_dbg(csi->dev, "creating %s:%u -> %s:%u link\n",
+			local->name, local_pad->index,
+			remote->name, remote_pad->index);
+
+		ret = media_create_pad_link(local, local_pad->index,
+					    remote, remote_pad->index,
+					    link_flags);
+		if (ret < 0) {
+			dev_err(csi->dev,
+				"failed to create %s:%u -> %s:%u link\n",
+				local->name, local_pad->index,
+				remote->name, remote_pad->index);
+			break;
+		}
+	}
+
+	of_node_put(ep);
+	return ret;
+}
+
+static int sun6i_graph_build_video(struct sun6i_csi *csi)
+{
+	u32 link_flags = MEDIA_LNK_FL_ENABLED;
+	struct device_node *node = csi->dev->of_node;
+	struct media_entity *source;
+	struct media_entity *sink;
+	struct media_pad *source_pad;
+	struct media_pad *sink_pad;
+	struct sun6i_graph_entity *ent;
+	struct v4l2_fwnode_link link;
+	struct device_node *ep = NULL;
+	struct device_node *next;
+	struct sun6i_video *video = &csi->video;
+	int ret = 0;
+
+	dev_dbg(csi->dev, "creating link for video node\n");
+
+	while (1) {
+		/* Get the next endpoint and parse its link. */
+		next = of_graph_get_next_endpoint(node, ep);
+		if (next == NULL)
+			break;
+
+		of_node_put(ep);
+		ep = next;
+
+		dev_dbg(csi->dev, "processing endpoint %s\n", ep->full_name);
+
+		ret = v4l2_fwnode_parse_link(of_fwnode_handle(ep), &link);
+		if (ret < 0) {
+			dev_err(csi->dev, "failed to parse link for %s\n",
+				ep->full_name);
+			continue;
+		}
+
+		/* Save the video port settings */
+		ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep),
+						 &csi->v4l2_ep);
+		if (ret) {
+			ret = -EINVAL;
+			dev_err(csi->dev, "Could not parse the endpoint\n");
+			v4l2_fwnode_put_link(&link);
+			break;
+		}
+
+		dev_dbg(csi->dev, "creating link for video node %s\n",
+			video->vdev.name);
+
+		/* Find the remote entity. */
+		ent = sun6i_graph_find_entity(csi,
+					      to_of_node(link.remote_node));
+		if (ent == NULL) {
+			dev_err(csi->dev, "no entity found for %s\n",
+				to_of_node(link.remote_node)->full_name);
+			v4l2_fwnode_put_link(&link);
+			ret = -ENODEV;
+			break;
+		}
+
+		if (link.remote_port >= ent->entity->num_pads) {
+			dev_err(csi->dev, "invalid port number %u on %s\n",
+				link.remote_port,
+				to_of_node(link.remote_node)->full_name);
+			v4l2_fwnode_put_link(&link);
+			ret = -EINVAL;
+			break;
+		}
+
+		source = ent->entity;
+		source_pad = &source->pads[link.remote_port];
+		sink = &video->vdev.entity;
+		sink_pad = &video->pad;
+
+		v4l2_fwnode_put_link(&link);
+
+		/* Create the media link. */
+		dev_dbg(csi->dev, "creating %s:%u -> %s:%u link\n",
+			source->name, source_pad->index,
+			sink->name, sink_pad->index);
+
+		ret = media_create_pad_link(source, source_pad->index,
+					    sink, sink_pad->index,
+					    link_flags);
+		if (ret < 0) {
+			dev_err(csi->dev,
+				"failed to create %s:%u -> %s:%u link\n",
+				source->name, source_pad->index,
+				sink->name, sink_pad->index);
+			break;
+		}
+
+		/* Notify video node */
+		ret = media_entity_call(sink, link_setup, sink_pad, source_pad,
+					link_flags);
+		if (ret == -ENOIOCTLCMD)
+			ret = 0;
+
+		/* found one */
+		break;
+	}
+
+	of_node_put(ep);
+	return ret;
+}
+
+static int sun6i_graph_notify_complete(struct v4l2_async_notifier *notifier)
+{
+	struct sun6i_csi *csi =
+			container_of(notifier, struct sun6i_csi, notifier);
+	struct sun6i_graph_entity *entity;
+	int ret;
+
+	dev_dbg(csi->dev, "notify complete, all subdevs registered\n");
+
+	/* Create links for every entity. */
+	list_for_each_entry(entity, &csi->entities, list) {
+		ret = sun6i_graph_build_one(csi, entity);
+		if (ret < 0)
+			return ret;
+	}
+
+	/* Create links for video node. */
+	ret = sun6i_graph_build_video(csi);
+	if (ret < 0)
+		return ret;
+
+	ret = v4l2_device_register_subdev_nodes(&csi->v4l2_dev);
+	if (ret < 0)
+		dev_err(csi->dev, "failed to register subdev nodes\n");
+
+	return media_device_register(&csi->media_dev);
+}
+
+static int sun6i_graph_notify_bound(struct v4l2_async_notifier *notifier,
+				    struct v4l2_subdev *subdev,
+				    struct v4l2_async_subdev *asd)
+{
+	struct sun6i_csi *csi =
+			container_of(notifier, struct sun6i_csi, notifier);
+	struct sun6i_graph_entity *entity;
+
+	/* Locate the entity corresponding to the bound subdev and store the
+	 * subdev pointer.
+	 */
+	list_for_each_entry(entity, &csi->entities, list) {
+		if (entity->node != subdev->dev->of_node)
+			continue;
+
+		if (entity->subdev) {
+			dev_err(csi->dev, "duplicate subdev for node %s\n",
+				entity->node->full_name);
+			return -EINVAL;
+		}
+
+		dev_dbg(csi->dev, "subdev %s bound\n", subdev->name);
+		entity->entity = &subdev->entity;
+		entity->subdev = subdev;
+		return 0;
+	}
+
+	dev_err(csi->dev, "no entity for subdev %s\n", subdev->name);
+	return -EINVAL;
+}
+
+static int sun6i_graph_parse_one(struct sun6i_csi *csi,
+				 struct device_node *node)
+{
+	struct sun6i_graph_entity *entity;
+	struct device_node *remote;
+	struct device_node *ep = NULL;
+	int ret = 0;
+
+	dev_dbg(csi->dev, "parsing node %s\n", node->full_name);
+
+	while (1) {
+		ep = of_graph_get_next_endpoint(node, ep);
+		if (ep == NULL)
+			break;
+
+		dev_dbg(csi->dev, "handling endpoint %s\n", ep->full_name);
+
+		remote = of_graph_get_remote_port_parent(ep);
+		if (remote == NULL) {
+			ret = -EINVAL;
+			break;
+		}
+
+		/* Skip entities that we have already processed. */
+		if (remote == csi->dev->of_node ||
+		    sun6i_graph_find_entity(csi, remote)) {
+			of_node_put(remote);
+			continue;
+		}
+
+		entity = devm_kzalloc(csi->dev, sizeof(*entity), GFP_KERNEL);
+		if (entity == NULL) {
+			of_node_put(remote);
+			ret = -ENOMEM;
+			break;
+		}
+
+		entity->node = remote;
+		entity->asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
+		entity->asd.match.fwnode.fwnode = of_fwnode_handle(remote);
+		list_add_tail(&entity->list, &csi->entities);
+		csi->num_subdevs++;
+	}
+
+	of_node_put(ep);
+	return ret;
+}
+
+static int sun6i_graph_parse(struct sun6i_csi *csi)
+{
+	struct sun6i_graph_entity *entity;
+	int ret;
+
+	/*
+	 * Walk the links to parse the full graph. Start by parsing the
+	 * composite node and then parse entities in turn. The list_for_each
+	 * loop will handle entities added at the end of the list while walking
+	 * the links.
+	 */
+	ret = sun6i_graph_parse_one(csi, csi->dev->of_node);
+	if (ret < 0)
+		return 0;
+
+	list_for_each_entry(entity, &csi->entities, list) {
+		ret = sun6i_graph_parse_one(csi, entity->node);
+		if (ret < 0)
+			break;
+	}
+
+	return ret;
+}
+
+static void sun6i_graph_cleanup(struct sun6i_csi *csi)
+{
+	struct sun6i_graph_entity *entityp;
+	struct sun6i_graph_entity *entity;
+
+	v4l2_async_notifier_unregister(&csi->notifier);
+
+	list_for_each_entry_safe(entity, entityp, &csi->entities, list) {
+		of_node_put(entity->node);
+		list_del(&entity->list);
+	}
+}
+
+static int sun6i_graph_init(struct sun6i_csi *csi)
+{
+	struct sun6i_graph_entity *entity;
+	struct v4l2_async_subdev **subdevs = NULL;
+	unsigned int num_subdevs;
+	unsigned int i;
+	int ret;
+
+	/* Parse the graph to extract a list of subdevice DT nodes. */
+	ret = sun6i_graph_parse(csi);
+	if (ret < 0) {
+		dev_err(csi->dev, "graph parsing failed\n");
+		goto done;
+	}
+
+	if (!csi->num_subdevs) {
+		dev_err(csi->dev, "no subdev found in graph\n");
+		goto done;
+	}
+
+	/* Register the subdevices notifier. */
+	num_subdevs = csi->num_subdevs;
+	subdevs = devm_kzalloc(csi->dev, sizeof(*subdevs) * num_subdevs,
+			       GFP_KERNEL);
+	if (subdevs == NULL) {
+		ret = -ENOMEM;
+		goto done;
+	}
+
+	i = 0;
+	list_for_each_entry(entity, &csi->entities, list)
+		subdevs[i++] = &entity->asd;
+
+	csi->notifier.subdevs = subdevs;
+	csi->notifier.num_subdevs = num_subdevs;
+	csi->notifier.bound = sun6i_graph_notify_bound;
+	csi->notifier.complete = sun6i_graph_notify_complete;
+
+	ret = v4l2_async_notifier_register(&csi->v4l2_dev, &csi->notifier);
+	if (ret < 0) {
+		dev_err(csi->dev, "notifier registration failed\n");
+		goto done;
+	}
+
+	ret = 0;
+
+done:
+	if (ret < 0)
+		sun6i_graph_cleanup(csi);
+
+	return ret;
+}
+
+/* -----------------------------------------------------------------------------
+ * Media Controller and V4L2
+ */
+
+static void sun6i_csi_v4l2_cleanup(struct sun6i_csi *csi)
+{
+	v4l2_device_unregister(&csi->v4l2_dev);
+	media_device_unregister(&csi->media_dev);
+	media_device_cleanup(&csi->media_dev);
+}
+
+static int sun6i_csi_v4l2_init(struct sun6i_csi *csi)
+{
+	int ret;
+
+	csi->media_dev.dev = csi->dev;
+	strlcpy(csi->media_dev.model, "Allwinner Video Capture Device",
+		sizeof(csi->media_dev.model));
+	csi->media_dev.hw_revision = 0;
+
+	media_device_init(&csi->media_dev);
+
+	csi->v4l2_dev.mdev = &csi->media_dev;
+	ret = v4l2_device_register(csi->dev, &csi->v4l2_dev);
+	if (ret < 0) {
+		dev_err(csi->dev, "V4L2 device registration failed (%d)\n",
+			ret);
+		media_device_cleanup(&csi->media_dev);
+		return ret;
+	}
+	return 0;
+}
+
+int sun6i_csi_init(struct sun6i_csi *csi)
+{
+	int ret;
+
+	csi->num_subdevs = 0;
+	INIT_LIST_HEAD(&csi->entities);
+
+	ret = sun6i_csi_v4l2_init(csi);
+	if (ret < 0)
+		return ret;
+
+	ret = sun6i_video_init(&csi->video, csi, "sun6i-csi");
+	if (ret < 0)
+		goto v4l2_clean;
+
+	ret = sun6i_graph_init(csi);
+	if (ret < 0)
+		goto video_clean;
+
+	return 0;
+
+video_clean:
+	sun6i_video_cleanup(&csi->video);
+v4l2_clean:
+	sun6i_csi_v4l2_cleanup(csi);
+	return ret;
+}
+
+int sun6i_csi_cleanup(struct sun6i_csi *csi)
+{
+	sun6i_video_cleanup(&csi->video);
+	sun6i_graph_cleanup(csi);
+	sun6i_csi_v4l2_cleanup(csi);
+
+	return 0;
+}
diff --git a/drivers/media/platform/sun6i-csi/sun6i_csi.h b/drivers/media/platform/sun6i-csi/sun6i_csi.h
new file mode 100644
index 0000000..167f6bc
--- /dev/null
+++ b/drivers/media/platform/sun6i-csi/sun6i_csi.h
@@ -0,0 +1,203 @@ 
+/*
+ * Copyright (c) 2017 Yong Deng <[e-mail]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __SUN6I_CSI_H__
+#define __SUN6I_CSI_H__
+
+#include <media/v4l2-device.h>
+#include <media/v4l2-fwnode.h>
+
+#include "sun6i_video.h"
+
+struct sun6i_csi;
+
+/**
+ * struct sun6i_csi_config - configs for sun6i csi
+ * @pixelformat: v4l2 pixel format (V4L2_PIX_FMT_*)
+ * @code:	media bus format code (MEDIA_BUS_FMT_*)
+ * @field:	used interlacing type (enum v4l2_field)
+ * @width:	frame width
+ * @height:	frame height
+ */
+struct sun6i_csi_config {
+	u32		pixelformat;
+	u32		code;
+	u32		field;
+	u32		width;
+	u32		height;
+};
+
+struct sun6i_csi_ops {
+	int (*get_supported_pixformats)(struct sun6i_csi *csi,
+					const u32 **pixformats);
+	bool (*is_format_support)(struct sun6i_csi *csi, u32 pixformat,
+				  u32 mbus_code);
+	int (*s_power)(struct sun6i_csi *csi, bool enable);
+	int (*update_config)(struct sun6i_csi *csi,
+			     struct sun6i_csi_config *config);
+	int (*update_buf_addr)(struct sun6i_csi *csi, dma_addr_t addr);
+	int (*s_stream)(struct sun6i_csi *csi, bool enable);
+};
+
+struct sun6i_csi {
+	struct device			*dev;
+	struct v4l2_device		v4l2_dev;
+	struct media_device		media_dev;
+
+	struct list_head		entities;
+	unsigned int			num_subdevs;
+	struct v4l2_async_notifier	notifier;
+
+	/* video port settings */
+	struct v4l2_fwnode_endpoint	v4l2_ep;
+
+	struct sun6i_csi_config		config;
+
+	struct sun6i_video		video;
+
+	struct sun6i_csi_ops		*ops;
+};
+
+int sun6i_csi_init(struct sun6i_csi *csi);
+int sun6i_csi_cleanup(struct sun6i_csi *csi);
+
+/**
+ * sun6i_csi_get_supported_pixformats() - get csi supported pixformats
+ * @csi: 	pointer to the csi
+ * @pixformats: supported pixformats return from csi
+ *
+ * @return the count of pixformats or error(< 0)
+ */
+static inline int
+sun6i_csi_get_supported_pixformats(struct sun6i_csi *csi,
+				   const u32 **pixformats)
+{
+	if (csi->ops != NULL && csi->ops->get_supported_pixformats != NULL)
+		return csi->ops->get_supported_pixformats(csi, pixformats);
+
+	return -ENOIOCTLCMD;
+}
+
+/**
+ * sun6i_csi_is_format_support() - check if the format supported by csi
+ * @csi: 	pointer to the csi
+ * @pixformat:	v4l2 pixel format (V4L2_PIX_FMT_*)
+ * @mbus_code:	media bus format code (MEDIA_BUS_FMT_*)
+ */
+static inline bool
+sun6i_csi_is_format_support(struct sun6i_csi *csi, u32 pixformat, u32 mbus_code)
+{
+	if (csi->ops != NULL && csi->ops->is_format_support != NULL)
+		return csi->ops->is_format_support(csi, pixformat, mbus_code);
+
+	return -ENOIOCTLCMD;
+}
+
+/**
+ * sun6i_csi_set_power() - power on/off the csi
+ * @csi: 	pointer to the csi
+ * @enable:	on/off
+ */
+static inline int sun6i_csi_set_power(struct sun6i_csi *csi, bool enable)
+{
+	if (csi->ops != NULL && csi->ops->s_power != NULL)
+		return csi->ops->s_power(csi, enable);
+
+	return -ENOIOCTLCMD;
+}
+
+/**
+ * sun6i_csi_update_config() - update the csi register setttings
+ * @csi: 	pointer to the csi
+ * @config:	see struct sun6i_csi_config
+ */
+static inline int
+sun6i_csi_update_config(struct sun6i_csi *csi, struct sun6i_csi_config *config)
+{
+	if (csi->ops != NULL && csi->ops->update_config != NULL)
+		return csi->ops->update_config(csi, config);
+
+	return -ENOIOCTLCMD;
+}
+
+/**
+ * sun6i_csi_update_buf_addr() - update the csi frame buffer address
+ * @csi: 	pointer to the csi
+ * @addr:	frame buffer's physical address
+ */
+static inline int sun6i_csi_update_buf_addr(struct sun6i_csi *csi,
+					    dma_addr_t addr)
+{
+	if (csi->ops != NULL && csi->ops->update_buf_addr != NULL)
+		return csi->ops->update_buf_addr(csi, addr);
+
+	return -ENOIOCTLCMD;
+}
+
+/**
+ * sun6i_csi_set_stream() - start/stop csi streaming
+ * @csi: 	pointer to the csi
+ * @enable:	start/stop
+ */
+static inline int sun6i_csi_set_stream(struct sun6i_csi *csi, bool enable)
+{
+	if (csi->ops != NULL && csi->ops->s_stream != NULL)
+		return csi->ops->s_stream(csi, enable);
+
+	return -ENOIOCTLCMD;
+}
+
+static inline int v4l2_pixformat_get_bpp(unsigned int pixformat)
+{
+	switch (pixformat) {
+	case V4L2_PIX_FMT_SBGGR8:
+	case V4L2_PIX_FMT_SGBRG8:
+	case V4L2_PIX_FMT_SGRBG8:
+	case V4L2_PIX_FMT_SRGGB8:
+		return 8;
+	case V4L2_PIX_FMT_SBGGR10:
+	case V4L2_PIX_FMT_SGBRG10:
+	case V4L2_PIX_FMT_SGRBG10:
+	case V4L2_PIX_FMT_SRGGB10:
+		return 10;
+	case V4L2_PIX_FMT_SBGGR12:
+	case V4L2_PIX_FMT_SGBRG12:
+	case V4L2_PIX_FMT_SGRBG12:
+	case V4L2_PIX_FMT_SRGGB12:
+	case V4L2_PIX_FMT_HM12:
+	case V4L2_PIX_FMT_NV12:
+	case V4L2_PIX_FMT_NV21:
+	case V4L2_PIX_FMT_YUV420:
+	case V4L2_PIX_FMT_YVU420:
+		return 12;
+	case V4L2_PIX_FMT_YUYV:
+	case V4L2_PIX_FMT_YVYU:
+	case V4L2_PIX_FMT_UYVY:
+	case V4L2_PIX_FMT_VYUY:
+	case V4L2_PIX_FMT_NV16:
+	case V4L2_PIX_FMT_NV61:
+	case V4L2_PIX_FMT_YUV422P:
+		return 16;
+	case V4L2_PIX_FMT_RGB24:
+	case V4L2_PIX_FMT_BGR24:
+		return 24;
+	case V4L2_PIX_FMT_RGB32:
+	case V4L2_PIX_FMT_BGR32:
+		return 32;
+	}
+
+	return 0;
+}
+
+#endif /* __SUN6I_CSI_H__ */
diff --git a/drivers/media/platform/sun6i-csi/sun6i_csi_v3s.c b/drivers/media/platform/sun6i-csi/sun6i_csi_v3s.c
new file mode 100644
index 0000000..f940daa
--- /dev/null
+++ b/drivers/media/platform/sun6i-csi/sun6i_csi_v3s.c
@@ -0,0 +1,827 @@ 
+/*
+ * Copyright (c) 2017 Magewell Electronics Co., Ltd. (Nanjing).
+ * All rights reserved.
+ * Author: Yong Deng <[e-mail]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/fs.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/ioctl.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <linux/sched.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+
+#include "sun6i_csi.h"
+#include "sun6i_csi_v3s.h"
+
+#define MODULE_NAME	"sun6i-csi"
+
+struct sun6i_csi_dev {
+	struct sun6i_csi		csi;
+	struct device			*dev;
+
+	struct regmap			*regmap;
+	struct clk			*clk_ahb;
+	struct clk			*clk_mod;
+	struct clk			*clk_ram;
+	struct reset_control		*rstc_ahb;
+
+	int				planar_offset[3];
+};
+
+static const u32 supported_pixformats[] = {
+	V4L2_PIX_FMT_SBGGR8,
+	V4L2_PIX_FMT_SGBRG8,
+	V4L2_PIX_FMT_SGRBG8,
+	V4L2_PIX_FMT_SRGGB8,
+	V4L2_PIX_FMT_SBGGR10,
+	V4L2_PIX_FMT_SGBRG10,
+	V4L2_PIX_FMT_SGRBG10,
+	V4L2_PIX_FMT_SRGGB10,
+	V4L2_PIX_FMT_SBGGR12,
+	V4L2_PIX_FMT_SGBRG12,
+	V4L2_PIX_FMT_SGRBG12,
+	V4L2_PIX_FMT_SRGGB12,
+	V4L2_PIX_FMT_YUYV,
+	V4L2_PIX_FMT_YVYU,
+	V4L2_PIX_FMT_UYVY,
+	V4L2_PIX_FMT_VYUY,
+	V4L2_PIX_FMT_HM12,
+	V4L2_PIX_FMT_NV12,
+	V4L2_PIX_FMT_NV21,
+	V4L2_PIX_FMT_YUV420,
+	V4L2_PIX_FMT_YVU420,
+	V4L2_PIX_FMT_NV16,
+	V4L2_PIX_FMT_NV61,
+	V4L2_PIX_FMT_YUV422P,
+};
+
+static inline struct sun6i_csi_dev *sun6i_csi_to_dev(struct sun6i_csi *csi)
+{
+	return container_of(csi, struct sun6i_csi_dev, csi);
+}
+
+/* TODO add 10&12 bit YUV, RGB support */
+static bool __is_format_support(struct sun6i_csi_dev *sdev,
+			      u32 fourcc, u32 mbus_code)
+{
+	/*
+	 * Some video receiver have capability both 8bit and 16bit.
+	 * Identify the media bus format from device tree.
+	 */
+	if (((sdev->csi.v4l2_ep.bus_type == V4L2_MBUS_PARALLEL
+	      || sdev->csi.v4l2_ep.bus_type == V4L2_MBUS_BT656)
+	     && sdev->csi.v4l2_ep.bus.parallel.bus_width == 16)
+	    || sdev->csi.v4l2_ep.bus_type == V4L2_MBUS_CSI2) {
+		switch (fourcc) {
+		case V4L2_PIX_FMT_HM12:
+		case V4L2_PIX_FMT_NV12:
+		case V4L2_PIX_FMT_NV21:
+		case V4L2_PIX_FMT_NV16:
+		case V4L2_PIX_FMT_NV61:
+		case V4L2_PIX_FMT_YUV420:
+		case V4L2_PIX_FMT_YVU420:
+		case V4L2_PIX_FMT_YUV422P:
+			switch (mbus_code) {
+			case MEDIA_BUS_FMT_UYVY8_1X16:
+			case MEDIA_BUS_FMT_VYUY8_1X16:
+			case MEDIA_BUS_FMT_YUYV8_1X16:
+			case MEDIA_BUS_FMT_YVYU8_1X16:
+				return true;
+			}
+			break;
+		}
+		return false;
+	}
+
+	switch (fourcc) {
+	case V4L2_PIX_FMT_SBGGR8:
+		if (mbus_code == MEDIA_BUS_FMT_SBGGR8_1X8)
+			return true;
+		break;
+	case V4L2_PIX_FMT_SGBRG8:
+		if (mbus_code == MEDIA_BUS_FMT_SGBRG8_1X8)
+			return true;
+		break;
+	case V4L2_PIX_FMT_SGRBG8:
+		if (mbus_code == MEDIA_BUS_FMT_SGRBG8_1X8)
+			return true;
+		break;
+	case V4L2_PIX_FMT_SRGGB8:
+		if (mbus_code == MEDIA_BUS_FMT_SRGGB8_1X8)
+			return true;
+		break;
+	case V4L2_PIX_FMT_SBGGR10:
+		if (mbus_code == MEDIA_BUS_FMT_SBGGR10_1X10)
+			return true;
+		break;
+	case V4L2_PIX_FMT_SGBRG10:
+		if (mbus_code == MEDIA_BUS_FMT_SGBRG10_1X10)
+			return true;
+		break;
+	case V4L2_PIX_FMT_SGRBG10:
+		if (mbus_code == MEDIA_BUS_FMT_SGRBG10_1X10)
+			return true;
+		break;
+	case V4L2_PIX_FMT_SRGGB10:
+		if (mbus_code == MEDIA_BUS_FMT_SRGGB10_1X10)
+			return true;
+		break;
+	case V4L2_PIX_FMT_SBGGR12:
+		if (mbus_code == MEDIA_BUS_FMT_SBGGR12_1X12)
+			return true;
+		break;
+	case V4L2_PIX_FMT_SGBRG12:
+		if (mbus_code == MEDIA_BUS_FMT_SGBRG12_1X12)
+			return true;
+		break;
+	case V4L2_PIX_FMT_SGRBG12:
+		if (mbus_code == MEDIA_BUS_FMT_SGRBG12_1X12)
+			return true;
+		break;
+	case V4L2_PIX_FMT_SRGGB12:
+		if (mbus_code == MEDIA_BUS_FMT_SRGGB12_1X12)
+			return true;
+		break;
+
+	case V4L2_PIX_FMT_YUYV:
+		if (mbus_code == MEDIA_BUS_FMT_YUYV8_2X8)
+			return true;
+		break;
+	case V4L2_PIX_FMT_YVYU:
+		if (mbus_code == MEDIA_BUS_FMT_YVYU8_2X8)
+			return true;
+		break;
+	case V4L2_PIX_FMT_UYVY:
+		if (mbus_code == MEDIA_BUS_FMT_UYVY8_2X8)
+			return true;
+		break;
+	case V4L2_PIX_FMT_VYUY:
+		if (mbus_code == MEDIA_BUS_FMT_VYUY8_2X8)
+			return true;
+		break;
+
+	case V4L2_PIX_FMT_HM12:
+	case V4L2_PIX_FMT_NV12:
+	case V4L2_PIX_FMT_NV21:
+	case V4L2_PIX_FMT_NV16:
+	case V4L2_PIX_FMT_NV61:
+	case V4L2_PIX_FMT_YUV420:
+	case V4L2_PIX_FMT_YVU420:
+	case V4L2_PIX_FMT_YUV422P:
+		switch (mbus_code) {
+		case MEDIA_BUS_FMT_UYVY8_2X8:
+		case MEDIA_BUS_FMT_VYUY8_2X8:
+		case MEDIA_BUS_FMT_YUYV8_2X8:
+		case MEDIA_BUS_FMT_YVYU8_2X8:
+			return true;
+		}
+		break;
+	}
+
+	return false;
+}
+
+static enum csi_input_fmt get_csi_input_format(u32 mbus_code, u32 pixformat)
+{
+	/* bayer */
+	if ((mbus_code & 0xF000) == 0x3000)
+		return CSI_INPUT_FORMAT_RAW;
+
+	switch (pixformat) {
+	case V4L2_PIX_FMT_YUYV:
+	case V4L2_PIX_FMT_YVYU:
+	case V4L2_PIX_FMT_UYVY:
+	case V4L2_PIX_FMT_VYUY:
+		return CSI_INPUT_FORMAT_RAW;
+	}
+
+	/* not support YUV420 input format yet */
+	return CSI_INPUT_FORMAT_YUV422;
+}
+
+static enum csi_output_fmt get_csi_output_format(u32 pixformat, u32 field)
+{
+	bool buf_interlaced = false;
+	if (field == V4L2_FIELD_INTERLACED
+	    || field == V4L2_FIELD_INTERLACED_TB
+	    || field == V4L2_FIELD_INTERLACED_BT)
+		buf_interlaced = true;
+
+	switch (pixformat) {
+	case V4L2_PIX_FMT_SBGGR8:
+	case V4L2_PIX_FMT_SGBRG8:
+	case V4L2_PIX_FMT_SGRBG8:
+	case V4L2_PIX_FMT_SRGGB8:
+		return buf_interlaced ? CSI_FRAME_RAW_8 : CSI_FIELD_RAW_8;
+	case V4L2_PIX_FMT_SBGGR10:
+	case V4L2_PIX_FMT_SGBRG10:
+	case V4L2_PIX_FMT_SGRBG10:
+	case V4L2_PIX_FMT_SRGGB10:
+		return buf_interlaced ? CSI_FRAME_RAW_10 : CSI_FIELD_RAW_10;
+	case V4L2_PIX_FMT_SBGGR12:
+	case V4L2_PIX_FMT_SGBRG12:
+	case V4L2_PIX_FMT_SGRBG12:
+	case V4L2_PIX_FMT_SRGGB12:
+		return buf_interlaced ? CSI_FRAME_RAW_12 : CSI_FIELD_RAW_12;
+
+	case V4L2_PIX_FMT_YUYV:
+	case V4L2_PIX_FMT_YVYU:
+	case V4L2_PIX_FMT_UYVY:
+	case V4L2_PIX_FMT_VYUY:
+		return buf_interlaced ? CSI_FRAME_RAW_8 : CSI_FIELD_RAW_8;
+
+	case V4L2_PIX_FMT_HM12:
+		return buf_interlaced ? CSI_FRAME_MB_YUV420 :
+					CSI_FIELD_MB_YUV420;
+	case V4L2_PIX_FMT_NV12:
+	case V4L2_PIX_FMT_NV21:
+		return buf_interlaced ? CSI_FRAME_UV_CB_YUV420 :
+					CSI_FIELD_UV_CB_YUV420;
+	case V4L2_PIX_FMT_YUV420:
+	case V4L2_PIX_FMT_YVU420:
+		return buf_interlaced ? CSI_FRAME_PLANAR_YUV420 :
+					CSI_FIELD_PLANAR_YUV420;
+	case V4L2_PIX_FMT_NV16:
+	case V4L2_PIX_FMT_NV61:
+		return buf_interlaced ? CSI_FRAME_UV_CB_YUV422 :
+					CSI_FIELD_UV_CB_YUV422;
+	case V4L2_PIX_FMT_YUV422P:
+		return buf_interlaced ? CSI_FRAME_PLANAR_YUV422 :
+					CSI_FIELD_PLANAR_YUV422;
+	}
+
+	return 0;
+}
+
+static enum csi_input_seq get_csi_input_seq(u32 mbus_code, u32 pixformat)
+{
+
+	switch (pixformat) {
+	case V4L2_PIX_FMT_HM12:
+	case V4L2_PIX_FMT_NV12:
+	case V4L2_PIX_FMT_NV16:
+	case V4L2_PIX_FMT_YUV420:
+	case V4L2_PIX_FMT_YUV422P:
+		switch(mbus_code) {
+		case MEDIA_BUS_FMT_UYVY8_2X8:
+		case MEDIA_BUS_FMT_UYVY8_1X16:
+			return CSI_INPUT_SEQ_UYVY;
+		case MEDIA_BUS_FMT_VYUY8_2X8:
+		case MEDIA_BUS_FMT_VYUY8_1X16:
+			return CSI_INPUT_SEQ_VYUY;
+		case MEDIA_BUS_FMT_YUYV8_2X8:
+		case MEDIA_BUS_FMT_YUYV8_1X16:
+			return CSI_INPUT_SEQ_YUYV;
+		case MEDIA_BUS_FMT_YVYU8_1X16:
+		case MEDIA_BUS_FMT_YVYU8_2X8:
+			return CSI_INPUT_SEQ_YVYU;
+		}
+		break;
+	case V4L2_PIX_FMT_NV21:
+	case V4L2_PIX_FMT_NV61:
+	case V4L2_PIX_FMT_YVU420:
+		switch(mbus_code) {
+		case MEDIA_BUS_FMT_UYVY8_2X8:
+		case MEDIA_BUS_FMT_UYVY8_1X16:
+			return CSI_INPUT_SEQ_VYUY;
+		case MEDIA_BUS_FMT_VYUY8_2X8:
+		case MEDIA_BUS_FMT_VYUY8_1X16:
+			return CSI_INPUT_SEQ_UYVY;
+		case MEDIA_BUS_FMT_YUYV8_2X8:
+		case MEDIA_BUS_FMT_YUYV8_1X16:
+			return CSI_INPUT_SEQ_YVYU;
+		case MEDIA_BUS_FMT_YVYU8_1X16:
+		case MEDIA_BUS_FMT_YVYU8_2X8:
+			return CSI_INPUT_SEQ_YUYV;
+		}
+		break;
+	}
+
+	return CSI_INPUT_SEQ_YUYV;
+}
+
+#ifdef DEBUG
+static void sun6i_csi_dump_regs(struct sun6i_csi_dev *sdev)
+{
+	struct regmap *regmap = sdev->regmap;
+	u32 val;
+
+	regmap_read(regmap, CSI_EN_REG, &val);
+	printk("CSI_EN_REG=0x%x\n",		val);
+	regmap_read(regmap, CSI_IF_CFG_REG, &val);
+	printk("CSI_IF_CFG_REG=0x%x\n",		val);
+	regmap_read(regmap, CSI_CAP_REG, &val);
+	printk("CSI_CAP_REG=0x%x\n",		val);
+	regmap_read(regmap, CSI_SYNC_CNT_REG, &val);
+	printk("CSI_SYNC_CNT_REG=0x%x\n",	val);
+	regmap_read(regmap, CSI_FIFO_THRS_REG, &val);
+	printk("CSI_FIFO_THRS_REG=0x%x\n",	val);
+	regmap_read(regmap, CSI_PTN_LEN_REG, &val);
+	printk("CSI_PTN_LEN_REG=0x%x\n",	val);
+	regmap_read(regmap, CSI_PTN_ADDR_REG, &val);
+	printk("CSI_PTN_ADDR_REG=0x%x\n",	val);
+	regmap_read(regmap, CSI_VER_REG, &val);
+	printk("CSI_VER_REG=0x%x\n",		val);
+	regmap_read(regmap, CSI_CH_CFG_REG, &val);
+	printk("CSI_CH_CFG_REG=0x%x\n",		val);
+	regmap_read(regmap, CSI_CH_SCALE_REG, &val);
+	printk("CSI_CH_SCALE_REG=0x%x\n",	val);
+	regmap_read(regmap, CSI_CH_F0_BUFA_REG, &val);
+	printk("CSI_CH_F0_BUFA_REG=0x%x\n",	val);
+	regmap_read(regmap, CSI_CH_F1_BUFA_REG, &val);
+	printk("CSI_CH_F1_BUFA_REG=0x%x\n",	val);
+	regmap_read(regmap, CSI_CH_F2_BUFA_REG, &val);
+	printk("CSI_CH_F2_BUFA_REG=0x%x\n",	val);
+	regmap_read(regmap, CSI_CH_STA_REG, &val);
+	printk("CSI_CH_STA_REG=0x%x\n",		val);
+	regmap_read(regmap, CSI_CH_INT_EN_REG, &val);
+	printk("CSI_CH_INT_EN_REG=0x%x\n",	val);
+	regmap_read(regmap, CSI_CH_INT_STA_REG, &val);
+	printk("CSI_CH_INT_STA_REG=0x%x\n",	val);
+	regmap_read(regmap, CSI_CH_FLD1_VSIZE_REG, &val);
+	printk("CSI_CH_FLD1_VSIZE_REG=0x%x\n",	val);
+	regmap_read(regmap, CSI_CH_HSIZE_REG, &val);
+	printk("CSI_CH_HSIZE_REG=0x%x\n",	val);
+	regmap_read(regmap, CSI_CH_VSIZE_REG, &val);
+	printk("CSI_CH_VSIZE_REG=0x%x\n",	val);
+	regmap_read(regmap, CSI_CH_BUF_LEN_REG, &val);
+	printk("CSI_CH_BUF_LEN_REG=0x%x\n",	val);
+	regmap_read(regmap, CSI_CH_FLIP_SIZE_REG, &val);
+	printk("CSI_CH_FLIP_SIZE_REG=0x%x\n",	val);
+	regmap_read(regmap, CSI_CH_FRM_CLK_CNT_REG, &val);
+	printk("CSI_CH_FRM_CLK_CNT_REG=0x%x\n",	val);
+	regmap_read(regmap, CSI_CH_ACC_ITNL_CLK_CNT_REG, &val);
+	printk("CSI_CH_ACC_ITNL_CLK_CNT_REG=0x%x\n",	val);
+	regmap_read(regmap, CSI_CH_FIFO_STAT_REG, &val);
+	printk("CSI_CH_FIFO_STAT_REG=0x%x\n",	val);
+	regmap_read(regmap, CSI_CH_PCLK_STAT_REG, &val);
+	printk("CSI_CH_PCLK_STAT_REG=0x%x\n",	val);
+}
+#endif
+
+static void sun6i_csi_setup_bus(struct sun6i_csi_dev *sdev)
+{
+	struct v4l2_fwnode_endpoint *endpoint = &sdev->csi.v4l2_ep;
+	unsigned char bus_width;
+	u32 flags;
+	u32 cfg;
+
+	bus_width = endpoint->bus.parallel.bus_width;
+
+	regmap_read(sdev->regmap, CSI_IF_CFG_REG, &cfg);
+
+	cfg &= ~(CSI_IF_CFG_CSI_IF_MASK | CSI_IF_CFG_MIPI_IF_MASK |
+		 CSI_IF_CFG_IF_DATA_WIDTH_MASK |
+		 CSI_IF_CFG_CLK_POL_MASK | CSI_IF_CFG_VREF_POL_MASK |
+		 CSI_IF_CFG_HREF_POL_MASK | CSI_IF_CFG_FIELD_MASK);
+
+	switch (endpoint->bus_type) {
+	case V4L2_MBUS_CSI2:
+		cfg |= CSI_IF_CFG_MIPI_IF_MIPI;
+		break;
+	case V4L2_MBUS_PARALLEL:
+		cfg |= CSI_IF_CFG_MIPI_IF_CSI;
+
+		flags = endpoint->bus.parallel.flags;
+
+		cfg |= (bus_width == 16) ? CSI_IF_CFG_CSI_IF_YUV422_16BIT :
+					   CSI_IF_CFG_CSI_IF_YUV422_INTLV;
+
+		if (flags & V4L2_MBUS_FIELD_EVEN_LOW)
+			cfg |= CSI_IF_CFG_FIELD_POSITIVE;
+
+		if (flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
+			cfg |= CSI_IF_CFG_VREF_POL_POSITIVE;
+		if (flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
+			cfg |= CSI_IF_CFG_HREF_POL_POSITIVE;
+
+		if (flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
+			cfg |= CSI_IF_CFG_CLK_POL_FALLING_EDGE;
+		break;
+	case V4L2_MBUS_BT656:
+		cfg |= CSI_IF_CFG_MIPI_IF_CSI;
+
+		flags = endpoint->bus.parallel.flags;
+
+		cfg |= (bus_width == 16) ? CSI_IF_CFG_CSI_IF_BT1120 :
+					   CSI_IF_CFG_CSI_IF_BT656;
+
+		if (flags & V4L2_MBUS_FIELD_EVEN_LOW)
+			cfg |= CSI_IF_CFG_FIELD_POSITIVE;
+
+		if (flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
+			cfg |= CSI_IF_CFG_CLK_POL_FALLING_EDGE;
+		break;
+	default:
+		BUG();
+		break;
+	}
+
+	switch (bus_width) {
+	case 8:
+		cfg |= CSI_IF_CFG_IF_DATA_WIDTH_8BIT;
+		break;
+	case 10:
+		cfg |= CSI_IF_CFG_IF_DATA_WIDTH_10BIT;
+		break;
+	case 12:
+		cfg |= CSI_IF_CFG_IF_DATA_WIDTH_12BIT;
+		break;
+	default:
+		break;
+	}
+
+	regmap_write(sdev->regmap, CSI_IF_CFG_REG, cfg);
+}
+
+static void sun6i_csi_set_format(struct sun6i_csi_dev *sdev)
+{
+	struct sun6i_csi *csi = &sdev->csi;
+	u32 cfg;
+	u32 val;
+
+	regmap_read(sdev->regmap, CSI_CH_CFG_REG, &cfg);
+
+	cfg &= ~(CSI_CH_CFG_INPUT_FMT_MASK |
+		 CSI_CH_CFG_OUTPUT_FMT_MASK | CSI_CH_CFG_VFLIP_EN |
+		 CSI_CH_CFG_HFLIP_EN | CSI_CH_CFG_FIELD_SEL_MASK |
+		 CSI_CH_CFG_INPUT_SEQ_MASK);
+
+	val = get_csi_input_format(csi->config.code, csi->config.pixelformat);
+	cfg |= CSI_CH_CFG_INPUT_FMT(val);
+
+	val = get_csi_output_format(csi->config.code, csi->config.field);
+	cfg |= CSI_CH_CFG_OUTPUT_FMT(val);
+
+	val = get_csi_input_seq(csi->config.code, csi->config.pixelformat);
+	cfg |= CSI_CH_CFG_INPUT_SEQ(val);
+
+	if (csi->config.field == V4L2_FIELD_TOP)
+		cfg |= CSI_CH_CFG_FIELD_SEL_FIELD0;
+	else if (csi->config.field == V4L2_FIELD_BOTTOM)
+		cfg |= CSI_CH_CFG_FIELD_SEL_FIELD1;
+	else
+		cfg |= CSI_CH_CFG_FIELD_SEL_BOTH;
+
+	regmap_write(sdev->regmap, CSI_CH_CFG_REG, cfg);
+}
+
+static void sun6i_csi_set_window(struct sun6i_csi_dev *sdev)
+{
+	struct sun6i_csi_config *config = &sdev->csi.config;
+	u32 bytesperline_y;
+	u32 bytesperline_c;
+	int *planar_offset = sdev->planar_offset;
+
+	regmap_write(sdev->regmap, CSI_CH_HSIZE_REG,
+		     CSI_CH_HSIZE_HOR_LEN(config->width) |
+		     CSI_CH_HSIZE_HOR_START(0));
+	regmap_write(sdev->regmap, CSI_CH_VSIZE_REG,
+		     CSI_CH_VSIZE_VER_LEN(config->height) |
+		     CSI_CH_VSIZE_VER_START(0));
+
+	planar_offset[0] = 0;
+	switch(config->pixelformat) {
+	case V4L2_PIX_FMT_HM12:
+	case V4L2_PIX_FMT_NV12:
+	case V4L2_PIX_FMT_NV21:
+	case V4L2_PIX_FMT_NV16:
+	case V4L2_PIX_FMT_NV61:
+		bytesperline_y = config->width;
+		bytesperline_c = config->width;
+		planar_offset[1] = bytesperline_y * config->height;
+		planar_offset[2] = -1;
+		break;
+	case V4L2_PIX_FMT_YUV420:
+	case V4L2_PIX_FMT_YVU420:
+		bytesperline_y = config->width;
+		bytesperline_c = config->width / 2;
+		planar_offset[1] = bytesperline_y * config->height;
+		planar_offset[2] = planar_offset[1] +
+				bytesperline_c * config->height / 2;
+		break;
+	case V4L2_PIX_FMT_YUV422P:
+		bytesperline_y = config->width;
+		bytesperline_c = config->width / 2;
+		planar_offset[1] = bytesperline_y * config->height;
+		planar_offset[2] = planar_offset[1] +
+				bytesperline_c * config->height;
+		break;
+	default: /* raw */
+		bytesperline_y = (v4l2_pixformat_get_bpp(config->pixelformat) *
+				  config->width) / 8;
+		bytesperline_c = 0;
+		planar_offset[1] = -1;
+		planar_offset[2] = -1;
+		break;
+	}
+
+	regmap_write(sdev->regmap, CSI_CH_BUF_LEN_REG,
+		     CSI_CH_BUF_LEN_BUF_LEN_C(bytesperline_c) |
+		     CSI_CH_BUF_LEN_BUF_LEN_Y(bytesperline_y));
+}
+
+static int get_supported_pixformats(struct sun6i_csi *csi,
+				    const u32 **pixformats)
+{
+	if (pixformats != NULL)
+		*pixformats = supported_pixformats;
+
+	return ARRAY_SIZE(supported_pixformats);
+}
+
+static bool is_format_support(struct sun6i_csi *csi, u32 pixformat,
+			      u32 mbus_code)
+{
+	struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
+
+	return __is_format_support(sdev, pixformat, mbus_code);
+}
+
+static int set_power(struct sun6i_csi *csi, bool enable)
+{
+	struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
+	struct regmap *regmap = sdev->regmap;
+	int ret;
+
+	if (!enable) {
+		regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, 0);
+
+		clk_disable_unprepare(sdev->clk_ram);
+		clk_disable_unprepare(sdev->clk_mod);
+		clk_disable_unprepare(sdev->clk_ahb);
+		reset_control_assert(sdev->rstc_ahb);
+		return 0;
+	}
+
+	ret = clk_prepare_enable(sdev->clk_ahb);
+	if (ret) {
+		dev_err(sdev->dev, "Enable ahb clk err %d\n", ret);
+		return ret;
+	}
+
+	ret = clk_prepare_enable(sdev->clk_mod);
+	if (ret) {
+		dev_err(sdev->dev, "Enable csi clk err %d\n", ret);
+		return ret;
+	}
+
+	ret = clk_prepare_enable(sdev->clk_ram);
+	if (ret) {
+		dev_err(sdev->dev, "Enable clk_dram_csi clk err %d\n", ret);
+		return ret;
+	}
+
+	if (!IS_ERR_OR_NULL(sdev->rstc_ahb)) {
+		ret = reset_control_deassert(sdev->rstc_ahb);
+		if (ret) {
+			dev_err(sdev->dev, "reset err %d\n", ret);
+			return ret;
+		}
+	}
+
+	regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, CSI_EN_CSI_EN);
+
+	return 0;
+}
+
+static int update_config(struct sun6i_csi *csi,
+			 struct sun6i_csi_config *config)
+{
+	struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
+
+	if (config == NULL)
+		return -EINVAL;
+
+	memcpy(&csi->config, config, sizeof(csi->config));
+
+	sun6i_csi_setup_bus(sdev);
+	sun6i_csi_set_format(sdev);
+	sun6i_csi_set_window(sdev);
+
+	return 0;
+}
+
+static int update_buf_addr(struct sun6i_csi *csi, dma_addr_t addr)
+{
+	struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
+	/* transform physical address to bus address */
+	dma_addr_t bus_addr = addr - 0x40000000;
+
+	regmap_write(sdev->regmap, CSI_CH_F0_BUFA_REG,
+		     (bus_addr + sdev->planar_offset[0]) >> 2);
+	if (sdev->planar_offset[1] != -1)
+		regmap_write(sdev->regmap, CSI_CH_F1_BUFA_REG,
+			     (bus_addr + sdev->planar_offset[1]) >> 2);
+	if (sdev->planar_offset[2] != -1)
+		regmap_write(sdev->regmap, CSI_CH_F2_BUFA_REG,
+			     (bus_addr + sdev->planar_offset[2]) >> 2);
+
+	return 0;
+}
+
+static int set_stream(struct sun6i_csi *csi, bool enable)
+{
+	struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
+	struct regmap *regmap = sdev->regmap;
+
+	if (!enable) {
+		regmap_update_bits(regmap, CSI_CAP_REG, CSI_CAP_CH0_VCAP_ON, 0);
+		regmap_write(regmap, CSI_CH_INT_EN_REG, 0);
+		return 0;
+	}
+
+	regmap_write(regmap, CSI_CH_INT_STA_REG, 0xFF);
+	regmap_write(regmap, CSI_CH_INT_EN_REG,
+		     CSI_CH_INT_EN_HB_OF_INT_EN |
+		     CSI_CH_INT_EN_FIFO2_OF_INT_EN |
+		     CSI_CH_INT_EN_FIFO1_OF_INT_EN |
+		     CSI_CH_INT_EN_FIFO0_OF_INT_EN |
+		     CSI_CH_INT_EN_FD_INT_EN |
+		     CSI_CH_INT_EN_CD_INT_EN);
+
+	regmap_update_bits(regmap, CSI_CAP_REG, CSI_CAP_CH0_VCAP_ON,
+			   CSI_CAP_CH0_VCAP_ON);
+
+	return 0;
+}
+
+static struct sun6i_csi_ops csi_ops = {
+	.get_supported_pixformats	= get_supported_pixformats,
+	.is_format_support		= is_format_support,
+	.s_power			= set_power,
+	.update_config			= update_config,
+	.update_buf_addr		= update_buf_addr,
+	.s_stream			= set_stream,
+};
+
+static irqreturn_t sun6i_csi_isr(int irq, void *dev_id)
+{
+	struct sun6i_csi_dev *sdev = (struct sun6i_csi_dev *)dev_id;
+	struct regmap *regmap = sdev->regmap;
+	u32 status;
+
+	regmap_read(regmap, CSI_CH_INT_STA_REG, &status);
+
+	if ((status & CSI_CH_INT_STA_FIFO0_OF_PD) ||
+	    (status & CSI_CH_INT_STA_FIFO1_OF_PD) ||
+	    (status & CSI_CH_INT_STA_FIFO2_OF_PD) ||
+	    (status & CSI_CH_INT_STA_HB_OF_PD)) {
+		regmap_write(regmap, CSI_CH_INT_STA_REG, status);
+		regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, 0);
+		regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN,
+				   CSI_EN_CSI_EN);
+		return IRQ_HANDLED;
+	}
+
+	if (status & CSI_CH_INT_STA_FD_PD) {
+		sun6i_video_frame_done(&sdev->csi.video);
+	}
+
+	regmap_write(regmap, CSI_CH_INT_STA_REG, status);
+
+	return IRQ_HANDLED;
+}
+
+static const struct regmap_config sun6i_csi_regmap_config = {
+	.reg_bits       = 32,
+	.reg_stride     = 4,
+	.val_bits       = 32,
+	.max_register	= 0x1000,
+};
+
+static int sun6i_csi_resource_request(struct sun6i_csi_dev *sdev,
+				      struct platform_device *pdev)
+{
+	struct resource *res;
+	void __iomem *io_base;
+	int ret;
+	int irq;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	io_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(io_base))
+		return PTR_ERR(io_base);
+
+	sdev->regmap = devm_regmap_init_mmio(&pdev->dev, io_base,
+					    &sun6i_csi_regmap_config);
+	if (IS_ERR(sdev->regmap)) {
+		dev_err(&pdev->dev, "Failed to init register map\n");
+		return PTR_ERR(sdev->regmap);
+	}
+
+	sdev->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
+	if (IS_ERR(sdev->clk_ahb)) {
+		dev_err(&pdev->dev, "Unable to acquire ahb clock\n");
+		return PTR_ERR(sdev->clk_ahb);
+	}
+
+	sdev->clk_mod = devm_clk_get(&pdev->dev, "mod");
+	if (IS_ERR(sdev->clk_mod)) {
+		dev_err(&pdev->dev, "Unable to acquire csi clock\n");
+		return PTR_ERR(sdev->clk_mod);
+	}
+
+	sdev->clk_ram = devm_clk_get(&pdev->dev, "ram");
+	if (IS_ERR(sdev->clk_ram)) {
+		dev_err(&pdev->dev, "Unable to acquire dram-csi clock\n");
+		return PTR_ERR(sdev->clk_ram);
+	}
+
+	sdev->rstc_ahb = devm_reset_control_get_optional_shared(&pdev->dev, NULL);
+	if (IS_ERR(sdev->rstc_ahb)) {
+		dev_err(&pdev->dev, "Cannot get reset controller\n");
+		return PTR_ERR(sdev->rstc_ahb);
+	}
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(&pdev->dev, "No csi IRQ specified\n");
+		ret = -ENXIO;
+		return ret;
+	}
+
+	ret = devm_request_irq(&pdev->dev, irq, sun6i_csi_isr, 0, MODULE_NAME,
+			       sdev);
+	if (ret) {
+		dev_err(&pdev->dev, "Cannot request csi IRQ\n");
+		return ret;
+	}
+	return 0;
+}
+
+static int sun6i_csi_probe(struct platform_device *pdev)
+{
+	struct sun6i_csi_dev *sdev;
+	int ret;
+
+	sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev), GFP_KERNEL);
+	if (!sdev)
+		return -ENOMEM;
+
+	sdev->dev = &pdev->dev;
+
+	ret = sun6i_csi_resource_request(sdev, pdev);
+	if (ret)
+		return ret;
+
+	sdev->csi.dev = &pdev->dev;
+	sdev->csi.ops = &csi_ops;
+	ret = sun6i_csi_init(&sdev->csi);
+	if (ret)
+		return ret;
+
+	platform_set_drvdata(pdev, sdev);
+
+	return 0;
+}
+
+static int sun6i_csi_remove(struct platform_device *pdev)
+{
+	struct sun6i_csi_dev *sdev = platform_get_drvdata(pdev);
+
+	sun6i_csi_cleanup(&sdev->csi);
+
+	return 0;
+}
+
+static const struct of_device_id sun6i_csi_of_match[] = {
+	{ .compatible = "allwinner,sun8i-v3s-csi", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, sun6i_csi_of_match);
+
+static struct platform_driver sun6i_csi_platform_driver = {
+	.probe = sun6i_csi_probe,
+	.remove = sun6i_csi_remove,
+	.driver = {
+		.name = MODULE_NAME,
+		.of_match_table = of_match_ptr(sun6i_csi_of_match),
+	},
+};
+module_platform_driver(sun6i_csi_platform_driver);
+
+MODULE_DESCRIPTION("Allwinner V3s Camera Sensor Interface driver");
+MODULE_AUTHOR("Yong Deng <[e-mail]>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/media/platform/sun6i-csi/sun6i_csi_v3s.h b/drivers/media/platform/sun6i-csi/sun6i_csi_v3s.h
new file mode 100644
index 0000000..6c87b74
--- /dev/null
+++ b/drivers/media/platform/sun6i-csi/sun6i_csi_v3s.h
@@ -0,0 +1,206 @@ 
+/*
+ * Copyright (c) 2017 Yong Deng <[e-mail]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __SUN6I_CSI_V3S_H__
+#define __SUN6I_CSI_V3S_H__
+
+#include <linux/kernel.h>
+
+#define CSI_EN_REG			0x0
+#define CSI_EN_VER_EN				BIT(30)
+#define CSI_EN_CSI_EN				BIT(0)
+
+#define CSI_IF_CFG_REG			0x4
+#define CSI_IF_CFG_SRC_TYPE_MASK		BIT(21)
+#define CSI_IF_CFG_SRC_TYPE_PROGRESSED		((0 << 21) & CSI_IF_CFG_SRC_TYPE_MASK)
+#define CSI_IF_CFG_SRC_TYPE_INTERLACED		((1 << 21) & CSI_IF_CFG_SRC_TYPE_MASK)
+#define CSI_IF_CFG_FPS_DS_EN			BIT(20)
+#define CSI_IF_CFG_FIELD_MASK			BIT(19)
+#define CSI_IF_CFG_FIELD_NEGATIVE		((0 << 19) & CSI_IF_CFG_FIELD_MASK)
+#define CSI_IF_CFG_FIELD_POSITIVE		((1 << 19) & CSI_IF_CFG_FIELD_MASK)
+#define CSI_IF_CFG_VREF_POL_MASK		BIT(18)
+#define CSI_IF_CFG_VREF_POL_NEGATIVE		((0 << 18) & CSI_IF_CFG_VREF_POL_MASK)
+#define CSI_IF_CFG_VREF_POL_POSITIVE		((1 << 18) & CSI_IF_CFG_VREF_POL_MASK)
+#define CSI_IF_CFG_HREF_POL_MASK		BIT(17)
+#define CSI_IF_CFG_HREF_POL_NEGATIVE		((0 << 17) & CSI_IF_CFG_HREF_POL_MASK)
+#define CSI_IF_CFG_HREF_POL_POSITIVE		((1 << 17) & CSI_IF_CFG_HREF_POL_MASK)
+#define CSI_IF_CFG_CLK_POL_MASK			BIT(16)
+#define CSI_IF_CFG_CLK_POL_RISING_EDGE		((0 << 16) & CSI_IF_CFG_CLK_POL_MASK)
+#define CSI_IF_CFG_CLK_POL_FALLING_EDGE		((1 << 16) & CSI_IF_CFG_CLK_POL_MASK)
+#define CSI_IF_CFG_IF_DATA_WIDTH_MASK		GENMASK(10, 8)
+#define CSI_IF_CFG_IF_DATA_WIDTH_8BIT		((0 << 8) & CSI_IF_CFG_IF_DATA_WIDTH_MASK)
+#define CSI_IF_CFG_IF_DATA_WIDTH_10BIT		((1 << 8) & CSI_IF_CFG_IF_DATA_WIDTH_MASK)
+#define CSI_IF_CFG_IF_DATA_WIDTH_12BIT		((2 << 8) & CSI_IF_CFG_IF_DATA_WIDTH_MASK)
+#define CSI_IF_CFG_MIPI_IF_MASK			BIT(7)
+#define CSI_IF_CFG_MIPI_IF_CSI			(0 << 7)
+#define CSI_IF_CFG_MIPI_IF_MIPI			(1 << 7)
+#define CSI_IF_CFG_CSI_IF_MASK			GENMASK(4, 0)
+#define CSI_IF_CFG_CSI_IF_YUV422_INTLV		((0 << 0) & CSI_IF_CFG_CSI_IF_MASK)
+#define CSI_IF_CFG_CSI_IF_YUV422_16BIT		((1 << 0) & CSI_IF_CFG_CSI_IF_MASK)
+#define CSI_IF_CFG_CSI_IF_BT656			((4 << 0) & CSI_IF_CFG_CSI_IF_MASK)
+#define CSI_IF_CFG_CSI_IF_BT1120		((5 << 0) & CSI_IF_CFG_CSI_IF_MASK)
+
+#define CSI_CAP_REG			0x8
+#define CSI_CAP_CH0_CAP_MASK_MASK		GENMASK(5, 2)
+#define CSI_CAP_CH0_CAP_MASK(count)		((count << 2) & CSI_CAP_CH0_CAP_MASK_MASK)
+#define CSI_CAP_CH0_VCAP_ON			BIT(1)
+#define CSI_CAP_CH0_SCAP_ON			BIT(0)
+
+#define CSI_SYNC_CNT_REG		0xc
+#define CSI_FIFO_THRS_REG		0x10
+#define CSI_BT656_HEAD_CFG_REG		0x14
+#define CSI_PTN_LEN_REG			0x30
+#define CSI_PTN_ADDR_REG		0x34
+#define CSI_VER_REG			0x3c
+
+#define CSI_CH_CFG_REG			0x44
+#define CSI_CH_CFG_INPUT_FMT_MASK		GENMASK(23, 20)
+#define CSI_CH_CFG_INPUT_FMT(fmt)		((fmt << 20) & CSI_CH_CFG_INPUT_FMT_MASK)
+#define CSI_CH_CFG_OUTPUT_FMT_MASK		GENMASK(19, 16)
+#define CSI_CH_CFG_OUTPUT_FMT(fmt)		((fmt << 16) & CSI_CH_CFG_OUTPUT_FMT_MASK)
+#define CSI_CH_CFG_VFLIP_EN			BIT(13)
+#define CSI_CH_CFG_HFLIP_EN			BIT(12)
+#define CSI_CH_CFG_FIELD_SEL_MASK		GENMASK(11, 10)
+#define CSI_CH_CFG_FIELD_SEL_FIELD0		((0 << 10) & CSI_CH_CFG_FIELD_SEL_MASK)
+#define CSI_CH_CFG_FIELD_SEL_FIELD1		((1 << 10) & CSI_CH_CFG_FIELD_SEL_MASK)
+#define CSI_CH_CFG_FIELD_SEL_BOTH		((2 << 10) & CSI_CH_CFG_FIELD_SEL_MASK)
+#define CSI_CH_CFG_INPUT_SEQ_MASK		GENMASK(9, 8)
+#define CSI_CH_CFG_INPUT_SEQ(seq)		((seq << 8) & CSI_CH_CFG_INPUT_SEQ_MASK)
+
+#define CSI_CH_SCALE_REG		0x4c
+#define CSI_CH_SCALE_QUART_EN			BIT(0)
+
+#define CSI_CH_F0_BUFA_REG		0x50
+
+#define CSI_CH_F1_BUFA_REG		0x58
+
+#define CSI_CH_F2_BUFA_REG		0x60
+
+#define CSI_CH_STA_REG			0x6c
+#define CSI_CH_STA_FIELD_STA_MASK		BIT(2)
+#define CSI_CH_STA_FIELD_STA_FIELD0		((0 << 2) & CSI_CH_STA_FIELD_STA_MASK)
+#define CSI_CH_STA_FIELD_STA_FIELD1		((1 << 2) & CSI_CH_STA_FIELD_STA_MASK)
+#define CSI_CH_STA_VCAP_STA			BIT(1)
+#define CSI_CH_STA_SCAP_STA			BIT(0)
+
+#define CSI_CH_INT_EN_REG		0x70
+#define CSI_CH_INT_EN_VS_INT_EN			BIT(7)
+#define CSI_CH_INT_EN_HB_OF_INT_EN		BIT(6)
+#define CSI_CH_INT_EN_MUL_ERR_INT_EN		BIT(5)
+#define CSI_CH_INT_EN_FIFO2_OF_INT_EN		BIT(4)
+#define CSI_CH_INT_EN_FIFO1_OF_INT_EN		BIT(3)
+#define CSI_CH_INT_EN_FIFO0_OF_INT_EN		BIT(2)
+#define CSI_CH_INT_EN_FD_INT_EN			BIT(1)
+#define CSI_CH_INT_EN_CD_INT_EN			BIT(0)
+
+#define CSI_CH_INT_STA_REG		0x74
+#define CSI_CH_INT_STA_VS_PD			BIT(7)
+#define CSI_CH_INT_STA_HB_OF_PD			BIT(6)
+#define CSI_CH_INT_STA_MUL_ERR_PD		BIT(5)
+#define CSI_CH_INT_STA_FIFO2_OF_PD		BIT(4)
+#define CSI_CH_INT_STA_FIFO1_OF_PD		BIT(3)
+#define CSI_CH_INT_STA_FIFO0_OF_PD		BIT(2)
+#define CSI_CH_INT_STA_FD_PD			BIT(1)
+#define CSI_CH_INT_STA_CD_PD			BIT(0)
+
+#define CSI_CH_FLD1_VSIZE_REG		0x74
+
+#define CSI_CH_HSIZE_REG		0x80
+#define CSI_CH_HSIZE_HOR_LEN_MASK		GENMASK(28, 16)
+#define CSI_CH_HSIZE_HOR_LEN(len)		((len << 16) & CSI_CH_HSIZE_HOR_LEN_MASK)
+#define CSI_CH_HSIZE_HOR_START_MASK		GENMASK(12, 0)
+#define CSI_CH_HSIZE_HOR_START(start)		((start << 0) & CSI_CH_HSIZE_HOR_START_MASK)
+
+#define CSI_CH_VSIZE_REG		0x84
+#define CSI_CH_VSIZE_VER_LEN_MASK		GENMASK(28, 16)
+#define CSI_CH_VSIZE_VER_LEN(len)		((len << 16) & CSI_CH_VSIZE_VER_LEN_MASK)
+#define CSI_CH_VSIZE_VER_START_MASK		GENMASK(12, 0)
+#define CSI_CH_VSIZE_VER_START(start)		((start << 0) & CSI_CH_VSIZE_VER_START_MASK)
+
+#define CSI_CH_BUF_LEN_REG		0x88
+#define CSI_CH_BUF_LEN_BUF_LEN_C_MASK		GENMASK(29, 16)
+#define CSI_CH_BUF_LEN_BUF_LEN_C(len)		((len << 16) & CSI_CH_BUF_LEN_BUF_LEN_C_MASK)
+#define CSI_CH_BUF_LEN_BUF_LEN_Y_MASK		GENMASK(13, 0)
+#define CSI_CH_BUF_LEN_BUF_LEN_Y(len)		((len << 0) & CSI_CH_BUF_LEN_BUF_LEN_Y_MASK)
+
+#define CSI_CH_FLIP_SIZE_REG		0x8c
+#define CSI_CH_FLIP_SIZE_VER_LEN_MASK		GENMASK(28, 16)
+#define CSI_CH_FLIP_SIZE_VER_LEN(len)		((len << 16) & CSI_CH_FLIP_SIZE_VER_LEN_MASK)
+#define CSI_CH_FLIP_SIZE_VALID_LEN_MASK		GENMASK(12, 0)
+#define CSI_CH_FLIP_SIZE_VALID_LEN(len)		((len << 0) & CSI_CH_FLIP_SIZE_VALID_LEN_MASK)
+
+#define CSI_CH_FRM_CLK_CNT_REG		0x90
+#define CSI_CH_ACC_ITNL_CLK_CNT_REG	0x94
+#define CSI_CH_FIFO_STAT_REG		0x98
+#define CSI_CH_PCLK_STAT_REG		0x9c
+
+/*
+ * csi input data format
+ */
+enum csi_input_fmt
+{
+	CSI_INPUT_FORMAT_RAW		= 0,
+	CSI_INPUT_FORMAT_YUV422		= 3,
+	CSI_INPUT_FORMAT_YUV420		= 4,
+};
+
+/*
+ * csi output data format
+ */
+enum csi_output_fmt
+{
+	/* only when input format is RAW */
+	CSI_FIELD_RAW_8			= 0,
+	CSI_FIELD_RAW_10		= 1,
+	CSI_FIELD_RAW_12		= 2,
+	CSI_FIELD_RGB565		= 4,
+	CSI_FIELD_RGB888		= 5,
+	CSI_FIELD_PRGB888		= 6,
+	CSI_FRAME_RAW_8			= 8,
+	CSI_FRAME_RAW_10		= 9,
+	CSI_FRAME_RAW_12		= 10,
+	CSI_FRAME_RGB565		= 12,
+	CSI_FRAME_RGB888		= 13,
+	CSI_FRAME_PRGB888		= 14,
+
+	/* only when input format is YUV422/YUV420 */
+	CSI_FIELD_PLANAR_YUV422		= 0,
+	CSI_FIELD_PLANAR_YUV420		= 1,
+	CSI_FRAME_PLANAR_YUV420		= 2,
+	CSI_FRAME_PLANAR_YUV422		= 3,
+	CSI_FIELD_UV_CB_YUV422		= 4,
+	CSI_FIELD_UV_CB_YUV420		= 5,
+	CSI_FRAME_UV_CB_YUV420		= 6,
+	CSI_FRAME_UV_CB_YUV422		= 7,
+	CSI_FIELD_MB_YUV422		= 8,
+	CSI_FIELD_MB_YUV420		= 9,
+	CSI_FRAME_MB_YUV420		= 10,
+	CSI_FRAME_MB_YUV422		= 11,
+	CSI_FIELD_UV_CB_YUV422_10	= 12,
+	CSI_FIELD_UV_CB_YUV420_10	= 13,
+};
+
+/*
+ * csi YUV input data sequence
+ */
+enum csi_input_seq
+{
+	/* only when input format is YUV422 */
+	CSI_INPUT_SEQ_YUYV = 0,
+	CSI_INPUT_SEQ_YVYU,
+	CSI_INPUT_SEQ_UYVY,
+	CSI_INPUT_SEQ_VYUY,
+};
+
+#endif /* __SUN6I_CSI_V3S_H__ */
diff --git a/drivers/media/platform/sun6i-csi/sun6i_video.c b/drivers/media/platform/sun6i-csi/sun6i_video.c
new file mode 100644
index 0000000..0c5dbd2
--- /dev/null
+++ b/drivers/media/platform/sun6i-csi/sun6i_video.c
@@ -0,0 +1,663 @@ 
+/*
+ * Copyright (c) 2017 Magewell Electronics Co., Ltd. (Nanjing).
+ * All rights reserved.
+ * Author: Yong Deng <[e-mail]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/of.h>
+
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-mc.h>
+#include <media/videobuf2-dma-contig.h>
+#include <media/videobuf2-v4l2.h>
+
+#include "sun6i_csi.h"
+#include "sun6i_video.h"
+
+struct sun6i_csi_buffer {
+	struct vb2_v4l2_buffer		vb;
+	struct list_head		list;
+
+	dma_addr_t			dma_addr;
+};
+
+static struct sun6i_csi_format *
+find_format_by_fourcc(struct sun6i_video *video, unsigned int fourcc)
+{
+	unsigned int num_formats = video->num_formats;
+	struct sun6i_csi_format *fmt;
+	unsigned int i;
+
+	for (i = 0; i < num_formats; i++) {
+		fmt = &video->formats[i];
+		if (fmt->fourcc == fourcc)
+			return fmt;
+	}
+
+	return NULL;
+}
+
+static struct v4l2_subdev *
+sun6i_video_remote_subdev(struct sun6i_video *video, u32 *pad)
+{
+	struct media_pad *remote;
+
+	remote = media_entity_remote_pad(&video->pad);
+
+	if (!remote || !is_media_entity_v4l2_subdev(remote->entity))
+		return NULL;
+
+	if (pad)
+		*pad = remote->index;
+
+	return media_entity_to_v4l2_subdev(remote->entity);
+}
+
+static int sun6i_video_queue_setup(struct vb2_queue *vq,
+				 unsigned int *nbuffers, unsigned int *nplanes,
+				 unsigned int sizes[],
+				 struct device *alloc_devs[])
+{
+	struct sun6i_video *video = vb2_get_drv_priv(vq);
+	unsigned int size = video->fmt.fmt.pix.sizeimage;
+
+	if (*nplanes)
+		return sizes[0] < size ? -EINVAL : 0;
+
+	*nplanes = 1;
+	sizes[0] = size;
+
+	return 0;
+}
+
+static int sun6i_video_buffer_prepare(struct vb2_buffer *vb)
+{
+	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+	struct sun6i_csi_buffer *buf =
+			container_of(vbuf, struct sun6i_csi_buffer, vb);
+	struct sun6i_video *video = vb2_get_drv_priv(vb->vb2_queue);
+	unsigned long size = video->fmt.fmt.pix.sizeimage;
+
+	if (vb2_plane_size(vb, 0) < size) {
+		v4l2_err(video->vdev.v4l2_dev, "buffer too small (%lu < %lu)\n",
+			 vb2_plane_size(vb, 0), size);
+		return -EINVAL;
+	}
+
+	vb2_set_plane_payload(vb, 0, size);
+
+	buf->dma_addr = vb2_dma_contig_plane_dma_addr(vb, 0);
+
+	vbuf->field = video->fmt.fmt.pix.field;
+
+	return 0;
+}
+
+static int sun6i_pipeline_set_stream(struct sun6i_video *video, bool enable)
+{
+	struct media_entity *entity;
+	struct media_pad *pad;
+	struct v4l2_subdev *subdev;
+	int ret;
+
+	entity = &video->vdev.entity;
+	while (1) {
+		pad = &entity->pads[0];
+		if (!(pad->flags & MEDIA_PAD_FL_SINK))
+			break;
+
+		pad = media_entity_remote_pad(pad);
+		if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
+			break;
+
+		entity = pad->entity;
+		subdev = media_entity_to_v4l2_subdev(entity);
+
+		ret = v4l2_subdev_call(subdev, video, s_stream, enable);
+		if (enable && ret < 0 && ret != -ENOIOCTLCMD)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int sun6i_video_start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+	struct sun6i_video *video = vb2_get_drv_priv(vq);
+	struct sun6i_csi_buffer *buf;
+	struct sun6i_csi_config config;
+	unsigned long flags;
+	int ret;
+
+	video->sequence = 0;
+
+	ret = media_pipeline_start(&video->vdev.entity, &video->vdev.pipe);
+	if (ret < 0)
+		goto err_start_pipeline;
+
+	ret = sun6i_pipeline_set_stream(video, true);
+	if (ret < 0)
+		goto err_start_stream;
+
+	config.pixelformat = video->fmt.fmt.pix.pixelformat;
+	config.code = video->current_fmt->mbus_code;
+	config.field = video->fmt.fmt.pix.field;
+	config.width = video->fmt.fmt.pix.width;
+	config.height = video->fmt.fmt.pix.height;
+
+	ret = sun6i_csi_update_config(video->csi, &config);
+	if (ret < 0)
+		goto err_update_config;
+
+	spin_lock_irqsave(&video->dma_queue_lock, flags);
+	video->cur_frm = list_first_entry(&video->dma_queue,
+					  struct sun6i_csi_buffer, list);
+	list_del(&video->cur_frm->list);
+	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
+
+	ret = sun6i_csi_update_buf_addr(video->csi, video->cur_frm->dma_addr);
+	if (ret < 0)
+		goto err_update_addr;
+
+	ret = sun6i_csi_set_stream(video->csi, true);
+	if (ret < 0)
+		goto err_csi_stream;
+
+	return 0;
+
+err_csi_stream:
+err_update_addr:
+err_update_config:
+	sun6i_pipeline_set_stream(video, false);
+err_start_stream:
+	media_pipeline_stop(&video->vdev.entity);
+err_start_pipeline:
+	spin_lock_irqsave(&video->dma_queue_lock, flags);
+	list_for_each_entry(buf, &video->dma_queue, list)
+		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
+	INIT_LIST_HEAD(&video->dma_queue);
+	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
+
+	return ret;
+}
+
+static void sun6i_video_stop_streaming(struct vb2_queue *vq)
+{
+	struct sun6i_video *video = vb2_get_drv_priv(vq);
+	unsigned long flags;
+	struct sun6i_csi_buffer *buf;
+
+	sun6i_pipeline_set_stream(video, false);
+
+	sun6i_csi_set_stream(video->csi, false);
+
+	media_pipeline_stop(&video->vdev.entity);
+
+	/* Release all active buffers */
+	spin_lock_irqsave(&video->dma_queue_lock, flags);
+	if (unlikely(video->cur_frm)) {
+		vb2_buffer_done(&video->cur_frm->vb.vb2_buf,
+				VB2_BUF_STATE_ERROR);
+		video->cur_frm = NULL;
+	}
+	list_for_each_entry(buf, &video->dma_queue, list)
+		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+	INIT_LIST_HEAD(&video->dma_queue);
+	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
+}
+
+static void sun6i_video_buffer_queue(struct vb2_buffer *vb)
+{
+	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+	struct sun6i_csi_buffer *buf =
+			container_of(vbuf, struct sun6i_csi_buffer, vb);
+	struct sun6i_video *video = vb2_get_drv_priv(vb->vb2_queue);
+	unsigned long flags;
+
+	spin_lock_irqsave(&video->dma_queue_lock, flags);
+	if (!video->cur_frm && list_empty(&video->dma_queue) &&
+		vb2_is_streaming(vb->vb2_queue)) {
+		video->cur_frm = buf;
+		sun6i_csi_update_buf_addr(video->csi, video->cur_frm->dma_addr);
+		sun6i_csi_set_stream(video->csi, 1);
+	} else
+		list_add_tail(&buf->list, &video->dma_queue);
+	spin_unlock_irqrestore(&video->dma_queue_lock, flags);
+}
+
+void sun6i_video_frame_done(struct sun6i_video *video)
+{
+	spin_lock(&video->dma_queue_lock);
+
+	if (video->cur_frm) {
+		struct vb2_v4l2_buffer *vbuf = &video->cur_frm->vb;
+		struct vb2_buffer *vb = &vbuf->vb2_buf;
+
+		vb->timestamp = ktime_get_ns();
+		vbuf->sequence = video->sequence++;
+		vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
+		video->cur_frm = NULL;
+	}
+
+	if (!list_empty(&video->dma_queue)
+	    && vb2_is_streaming(&video->vb2_vidq)) {
+		video->cur_frm = list_first_entry(&video->dma_queue,
+				struct sun6i_csi_buffer, list);
+		list_del(&video->cur_frm->list);
+		sun6i_csi_update_buf_addr(video->csi, video->cur_frm->dma_addr);
+	} else
+		sun6i_csi_set_stream(video->csi, 0);
+
+	spin_unlock(&video->dma_queue_lock);
+}
+
+static struct vb2_ops sun6i_csi_vb2_ops = {
+	.queue_setup		= sun6i_video_queue_setup,
+	.wait_prepare		= vb2_ops_wait_prepare,
+	.wait_finish		= vb2_ops_wait_finish,
+	.buf_prepare		= sun6i_video_buffer_prepare,
+	.start_streaming	= sun6i_video_start_streaming,
+	.stop_streaming		= sun6i_video_stop_streaming,
+	.buf_queue		= sun6i_video_buffer_queue,
+};
+
+static int vidioc_querycap(struct file *file, void *priv,
+				struct v4l2_capability *cap)
+{
+	struct sun6i_video *video = video_drvdata(file);
+
+	strlcpy(cap->driver, "sun6i-video", sizeof(cap->driver));
+	strlcpy(cap->card, video->vdev.name, sizeof(cap->card));
+	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
+		 video->csi->dev->of_node->name);
+
+	return 0;
+}
+
+static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
+				   struct v4l2_fmtdesc *f)
+{
+	struct sun6i_video *video = video_drvdata(file);
+	u32 index = f->index;
+
+	if (index >= video->num_formats)
+		return -EINVAL;
+
+	f->pixelformat = video->formats[index].fourcc;
+
+	return 0;
+}
+
+static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
+				struct v4l2_format *fmt)
+{
+	struct sun6i_video *video = video_drvdata(file);
+
+	*fmt = video->fmt;
+
+	return 0;
+}
+
+static int sun6i_video_try_fmt(struct sun6i_video *video, struct v4l2_format *f,
+			       struct sun6i_csi_format **current_fmt)
+{
+	struct sun6i_csi_format *csi_fmt;
+	struct v4l2_pix_format *pixfmt = &f->fmt.pix;
+	struct v4l2_subdev_format format;
+	struct v4l2_subdev *subdev;
+	u32 pad;
+	int ret;
+
+	subdev = sun6i_video_remote_subdev(video, &pad);
+	if (subdev == NULL)
+		return -ENXIO;
+
+	csi_fmt = find_format_by_fourcc(video, pixfmt->pixelformat);
+	if (csi_fmt == NULL)
+		return -EINVAL;
+
+	format.pad = pad;
+	format.which = V4L2_SUBDEV_FORMAT_TRY;
+	v4l2_fill_mbus_format(&format.format, pixfmt, csi_fmt->mbus_code);
+	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &format);
+	if (ret)
+		return ret;
+
+	v4l2_fill_pix_format(pixfmt, &format.format);
+
+	pixfmt->bytesperline = (pixfmt->width * csi_fmt->bpp) >> 3;
+	pixfmt->sizeimage = (pixfmt->width * csi_fmt->bpp * pixfmt->height) / 8;
+
+	if (current_fmt)
+		*current_fmt = csi_fmt;
+
+	return 0;
+}
+
+static int sun6i_video_set_fmt(struct sun6i_video *video, struct v4l2_format *f)
+{
+	struct v4l2_subdev_format format;
+	struct sun6i_csi_format *current_fmt;
+	struct v4l2_subdev *subdev;
+	u32 pad;
+	int ret;
+
+	subdev = sun6i_video_remote_subdev(video, &pad);
+	if (subdev == NULL)
+		return -ENXIO;
+
+	ret = sun6i_video_try_fmt(video, f, &current_fmt);
+	if (ret)
+		return ret;
+
+	format.which = V4L2_SUBDEV_FORMAT_ACTIVE;
+	v4l2_fill_mbus_format(&format.format, &f->fmt.pix,
+			      current_fmt->mbus_code);
+	ret = v4l2_subdev_call(subdev, pad, set_fmt, NULL, &format);
+	if (ret < 0)
+		return ret;
+
+	video->fmt = *f;
+	video->current_fmt = current_fmt;
+
+	return 0;
+}
+
+static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
+				struct v4l2_format *f)
+{
+	struct sun6i_video *video = video_drvdata(file);
+
+	if (vb2_is_streaming(&video->vb2_vidq))
+		return -EBUSY;
+
+	return sun6i_video_set_fmt(video, f);
+}
+
+static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
+				  struct v4l2_format *f)
+{
+	struct sun6i_video *video = video_drvdata(file);
+
+	return sun6i_video_try_fmt(video, f, NULL);
+}
+
+static const struct v4l2_ioctl_ops sun6i_video_ioctl_ops = {
+	.vidioc_querycap		= vidioc_querycap,
+	.vidioc_enum_fmt_vid_cap	= vidioc_enum_fmt_vid_cap,
+	.vidioc_g_fmt_vid_cap		= vidioc_g_fmt_vid_cap,
+	.vidioc_s_fmt_vid_cap		= vidioc_s_fmt_vid_cap,
+	.vidioc_try_fmt_vid_cap		= vidioc_try_fmt_vid_cap,
+
+	.vidioc_reqbufs			= vb2_ioctl_reqbufs,
+	.vidioc_querybuf		= vb2_ioctl_querybuf,
+	.vidioc_qbuf			= vb2_ioctl_qbuf,
+	.vidioc_expbuf			= vb2_ioctl_expbuf,
+	.vidioc_dqbuf			= vb2_ioctl_dqbuf,
+	.vidioc_create_bufs		= vb2_ioctl_create_bufs,
+	.vidioc_prepare_buf		= vb2_ioctl_prepare_buf,
+	.vidioc_streamon		= vb2_ioctl_streamon,
+	.vidioc_streamoff		= vb2_ioctl_streamoff,
+};
+
+/* -----------------------------------------------------------------------------
+ * V4L2 file operations
+ */
+static int sun6i_video_open(struct file *file)
+{
+	struct sun6i_video *video = video_drvdata(file);
+	struct v4l2_format format;
+	int ret;
+
+	if (mutex_lock_interruptible(&video->lock))
+		return -ERESTARTSYS;
+
+	ret = v4l2_fh_open(file);
+	if (ret < 0)
+		goto unlock;
+
+	ret = v4l2_pipeline_pm_use(&video->vdev.entity, 1);
+	if (ret < 0)
+		goto fh_release;
+
+	if (!v4l2_fh_is_singular_file(file))
+		goto unlock;
+
+	ret = sun6i_csi_set_power(video->csi, true);
+	if (ret < 0)
+		goto fh_release;
+
+	/* setup default format */
+	if (video->num_formats > 0) {
+		format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+		format.fmt.pix.width = 1280;
+		format.fmt.pix.height = 720;
+		format.fmt.pix.pixelformat = video->formats[0].fourcc;
+		sun6i_video_set_fmt(video, &format);
+	}
+
+	mutex_unlock(&video->lock);
+	return 0;
+
+fh_release:
+	v4l2_fh_release(file);
+unlock:
+	mutex_unlock(&video->lock);
+	return ret;
+}
+
+static int sun6i_video_close(struct file *file)
+{
+	struct sun6i_video *video = video_drvdata(file);
+	bool last_fh;
+
+	mutex_lock(&video->lock);
+
+	last_fh = v4l2_fh_is_singular_file(file);
+
+	_vb2_fop_release(file, NULL);
+
+	v4l2_pipeline_pm_use(&video->vdev.entity, 0);
+
+	if (last_fh)
+		sun6i_csi_set_power(video->csi, false);
+
+	mutex_unlock(&video->lock);
+
+	return 0;
+}
+
+static const struct v4l2_file_operations sun6i_video_fops = {
+	.owner		= THIS_MODULE,
+	.open		= sun6i_video_open,
+	.release	= sun6i_video_close,
+	.unlocked_ioctl	= video_ioctl2,
+	.mmap		= vb2_fop_mmap,
+	.poll		= vb2_fop_poll
+};
+
+/* -----------------------------------------------------------------------------
+ * Media Operations
+ */
+static int sun6i_video_formats_init(struct sun6i_video *video)
+{
+	struct v4l2_subdev_mbus_code_enum mbus_code = { 0 };
+	struct sun6i_csi *csi = video->csi;
+	struct v4l2_subdev *subdev;
+	u32 pad;
+	const u32 *pixformats;
+	int pixformat_count = 0;
+	u32 subdev_codes[32]; /* subdev format codes, 32 should be enough */
+	int codes_count = 0;
+	int num_fmts = 0;
+	int i, j;
+
+	subdev = sun6i_video_remote_subdev(video, &pad);
+	if (subdev == NULL)
+		return -ENXIO;
+
+	/* Get supported pixformats of CSI */
+	pixformat_count = sun6i_csi_get_supported_pixformats(csi, &pixformats);
+	if (pixformat_count <= 0)
+		return -ENXIO;
+
+	/* Get subdev formats codes */
+	mbus_code.pad = pad;
+	mbus_code.which = V4L2_SUBDEV_FORMAT_ACTIVE;
+	while (!v4l2_subdev_call(subdev, pad, enum_mbus_code, NULL,
+			&mbus_code)) {
+		subdev_codes[codes_count] = mbus_code.code;
+		codes_count++;
+		mbus_code.index++;
+	}
+
+	if (!codes_count)
+		return -ENXIO;
+
+	/* Get supported formats count */
+	for (i = 0; i < codes_count; i++) {
+		for (j = 0; j < pixformat_count; j++) {
+			if (!sun6i_csi_is_format_support(csi, pixformats[j],
+					mbus_code.code)) {
+				continue;
+			}
+			num_fmts++;
+		}
+	}
+
+	if (!num_fmts)
+		return -ENXIO;
+
+	video->num_formats = num_fmts;
+	video->formats = devm_kcalloc(video->csi->dev, num_fmts,
+			sizeof(struct sun6i_csi_format), GFP_KERNEL);
+	if (!video->formats) {
+		dev_err(video->csi->dev, "could not allocate memory\n");
+		return -ENOMEM;
+	}
+
+	/* Get supported formats */
+	num_fmts = 0;
+	for (i = 0; i < codes_count; i++) {
+		for (j = 0; j < pixformat_count; j++) {
+			if (!sun6i_csi_is_format_support(csi, pixformats[j],
+					mbus_code.code)) {
+				continue;
+			}
+
+			video->formats[num_fmts].fourcc = pixformats[j];
+			video->formats[num_fmts].mbus_code =
+					mbus_code.code;
+			video->formats[num_fmts].bpp =
+					v4l2_pixformat_get_bpp(pixformats[j]);
+			num_fmts++;
+		}
+	}
+
+	return 0;
+}
+
+static int sun6i_video_link_setup(struct media_entity *entity,
+				  const struct media_pad *local,
+				  const struct media_pad *remote, u32 flags)
+{
+	struct video_device *vdev = media_entity_to_video_device(entity);
+	struct sun6i_video *video = video_get_drvdata(vdev);
+
+	if (WARN_ON(video == NULL))
+		return 0;
+
+	return sun6i_video_formats_init(video);
+}
+
+static const struct media_entity_operations sun6i_video_media_ops = {
+	.link_setup = sun6i_video_link_setup,
+};
+
+int sun6i_video_init(struct sun6i_video *video, struct sun6i_csi *csi,
+		     const char *name)
+{
+	struct video_device *vdev = &video->vdev;
+	struct vb2_queue *vidq = &video->vb2_vidq;
+	int ret;
+
+	video->csi = csi;
+
+	/* Initialize the media entity... */
+	video->pad.flags = MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
+	vdev->entity.ops = &sun6i_video_media_ops;
+	ret = media_entity_pads_init(&vdev->entity, 1, &video->pad);
+	if (ret < 0)
+		return ret;
+
+	mutex_init(&video->lock);
+
+	INIT_LIST_HEAD(&video->dma_queue);
+	spin_lock_init(&video->dma_queue_lock);
+
+	video->cur_frm = NULL;
+	video->sequence = 0;
+	video->num_formats = 0;
+
+	/* Initialize videobuf2 queue */
+	vidq->type			= V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	vidq->io_modes			= VB2_MMAP | VB2_DMABUF;
+	vidq->drv_priv			= video;
+	vidq->buf_struct_size		= sizeof(struct sun6i_csi_buffer);
+	vidq->ops			= &sun6i_csi_vb2_ops;
+	vidq->mem_ops			= &vb2_dma_contig_memops;
+	vidq->timestamp_flags		= V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+	vidq->lock			= &video->lock;
+	vidq->min_buffers_needed	= 1;
+	vidq->dev			= csi->dev;
+
+	ret = vb2_queue_init(vidq);
+	if (ret) {
+		v4l2_err(&csi->v4l2_dev, "vb2_queue_init failed: %d\n", ret);
+		goto error;
+	}
+
+	/* Register video device */
+	strlcpy(vdev->name, name, sizeof(vdev->name));
+	vdev->release		= video_device_release_empty;
+	vdev->fops		= &sun6i_video_fops;
+	vdev->ioctl_ops		= &sun6i_video_ioctl_ops;
+	vdev->vfl_type		= VFL_TYPE_GRABBER;
+	vdev->vfl_dir		= VFL_DIR_RX;
+	vdev->v4l2_dev		= &csi->v4l2_dev;
+	vdev->queue		= vidq;
+	vdev->lock		= &video->lock;
+	vdev->device_caps	= V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_CAPTURE;
+	video_set_drvdata(vdev, video);
+
+	ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
+	if (ret < 0) {
+		v4l2_err(&csi->v4l2_dev,
+			 "video_register_device failed: %d\n", ret);
+		goto error;
+	}
+
+	return 0;
+
+error:
+	sun6i_video_cleanup(video);
+	return ret;
+}
+
+void sun6i_video_cleanup(struct sun6i_video *video)
+{
+	if (video_is_registered(&video->vdev))
+		video_unregister_device(&video->vdev);
+
+	media_entity_cleanup(&video->vdev.entity);
+}
diff --git a/drivers/media/platform/sun6i-csi/sun6i_video.h b/drivers/media/platform/sun6i-csi/sun6i_video.h
new file mode 100644
index 0000000..14eac6e
--- /dev/null
+++ b/drivers/media/platform/sun6i-csi/sun6i_video.h
@@ -0,0 +1,61 @@ 
+/*
+ * Copyright (c) 2017 Yong Deng <[e-mail]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __SUN6I_VIDEO_H__
+#define __SUN6I_VIDEO_H__
+
+#include <media/v4l2-dev.h>
+#include <media/videobuf2-core.h>
+
+/*
+ * struct sun6i_csi_format - CSI media bus format information
+ * @fourcc: Fourcc code for this format
+ * @mbus_code: V4L2 media bus format code.
+ * @bpp: Bytes per pixel (when stored in memory)
+ */
+struct sun6i_csi_format {
+	u32				fourcc;
+	u32				mbus_code;
+	u8				bpp;
+};
+
+struct sun6i_csi;
+
+struct sun6i_video {
+	struct video_device		vdev;
+	struct media_pad		pad;
+	struct sun6i_csi		*csi;
+
+	struct mutex			lock;
+
+	struct vb2_queue		vb2_vidq;
+	spinlock_t			dma_queue_lock;
+	struct list_head		dma_queue;
+
+	struct sun6i_csi_buffer		*cur_frm;
+	unsigned int			sequence;
+
+	struct sun6i_csi_format		*formats;
+	unsigned int			num_formats;
+	struct sun6i_csi_format		*current_fmt;
+	struct v4l2_format		fmt;
+};
+
+int sun6i_video_init(struct sun6i_video *video, struct sun6i_csi *csi,
+		     const char *name);
+void sun6i_video_cleanup(struct sun6i_video *video);
+
+void sun6i_video_frame_done(struct sun6i_video *video);
+
+#endif /* __SUN6I_VIDEO_H__ */