diff mbox series

[v4,4/5] media: staging: rkisp1: cap: use v4l2_pipeline_stream_{enable,disable} helpers

Message ID 20200522075522.6190-5-dafna.hirschfeld@collabora.com (mailing list archive)
State New, archived
Headers show
Series media: add v4l2_pipeline_stream_{enable,disable} | expand

Commit Message

Dafna Hirschfeld May 22, 2020, 7:55 a.m. UTC 
From: Helen Koike <helen.koike@collabora.com>

Use v4l2_pipeline_stream_{enable,disable} to call .s_stream()
subdevice callbacks through the pipeline.
Those helpers are called only if the other capture is not streaming.

If the other capture is streaming then he already did that for us
so we call s_stream only on the resizer that is connected to the
capture node.

Signed-off-by: Helen Koike <helen.koike@collabora.com>
Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
---
 drivers/staging/media/rkisp1/rkisp1-capture.c | 104 ++++++------------
 1 file changed, 32 insertions(+), 72 deletions(-)

Comments

Tomasz Figa June 10, 2020, 5:03 p.m. UTC | #1 
Hi Dafna,

On Fri, May 22, 2020 at 09:55:21AM +0200, Dafna Hirschfeld wrote:
> From: Helen Koike <helen.koike@collabora.com>
> 
> Use v4l2_pipeline_stream_{enable,disable} to call .s_stream()
> subdevice callbacks through the pipeline.
> Those helpers are called only if the other capture is not streaming.
> 
> If the other capture is streaming then he already did that for us
> so we call s_stream only on the resizer that is connected to the
> capture node.
> 
> Signed-off-by: Helen Koike <helen.koike@collabora.com>
> Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
> ---
>  drivers/staging/media/rkisp1/rkisp1-capture.c | 104 ++++++------------
>  1 file changed, 32 insertions(+), 72 deletions(-)
> 

Thank you for the patch. Please see my comments inline.

[snip]
> +static int rkisp1_s_stream_subdev(struct rkisp1_capture *cap, int enable)
> +{
> +	struct rkisp1_device *rkisp1 = cap->rkisp1;
> +	struct rkisp1_capture *other = &rkisp1->capture_devs[cap->id ^ 1];
> +	int ret;
> +
> +	/*
> +	 * if the other capture is already streaming then we only need to
> +	 * call s_stream of our reszier
> +	 */
> +	if (other->is_streaming) {
> +		struct v4l2_subdev *rsz_sd  = &rkisp1->resizer_devs[cap->id].sd;
> +
> +		ret = v4l2_subdev_call(rsz_sd, video, s_stream, enable);
> +		if (ret && ret != -ENOIOCTLCMD)
> +			dev_err(rkisp1->dev,
> +				"stream %s resizer '%s' failed (%d)\n",
> +				enable ? "on" : "off", rsz_sd->name, ret);

Do we need this special case? Wouldn't v4l2_pipeline_stream_*() simply
increment reference counters for the other entities?

> +	} else {
> +		if (enable)
> +			ret = v4l2_pipeline_stream_enable(&cap->vnode.vdev);
> +		else
> +			ret = v4l2_pipeline_stream_disable(&cap->vnode.vdev);

I wonder if this doesn't ask for just making the helper
v4l2_pipeline_s_stream(..., int enable).

Best regards,
Tomasz
Dafna Hirschfeld June 10, 2020, 5:22 p.m. UTC | #2 
On 10.06.20 19:03, Tomasz Figa wrote:
> Hi Dafna,
> 
> On Fri, May 22, 2020 at 09:55:21AM +0200, Dafna Hirschfeld wrote:
>> From: Helen Koike <helen.koike@collabora.com>
>>
>> Use v4l2_pipeline_stream_{enable,disable} to call .s_stream()
>> subdevice callbacks through the pipeline.
>> Those helpers are called only if the other capture is not streaming.
>>
>> If the other capture is streaming then he already did that for us
>> so we call s_stream only on the resizer that is connected to the
>> capture node.
>>
>> Signed-off-by: Helen Koike <helen.koike@collabora.com>
>> Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
>> ---
>>   drivers/staging/media/rkisp1/rkisp1-capture.c | 104 ++++++------------
>>   1 file changed, 32 insertions(+), 72 deletions(-)
>>
> 
> Thank you for the patch. Please see my comments inline.
> 
> [snip]
>> +static int rkisp1_s_stream_subdev(struct rkisp1_capture *cap, int enable)
>> +{
>> +	struct rkisp1_device *rkisp1 = cap->rkisp1;
>> +	struct rkisp1_capture *other = &rkisp1->capture_devs[cap->id ^ 1];
>> +	int ret;
>> +
>> +	/*
>> +	 * if the other capture is already streaming then we only need to
>> +	 * call s_stream of our reszier
>> +	 */
>> +	if (other->is_streaming) {
>> +		struct v4l2_subdev *rsz_sd  = &rkisp1->resizer_devs[cap->id].sd;
>> +
>> +		ret = v4l2_subdev_call(rsz_sd, video, s_stream, enable);
>> +		if (ret && ret != -ENOIOCTLCMD)
>> +			dev_err(rkisp1->dev,
>> +				"stream %s resizer '%s' failed (%d)\n",
>> +				enable ? "on" : "off", rsz_sd->name, ret);
> 
> Do we need this special case? Wouldn't v4l2_pipeline_stream_*() simply
> increment reference counters for the other entities?

I removed the stream count in v4 of the patchset since I thought it
might be problematic/confusing to add a field "stream_count" in
"struct v4l2_subdev" that is used and updated only by those helper functions

What do you think?

There is also the issue that both you and Sakari Ailus mentioned that
an isp driver can't know the subtopology of a sensor driver and how it handle the
s_stream callback on it's entities.

Thanks,
Dafna


> 
>> +	} else {
>> +		if (enable)
>> +			ret = v4l2_pipeline_stream_enable(&cap->vnode.vdev);
>> +		else
>> +			ret = v4l2_pipeline_stream_disable(&cap->vnode.vdev);
> 
> I wonder if this doesn't ask for just making the helper
> v4l2_pipeline_s_stream(..., int enable).> 
> Best regards,
> Tomasz
>
Tomasz Figa June 10, 2020, 5:28 p.m. UTC | #3 
On Wed, Jun 10, 2020 at 07:22:04PM +0200, Dafna Hirschfeld wrote:
> 
> 
> On 10.06.20 19:03, Tomasz Figa wrote:
> > Hi Dafna,
> > 
> > On Fri, May 22, 2020 at 09:55:21AM +0200, Dafna Hirschfeld wrote:
> > > From: Helen Koike <helen.koike@collabora.com>
> > > 
> > > Use v4l2_pipeline_stream_{enable,disable} to call .s_stream()
> > > subdevice callbacks through the pipeline.
> > > Those helpers are called only if the other capture is not streaming.
> > > 
> > > If the other capture is streaming then he already did that for us
> > > so we call s_stream only on the resizer that is connected to the
> > > capture node.
> > > 
> > > Signed-off-by: Helen Koike <helen.koike@collabora.com>
> > > Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
> > > ---
> > >   drivers/staging/media/rkisp1/rkisp1-capture.c | 104 ++++++------------
> > >   1 file changed, 32 insertions(+), 72 deletions(-)
> > > 
> > 
> > Thank you for the patch. Please see my comments inline.
> > 
> > [snip]
> > > +static int rkisp1_s_stream_subdev(struct rkisp1_capture *cap, int enable)
> > > +{
> > > +	struct rkisp1_device *rkisp1 = cap->rkisp1;
> > > +	struct rkisp1_capture *other = &rkisp1->capture_devs[cap->id ^ 1];
> > > +	int ret;
> > > +
> > > +	/*
> > > +	 * if the other capture is already streaming then we only need to
> > > +	 * call s_stream of our reszier
> > > +	 */
> > > +	if (other->is_streaming) {
> > > +		struct v4l2_subdev *rsz_sd  = &rkisp1->resizer_devs[cap->id].sd;
> > > +
> > > +		ret = v4l2_subdev_call(rsz_sd, video, s_stream, enable);
> > > +		if (ret && ret != -ENOIOCTLCMD)
> > > +			dev_err(rkisp1->dev,
> > > +				"stream %s resizer '%s' failed (%d)\n",
> > > +				enable ? "on" : "off", rsz_sd->name, ret);
> > 
> > Do we need this special case? Wouldn't v4l2_pipeline_stream_*() simply
> > increment reference counters for the other entities?
> 
> I removed the stream count in v4 of the patchset since I thought it
> might be problematic/confusing to add a field "stream_count" in
> "struct v4l2_subdev" that is used and updated only by those helper functions
> 
> What do you think?
> 
> There is also the issue that both you and Sakari Ailus mentioned that
> an isp driver can't know the subtopology of a sensor driver and how it handle the
> s_stream callback on it's entities.

Ah, okay, so we settled on removing the refcounting from the helpers.
Fair enough. Sorry for the noise.

Feel free to add my Reviewed-by.

Best regards,
Tomasz
diff mbox series

Patch

diff --git a/drivers/staging/media/rkisp1/rkisp1-capture.c b/drivers/staging/media/rkisp1/rkisp1-capture.c
index 008c070373f8..d53a8549da77 100644
--- a/drivers/staging/media/rkisp1/rkisp1-capture.c
+++ b/drivers/staging/media/rkisp1/rkisp1-capture.c
@@ -806,71 +806,6 @@  static void rkisp1_return_all_buffers(struct rkisp1_capture *cap,
 	spin_unlock_irqrestore(&cap->buf.lock, flags);
 }
 
-/*
- * rkisp1_pipeline_sink_walk - Walk through the pipeline and call cb
- * @from: entity at which to start pipeline walk
- * @until: entity at which to stop pipeline walk
- *
- * Walk the entities chain starting at the pipeline video node and stop
- * all subdevices in the chain.
- *
- * If the until argument isn't NULL, stop the pipeline walk when reaching the
- * until entity. This is used to disable a partially started pipeline due to a
- * subdev start error.
- */
-static int rkisp1_pipeline_sink_walk(struct media_entity *from,
-				     struct media_entity *until,
-				     int (*cb)(struct media_entity *from,
-					       struct media_entity *curr))
-{
-	struct media_entity *entity = from;
-	struct media_pad *pad;
-	unsigned int i;
-	int ret;
-
-	while (1) {
-		pad = NULL;
-		/* Find remote source pad */
-		for (i = 0; i < entity->num_pads; i++) {
-			struct media_pad *spad = &entity->pads[i];
-
-			if (!(spad->flags & MEDIA_PAD_FL_SINK))
-				continue;
-			pad = media_entity_remote_pad(spad);
-			if (pad && is_media_entity_v4l2_subdev(pad->entity))
-				break;
-		}
-		if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
-			break;
-
-		entity = pad->entity;
-		if (entity == until)
-			break;
-
-		ret = cb(from, entity);
-		if (ret)
-			return ret;
-	}
-
-	return 0;
-}
-
-static int rkisp1_pipeline_disable_cb(struct media_entity *from,
-				      struct media_entity *curr)
-{
-	struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(curr);
-
-	return v4l2_subdev_call(sd, video, s_stream, false);
-}
-
-static int rkisp1_pipeline_enable_cb(struct media_entity *from,
-				     struct media_entity *curr)
-{
-	struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(curr);
-
-	return v4l2_subdev_call(sd, video, s_stream, true);
-}
-
 static void rkisp1_stream_stop(struct rkisp1_capture *cap)
 {
 	int ret;
@@ -888,6 +823,36 @@  static void rkisp1_stream_stop(struct rkisp1_capture *cap)
 	}
 }
 
+static int rkisp1_s_stream_subdev(struct rkisp1_capture *cap, int enable)
+{
+	struct rkisp1_device *rkisp1 = cap->rkisp1;
+	struct rkisp1_capture *other = &rkisp1->capture_devs[cap->id ^ 1];
+	int ret;
+
+	/*
+	 * if the other capture is already streaming then we only need to
+	 * call s_stream of our reszier
+	 */
+	if (other->is_streaming) {
+		struct v4l2_subdev *rsz_sd  = &rkisp1->resizer_devs[cap->id].sd;
+
+		ret = v4l2_subdev_call(rsz_sd, video, s_stream, enable);
+		if (ret && ret != -ENOIOCTLCMD)
+			dev_err(rkisp1->dev,
+				"stream %s resizer '%s' failed (%d)\n",
+				enable ? "on" : "off", rsz_sd->name, ret);
+	} else {
+		if (enable)
+			ret = v4l2_pipeline_stream_enable(&cap->vnode.vdev);
+		else
+			ret = v4l2_pipeline_stream_disable(&cap->vnode.vdev);
+		if (ret < 0)
+			dev_err(rkisp1->dev, "stream subdevs %s failed %d\n",
+				enable ? "on" : "off", ret);
+	}
+	return ret;
+}
+
 static void rkisp1_vb2_stop_streaming(struct vb2_queue *queue)
 {
 	struct rkisp1_capture *cap = queue->drv_priv;
@@ -898,11 +863,7 @@  static void rkisp1_vb2_stop_streaming(struct vb2_queue *queue)
 	mutex_lock(&cap->rkisp1->stream_lock);
 
 	rkisp1_stream_stop(cap);
-	ret = rkisp1_pipeline_sink_walk(&node->vdev.entity, NULL,
-					rkisp1_pipeline_disable_cb);
-	if (ret)
-		dev_err(rkisp1->dev,
-			"pipeline stream-off failed error:%d\n", ret);
+	rkisp1_s_stream_subdev(cap, 0);
 
 	rkisp1_return_all_buffers(cap, VB2_BUF_STATE_ERROR);
 
@@ -986,8 +947,7 @@  rkisp1_vb2_start_streaming(struct vb2_queue *queue, unsigned int count)
 	rkisp1_stream_start(cap);
 
 	/* start sub-devices */
-	ret = rkisp1_pipeline_sink_walk(entity, NULL,
-					rkisp1_pipeline_enable_cb);
+	ret = rkisp1_s_stream_subdev(cap, 1);
 	if (ret)
 		goto err_stop_stream;