[3/3] DRM: Add KMS driver for the Ingenic JZ47xx SoCs

Commit Message

Paul Cercueil Feb. 28, 2019, 10:07 p.m. UTC

Add a KMS driver for the Ingenic JZ47xx family of SoCs.
This driver is meant to replace the aging jz4740-fb driver.

Signed-off-by: Paul Cercueil <[e-mail]>
Tested-by: Artur Rojek <[e-mail]>
---
 drivers/gpu/drm/Kconfig               |   2 +
 drivers/gpu/drm/Makefile              |   1 +
 drivers/gpu/drm/ingenic/Kconfig       |  16 +
 drivers/gpu/drm/ingenic/Makefile      |   1 +
 drivers/gpu/drm/ingenic/ingenic-drm.c | 896 ++++++++++++++++++++++++++++++++++
 5 files changed, 916 insertions(+)
 create mode 100644 drivers/gpu/drm/ingenic/Kconfig
 create mode 100644 drivers/gpu/drm/ingenic/Makefile
 create mode 100644 drivers/gpu/drm/ingenic/ingenic-drm.c

Comments

Paul Cercueil March 1, 2019, 4:21 p.m. UTC | #1

Hi Daniel,

Le ven. 1 mars 2019 à 5:26, Daniel Vetter <[e-mail]> a écrit :
> On Thu, Feb 28, 2019 at 07:07:56PM -0300, Paul Cercueil wrote:
>>  Add a KMS driver for the Ingenic JZ47xx family of SoCs.
>>  This driver is meant to replace the aging jz4740-fb driver.
>> 
>>  Signed-off-by: Paul Cercueil <[e-mail]>
>>  Tested-by: Artur Rojek <[e-mail]>
> 
> Yay, more fbdev drivers moving to atmic!
> 
> Going on vacations for a week now, so just a few quick high-level 
> comments
> below. Those should make the driver even smaller and cleaner.

Alright, no problem, there's no rush.

>>  ---
>>   drivers/gpu/drm/Kconfig               |   2 +
>>   drivers/gpu/drm/Makefile              |   1 +
>>   drivers/gpu/drm/ingenic/Kconfig       |  16 +
>>   drivers/gpu/drm/ingenic/Makefile      |   1 +
>>   drivers/gpu/drm/ingenic/ingenic-drm.c | 896 
>> ++++++++++++++++++++++++++++++++++
>>   5 files changed, 916 insertions(+)
>>   create mode 100644 drivers/gpu/drm/ingenic/Kconfig
>>   create mode 100644 drivers/gpu/drm/ingenic/Makefile
>>   create mode 100644 drivers/gpu/drm/ingenic/ingenic-drm.c
>> 
>>  diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
>>  index bd943a71756c..f1929112e559 100644
>>  --- a/drivers/gpu/drm/Kconfig
>>  +++ b/drivers/gpu/drm/Kconfig
>>  @@ -303,6 +303,8 @@ source "drivers/gpu/drm/sti/Kconfig"
>> 
>>   source "drivers/gpu/drm/imx/Kconfig"
>> 
>>  +source "drivers/gpu/drm/ingenic/Kconfig"
>>  +
>>   source "drivers/gpu/drm/v3d/Kconfig"
>> 
>>   source "drivers/gpu/drm/vc4/Kconfig"
>>  diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
>>  index 1ac55c65eac0..9666c0767f44 100644
>>  --- a/drivers/gpu/drm/Makefile
>>  +++ b/drivers/gpu/drm/Makefile
>>  @@ -94,6 +94,7 @@ obj-$(CONFIG_DRM_TEGRA) += tegra/
>>   obj-$(CONFIG_DRM_STM) += stm/
>>   obj-$(CONFIG_DRM_STI) += sti/
>>   obj-$(CONFIG_DRM_IMX) += imx/
>>  +obj-y			+= ingenic/
>>   obj-$(CONFIG_DRM_MEDIATEK) += mediatek/
>>   obj-$(CONFIG_DRM_MESON)	+= meson/
>>   obj-y			+= i2c/
>>  diff --git a/drivers/gpu/drm/ingenic/Kconfig 
>> b/drivers/gpu/drm/ingenic/Kconfig
>>  new file mode 100644
>>  index 000000000000..d82c3d37ec9c
>>  --- /dev/null
>>  +++ b/drivers/gpu/drm/ingenic/Kconfig
>>  @@ -0,0 +1,16 @@
>>  +config DRM_INGENIC
>>  +	tristate "DRM Support for Ingenic SoCs"
>>  +	depends on MIPS || COMPILE_TEST
>>  +	depends on DRM
>>  +	depends on CMA
>>  +	depends on OF
>>  +	select DRM_BRIDGE
>>  +	select DRM_PANEL_BRIDGE
>>  +	select DRM_KMS_HELPER
>>  +	select DRM_KMS_CMA_HELPER
>>  +	select DRM_GEM_CMA_HELPER
>>  +	select VT_HW_CONSOLE_BINDING if FRAMEBUFFER_CONSOLE
>>  +	help
>>  +	  Choose this option for DRM support for the Ingenic SoCs.
>>  +
>>  +	  If M is selected the module will be called ingenic-drm.
>>  diff --git a/drivers/gpu/drm/ingenic/Makefile 
>> b/drivers/gpu/drm/ingenic/Makefile
>>  new file mode 100644
>>  index 000000000000..11cac42ce0bb
>>  --- /dev/null
>>  +++ b/drivers/gpu/drm/ingenic/Makefile
>>  @@ -0,0 +1 @@
>>  +obj-$(CONFIG_DRM_INGENIC) += ingenic-drm.o
>>  diff --git a/drivers/gpu/drm/ingenic/ingenic-drm.c 
>> b/drivers/gpu/drm/ingenic/ingenic-drm.c
>>  new file mode 100644
>>  index 000000000000..18120deea96f
>>  --- /dev/null
>>  +++ b/drivers/gpu/drm/ingenic/ingenic-drm.c
>>  @@ -0,0 +1,896 @@
>>  +// SPDX-License-Identifier: GPL-2.0
>>  +//
>>  +// Ingenic JZ47xx KMS driver
>>  +//
>>  +// Copyright (C) 2019, Paul Cercueil <[e-mail]>
>>  +
>>  +#include <linux/clk.h>
>>  +#include <linux/dma-mapping.h>
>>  +#include <linux/module.h>
>>  +#include <linux/platform_device.h>
>>  +#include <linux/regmap.h>
>>  +
>>  +#include <drm/drm_atomic.h>
>>  +#include <drm/drm_atomic_helper.h>
>>  +#include <drm/drm_crtc.h>
>>  +#include <drm/drm_crtc_helper.h>
>>  +#include <drm/drm_drv.h>
>>  +#include <drm/drm_gem_cma_helper.h>
>>  +#include <drm/drm_fb_cma_helper.h>
>>  +#include <drm/drm_fb_helper.h>
>>  +#include <drm/drm_fourcc.h>
>>  +#include <drm/drm_gem_framebuffer_helper.h>
>>  +#include <drm/drm_irq.h>
>>  +#include <drm/drm_panel.h>
>>  +#include <drm/drm_plane.h>
>>  +#include <drm/drm_plane_helper.h>
>>  +#include <drm/drm_probe_helper.h>
>>  +#include <drm/drm_vblank.h>
>>  +
>>  +#include <dt-bindings/display/ingenic,drm.h>
>>  +
>>  +#include "../drm_internal.h"
>>  +
>>  +#define JZ_REG_LCD_CFG		0x00
>>  +#define JZ_REG_LCD_VSYNC	0x04
>>  +#define JZ_REG_LCD_HSYNC	0x08
>>  +#define JZ_REG_LCD_VAT		0x0C
>>  +#define JZ_REG_LCD_DAH		0x10
>>  +#define JZ_REG_LCD_DAV		0x14
>>  +#define JZ_REG_LCD_PS		0x18
>>  +#define JZ_REG_LCD_CLS		0x1C
>>  +#define JZ_REG_LCD_SPL		0x20
>>  +#define JZ_REG_LCD_REV		0x24
>>  +#define JZ_REG_LCD_CTRL		0x30
>>  +#define JZ_REG_LCD_STATE	0x34
>>  +#define JZ_REG_LCD_IID		0x38
>>  +#define JZ_REG_LCD_DA0		0x40
>>  +#define JZ_REG_LCD_SA0		0x44
>>  +#define JZ_REG_LCD_FID0		0x48
>>  +#define JZ_REG_LCD_CMD0		0x4C
>>  +#define JZ_REG_LCD_DA1		0x50
>>  +#define JZ_REG_LCD_SA1		0x54
>>  +#define JZ_REG_LCD_FID1		0x58
>>  +#define JZ_REG_LCD_CMD1		0x5C
>>  +
>>  +#define JZ_LCD_CFG_SLCD			BIT(31)
>>  +#define JZ_LCD_CFG_PS_DISABLE		BIT(23)
>>  +#define JZ_LCD_CFG_CLS_DISABLE		BIT(22)
>>  +#define JZ_LCD_CFG_SPL_DISABLE		BIT(21)
>>  +#define JZ_LCD_CFG_REV_DISABLE		BIT(20)
>>  +#define JZ_LCD_CFG_HSYNCM		BIT(19)
>>  +#define JZ_LCD_CFG_PCLKM		BIT(18)
>>  +#define JZ_LCD_CFG_INV			BIT(17)
>>  +#define JZ_LCD_CFG_SYNC_DIR		BIT(16)
>>  +#define JZ_LCD_CFG_PS_POLARITY		BIT(15)
>>  +#define JZ_LCD_CFG_CLS_POLARITY		BIT(14)
>>  +#define JZ_LCD_CFG_SPL_POLARITY		BIT(13)
>>  +#define JZ_LCD_CFG_REV_POLARITY		BIT(12)
>>  +#define JZ_LCD_CFG_HSYNC_ACTIVE_LOW	BIT(11)
>>  +#define JZ_LCD_CFG_PCLK_FALLING_EDGE	BIT(10)
>>  +#define JZ_LCD_CFG_DE_ACTIVE_LOW	BIT(9)
>>  +#define JZ_LCD_CFG_VSYNC_ACTIVE_LOW	BIT(8)
>>  +#define JZ_LCD_CFG_18_BIT		BIT(7)
>>  +#define JZ_LCD_CFG_PDW			(BIT(5) | BIT(4))
>>  +#define JZ_LCD_CFG_MODE_MASK		0xf
>>  +
>>  +#define JZ_LCD_VSYNC_VPS_OFFSET		16
>>  +#define JZ_LCD_VSYNC_VPE_OFFSET		0
>>  +
>>  +#define JZ_LCD_HSYNC_HPS_OFFSET		16
>>  +#define JZ_LCD_HSYNC_HPE_OFFSET		0
>>  +
>>  +#define JZ_LCD_VAT_HT_OFFSET		16
>>  +#define JZ_LCD_VAT_VT_OFFSET		0
>>  +
>>  +#define JZ_LCD_DAH_HDS_OFFSET		16
>>  +#define JZ_LCD_DAH_HDE_OFFSET		0
>>  +
>>  +#define JZ_LCD_DAV_VDS_OFFSET		16
>>  +#define JZ_LCD_DAV_VDE_OFFSET		0
>>  +
>>  +#define JZ_LCD_CTRL_BURST_4		(0x0 << 28)
>>  +#define JZ_LCD_CTRL_BURST_8		(0x1 << 28)
>>  +#define JZ_LCD_CTRL_BURST_16		(0x2 << 28)
>>  +#define JZ_LCD_CTRL_RGB555		BIT(27)
>>  +#define JZ_LCD_CTRL_OFUP		BIT(26)
>>  +#define JZ_LCD_CTRL_FRC_GRAYSCALE_16	(0x0 << 24)
>>  +#define JZ_LCD_CTRL_FRC_GRAYSCALE_4	(0x1 << 24)
>>  +#define JZ_LCD_CTRL_FRC_GRAYSCALE_2	(0x2 << 24)
>>  +#define JZ_LCD_CTRL_PDD_MASK		(0xff << 16)
>>  +#define JZ_LCD_CTRL_EOF_IRQ		BIT(13)
>>  +#define JZ_LCD_CTRL_SOF_IRQ		BIT(12)
>>  +#define JZ_LCD_CTRL_OFU_IRQ		BIT(11)
>>  +#define JZ_LCD_CTRL_IFU0_IRQ		BIT(10)
>>  +#define JZ_LCD_CTRL_IFU1_IRQ		BIT(9)
>>  +#define JZ_LCD_CTRL_DD_IRQ		BIT(8)
>>  +#define JZ_LCD_CTRL_QDD_IRQ		BIT(7)
>>  +#define JZ_LCD_CTRL_REVERSE_ENDIAN	BIT(6)
>>  +#define JZ_LCD_CTRL_LSB_FISRT		BIT(5)
>>  +#define JZ_LCD_CTRL_DISABLE		BIT(4)
>>  +#define JZ_LCD_CTRL_ENABLE		BIT(3)
>>  +#define JZ_LCD_CTRL_BPP_1		0x0
>>  +#define JZ_LCD_CTRL_BPP_2		0x1
>>  +#define JZ_LCD_CTRL_BPP_4		0x2
>>  +#define JZ_LCD_CTRL_BPP_8		0x3
>>  +#define JZ_LCD_CTRL_BPP_15_16		0x4
>>  +#define JZ_LCD_CTRL_BPP_18_24		0x5
>>  +#define JZ_LCD_CTRL_BPP_MASK		(JZ_LCD_CTRL_RGB555 | (0x7 << 0))
>>  +
>>  +#define JZ_LCD_CMD_SOF_IRQ		BIT(31)
>>  +#define JZ_LCD_CMD_EOF_IRQ		BIT(30)
>>  +#define JZ_LCD_CMD_ENABLE_PAL		BIT(28)
>>  +
>>  +#define JZ_LCD_SYNC_MASK		0x3ff
>>  +
>>  +#define JZ_LCD_STATE_EOF_IRQ		BIT(5)
>>  +#define JZ_LCD_STATE_SOF_IRQ		BIT(4)
>>  +#define JZ_LCD_STATE_DISABLED		BIT(0)
>>  +
>>  +struct ingenic_framedesc {
>>  +	uint32_t next;
>>  +	uint32_t addr;
>>  +	uint32_t id;
>>  +	uint32_t cmd;
>>  +} __packed;
>>  +
>>  +struct jz_soc_info {
>>  +	bool needs_dev_clk;
>>  +};
>>  +
>>  +struct ingenic_drm {
>>  +	struct device *dev;
> 
> Embedding is kinda the new thing, since it also prevents people from 
> using
> devm_ for this, which is (strictly speaking, not that it matters 
> much) the
> wrong lifetime for drm allocations. There's some patches from Noralf 
> that
> should land soon to make this a bit more convenient.

Sorry I didn't quite understand what you wrote here. What do you mean by
"embedding"?

>>  +	void __iomem *base;
>>  +	struct regmap *map;
>>  +	struct clk *lcd_clk, *pix_clk;
>>  +
>>  +	u32 lcd_mode;
>>  +
>>  +	struct ingenic_framedesc *framedesc;
>>  +	dma_addr_t framedesc_phys;
>>  +
>>  +	struct drm_device *drm;
>>  +	struct drm_plane primary;
>>  +	struct drm_crtc crtc;
>>  +	struct drm_connector connector;
>>  +	struct drm_encoder encoder;
> 
> Any reason you didn't opt for the drm_simple_display_pipe helpers? 
> Since
> you have just 1:1:1 between crtc/plane/encoder that will allow you to
> ditch lots of boilerplate.
> 
> https://dri.freedesktop.org/docs/drm/gpu/drm-kms-helpers.html#simple-kms-helper-reference

Yes, the reason is that I will then add support for newer SoCs that can
deal with overlay planes, have an integrated IPU for scaling and 
colorspace
conversion, and have different possible outputs (LCD panel, TV-out, 
HDMI).

>>  +	struct drm_panel *panel;
>>  +
>>  +	struct device_node *panel_node;
> 
> There's panel bridge helpers which takes a panel and wraps it into a
> drm_bridge (which you can glue into the simple pipe helpers), giving 
> you
> the connector for free.
> 
> https://dri.freedesktop.org/docs/drm/gpu/drm-kms-helpers.html#panel-bridge-helper-reference

I will look into it, thanks.

> This should cover all the bigger items, details look already really 
> tidy.
> 
> Cheers, Daniel
> 
>>  +
>>  +	unsigned short ps_start, ps_end, cls_start,
>>  +		       cls_end, spl_start, spl_end, rev_start;
>>  +};
>>  +
>>  +static const uint32_t ingenic_drm_primary_formats[] = {
>>  +	DRM_FORMAT_XRGB1555,
>>  +	DRM_FORMAT_RGB565,
>>  +	DRM_FORMAT_XRGB8888,
>>  +};
>>  +
>>  +static bool ingenic_drm_writeable_reg(struct device *dev, unsigned 
>> int reg)
>>  +{
>>  +	switch (reg) {
>>  +	case JZ_REG_LCD_IID:
>>  +	case JZ_REG_LCD_SA0:
>>  +	case JZ_REG_LCD_FID0:
>>  +	case JZ_REG_LCD_CMD0:
>>  +	case JZ_REG_LCD_SA1:
>>  +	case JZ_REG_LCD_FID1:
>>  +	case JZ_REG_LCD_CMD1:
>>  +		return false;
>>  +	default:
>>  +		return true;
>>  +	}
>>  +}
>>  +
>>  +static const struct regmap_config ingenic_drm_regmap_config = {
>>  +	.reg_bits = 32,
>>  +	.val_bits = 32,
>>  +	.reg_stride = 4,
>>  +
>>  +	.max_register = JZ_REG_LCD_CMD1,
>>  +	.writeable_reg = ingenic_drm_writeable_reg,
>>  +};
>>  +
>>  +static inline struct ingenic_drm *drm_crtc_get_priv(struct 
>> drm_crtc *crtc)
>>  +{
>>  +	return container_of(crtc, struct ingenic_drm, crtc);
>>  +}
>>  +
>>  +static inline struct ingenic_drm *drm_plane_get_priv(struct 
>> drm_plane *plane)
>>  +{
>>  +	return container_of(plane, struct ingenic_drm, primary);
>>  +}
>>  +
>>  +static inline struct ingenic_drm *drm_conn_get_priv(struct 
>> drm_connector *conn)
>>  +{
>>  +	return container_of(conn, struct ingenic_drm, connector);
>>  +}
>>  +
>>  +static void ingenic_drm_crtc_atomic_enable(struct drm_crtc *crtc,
>>  +					  struct drm_crtc_state *state)
>>  +{
>>  +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
>>  +
>>  +	regmap_write(priv->map, JZ_REG_LCD_STATE, 0);
>>  +
>>  +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
>>  +			   JZ_LCD_CTRL_ENABLE | JZ_LCD_CTRL_DISABLE,
>>  +			   JZ_LCD_CTRL_ENABLE);
>>  +
>>  +	drm_panel_enable(priv->panel);
>>  +
>>  +	drm_crtc_vblank_on(crtc);
>>  +}
>>  +
>>  +static void ingenic_drm_crtc_atomic_disable(struct drm_crtc *crtc,
>>  +					   struct drm_crtc_state *state)
>>  +{
>>  +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
>>  +	unsigned int var;
>>  +
>>  +	drm_crtc_vblank_off(crtc);
>>  +
>>  +	drm_panel_disable(priv->panel);
>>  +
>>  +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
>>  +			   JZ_LCD_CTRL_DISABLE, JZ_LCD_CTRL_DISABLE);
>>  +
>>  +	regmap_read_poll_timeout(priv->map, JZ_REG_LCD_STATE, var,
>>  +				 var & JZ_LCD_STATE_DISABLED,
>>  +				 1000, 0);
>>  +}
>>  +
>>  +static inline bool ingenic_drm_lcd_is_special_mode(u32 mode)
>>  +{
>>  +	switch (mode) {
>>  +	case JZ_DRM_LCD_SPECIAL_TFT_1:
>>  +	case JZ_DRM_LCD_SPECIAL_TFT_2:
>>  +	case JZ_DRM_LCD_SPECIAL_TFT_3:
>>  +		return true;
>>  +	default:
>>  +		return false;
>>  +	}
>>  +}
>>  +
>>  +static inline bool ingenic_drm_lcd_is_stn_mode(u32 mode)
>>  +{
>>  +	switch (mode) {
>>  +	case JZ_DRM_LCD_SINGLE_COLOR_STN:
>>  +	case JZ_DRM_LCD_SINGLE_MONOCHROME_STN:
>>  +	case JZ_DRM_LCD_DUAL_COLOR_STN:
>>  +	case JZ_DRM_LCD_DUAL_MONOCHROME_STN:
>>  +		return true;
>>  +	default:
>>  +		return false;
>>  +	}
>>  +}
>>  +
>>  +static void ingenic_drm_crtc_update_timings(struct ingenic_drm 
>> *priv,
>>  +					    struct drm_display_mode *mode)
>>  +{
>>  +	unsigned int vpe, vds, vde, vt, hpe, hds, hde, ht;
>>  +
>>  +	vpe = mode->vsync_end - mode->vsync_start;
>>  +	vds = mode->vtotal - mode->vsync_start;
>>  +	vde = vds + mode->vdisplay;
>>  +	vt = vde + mode->vsync_start - mode->vdisplay;
>>  +
>>  +	hpe = mode->hsync_end - mode->hsync_start;
>>  +	hds = mode->htotal - mode->hsync_start;
>>  +	hde = hds + mode->hdisplay;
>>  +	ht = hde + mode->hsync_start - mode->hdisplay;
>>  +
>>  +	regmap_write(priv->map, JZ_REG_LCD_VSYNC,
>>  +		     0 << JZ_LCD_VSYNC_VPS_OFFSET |
>>  +		     vpe << JZ_LCD_VSYNC_VPE_OFFSET);
>>  +
>>  +	regmap_write(priv->map, JZ_REG_LCD_HSYNC,
>>  +		     0 << JZ_LCD_HSYNC_HPS_OFFSET |
>>  +		     hpe << JZ_LCD_HSYNC_HPE_OFFSET);
>>  +
>>  +	regmap_write(priv->map, JZ_REG_LCD_VAT,
>>  +		     ht << JZ_LCD_VAT_HT_OFFSET |
>>  +		     vt << JZ_LCD_VAT_VT_OFFSET);
>>  +
>>  +	regmap_write(priv->map, JZ_REG_LCD_DAH,
>>  +		     hds << JZ_LCD_DAH_HDS_OFFSET |
>>  +		     hde << JZ_LCD_DAH_HDE_OFFSET);
>>  +	regmap_write(priv->map, JZ_REG_LCD_DAV,
>>  +		     vds << JZ_LCD_DAV_VDS_OFFSET |
>>  +		     vde << JZ_LCD_DAV_VDE_OFFSET);
>>  +
>>  +	if (ingenic_drm_lcd_is_special_mode(priv->lcd_mode)) {
>>  +		regmap_write(priv->map, JZ_REG_LCD_PS, hde << 16 | (hde + 1));
>>  +		regmap_write(priv->map, JZ_REG_LCD_CLS, hde << 16 | (hde + 1));
>>  +		regmap_write(priv->map, JZ_REG_LCD_SPL, hpe << 16 | (hpe + 1));
>>  +		regmap_write(priv->map, JZ_REG_LCD_REV, mode->htotal << 16);
>>  +	}
>>  +}
>>  +
>>  +static void ingenic_drm_crtc_update_cfg(struct ingenic_drm *priv,
>>  +					struct drm_display_mode *mode)
>>  +
>>  +{
>>  +	unsigned int cfg = priv->lcd_mode;
>>  +	u32 bus_flags = priv->connector.display_info.bus_flags;
>>  +
>>  +	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
>>  +		cfg |= JZ_LCD_CFG_HSYNC_ACTIVE_LOW;
>>  +	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
>>  +		cfg |= JZ_LCD_CFG_VSYNC_ACTIVE_LOW;
>>  +	if (bus_flags & DRM_BUS_FLAG_DE_LOW)
>>  +		cfg |= JZ_LCD_CFG_DE_ACTIVE_LOW;
>>  +	if (bus_flags & DRM_BUS_FLAG_PIXDATA_NEGEDGE)
>>  +		cfg |= JZ_LCD_CFG_PCLK_FALLING_EDGE;
>>  +
>>  +	if (ingenic_drm_lcd_is_special_mode(priv->lcd_mode)) {
>>  +		// TODO: Is that valid for all special modes?
>>  +		cfg |= JZ_LCD_CFG_REV_POLARITY;
>>  +	} else {
>>  +		cfg |= JZ_LCD_CFG_PS_DISABLE
>>  +		    | JZ_LCD_CFG_CLS_DISABLE
>>  +		    | JZ_LCD_CFG_SPL_DISABLE
>>  +		    | JZ_LCD_CFG_REV_DISABLE;
>>  +	}
>>  +
>>  +	regmap_write(priv->map, JZ_REG_LCD_CFG, cfg);
>>  +}
>>  +
>>  +static void ingenic_drm_crtc_update_ctrl(struct ingenic_drm *priv,
>>  +					 unsigned int bpp)
>>  +{
>>  +	unsigned int ctrl = JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16;
>>  +
>>  +	switch (bpp) {
>>  +	case 1:
>>  +		ctrl |= JZ_LCD_CTRL_BPP_1;
>>  +		break;
>>  +	case 2:
>>  +		ctrl |= JZ_LCD_CTRL_BPP_2;
>>  +		break;
>>  +	case 4:
>>  +		ctrl |= JZ_LCD_CTRL_BPP_4;
>>  +		break;
>>  +	case 8:
>>  +		ctrl |= JZ_LCD_CTRL_BPP_8;
>>  +	break;
>>  +	case 15:
>>  +		ctrl |= JZ_LCD_CTRL_RGB555; /* Falltrough */
>>  +	case 16:
>>  +		ctrl |= JZ_LCD_CTRL_BPP_15_16;
>>  +		break;
>>  +	case 18:
>>  +	case 24:
>>  +	case 32:
>>  +		ctrl |= JZ_LCD_CTRL_BPP_18_24;
>>  +		break;
>>  +	default:
>>  +		break;
>>  +	}
>>  +
>>  +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
>>  +			   JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16 |
>>  +			   JZ_LCD_CTRL_BPP_MASK, ctrl);
>>  +}
>>  +
>>  +static int ingenic_drm_crtc_atomic_check(struct drm_crtc *crtc,
>>  +					 struct drm_crtc_state *state)
>>  +{
>>  +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
>>  +	long rate;
>>  +
>>  +	if (!drm_atomic_crtc_needs_modeset(state))
>>  +		return 0;
>>  +
>>  +	rate = clk_round_rate(priv->pix_clk,
>>  +			      state->adjusted_mode.clock * 1000);
>>  +	if (rate < 0)
>>  +		return rate;
>>  +
>>  +	return 0;
>>  +}
>>  +
>>  +static void ingenic_drm_crtc_atomic_flush(struct drm_crtc *crtc,
>>  +					  struct drm_crtc_state *oldstate)
>>  +{
>>  +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
>>  +	struct drm_crtc_state *state = crtc->state;
>>  +	struct drm_pending_vblank_event *event = state->event;
>>  +	struct drm_framebuffer *drm_fb = crtc->primary->state->fb;
>>  +	const struct drm_format_info *finfo;
>>  +	unsigned int width, height;
>>  +
>>  +	if (drm_atomic_crtc_needs_modeset(state)) {
>>  +		finfo = drm_format_info(drm_fb->format->format);
>>  +		width = state->adjusted_mode.hdisplay;
>>  +		height = state->adjusted_mode.vdisplay;
>>  +
>>  +		ingenic_drm_crtc_update_timings(priv, &state->mode);
>>  +
>>  +		ingenic_drm_crtc_update_ctrl(priv, finfo->depth);
>>  +		ingenic_drm_crtc_update_cfg(priv, &state->adjusted_mode);
>>  +
>>  +		clk_set_rate(priv->pix_clk, state->adjusted_mode.clock * 1000);
>>  +
>>  +		regmap_write(priv->map, JZ_REG_LCD_DA0, priv->framedesc->next);
>>  +	}
>>  +
>>  +	if (event) {
>>  +		state->event = NULL;
>>  +
>>  +		spin_lock_irq(&crtc->dev->event_lock);
>>  +		if (drm_crtc_vblank_get(crtc) == 0)
>>  +			drm_crtc_arm_vblank_event(crtc, event);
>>  +		else
>>  +			drm_crtc_send_vblank_event(crtc, event);
>>  +		spin_unlock_irq(&crtc->dev->event_lock);
>>  +	}
>>  +}
>>  +
>>  +static void ingenic_drm_plane_atomic_update(struct drm_plane 
>> *plane,
>>  +					    struct drm_plane_state *oldstate)
>>  +{
>>  +	struct ingenic_drm *priv = drm_plane_get_priv(plane);
>>  +	struct drm_plane_state *state = plane->state;
>>  +	const struct drm_format_info *finfo;
>>  +	unsigned int width, height;
>>  +
>>  +	finfo = drm_format_info(state->fb->format->format);
>>  +	width = state->crtc->state->adjusted_mode.hdisplay;
>>  +	height = state->crtc->state->adjusted_mode.vdisplay;
>>  +
>>  +	priv->framedesc->addr = drm_fb_cma_get_gem_addr(state->fb, state, 
>> 0);
>>  +
>>  +	priv->framedesc->cmd = width * height * ((finfo->depth + 7) / 8) 
>> / 4;
>>  +	priv->framedesc->cmd |= JZ_LCD_CMD_EOF_IRQ;
>>  +}
>>  +
>>  +static enum drm_connector_status
>>  +ingenic_drm_conn_detect(struct drm_connector *conn, bool force)
>>  +{
>>  +	struct ingenic_drm *priv = drm_conn_get_priv(conn);
>>  +
>>  +	if (priv->panel) {
>>  +		drm_panel_attach(priv->panel, conn);
>>  +
>>  +		return connector_status_connected;
>>  +	}
>>  +
>>  +	return connector_status_disconnected;
>>  +}
>>  +
>>  +static void ingenic_drm_conn_destroy(struct drm_connector *conn)
>>  +{
>>  +	struct ingenic_drm *priv = drm_conn_get_priv(conn);
>>  +
>>  +	if (priv->panel)
>>  +		drm_panel_detach(priv->panel);
>>  +
>>  +	drm_connector_cleanup(conn);
>>  +}
>>  +
>>  +static int ingenic_drm_conn_get_modes(struct drm_connector *conn)
>>  +{
>>  +	struct ingenic_drm *priv = drm_conn_get_priv(conn);
>>  +
>>  +	if (priv->panel)
>>  +		return priv->panel->funcs->get_modes(priv->panel);
>>  +
>>  +	return 0;
>>  +}
>>  +
>>  +static irqreturn_t ingenic_drm_irq_handler(int irq, void *arg)
>>  +{
>>  +	struct drm_device *drm = arg;
>>  +	struct ingenic_drm *priv = drm->dev_private;
>>  +	unsigned int state;
>>  +
>>  +	regmap_read(priv->map, JZ_REG_LCD_STATE, &state);
>>  +
>>  +	regmap_update_bits(priv->map, JZ_REG_LCD_STATE,
>>  +			   JZ_LCD_STATE_EOF_IRQ, 0);
>>  +
>>  +	if (state & JZ_LCD_STATE_EOF_IRQ)
>>  +		drm_crtc_handle_vblank(&priv->crtc);
>>  +
>>  +	return IRQ_HANDLED;
>>  +}
>>  +
>>  +static int ingenic_drm_enable_vblank(struct drm_crtc *crtc)
>>  +{
>>  +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
>>  +
>>  +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
>>  +			   JZ_LCD_CTRL_EOF_IRQ, JZ_LCD_CTRL_EOF_IRQ);
>>  +
>>  +	return 0;
>>  +}
>>  +
>>  +static void ingenic_drm_disable_vblank(struct drm_crtc *crtc)
>>  +{
>>  +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
>>  +
>>  +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL, 
>> JZ_LCD_CTRL_EOF_IRQ, 0);
>>  +}
>>  +
>>  +DEFINE_DRM_GEM_CMA_FOPS(ingenic_drm_fops);
>>  +
>>  +static struct drm_driver ingenic_drm_driver_data = {
>>  +	.driver_features	= DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME
>>  +				| DRIVER_ATOMIC | DRIVER_HAVE_IRQ,
>>  +	.name			= "ingenic-drm",
>>  +	.desc			= "DRM module for Ingenic SoCs",
>>  +	.date			= "20190228",
>>  +	.major			= 1,
>>  +	.minor			= 0,
>>  +	.patchlevel		= 0,
>>  +
>>  +	.fops			= &ingenic_drm_fops,
>>  +
>>  +	.dumb_create		= drm_gem_cma_dumb_create,
>>  +	.gem_free_object_unlocked = drm_gem_cma_free_object,
>>  +	.gem_vm_ops		= &drm_gem_cma_vm_ops,
>>  +
>>  +	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
>>  +	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
>>  +	.gem_prime_import	= drm_gem_prime_import,
>>  +	.gem_prime_export	= drm_gem_prime_export,
>>  +	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
>>  +	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
>>  +	.gem_prime_vmap		= drm_gem_cma_prime_vmap,
>>  +	.gem_prime_vunmap	= drm_gem_cma_prime_vunmap,
>>  +	.gem_prime_mmap		= drm_gem_cma_prime_mmap,
>>  +
>>  +	.irq_handler		= ingenic_drm_irq_handler,
>>  +};
>>  +
>>  +static const struct drm_plane_funcs 
>> ingenic_drm_primary_plane_funcs = {
>>  +	.update_plane		= drm_atomic_helper_update_plane,
>>  +	.disable_plane		= drm_atomic_helper_disable_plane,
>>  +	.reset			= drm_atomic_helper_plane_reset,
>>  +
>>  +	.atomic_duplicate_state	= drm_atomic_helper_plane_duplicate_state,
>>  +	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
>>  +};
>>  +
>>  +static const struct drm_crtc_funcs ingenic_drm_crtc_funcs = {
>>  +	.reset			= drm_atomic_helper_crtc_reset,
>>  +	.set_config		= drm_atomic_helper_set_config,
>>  +	.page_flip		= drm_atomic_helper_page_flip,
>>  +
>>  +	.atomic_duplicate_state	= drm_atomic_helper_crtc_duplicate_state,
>>  +	.atomic_destroy_state	= drm_atomic_helper_crtc_destroy_state,
>>  +
>>  +	.enable_vblank		= ingenic_drm_enable_vblank,
>>  +	.disable_vblank		= ingenic_drm_disable_vblank,
>>  +
>>  +	.gamma_set		= drm_atomic_helper_legacy_gamma_set,
>>  +};
>>  +
>>  +static const struct drm_connector_funcs ingenic_drm_conn_funcs = {
>>  +	.fill_modes		= drm_helper_probe_single_connector_modes,
>>  +	.detect			= ingenic_drm_conn_detect,
>>  +	.destroy		= ingenic_drm_conn_destroy,
>>  +	.reset			= drm_atomic_helper_connector_reset,
>>  +	.atomic_duplicate_state	= 
>> drm_atomic_helper_connector_duplicate_state,
>>  +	.atomic_destroy_state	= drm_atomic_helper_connector_destroy_state,
>>  +};
>>  +
>>  +static const struct drm_plane_helper_funcs 
>> ingenic_drm_plane_helper_funcs = {
>>  +	.atomic_update		= ingenic_drm_plane_atomic_update,
>>  +	.prepare_fb		= drm_gem_fb_prepare_fb,
>>  +};
>>  +
>>  +static const struct drm_crtc_helper_funcs 
>> ingenic_drm_crtc_helper_funcs = {
>>  +	.atomic_enable		= ingenic_drm_crtc_atomic_enable,
>>  +	.atomic_disable		= ingenic_drm_crtc_atomic_disable,
>>  +	.atomic_flush		= ingenic_drm_crtc_atomic_flush,
>>  +	.atomic_check		= ingenic_drm_crtc_atomic_check,
>>  +};
>>  +
>>  +static const struct drm_connector_helper_funcs 
>> ingenic_drm_conn_helper_funcs = {
>>  +	.get_modes		= ingenic_drm_conn_get_modes,
>>  +};
>>  +
>>  +static const struct drm_mode_config_funcs 
>> ingenic_drm_mode_config_funcs = {
>>  +	.fb_create		= drm_gem_fb_create,
>>  +	.output_poll_changed	= drm_fb_helper_output_poll_changed,
>>  +	.atomic_check		= drm_atomic_helper_check,
>>  +	.atomic_commit		= drm_atomic_helper_commit,
>>  +};
>>  +
>>  +static const struct drm_encoder_funcs ingenic_drm_encoder_funcs = {
>>  +	.destroy		= drm_encoder_cleanup,
>>  +};
>>  +
>>  +static int ingenic_drm_probe(struct platform_device *pdev)
>>  +{
>>  +	const struct jz_soc_info *soc_info;
>>  +	struct device *dev = &pdev->dev;
>>  +	struct ingenic_drm *priv;
>>  +	struct clk *parent_clk;
>>  +	struct drm_device *drm;
>>  +	struct resource *mem;
>>  +	void __iomem *base;
>>  +	long parent_rate;
>>  +	int ret, irq;
>>  +
>>  +	soc_info = device_get_match_data(dev);
>>  +	if (!soc_info)
>>  +		return -EINVAL;
>>  +
>>  +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
>>  +	if (!priv)
>>  +		return -ENOMEM;
>>  +
>>  +	priv->dev = dev;
>>  +
>>  +	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>  +	priv->base = base = devm_ioremap_resource(dev, mem);
>>  +	if (IS_ERR(base))
>>  +		return PTR_ERR(base);
>>  +
>>  +	irq = platform_get_irq(pdev, 0);
>>  +	if (irq < 0) {
>>  +		dev_err(dev, "Failed to get platform irq\n");
>>  +		return -ENOENT;
>>  +	}
>>  +
>>  +	priv->map = devm_regmap_init_mmio(dev, base,
>>  +					  &ingenic_drm_regmap_config);
>>  +	if (IS_ERR(priv->map)) {
>>  +		dev_err(dev, "Failed to create regmap\n");
>>  +		return PTR_ERR(priv->map);
>>  +	}
>>  +
>>  +	if (soc_info->needs_dev_clk) {
>>  +		priv->lcd_clk = devm_clk_get(dev, "lcd");
>>  +		if (IS_ERR(priv->lcd_clk)) {
>>  +			dev_err(dev, "Failed to get lcd clock\n");
>>  +			return PTR_ERR(priv->lcd_clk);
>>  +		}
>>  +	}
>>  +
>>  +	priv->pix_clk = devm_clk_get(dev, "lcd_pclk");
>>  +	if (IS_ERR(priv->pix_clk)) {
>>  +		dev_err(dev, "Failed to get pixel clock\n");
>>  +		return PTR_ERR(priv->pix_clk);
>>  +	}
>>  +
>>  +	priv->panel_node = of_parse_phandle(dev->of_node, 
>> "ingenic,panel", 0);
>>  +	if (!priv->panel_node) {
>>  +		DRM_INFO("No panel found");
>>  +	} else {
>>  +		priv->panel = of_drm_find_panel(priv->panel_node);
>>  +		of_node_put(priv->panel_node);
>>  +
>>  +		if (IS_ERR(priv->panel)) {
>>  +			if (PTR_ERR(priv->panel) == -EPROBE_DEFER)
>>  +				return -EPROBE_DEFER;
>>  +
>>  +			priv->panel = NULL;
>>  +		} else {
>>  +			ret = drm_panel_prepare(priv->panel);
>>  +			if (ret && ret != -ENOSYS)
>>  +				return ret;
>>  +		}
>>  +	}
>>  +
>>  +	if (priv->panel) {
>>  +		ret = device_property_read_u32(dev, "ingenic,lcd-mode",
>>  +					       &priv->lcd_mode);
>>  +		if (ret) {
>>  +			dev_err(dev, "Unable to read ingenic,lcd-mode property\n");
>>  +			return ret;
>>  +		}
>>  +	}
>>  +
>>  +	priv->framedesc = dma_alloc_coherent(dev, 
>> sizeof(*priv->framedesc),
>>  +					     &priv->framedesc_phys, GFP_KERNEL);
>>  +	if (!priv->framedesc)
>>  +		return -ENOMEM;
>>  +
>>  +	priv->framedesc->next = priv->framedesc_phys;
>>  +	priv->framedesc->id = 0xdeafbead;
>>  +
>>  +	drm = drm_dev_alloc(&ingenic_drm_driver_data, dev);
>>  +	if (IS_ERR(drm)) {
>>  +		ret = PTR_ERR(drm);
>>  +		goto err_free_dma;
>>  +	}
>>  +
>>  +	priv->drm = drm;
>>  +
>>  +	drm_mode_config_init(drm);
>>  +	drm->mode_config.min_width = 0;
>>  +	drm->mode_config.min_height = 0;
>>  +	drm->mode_config.max_width = 800;
>>  +	drm->mode_config.max_height = 600;
>>  +	drm->mode_config.funcs = &ingenic_drm_mode_config_funcs;
>>  +
>>  +	drm_plane_helper_add(&priv->primary, 
>> &ingenic_drm_plane_helper_funcs);
>>  +
>>  +	ret = drm_universal_plane_init(drm, &priv->primary,
>>  +				       0, &ingenic_drm_primary_plane_funcs,
>>  +				       ingenic_drm_primary_formats,
>>  +				       ARRAY_SIZE(ingenic_drm_primary_formats),
>>  +				       NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
>>  +	if (ret) {
>>  +		dev_err(dev, "Failed to register primary plane: %i\n", ret);
>>  +		goto err_unref_drm;
>>  +	}
>>  +
>>  +	drm_crtc_helper_add(&priv->crtc, &ingenic_drm_crtc_helper_funcs);
>>  +
>>  +	ret = drm_crtc_init_with_planes(drm, &priv->crtc, &priv->primary,
>>  +					NULL, &ingenic_drm_crtc_funcs, NULL);
>>  +	if (ret) {
>>  +		dev_err(dev, "Failed to init CRTC: %i\n", ret);
>>  +		goto err_cleanup_plane;
>>  +	}
>>  +
>>  +	drm_connector_helper_add(&priv->connector,
>>  +				 &ingenic_drm_conn_helper_funcs);
>>  +	ret = drm_connector_init(drm, &priv->connector,
>>  +				 &ingenic_drm_conn_funcs,
>>  +				 DRM_MODE_CONNECTOR_Unknown);
>>  +	if (ret) {
>>  +		dev_err(dev, "Failed to init connector: %i\n", ret);
>>  +		goto err_cleanup_crtc;
>>  +	}
>>  +
>>  +	priv->encoder.possible_crtcs = 1;
>>  +
>>  +	ret = drm_encoder_init(drm, &priv->encoder, 
>> &ingenic_drm_encoder_funcs,
>>  +			       DRM_MODE_ENCODER_NONE, NULL);
>>  +	if (ret) {
>>  +		dev_err(dev, "Failed to init encoder: %i\n", ret);
>>  +		goto err_cleanup_connector;
>>  +	}
>>  +
>>  +	drm_connector_attach_encoder(&priv->connector, &priv->encoder);
>>  +
>>  +	platform_set_drvdata(pdev, drm);
>>  +	priv->drm = drm;
>>  +	drm->dev_private = priv;
>>  +
>>  +	ret = drm_irq_install(drm, irq);
>>  +	if (ret) {
>>  +		dev_err(dev, "Unable to install IRQ handler\n");
>>  +		goto err_cleanup_encoder;
>>  +	}
>>  +
>>  +	ret = drm_vblank_init(drm, 1);
>>  +	if (ret) {
>>  +		dev_err(dev, "Failed calling drm_vblank_init()\n");
>>  +		goto err_uninstall_irq;
>>  +	}
>>  +
>>  +	drm_mode_config_reset(drm);
>>  +
>>  +	ret = clk_prepare_enable(priv->pix_clk);
>>  +	if (ret) {
>>  +		dev_err(dev, "Unable to start pixel clock\n");
>>  +		goto err_cleanup_vblank;
>>  +	}
>>  +
>>  +	if (priv->lcd_clk) {
>>  +		parent_clk = clk_get_parent(priv->lcd_clk);
>>  +		parent_rate = clk_get_rate(parent_clk);
>>  +
>>  +		/* LCD Device clock must be 3x the pixel clock for STN panels,
>>  +		 * or 1.5x the pixel clock for TFT panels. To avoid having to
>>  +		 * check for the LCD device clock everytime we do a mode change,
>>  +		 * we set the LCD device clock to the highest rate possible.
>>  +		 */
>>  +		ret = clk_set_rate(priv->lcd_clk, parent_rate);
>>  +		if (ret) {
>>  +			dev_err(dev, "Unable to set LCD clock rate\n");
>>  +			goto err_pixclk_disable;
>>  +		}
>>  +
>>  +		ret = clk_prepare_enable(priv->lcd_clk);
>>  +		if (ret) {
>>  +			dev_err(dev, "Unable to start lcd clock\n");
>>  +			goto err_pixclk_disable;
>>  +		}
>>  +	}
>>  +
>>  +	ret = drm_fbdev_generic_setup(drm, 16);
>>  +	if (ret) {
>>  +		dev_err(dev, "Failed to init fbdev\n");
>>  +		goto err_devclk_disable;
>>  +	}
>>  +
>>  +	ret = drm_dev_register(drm, 0);
>>  +	if (ret) {
>>  +		dev_err(dev, "Failed to register DRM driver\n");
>>  +		goto err_cleanup_fbdev;
>>  +	}
>>  +
>>  +	return 0;
>>  +
>>  +err_cleanup_fbdev:
>>  +	drm_mode_config_cleanup(drm);
>>  +err_devclk_disable:
>>  +	if (priv->lcd_clk)
>>  +		clk_disable_unprepare(priv->lcd_clk);
>>  +err_pixclk_disable:
>>  +	clk_disable_unprepare(priv->pix_clk);
>>  +err_cleanup_vblank:
>>  +	drm_vblank_cleanup(drm);
>>  +err_uninstall_irq:
>>  +	drm_irq_uninstall(drm);
>>  +err_cleanup_encoder:
>>  +	drm_encoder_cleanup(&priv->encoder);
>>  +err_cleanup_connector:
>>  +	drm_connector_cleanup(&priv->connector);
>>  +err_cleanup_crtc:
>>  +	drm_crtc_cleanup(&priv->crtc);
>>  +err_cleanup_plane:
>>  +	drm_plane_cleanup(&priv->primary);
>>  +err_unref_drm:
>>  +	drm_dev_put(drm);
>>  +err_free_dma:
>>  +	dma_free_coherent(dev, sizeof(*priv->framedesc),
>>  +			  priv->framedesc, priv->framedesc_phys);
>>  +	return ret;
>>  +}
>>  +
>>  +static int ingenic_drm_remove(struct platform_device *pdev)
>>  +{
>>  +	struct drm_device *drm = platform_get_drvdata(pdev);
>>  +	struct ingenic_drm *priv = drm->dev_private;
>>  +
>>  +	drm_dev_unregister(drm);
>>  +	drm_mode_config_cleanup(drm);
>>  +
>>  +	if (priv->lcd_clk)
>>  +		clk_disable_unprepare(priv->lcd_clk);
>>  +	clk_disable_unprepare(priv->pix_clk);
>>  +
>>  +	drm_vblank_cleanup(drm);
>>  +	drm_irq_uninstall(drm);
>>  +
>>  +	drm_encoder_cleanup(&priv->encoder);
>>  +	drm_connector_cleanup(&priv->connector);
>>  +	drm_crtc_cleanup(&priv->crtc);
>>  +	drm_plane_cleanup(&priv->primary);
>>  +
>>  +	drm_dev_put(drm);
>>  +
>>  +	dma_free_coherent(&pdev->dev, sizeof(*priv->framedesc),
>>  +			  priv->framedesc, priv->framedesc_phys);
>>  +
>>  +	return 0;
>>  +}
>>  +
>>  +static const struct jz_soc_info jz4740_soc_info = {
>>  +	.needs_dev_clk = true,
>>  +};
>>  +
>>  +static const struct jz_soc_info jz4725b_soc_info = {
>>  +	.needs_dev_clk = false,
>>  +};
>>  +
>>  +static const struct of_device_id ingenic_drm_of_match[] = {
>>  +	{ .compatible = "ingenic,jz4740-drm", .data = &jz4740_soc_info },
>>  +	{ .compatible = "ingenic,jz4725b-drm", .data = &jz4725b_soc_info 
>> },
>>  +	{},
>>  +};
>>  +
>>  +static struct platform_driver ingenic_drm_driver = {
>>  +	.driver = {
>>  +		.name = "ingenic-drm",
>>  +		.of_match_table = of_match_ptr(ingenic_drm_of_match),
>>  +	},
>>  +	.probe = ingenic_drm_probe,
>>  +	.remove = ingenic_drm_remove,
>>  +};
>>  +module_platform_driver(ingenic_drm_driver);
>>  +
>>  +MODULE_AUTHOR("Paul Cercueil <[e-mail]>");
>>  +MODULE_DESCRIPTION("DRM driver for the Ingenic SoCs\n");
>>  +MODULE_LICENSE("GPL v2");
>>  --
>>  2.11.0
>> 
> 
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch

Sam Ravnborg March 1, 2019, 9 p.m. UTC | #2

Hi Paul.

Driver looks good and is a very nice piece of work.
In the following a number of minor issues.

One area that jumped at me was framedesc and the use of dma_alloc_coherent()
I hope someone that knows the memory handling better can give some advice here.
To me it looks like something drm should be able to help you with.

	Sam

> --- a/drivers/gpu/drm/Makefile
> +++ b/drivers/gpu/drm/Makefile
> @@ -94,6 +94,7 @@ obj-$(CONFIG_DRM_TEGRA) += tegra/
>  obj-$(CONFIG_DRM_STM) += stm/
>  obj-$(CONFIG_DRM_STI) += sti/
>  obj-$(CONFIG_DRM_IMX) += imx/
> +obj-y			+= ingenic/

To avoid visiting ingenic/ dir for every build use:
obj-$(CONFIG_DRM_INGENIC) += ingennic/

And accept that you need to do this also in ingenic/Makefile

>  obj-$(CONFIG_DRM_MEDIATEK) += mediatek/
>  obj-$(CONFIG_DRM_MESON)	+= meson/
>  obj-y			+= i2c/
> +#include <drm/drm_gem_cma_helper.h>
> +#include <drm/drm_fb_cma_helper.h>
> +#include <drm/drm_fb_helper.h>
> +#include <drm/drm_fourcc.h>
> +#include <drm/drm_gem_framebuffer_helper.h>
> +#include <drm/drm_irq.h>
> +#include <drm/drm_panel.h>
> +#include <drm/drm_plane.h>
> +#include <drm/drm_plane_helper.h>
> +#include <drm/drm_probe_helper.h>
> +#include <drm/drm_vblank.h>
> +
> +#include <dt-bindings/display/ingenic,drm.h>
> +
> +#include "../drm_internal.h"
No other drivers needs drm_internal.h - what makes this driver special?
Or do we have something in drm_internal that should be moved to
include/drm/ ?

> +struct ingenic_framedesc {
> +	uint32_t next;
> +	uint32_t addr;
> +	uint32_t id;
> +	uint32_t cmd;
> +} __packed;
For internel types u32 is the typical use.
uint32_t is usually used in uapi.

Consider to use dma_addr_t for addresses - we see this in other drivers.
If there are alignemnt constraints then add these.

> +
> +struct jz_soc_info {
> +	bool needs_dev_clk;
> +};
> +
> +struct ingenic_drm {
> +	struct device *dev;
> +	void __iomem *base;
> +	struct regmap *map;
> +	struct clk *lcd_clk, *pix_clk;
> +
> +	u32 lcd_mode;
> +
> +	struct ingenic_framedesc *framedesc;
> +	dma_addr_t framedesc_phys;
> +
> +	struct drm_device *drm;
> +	struct drm_plane primary;
> +	struct drm_crtc crtc;
> +	struct drm_connector connector;
> +	struct drm_encoder encoder;
> +	struct drm_panel *panel;
> +
> +	struct device_node *panel_node;
panel_node is not used outside ingenic_drm_probe() so no need
to have it here.

> +
> +	unsigned short ps_start, ps_end, cls_start,
> +		       cls_end, spl_start, spl_end, rev_start;
I do not see these used, they can all be dropped.

> +};
> +
> +
> +static const struct regmap_config ingenic_drm_regmap_config = {
> +	.reg_bits = 32,
> +	.val_bits = 32,
> +	.reg_stride = 4,
> +
> +	.max_register = JZ_REG_LCD_CMD1,
> +	.writeable_reg = ingenic_drm_writeable_reg,
> +};

+1 for using regmap.

> +
> +static inline bool ingenic_drm_lcd_is_special_mode(u32 mode)
> +{
> +	switch (mode) {
> +	case JZ_DRM_LCD_SPECIAL_TFT_1:
> +	case JZ_DRM_LCD_SPECIAL_TFT_2:
> +	case JZ_DRM_LCD_SPECIAL_TFT_3:
> +		return true;
> +	default:
> +		return false;
> +	}
> +}
Does it make sense to support these modes today?
If it is not used in practice then no need to carry it in the driver.


> +
> +static inline bool ingenic_drm_lcd_is_stn_mode(u32 mode)
> +{
> +	switch (mode) {
> +	case JZ_DRM_LCD_SINGLE_COLOR_STN:
> +	case JZ_DRM_LCD_SINGLE_MONOCHROME_STN:
> +	case JZ_DRM_LCD_DUAL_COLOR_STN:
> +	case JZ_DRM_LCD_DUAL_MONOCHROME_STN:
> +		return true;
> +	default:
> +		return false;
> +	}
> +}
This function is not used and can be deleted.
stn display are not really worth it these days anyway.


> +static void ingenic_drm_crtc_atomic_flush(struct drm_crtc *crtc,
> +					  struct drm_crtc_state *oldstate)
> +{
> +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> +	struct drm_crtc_state *state = crtc->state;
> +	struct drm_pending_vblank_event *event = state->event;
> +	struct drm_framebuffer *drm_fb = crtc->primary->state->fb;
> +	const struct drm_format_info *finfo;
> +	unsigned int width, height;
> +
> +	if (drm_atomic_crtc_needs_modeset(state)) {
> +		finfo = drm_format_info(drm_fb->format->format);
> +		width = state->adjusted_mode.hdisplay;
> +		height = state->adjusted_mode.vdisplay;

width and height are unused and can be dropped.

> +
> +		ingenic_drm_crtc_update_timings(priv, &state->mode);
> +
> +		ingenic_drm_crtc_update_ctrl(priv, finfo->depth);
> +		ingenic_drm_crtc_update_cfg(priv, &state->adjusted_mode);
> +
> +		clk_set_rate(priv->pix_clk, state->adjusted_mode.clock * 1000);
> +
> +		regmap_write(priv->map, JZ_REG_LCD_DA0, priv->framedesc->next);
> +	}
> +
> +	if (event) {
> +		state->event = NULL;
> +
> +		spin_lock_irq(&crtc->dev->event_lock);
> +		if (drm_crtc_vblank_get(crtc) == 0)
> +			drm_crtc_arm_vblank_event(crtc, event);
> +		else
> +			drm_crtc_send_vblank_event(crtc, event);
> +		spin_unlock_irq(&crtc->dev->event_lock);
> +	}
> +}
> +
> +static void ingenic_drm_plane_atomic_update(struct drm_plane *plane,
> +					    struct drm_plane_state *oldstate)
> +{
> +	struct ingenic_drm *priv = drm_plane_get_priv(plane);
> +	struct drm_plane_state *state = plane->state;
> +	const struct drm_format_info *finfo;
> +	unsigned int width, height;
> +
> +	finfo = drm_format_info(state->fb->format->format);
> +	width = state->crtc->state->adjusted_mode.hdisplay;
> +	height = state->crtc->state->adjusted_mode.vdisplay;
adjusted_mode->{h,v}display are both ints. So there is a hidden conversion to unsigned int here.
and framedesc->cmd is uint32_t then this is maybe fine.
Noticed so added a comment about it.

> +
> +	priv->framedesc->addr = drm_fb_cma_get_gem_addr(state->fb, state, 0);
> +
> +	priv->framedesc->cmd = width * height * ((finfo->depth + 7) / 8) / 4;
> +	priv->framedesc->cmd |= JZ_LCD_CMD_EOF_IRQ;
> +}
> +
> +static struct drm_driver ingenic_drm_driver_data = {
> +	.driver_features	= DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME
> +				| DRIVER_ATOMIC | DRIVER_HAVE_IRQ,

DRIVER_HAVE_IRQ are only for legacy drivers these days.
You can drop it.

> +	.name			= "ingenic-drm",
> +	.desc			= "DRM module for Ingenic SoCs",
> +	.date			= "20190228",
> +	.major			= 1,
> +	.minor			= 0,
> +	.patchlevel		= 0,
> +
> +	.fops			= &ingenic_drm_fops,
> +
> +	.dumb_create		= drm_gem_cma_dumb_create,
> +	.gem_free_object_unlocked = drm_gem_cma_free_object,
> +	.gem_vm_ops		= &drm_gem_cma_vm_ops,
> +
> +	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
> +	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,

> +	.gem_prime_import	= drm_gem_prime_import,
> +	.gem_prime_export	= drm_gem_prime_export,
The two assignments above are not needed. This is the default behaviour. See drm_drv.h
(from drm-misc-next)

> +static int ingenic_drm_probe(struct platform_device *pdev)
> +{
> +	const struct jz_soc_info *soc_info;
> +	struct device *dev = &pdev->dev;
> +	struct ingenic_drm *priv;
> +	struct clk *parent_clk;
> +	struct drm_device *drm;
> +	struct resource *mem;
> +	void __iomem *base;
> +	long parent_rate;
> +	int ret, irq;
> +
> +	soc_info = device_get_match_data(dev);
> +	if (!soc_info)
> +		return -EINVAL;
> +
> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	priv->dev = dev;
> +
> +	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	priv->base = base = devm_ioremap_resource(dev, mem);
> +	if (IS_ERR(base))
> +		return PTR_ERR(base);
> +
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq < 0) {
> +		dev_err(dev, "Failed to get platform irq\n");
> +		return -ENOENT;
> +	}
> +
> +	priv->map = devm_regmap_init_mmio(dev, base,
> +					  &ingenic_drm_regmap_config);
> +	if (IS_ERR(priv->map)) {
> +		dev_err(dev, "Failed to create regmap\n");
> +		return PTR_ERR(priv->map);
> +	}
> +
> +	if (soc_info->needs_dev_clk) {
> +		priv->lcd_clk = devm_clk_get(dev, "lcd");
> +		if (IS_ERR(priv->lcd_clk)) {
> +			dev_err(dev, "Failed to get lcd clock\n");
> +			return PTR_ERR(priv->lcd_clk);
> +		}
> +	}
> +
> +	priv->pix_clk = devm_clk_get(dev, "lcd_pclk");
> +	if (IS_ERR(priv->pix_clk)) {
> +		dev_err(dev, "Failed to get pixel clock\n");
> +		return PTR_ERR(priv->pix_clk);
> +	}
> +
> +	priv->panel_node = of_parse_phandle(dev->of_node, "ingenic,panel", 0);
> +	if (!priv->panel_node) {
> +		DRM_INFO("No panel found");
> +	} else {
> +		priv->panel = of_drm_find_panel(priv->panel_node);
> +		of_node_put(priv->panel_node);
> +
> +		if (IS_ERR(priv->panel)) {
> +			if (PTR_ERR(priv->panel) == -EPROBE_DEFER)
> +				return -EPROBE_DEFER;
> +
> +			priv->panel = NULL;
> +		} else {
> +			ret = drm_panel_prepare(priv->panel);
> +			if (ret && ret != -ENOSYS)
> +				return ret;
> +		}
> +	}
> +
> +	if (priv->panel) {
> +		ret = device_property_read_u32(dev, "ingenic,lcd-mode",
> +					       &priv->lcd_mode);
> +		if (ret) {
> +			dev_err(dev, "Unable to read ingenic,lcd-mode property\n");
> +			return ret;
> +		}
> +	}
> +
> +	priv->framedesc = dma_alloc_coherent(dev, sizeof(*priv->framedesc),
> +					     &priv->framedesc_phys, GFP_KERNEL);
> +	if (!priv->framedesc)
> +		return -ENOMEM;
> +
> +	priv->framedesc->next = priv->framedesc_phys;
> +	priv->framedesc->id = 0xdeafbead;
I did not really follow this code.
But you have framedesc that include a next pointer which is uint32_t,
and you assign to it framedesc_phys which is dmaaddr_t.
This looks fishy to me, but maybe it is fine.

When browsing other drivers I see uses of for example {dma,dmam}_pool_create()

When lookign at the origianl fbdev code it is obvious where this comes from.
Notice that in the fbdev code JZ_REG_LCD_DA0 register is updated in the enable function.
This is done different in this driver.
Just an observation, what is right I dunno.

> +static int ingenic_drm_remove(struct platform_device *pdev)
> +{
> +	struct drm_device *drm = platform_get_drvdata(pdev);
> +	struct ingenic_drm *priv = drm->dev_private;
> +
> +	drm_dev_unregister(drm);
> +	drm_mode_config_cleanup(drm);
> +
> +	if (priv->lcd_clk)
> +		clk_disable_unprepare(priv->lcd_clk);
> +	clk_disable_unprepare(priv->pix_clk);
> +
> +	drm_vblank_cleanup(drm);
> +	drm_irq_uninstall(drm);
> +
> +	drm_encoder_cleanup(&priv->encoder);
> +	drm_connector_cleanup(&priv->connector);
> +	drm_crtc_cleanup(&priv->crtc);
> +	drm_plane_cleanup(&priv->primary);
> +
> +	drm_dev_put(drm);
> +
> +	dma_free_coherent(&pdev->dev, sizeof(*priv->framedesc),
> +			  priv->framedesc, priv->framedesc_phys);
> +
> +	return 0;
> +}
> +
> +static const struct jz_soc_info jz4740_soc_info = {
> +	.needs_dev_clk = true,
> +};
> +
> +static const struct jz_soc_info jz4725b_soc_info = {
> +	.needs_dev_clk = false,
> +};
> +
> +static const struct of_device_id ingenic_drm_of_match[] = {
> +	{ .compatible = "ingenic,jz4740-drm", .data = &jz4740_soc_info },
> +	{ .compatible = "ingenic,jz4725b-drm", .data = &jz4725b_soc_info },
> +	{},
Use /* sentinel */ like in most drivers.

Paul Cercueil March 1, 2019, 11:33 p.m. UTC | #3

Hi,

Le ven. 1 mars 2019 à 18:00, Sam Ravnborg <[e-mail]> a écrit :
> Hi Paul.
> 
> Driver looks good and is a very nice piece of work.
> In the following a number of minor issues.
> 
> One area that jumped at me was framedesc and the use of 
> dma_alloc_coherent()
> I hope someone that knows the memory handling better can give some 
> advice here.
> To me it looks like something drm should be able to help you with.
> 
> 	Sam
> 
>>  --- a/drivers/gpu/drm/Makefile
>>  +++ b/drivers/gpu/drm/Makefile
>>  @@ -94,6 +94,7 @@ obj-$(CONFIG_DRM_TEGRA) += tegra/
>>   obj-$(CONFIG_DRM_STM) += stm/
>>   obj-$(CONFIG_DRM_STI) += sti/
>>   obj-$(CONFIG_DRM_IMX) += imx/
>>  +obj-y			+= ingenic/
> 
> To avoid visiting ingenic/ dir for every build use:
> obj-$(CONFIG_DRM_INGENIC) += ingennic/
> 
> And accept that you need to do this also in ingenic/Makefile

OK.

>>   obj-$(CONFIG_DRM_MEDIATEK) += mediatek/
>>   obj-$(CONFIG_DRM_MESON)	+= meson/
>>   obj-y			+= i2c/
>>  +#include <drm/drm_gem_cma_helper.h>
>>  +#include <drm/drm_fb_cma_helper.h>
>>  +#include <drm/drm_fb_helper.h>
>>  +#include <drm/drm_fourcc.h>
>>  +#include <drm/drm_gem_framebuffer_helper.h>
>>  +#include <drm/drm_irq.h>
>>  +#include <drm/drm_panel.h>
>>  +#include <drm/drm_plane.h>
>>  +#include <drm/drm_plane_helper.h>
>>  +#include <drm/drm_probe_helper.h>
>>  +#include <drm/drm_vblank.h>
>>  +
>>  +#include <dt-bindings/display/ingenic,drm.h>
>>  +
>>  +#include "../drm_internal.h"
> No other drivers needs drm_internal.h - what makes this driver 
> special?
> Or do we have something in drm_internal that should be moved to
> include/drm/ ?

I needed to include it for drm_vblank_cleanup().
But I guess I don't need to call that function? It's not obvious to me
how the error handling and driver removal should be done.

>>  +struct ingenic_framedesc {
>>  +	uint32_t next;
>>  +	uint32_t addr;
>>  +	uint32_t id;
>>  +	uint32_t cmd;
>>  +} __packed;
> For internel types u32 is the typical use.
> uint32_t is usually used in uapi.
> 
> Consider to use dma_addr_t for addresses - we see this in other 
> drivers.
> If there are alignemnt constraints then add these.

So 'ingenic_framedesc' represents a DMA descriptor, in the format that
the hardware expects it. The fields must be 32-bit. Is a dma_addr_t
the best option in that case?

>>  +
>>  +struct jz_soc_info {
>>  +	bool needs_dev_clk;
>>  +};
>>  +
>>  +struct ingenic_drm {
>>  +	struct device *dev;
>>  +	void __iomem *base;
>>  +	struct regmap *map;
>>  +	struct clk *lcd_clk, *pix_clk;
>>  +
>>  +	u32 lcd_mode;
>>  +
>>  +	struct ingenic_framedesc *framedesc;
>>  +	dma_addr_t framedesc_phys;
>>  +
>>  +	struct drm_device *drm;
>>  +	struct drm_plane primary;
>>  +	struct drm_crtc crtc;
>>  +	struct drm_connector connector;
>>  +	struct drm_encoder encoder;
>>  +	struct drm_panel *panel;
>>  +
>>  +	struct device_node *panel_node;
> panel_node is not used outside ingenic_drm_probe() so no need
> to have it here.

Noted.

> 
>>  +
>>  +	unsigned short ps_start, ps_end, cls_start,
>>  +		       cls_end, spl_start, spl_end, rev_start;
> I do not see these used, they can all be dropped.
> 
>>  +};
>>  +
>>  +
>>  +static const struct regmap_config ingenic_drm_regmap_config = {
>>  +	.reg_bits = 32,
>>  +	.val_bits = 32,
>>  +	.reg_stride = 4,
>>  +
>>  +	.max_register = JZ_REG_LCD_CMD1,
>>  +	.writeable_reg = ingenic_drm_writeable_reg,
>>  +};
> 
> +1 for using regmap.
> 
>>  +
>>  +static inline bool ingenic_drm_lcd_is_special_mode(u32 mode)
>>  +{
>>  +	switch (mode) {
>>  +	case JZ_DRM_LCD_SPECIAL_TFT_1:
>>  +	case JZ_DRM_LCD_SPECIAL_TFT_2:
>>  +	case JZ_DRM_LCD_SPECIAL_TFT_3:
>>  +		return true;
>>  +	default:
>>  +		return false;
>>  +	}
>>  +}
> Does it make sense to support these modes today?
> If it is not used in practice then no need to carry it in the driver.

Yes, I have a board that uses such a panel.

>>  +
>>  +static inline bool ingenic_drm_lcd_is_stn_mode(u32 mode)
>>  +{
>>  +	switch (mode) {
>>  +	case JZ_DRM_LCD_SINGLE_COLOR_STN:
>>  +	case JZ_DRM_LCD_SINGLE_MONOCHROME_STN:
>>  +	case JZ_DRM_LCD_DUAL_COLOR_STN:
>>  +	case JZ_DRM_LCD_DUAL_MONOCHROME_STN:
>>  +		return true;
>>  +	default:
>>  +		return false;
>>  +	}
>>  +}
> This function is not used and can be deleted.
> stn display are not really worth it these days anyway.
> 
> 
>>  +static void ingenic_drm_crtc_atomic_flush(struct drm_crtc *crtc,
>>  +					  struct drm_crtc_state *oldstate)
>>  +{
>>  +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
>>  +	struct drm_crtc_state *state = crtc->state;
>>  +	struct drm_pending_vblank_event *event = state->event;
>>  +	struct drm_framebuffer *drm_fb = crtc->primary->state->fb;
>>  +	const struct drm_format_info *finfo;
>>  +	unsigned int width, height;
>>  +
>>  +	if (drm_atomic_crtc_needs_modeset(state)) {
>>  +		finfo = drm_format_info(drm_fb->format->format);
>>  +		width = state->adjusted_mode.hdisplay;
>>  +		height = state->adjusted_mode.vdisplay;
> 
> width and height are unused and can be dropped.
> 
>>  +
>>  +		ingenic_drm_crtc_update_timings(priv, &state->mode);
>>  +
>>  +		ingenic_drm_crtc_update_ctrl(priv, finfo->depth);
>>  +		ingenic_drm_crtc_update_cfg(priv, &state->adjusted_mode);
>>  +
>>  +		clk_set_rate(priv->pix_clk, state->adjusted_mode.clock * 1000);
>>  +
>>  +		regmap_write(priv->map, JZ_REG_LCD_DA0, priv->framedesc->next);
>>  +	}
>>  +
>>  +	if (event) {
>>  +		state->event = NULL;
>>  +
>>  +		spin_lock_irq(&crtc->dev->event_lock);
>>  +		if (drm_crtc_vblank_get(crtc) == 0)
>>  +			drm_crtc_arm_vblank_event(crtc, event);
>>  +		else
>>  +			drm_crtc_send_vblank_event(crtc, event);
>>  +		spin_unlock_irq(&crtc->dev->event_lock);
>>  +	}
>>  +}
>>  +
>>  +static void ingenic_drm_plane_atomic_update(struct drm_plane 
>> *plane,
>>  +					    struct drm_plane_state *oldstate)
>>  +{
>>  +	struct ingenic_drm *priv = drm_plane_get_priv(plane);
>>  +	struct drm_plane_state *state = plane->state;
>>  +	const struct drm_format_info *finfo;
>>  +	unsigned int width, height;
>>  +
>>  +	finfo = drm_format_info(state->fb->format->format);
>>  +	width = state->crtc->state->adjusted_mode.hdisplay;
>>  +	height = state->crtc->state->adjusted_mode.vdisplay;
> adjusted_mode->{h,v}display are both ints. So there is a hidden 
> conversion to unsigned int here.
> and framedesc->cmd is uint32_t then this is maybe fine.
> Noticed so added a comment about it.
> 
>>  +
>>  +	priv->framedesc->addr = drm_fb_cma_get_gem_addr(state->fb, state, 
>> 0);
>>  +
>>  +	priv->framedesc->cmd = width * height * ((finfo->depth + 7) / 8) 
>> / 4;
>>  +	priv->framedesc->cmd |= JZ_LCD_CMD_EOF_IRQ;
>>  +}
>>  +
>>  +static struct drm_driver ingenic_drm_driver_data = {
>>  +	.driver_features	= DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME
>>  +				| DRIVER_ATOMIC | DRIVER_HAVE_IRQ,
> 
> DRIVER_HAVE_IRQ are only for legacy drivers these days.
> You can drop it.
> 
>>  +	.name			= "ingenic-drm",
>>  +	.desc			= "DRM module for Ingenic SoCs",
>>  +	.date			= "20190228",
>>  +	.major			= 1,
>>  +	.minor			= 0,
>>  +	.patchlevel		= 0,
>>  +
>>  +	.fops			= &ingenic_drm_fops,
>>  +
>>  +	.dumb_create		= drm_gem_cma_dumb_create,
>>  +	.gem_free_object_unlocked = drm_gem_cma_free_object,
>>  +	.gem_vm_ops		= &drm_gem_cma_vm_ops,
>>  +
>>  +	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
>>  +	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
> 
>>  +	.gem_prime_import	= drm_gem_prime_import,
>>  +	.gem_prime_export	= drm_gem_prime_export,
> The two assignments above are not needed. This is the default 
> behaviour. See drm_drv.h
> (from drm-misc-next)
> 
>>  +static int ingenic_drm_probe(struct platform_device *pdev)
>>  +{
>>  +	const struct jz_soc_info *soc_info;
>>  +	struct device *dev = &pdev->dev;
>>  +	struct ingenic_drm *priv;
>>  +	struct clk *parent_clk;
>>  +	struct drm_device *drm;
>>  +	struct resource *mem;
>>  +	void __iomem *base;
>>  +	long parent_rate;
>>  +	int ret, irq;
>>  +
>>  +	soc_info = device_get_match_data(dev);
>>  +	if (!soc_info)
>>  +		return -EINVAL;
>>  +
>>  +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
>>  +	if (!priv)
>>  +		return -ENOMEM;
>>  +
>>  +	priv->dev = dev;
>>  +
>>  +	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>  +	priv->base = base = devm_ioremap_resource(dev, mem);
>>  +	if (IS_ERR(base))
>>  +		return PTR_ERR(base);
>>  +
>>  +	irq = platform_get_irq(pdev, 0);
>>  +	if (irq < 0) {
>>  +		dev_err(dev, "Failed to get platform irq\n");
>>  +		return -ENOENT;
>>  +	}
>>  +
>>  +	priv->map = devm_regmap_init_mmio(dev, base,
>>  +					  &ingenic_drm_regmap_config);
>>  +	if (IS_ERR(priv->map)) {
>>  +		dev_err(dev, "Failed to create regmap\n");
>>  +		return PTR_ERR(priv->map);
>>  +	}
>>  +
>>  +	if (soc_info->needs_dev_clk) {
>>  +		priv->lcd_clk = devm_clk_get(dev, "lcd");
>>  +		if (IS_ERR(priv->lcd_clk)) {
>>  +			dev_err(dev, "Failed to get lcd clock\n");
>>  +			return PTR_ERR(priv->lcd_clk);
>>  +		}
>>  +	}
>>  +
>>  +	priv->pix_clk = devm_clk_get(dev, "lcd_pclk");
>>  +	if (IS_ERR(priv->pix_clk)) {
>>  +		dev_err(dev, "Failed to get pixel clock\n");
>>  +		return PTR_ERR(priv->pix_clk);
>>  +	}
>>  +
>>  +	priv->panel_node = of_parse_phandle(dev->of_node, 
>> "ingenic,panel", 0);
>>  +	if (!priv->panel_node) {
>>  +		DRM_INFO("No panel found");
>>  +	} else {
>>  +		priv->panel = of_drm_find_panel(priv->panel_node);
>>  +		of_node_put(priv->panel_node);
>>  +
>>  +		if (IS_ERR(priv->panel)) {
>>  +			if (PTR_ERR(priv->panel) == -EPROBE_DEFER)
>>  +				return -EPROBE_DEFER;
>>  +
>>  +			priv->panel = NULL;
>>  +		} else {
>>  +			ret = drm_panel_prepare(priv->panel);
>>  +			if (ret && ret != -ENOSYS)
>>  +				return ret;
>>  +		}
>>  +	}
>>  +
>>  +	if (priv->panel) {
>>  +		ret = device_property_read_u32(dev, "ingenic,lcd-mode",
>>  +					       &priv->lcd_mode);
>>  +		if (ret) {
>>  +			dev_err(dev, "Unable to read ingenic,lcd-mode property\n");
>>  +			return ret;
>>  +		}
>>  +	}
>>  +
>>  +	priv->framedesc = dma_alloc_coherent(dev, 
>> sizeof(*priv->framedesc),
>>  +					     &priv->framedesc_phys, GFP_KERNEL);
>>  +	if (!priv->framedesc)
>>  +		return -ENOMEM;
>>  +
>>  +	priv->framedesc->next = priv->framedesc_phys;
>>  +	priv->framedesc->id = 0xdeafbead;
> I did not really follow this code.
> But you have framedesc that include a next pointer which is uint32_t,
> and you assign to it framedesc_phys which is dmaaddr_t.
> This looks fishy to me, but maybe it is fine.

As explained above, the framedesc is the hardware DMA descriptor, its 
fields
must be 32-bit, that's why it's done this way.

> When browsing other drivers I see uses of for example 
> {dma,dmam}_pool_create()
> 
> When lookign at the origianl fbdev code it is obvious where this 
> comes from.
> Notice that in the fbdev code JZ_REG_LCD_DA0 register is updated in 
> the enable function.
> This is done different in this driver.
> Just an observation, what is right I dunno.

JZ_REG_LCD_DA0 should contain the address of the DMA descriptor. In 
this driver,
I create a single DMA descriptor that commands the transfer of a full 
frame.
It only has to be set once, so it could even be written in the probe 
function,
provided the clocks are enabled.

>>  +static int ingenic_drm_remove(struct platform_device *pdev)
>>  +{
>>  +	struct drm_device *drm = platform_get_drvdata(pdev);
>>  +	struct ingenic_drm *priv = drm->dev_private;
>>  +
>>  +	drm_dev_unregister(drm);
>>  +	drm_mode_config_cleanup(drm);
>>  +
>>  +	if (priv->lcd_clk)
>>  +		clk_disable_unprepare(priv->lcd_clk);
>>  +	clk_disable_unprepare(priv->pix_clk);
>>  +
>>  +	drm_vblank_cleanup(drm);
>>  +	drm_irq_uninstall(drm);
>>  +
>>  +	drm_encoder_cleanup(&priv->encoder);
>>  +	drm_connector_cleanup(&priv->connector);
>>  +	drm_crtc_cleanup(&priv->crtc);
>>  +	drm_plane_cleanup(&priv->primary);
>>  +
>>  +	drm_dev_put(drm);
>>  +
>>  +	dma_free_coherent(&pdev->dev, sizeof(*priv->framedesc),
>>  +			  priv->framedesc, priv->framedesc_phys);
>>  +
>>  +	return 0;
>>  +}
>>  +
>>  +static const struct jz_soc_info jz4740_soc_info = {
>>  +	.needs_dev_clk = true,
>>  +};
>>  +
>>  +static const struct jz_soc_info jz4725b_soc_info = {
>>  +	.needs_dev_clk = false,
>>  +};
>>  +
>>  +static const struct of_device_id ingenic_drm_of_match[] = {
>>  +	{ .compatible = "ingenic,jz4740-drm", .data = &jz4740_soc_info },
>>  +	{ .compatible = "ingenic,jz4725b-drm", .data = &jz4725b_soc_info 
>> },
>>  +	{},
> Use /* sentinel */ like in most drivers.

For this and other embedded comments I didn't directly reply: duly 
noted.

Thanks for the review.

Greetings,
-Paul

Paul Cercueil March 14, 2019, 12:36 p.m. UTC | #4

Hi Daniel,

Le ven. 1 mars 2019 à 9:26, Daniel Vetter <[e-mail]> a écrit :
> On Thu, Feb 28, 2019 at 07:07:56PM -0300, Paul Cercueil wrote:
>>  Add a KMS driver for the Ingenic JZ47xx family of SoCs.
>>  This driver is meant to replace the aging jz4740-fb driver.
>> 
>>  Signed-off-by: Paul Cercueil <[e-mail]>
>>  Tested-by: Artur Rojek <[e-mail]>
> 
> Yay, more fbdev drivers moving to atmic!
> 
> Going on vacations for a week now, so just a few quick high-level 
> comments
> below. Those should make the driver even smaller and cleaner.
> 
>>  ---
>>   drivers/gpu/drm/Kconfig               |   2 +
>>   drivers/gpu/drm/Makefile              |   1 +
>>   drivers/gpu/drm/ingenic/Kconfig       |  16 +
>>   drivers/gpu/drm/ingenic/Makefile      |   1 +
>>   drivers/gpu/drm/ingenic/ingenic-drm.c | 896 
>> ++++++++++++++++++++++++++++++++++
>>   5 files changed, 916 insertions(+)
>>   create mode 100644 drivers/gpu/drm/ingenic/Kconfig
>>   create mode 100644 drivers/gpu/drm/ingenic/Makefile
>>   create mode 100644 drivers/gpu/drm/ingenic/ingenic-drm.c
>> 
>>  diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
>>  index bd943a71756c..f1929112e559 100644
>>  --- a/drivers/gpu/drm/Kconfig
>>  +++ b/drivers/gpu/drm/Kconfig
>>  @@ -303,6 +303,8 @@ source "drivers/gpu/drm/sti/Kconfig"
>> 
>>   source "drivers/gpu/drm/imx/Kconfig"
>> 
>>  +source "drivers/gpu/drm/ingenic/Kconfig"
>>  +
>>   source "drivers/gpu/drm/v3d/Kconfig"
>> 
>>   source "drivers/gpu/drm/vc4/Kconfig"
>>  diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
>>  index 1ac55c65eac0..9666c0767f44 100644
>>  --- a/drivers/gpu/drm/Makefile
>>  +++ b/drivers/gpu/drm/Makefile
>>  @@ -94,6 +94,7 @@ obj-$(CONFIG_DRM_TEGRA) += tegra/
>>   obj-$(CONFIG_DRM_STM) += stm/
>>   obj-$(CONFIG_DRM_STI) += sti/
>>   obj-$(CONFIG_DRM_IMX) += imx/
>>  +obj-y			+= ingenic/
>>   obj-$(CONFIG_DRM_MEDIATEK) += mediatek/
>>   obj-$(CONFIG_DRM_MESON)	+= meson/
>>   obj-y			+= i2c/
>>  diff --git a/drivers/gpu/drm/ingenic/Kconfig 
>> b/drivers/gpu/drm/ingenic/Kconfig
>>  new file mode 100644
>>  index 000000000000..d82c3d37ec9c
>>  --- /dev/null
>>  +++ b/drivers/gpu/drm/ingenic/Kconfig
>>  @@ -0,0 +1,16 @@
>>  +config DRM_INGENIC
>>  +	tristate "DRM Support for Ingenic SoCs"
>>  +	depends on MIPS || COMPILE_TEST
>>  +	depends on DRM
>>  +	depends on CMA
>>  +	depends on OF
>>  +	select DRM_BRIDGE
>>  +	select DRM_PANEL_BRIDGE
>>  +	select DRM_KMS_HELPER
>>  +	select DRM_KMS_CMA_HELPER
>>  +	select DRM_GEM_CMA_HELPER
>>  +	select VT_HW_CONSOLE_BINDING if FRAMEBUFFER_CONSOLE
>>  +	help
>>  +	  Choose this option for DRM support for the Ingenic SoCs.
>>  +
>>  +	  If M is selected the module will be called ingenic-drm.
>>  diff --git a/drivers/gpu/drm/ingenic/Makefile 
>> b/drivers/gpu/drm/ingenic/Makefile
>>  new file mode 100644
>>  index 000000000000..11cac42ce0bb
>>  --- /dev/null
>>  +++ b/drivers/gpu/drm/ingenic/Makefile
>>  @@ -0,0 +1 @@
>>  +obj-$(CONFIG_DRM_INGENIC) += ingenic-drm.o
>>  diff --git a/drivers/gpu/drm/ingenic/ingenic-drm.c 
>> b/drivers/gpu/drm/ingenic/ingenic-drm.c
>>  new file mode 100644
>>  index 000000000000..18120deea96f
>>  --- /dev/null
>>  +++ b/drivers/gpu/drm/ingenic/ingenic-drm.c
>>  @@ -0,0 +1,896 @@
>>  +// SPDX-License-Identifier: GPL-2.0
>>  +//
>>  +// Ingenic JZ47xx KMS driver
>>  +//
>>  +// Copyright (C) 2019, Paul Cercueil <[e-mail]>
>>  +
>>  +#include <linux/clk.h>
>>  +#include <linux/dma-mapping.h>
>>  +#include <linux/module.h>
>>  +#include <linux/platform_device.h>
>>  +#include <linux/regmap.h>
>>  +
>>  +#include <drm/drm_atomic.h>
>>  +#include <drm/drm_atomic_helper.h>
>>  +#include <drm/drm_crtc.h>
>>  +#include <drm/drm_crtc_helper.h>
>>  +#include <drm/drm_drv.h>
>>  +#include <drm/drm_gem_cma_helper.h>
>>  +#include <drm/drm_fb_cma_helper.h>
>>  +#include <drm/drm_fb_helper.h>
>>  +#include <drm/drm_fourcc.h>
>>  +#include <drm/drm_gem_framebuffer_helper.h>
>>  +#include <drm/drm_irq.h>
>>  +#include <drm/drm_panel.h>
>>  +#include <drm/drm_plane.h>
>>  +#include <drm/drm_plane_helper.h>
>>  +#include <drm/drm_probe_helper.h>
>>  +#include <drm/drm_vblank.h>
>>  +
>>  +#include <dt-bindings/display/ingenic,drm.h>
>>  +
>>  +#include "../drm_internal.h"
>>  +
>>  +#define JZ_REG_LCD_CFG		0x00
>>  +#define JZ_REG_LCD_VSYNC	0x04
>>  +#define JZ_REG_LCD_HSYNC	0x08
>>  +#define JZ_REG_LCD_VAT		0x0C
>>  +#define JZ_REG_LCD_DAH		0x10
>>  +#define JZ_REG_LCD_DAV		0x14
>>  +#define JZ_REG_LCD_PS		0x18
>>  +#define JZ_REG_LCD_CLS		0x1C
>>  +#define JZ_REG_LCD_SPL		0x20
>>  +#define JZ_REG_LCD_REV		0x24
>>  +#define JZ_REG_LCD_CTRL		0x30
>>  +#define JZ_REG_LCD_STATE	0x34
>>  +#define JZ_REG_LCD_IID		0x38
>>  +#define JZ_REG_LCD_DA0		0x40
>>  +#define JZ_REG_LCD_SA0		0x44
>>  +#define JZ_REG_LCD_FID0		0x48
>>  +#define JZ_REG_LCD_CMD0		0x4C
>>  +#define JZ_REG_LCD_DA1		0x50
>>  +#define JZ_REG_LCD_SA1		0x54
>>  +#define JZ_REG_LCD_FID1		0x58
>>  +#define JZ_REG_LCD_CMD1		0x5C
>>  +
>>  +#define JZ_LCD_CFG_SLCD			BIT(31)
>>  +#define JZ_LCD_CFG_PS_DISABLE		BIT(23)
>>  +#define JZ_LCD_CFG_CLS_DISABLE		BIT(22)
>>  +#define JZ_LCD_CFG_SPL_DISABLE		BIT(21)
>>  +#define JZ_LCD_CFG_REV_DISABLE		BIT(20)
>>  +#define JZ_LCD_CFG_HSYNCM		BIT(19)
>>  +#define JZ_LCD_CFG_PCLKM		BIT(18)
>>  +#define JZ_LCD_CFG_INV			BIT(17)
>>  +#define JZ_LCD_CFG_SYNC_DIR		BIT(16)
>>  +#define JZ_LCD_CFG_PS_POLARITY		BIT(15)
>>  +#define JZ_LCD_CFG_CLS_POLARITY		BIT(14)
>>  +#define JZ_LCD_CFG_SPL_POLARITY		BIT(13)
>>  +#define JZ_LCD_CFG_REV_POLARITY		BIT(12)
>>  +#define JZ_LCD_CFG_HSYNC_ACTIVE_LOW	BIT(11)
>>  +#define JZ_LCD_CFG_PCLK_FALLING_EDGE	BIT(10)
>>  +#define JZ_LCD_CFG_DE_ACTIVE_LOW	BIT(9)
>>  +#define JZ_LCD_CFG_VSYNC_ACTIVE_LOW	BIT(8)
>>  +#define JZ_LCD_CFG_18_BIT		BIT(7)
>>  +#define JZ_LCD_CFG_PDW			(BIT(5) | BIT(4))
>>  +#define JZ_LCD_CFG_MODE_MASK		0xf
>>  +
>>  +#define JZ_LCD_VSYNC_VPS_OFFSET		16
>>  +#define JZ_LCD_VSYNC_VPE_OFFSET		0
>>  +
>>  +#define JZ_LCD_HSYNC_HPS_OFFSET		16
>>  +#define JZ_LCD_HSYNC_HPE_OFFSET		0
>>  +
>>  +#define JZ_LCD_VAT_HT_OFFSET		16
>>  +#define JZ_LCD_VAT_VT_OFFSET		0
>>  +
>>  +#define JZ_LCD_DAH_HDS_OFFSET		16
>>  +#define JZ_LCD_DAH_HDE_OFFSET		0
>>  +
>>  +#define JZ_LCD_DAV_VDS_OFFSET		16
>>  +#define JZ_LCD_DAV_VDE_OFFSET		0
>>  +
>>  +#define JZ_LCD_CTRL_BURST_4		(0x0 << 28)
>>  +#define JZ_LCD_CTRL_BURST_8		(0x1 << 28)
>>  +#define JZ_LCD_CTRL_BURST_16		(0x2 << 28)
>>  +#define JZ_LCD_CTRL_RGB555		BIT(27)
>>  +#define JZ_LCD_CTRL_OFUP		BIT(26)
>>  +#define JZ_LCD_CTRL_FRC_GRAYSCALE_16	(0x0 << 24)
>>  +#define JZ_LCD_CTRL_FRC_GRAYSCALE_4	(0x1 << 24)
>>  +#define JZ_LCD_CTRL_FRC_GRAYSCALE_2	(0x2 << 24)
>>  +#define JZ_LCD_CTRL_PDD_MASK		(0xff << 16)
>>  +#define JZ_LCD_CTRL_EOF_IRQ		BIT(13)
>>  +#define JZ_LCD_CTRL_SOF_IRQ		BIT(12)
>>  +#define JZ_LCD_CTRL_OFU_IRQ		BIT(11)
>>  +#define JZ_LCD_CTRL_IFU0_IRQ		BIT(10)
>>  +#define JZ_LCD_CTRL_IFU1_IRQ		BIT(9)
>>  +#define JZ_LCD_CTRL_DD_IRQ		BIT(8)
>>  +#define JZ_LCD_CTRL_QDD_IRQ		BIT(7)
>>  +#define JZ_LCD_CTRL_REVERSE_ENDIAN	BIT(6)
>>  +#define JZ_LCD_CTRL_LSB_FISRT		BIT(5)
>>  +#define JZ_LCD_CTRL_DISABLE		BIT(4)
>>  +#define JZ_LCD_CTRL_ENABLE		BIT(3)
>>  +#define JZ_LCD_CTRL_BPP_1		0x0
>>  +#define JZ_LCD_CTRL_BPP_2		0x1
>>  +#define JZ_LCD_CTRL_BPP_4		0x2
>>  +#define JZ_LCD_CTRL_BPP_8		0x3
>>  +#define JZ_LCD_CTRL_BPP_15_16		0x4
>>  +#define JZ_LCD_CTRL_BPP_18_24		0x5
>>  +#define JZ_LCD_CTRL_BPP_MASK		(JZ_LCD_CTRL_RGB555 | (0x7 << 0))
>>  +
>>  +#define JZ_LCD_CMD_SOF_IRQ		BIT(31)
>>  +#define JZ_LCD_CMD_EOF_IRQ		BIT(30)
>>  +#define JZ_LCD_CMD_ENABLE_PAL		BIT(28)
>>  +
>>  +#define JZ_LCD_SYNC_MASK		0x3ff
>>  +
>>  +#define JZ_LCD_STATE_EOF_IRQ		BIT(5)
>>  +#define JZ_LCD_STATE_SOF_IRQ		BIT(4)
>>  +#define JZ_LCD_STATE_DISABLED		BIT(0)
>>  +
>>  +struct ingenic_framedesc {
>>  +	uint32_t next;
>>  +	uint32_t addr;
>>  +	uint32_t id;
>>  +	uint32_t cmd;
>>  +} __packed;
>>  +
>>  +struct jz_soc_info {
>>  +	bool needs_dev_clk;
>>  +};
>>  +
>>  +struct ingenic_drm {
>>  +	struct device *dev;
> 
> Embedding is kinda the new thing, since it also prevents people from 
> using
> devm_ for this, which is (strictly speaking, not that it matters 
> much) the
> wrong lifetime for drm allocations. There's some patches from Noralf 
> that
> should land soon to make this a bit more convenient.
> 
>>  +	void __iomem *base;
>>  +	struct regmap *map;
>>  +	struct clk *lcd_clk, *pix_clk;
>>  +
>>  +	u32 lcd_mode;
>>  +
>>  +	struct ingenic_framedesc *framedesc;
>>  +	dma_addr_t framedesc_phys;
>>  +
>>  +	struct drm_device *drm;
>>  +	struct drm_plane primary;
>>  +	struct drm_crtc crtc;
>>  +	struct drm_connector connector;
>>  +	struct drm_encoder encoder;
> 
> Any reason you didn't opt for the drm_simple_display_pipe helpers? 
> Since
> you have just 1:1:1 between crtc/plane/encoder that will allow you to
> ditch lots of boilerplate.
> 
> https://dri.freedesktop.org/docs/drm/gpu/drm-kms-helpers.html#simple-kms-helper-reference
> 
>>  +	struct drm_panel *panel;
>>  +
>>  +	struct device_node *panel_node;
> 
> There's panel bridge helpers which takes a panel and wraps it into a
> drm_bridge (which you can glue into the simple pipe helpers), giving 
> you
> the connector for free.
> 
> https://dri.freedesktop.org/docs/drm/gpu/drm-kms-helpers.html#panel-bridge-helper-reference

I'm having some trouble using this; if I use a drm_bridge and attach it
directly to the encoder, how can I get a pointer to the drm_connector?
I need it to retrieve the connector->display_info.bus_flags.

Thanks,
-Paul

> This should cover all the bigger items, details look already really 
> tidy.
> 
> Cheers, Daniel
> 
>>  +
>>  +	unsigned short ps_start, ps_end, cls_start,
>>  +		       cls_end, spl_start, spl_end, rev_start;
>>  +};
>>  +
>>  +static const uint32_t ingenic_drm_primary_formats[] = {
>>  +	DRM_FORMAT_XRGB1555,
>>  +	DRM_FORMAT_RGB565,
>>  +	DRM_FORMAT_XRGB8888,
>>  +};
>>  +
>>  +static bool ingenic_drm_writeable_reg(struct device *dev, unsigned 
>> int reg)
>>  +{
>>  +	switch (reg) {
>>  +	case JZ_REG_LCD_IID:
>>  +	case JZ_REG_LCD_SA0:
>>  +	case JZ_REG_LCD_FID0:
>>  +	case JZ_REG_LCD_CMD0:
>>  +	case JZ_REG_LCD_SA1:
>>  +	case JZ_REG_LCD_FID1:
>>  +	case JZ_REG_LCD_CMD1:
>>  +		return false;
>>  +	default:
>>  +		return true;
>>  +	}
>>  +}
>>  +
>>  +static const struct regmap_config ingenic_drm_regmap_config = {
>>  +	.reg_bits = 32,
>>  +	.val_bits = 32,
>>  +	.reg_stride = 4,
>>  +
>>  +	.max_register = JZ_REG_LCD_CMD1,
>>  +	.writeable_reg = ingenic_drm_writeable_reg,
>>  +};
>>  +
>>  +static inline struct ingenic_drm *drm_crtc_get_priv(struct 
>> drm_crtc *crtc)
>>  +{
>>  +	return container_of(crtc, struct ingenic_drm, crtc);
>>  +}
>>  +
>>  +static inline struct ingenic_drm *drm_plane_get_priv(struct 
>> drm_plane *plane)
>>  +{
>>  +	return container_of(plane, struct ingenic_drm, primary);
>>  +}
>>  +
>>  +static inline struct ingenic_drm *drm_conn_get_priv(struct 
>> drm_connector *conn)
>>  +{
>>  +	return container_of(conn, struct ingenic_drm, connector);
>>  +}
>>  +
>>  +static void ingenic_drm_crtc_atomic_enable(struct drm_crtc *crtc,
>>  +					  struct drm_crtc_state *state)
>>  +{
>>  +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
>>  +
>>  +	regmap_write(priv->map, JZ_REG_LCD_STATE, 0);
>>  +
>>  +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
>>  +			   JZ_LCD_CTRL_ENABLE | JZ_LCD_CTRL_DISABLE,
>>  +			   JZ_LCD_CTRL_ENABLE);
>>  +
>>  +	drm_panel_enable(priv->panel);
>>  +
>>  +	drm_crtc_vblank_on(crtc);
>>  +}
>>  +
>>  +static void ingenic_drm_crtc_atomic_disable(struct drm_crtc *crtc,
>>  +					   struct drm_crtc_state *state)
>>  +{
>>  +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
>>  +	unsigned int var;
>>  +
>>  +	drm_crtc_vblank_off(crtc);
>>  +
>>  +	drm_panel_disable(priv->panel);
>>  +
>>  +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
>>  +			   JZ_LCD_CTRL_DISABLE, JZ_LCD_CTRL_DISABLE);
>>  +
>>  +	regmap_read_poll_timeout(priv->map, JZ_REG_LCD_STATE, var,
>>  +				 var & JZ_LCD_STATE_DISABLED,
>>  +				 1000, 0);
>>  +}
>>  +
>>  +static inline bool ingenic_drm_lcd_is_special_mode(u32 mode)
>>  +{
>>  +	switch (mode) {
>>  +	case JZ_DRM_LCD_SPECIAL_TFT_1:
>>  +	case JZ_DRM_LCD_SPECIAL_TFT_2:
>>  +	case JZ_DRM_LCD_SPECIAL_TFT_3:
>>  +		return true;
>>  +	default:
>>  +		return false;
>>  +	}
>>  +}
>>  +
>>  +static inline bool ingenic_drm_lcd_is_stn_mode(u32 mode)
>>  +{
>>  +	switch (mode) {
>>  +	case JZ_DRM_LCD_SINGLE_COLOR_STN:
>>  +	case JZ_DRM_LCD_SINGLE_MONOCHROME_STN:
>>  +	case JZ_DRM_LCD_DUAL_COLOR_STN:
>>  +	case JZ_DRM_LCD_DUAL_MONOCHROME_STN:
>>  +		return true;
>>  +	default:
>>  +		return false;
>>  +	}
>>  +}
>>  +
>>  +static void ingenic_drm_crtc_update_timings(struct ingenic_drm 
>> *priv,
>>  +					    struct drm_display_mode *mode)
>>  +{
>>  +	unsigned int vpe, vds, vde, vt, hpe, hds, hde, ht;
>>  +
>>  +	vpe = mode->vsync_end - mode->vsync_start;
>>  +	vds = mode->vtotal - mode->vsync_start;
>>  +	vde = vds + mode->vdisplay;
>>  +	vt = vde + mode->vsync_start - mode->vdisplay;
>>  +
>>  +	hpe = mode->hsync_end - mode->hsync_start;
>>  +	hds = mode->htotal - mode->hsync_start;
>>  +	hde = hds + mode->hdisplay;
>>  +	ht = hde + mode->hsync_start - mode->hdisplay;
>>  +
>>  +	regmap_write(priv->map, JZ_REG_LCD_VSYNC,
>>  +		     0 << JZ_LCD_VSYNC_VPS_OFFSET |
>>  +		     vpe << JZ_LCD_VSYNC_VPE_OFFSET);
>>  +
>>  +	regmap_write(priv->map, JZ_REG_LCD_HSYNC,
>>  +		     0 << JZ_LCD_HSYNC_HPS_OFFSET |
>>  +		     hpe << JZ_LCD_HSYNC_HPE_OFFSET);
>>  +
>>  +	regmap_write(priv->map, JZ_REG_LCD_VAT,
>>  +		     ht << JZ_LCD_VAT_HT_OFFSET |
>>  +		     vt << JZ_LCD_VAT_VT_OFFSET);
>>  +
>>  +	regmap_write(priv->map, JZ_REG_LCD_DAH,
>>  +		     hds << JZ_LCD_DAH_HDS_OFFSET |
>>  +		     hde << JZ_LCD_DAH_HDE_OFFSET);
>>  +	regmap_write(priv->map, JZ_REG_LCD_DAV,
>>  +		     vds << JZ_LCD_DAV_VDS_OFFSET |
>>  +		     vde << JZ_LCD_DAV_VDE_OFFSET);
>>  +
>>  +	if (ingenic_drm_lcd_is_special_mode(priv->lcd_mode)) {
>>  +		regmap_write(priv->map, JZ_REG_LCD_PS, hde << 16 | (hde + 1));
>>  +		regmap_write(priv->map, JZ_REG_LCD_CLS, hde << 16 | (hde + 1));
>>  +		regmap_write(priv->map, JZ_REG_LCD_SPL, hpe << 16 | (hpe + 1));
>>  +		regmap_write(priv->map, JZ_REG_LCD_REV, mode->htotal << 16);
>>  +	}
>>  +}
>>  +
>>  +static void ingenic_drm_crtc_update_cfg(struct ingenic_drm *priv,
>>  +					struct drm_display_mode *mode)
>>  +
>>  +{
>>  +	unsigned int cfg = priv->lcd_mode;
>>  +	u32 bus_flags = priv->connector.display_info.bus_flags;
>>  +
>>  +	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
>>  +		cfg |= JZ_LCD_CFG_HSYNC_ACTIVE_LOW;
>>  +	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
>>  +		cfg |= JZ_LCD_CFG_VSYNC_ACTIVE_LOW;
>>  +	if (bus_flags & DRM_BUS_FLAG_DE_LOW)
>>  +		cfg |= JZ_LCD_CFG_DE_ACTIVE_LOW;
>>  +	if (bus_flags & DRM_BUS_FLAG_PIXDATA_NEGEDGE)
>>  +		cfg |= JZ_LCD_CFG_PCLK_FALLING_EDGE;
>>  +
>>  +	if (ingenic_drm_lcd_is_special_mode(priv->lcd_mode)) {
>>  +		// TODO: Is that valid for all special modes?
>>  +		cfg |= JZ_LCD_CFG_REV_POLARITY;
>>  +	} else {
>>  +		cfg |= JZ_LCD_CFG_PS_DISABLE
>>  +		    | JZ_LCD_CFG_CLS_DISABLE
>>  +		    | JZ_LCD_CFG_SPL_DISABLE
>>  +		    | JZ_LCD_CFG_REV_DISABLE;
>>  +	}
>>  +
>>  +	regmap_write(priv->map, JZ_REG_LCD_CFG, cfg);
>>  +}
>>  +
>>  +static void ingenic_drm_crtc_update_ctrl(struct ingenic_drm *priv,
>>  +					 unsigned int bpp)
>>  +{
>>  +	unsigned int ctrl = JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16;
>>  +
>>  +	switch (bpp) {
>>  +	case 1:
>>  +		ctrl |= JZ_LCD_CTRL_BPP_1;
>>  +		break;
>>  +	case 2:
>>  +		ctrl |= JZ_LCD_CTRL_BPP_2;
>>  +		break;
>>  +	case 4:
>>  +		ctrl |= JZ_LCD_CTRL_BPP_4;
>>  +		break;
>>  +	case 8:
>>  +		ctrl |= JZ_LCD_CTRL_BPP_8;
>>  +	break;
>>  +	case 15:
>>  +		ctrl |= JZ_LCD_CTRL_RGB555; /* Falltrough */
>>  +	case 16:
>>  +		ctrl |= JZ_LCD_CTRL_BPP_15_16;
>>  +		break;
>>  +	case 18:
>>  +	case 24:
>>  +	case 32:
>>  +		ctrl |= JZ_LCD_CTRL_BPP_18_24;
>>  +		break;
>>  +	default:
>>  +		break;
>>  +	}
>>  +
>>  +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
>>  +			   JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16 |
>>  +			   JZ_LCD_CTRL_BPP_MASK, ctrl);
>>  +}
>>  +
>>  +static int ingenic_drm_crtc_atomic_check(struct drm_crtc *crtc,
>>  +					 struct drm_crtc_state *state)
>>  +{
>>  +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
>>  +	long rate;
>>  +
>>  +	if (!drm_atomic_crtc_needs_modeset(state))
>>  +		return 0;
>>  +
>>  +	rate = clk_round_rate(priv->pix_clk,
>>  +			      state->adjusted_mode.clock * 1000);
>>  +	if (rate < 0)
>>  +		return rate;
>>  +
>>  +	return 0;
>>  +}
>>  +
>>  +static void ingenic_drm_crtc_atomic_flush(struct drm_crtc *crtc,
>>  +					  struct drm_crtc_state *oldstate)
>>  +{
>>  +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
>>  +	struct drm_crtc_state *state = crtc->state;
>>  +	struct drm_pending_vblank_event *event = state->event;
>>  +	struct drm_framebuffer *drm_fb = crtc->primary->state->fb;
>>  +	const struct drm_format_info *finfo;
>>  +	unsigned int width, height;
>>  +
>>  +	if (drm_atomic_crtc_needs_modeset(state)) {
>>  +		finfo = drm_format_info(drm_fb->format->format);
>>  +		width = state->adjusted_mode.hdisplay;
>>  +		height = state->adjusted_mode.vdisplay;
>>  +
>>  +		ingenic_drm_crtc_update_timings(priv, &state->mode);
>>  +
>>  +		ingenic_drm_crtc_update_ctrl(priv, finfo->depth);
>>  +		ingenic_drm_crtc_update_cfg(priv, &state->adjusted_mode);
>>  +
>>  +		clk_set_rate(priv->pix_clk, state->adjusted_mode.clock * 1000);
>>  +
>>  +		regmap_write(priv->map, JZ_REG_LCD_DA0, priv->framedesc->next);
>>  +	}
>>  +
>>  +	if (event) {
>>  +		state->event = NULL;
>>  +
>>  +		spin_lock_irq(&crtc->dev->event_lock);
>>  +		if (drm_crtc_vblank_get(crtc) == 0)
>>  +			drm_crtc_arm_vblank_event(crtc, event);
>>  +		else
>>  +			drm_crtc_send_vblank_event(crtc, event);
>>  +		spin_unlock_irq(&crtc->dev->event_lock);
>>  +	}
>>  +}
>>  +
>>  +static void ingenic_drm_plane_atomic_update(struct drm_plane 
>> *plane,
>>  +					    struct drm_plane_state *oldstate)
>>  +{
>>  +	struct ingenic_drm *priv = drm_plane_get_priv(plane);
>>  +	struct drm_plane_state *state = plane->state;
>>  +	const struct drm_format_info *finfo;
>>  +	unsigned int width, height;
>>  +
>>  +	finfo = drm_format_info(state->fb->format->format);
>>  +	width = state->crtc->state->adjusted_mode.hdisplay;
>>  +	height = state->crtc->state->adjusted_mode.vdisplay;
>>  +
>>  +	priv->framedesc->addr = drm_fb_cma_get_gem_addr(state->fb, state, 
>> 0);
>>  +
>>  +	priv->framedesc->cmd = width * height * ((finfo->depth + 7) / 8) 
>> / 4;
>>  +	priv->framedesc->cmd |= JZ_LCD_CMD_EOF_IRQ;
>>  +}
>>  +
>>  +static enum drm_connector_status
>>  +ingenic_drm_conn_detect(struct drm_connector *conn, bool force)
>>  +{
>>  +	struct ingenic_drm *priv = drm_conn_get_priv(conn);
>>  +
>>  +	if (priv->panel) {
>>  +		drm_panel_attach(priv->panel, conn);
>>  +
>>  +		return connector_status_connected;
>>  +	}
>>  +
>>  +	return connector_status_disconnected;
>>  +}
>>  +
>>  +static void ingenic_drm_conn_destroy(struct drm_connector *conn)
>>  +{
>>  +	struct ingenic_drm *priv = drm_conn_get_priv(conn);
>>  +
>>  +	if (priv->panel)
>>  +		drm_panel_detach(priv->panel);
>>  +
>>  +	drm_connector_cleanup(conn);
>>  +}
>>  +
>>  +static int ingenic_drm_conn_get_modes(struct drm_connector *conn)
>>  +{
>>  +	struct ingenic_drm *priv = drm_conn_get_priv(conn);
>>  +
>>  +	if (priv->panel)
>>  +		return priv->panel->funcs->get_modes(priv->panel);
>>  +
>>  +	return 0;
>>  +}
>>  +
>>  +static irqreturn_t ingenic_drm_irq_handler(int irq, void *arg)
>>  +{
>>  +	struct drm_device *drm = arg;
>>  +	struct ingenic_drm *priv = drm->dev_private;
>>  +	unsigned int state;
>>  +
>>  +	regmap_read(priv->map, JZ_REG_LCD_STATE, &state);
>>  +
>>  +	regmap_update_bits(priv->map, JZ_REG_LCD_STATE,
>>  +			   JZ_LCD_STATE_EOF_IRQ, 0);
>>  +
>>  +	if (state & JZ_LCD_STATE_EOF_IRQ)
>>  +		drm_crtc_handle_vblank(&priv->crtc);
>>  +
>>  +	return IRQ_HANDLED;
>>  +}
>>  +
>>  +static int ingenic_drm_enable_vblank(struct drm_crtc *crtc)
>>  +{
>>  +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
>>  +
>>  +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
>>  +			   JZ_LCD_CTRL_EOF_IRQ, JZ_LCD_CTRL_EOF_IRQ);
>>  +
>>  +	return 0;
>>  +}
>>  +
>>  +static void ingenic_drm_disable_vblank(struct drm_crtc *crtc)
>>  +{
>>  +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
>>  +
>>  +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL, 
>> JZ_LCD_CTRL_EOF_IRQ, 0);
>>  +}
>>  +
>>  +DEFINE_DRM_GEM_CMA_FOPS(ingenic_drm_fops);
>>  +
>>  +static struct drm_driver ingenic_drm_driver_data = {
>>  +	.driver_features	= DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME
>>  +				| DRIVER_ATOMIC | DRIVER_HAVE_IRQ,
>>  +	.name			= "ingenic-drm",
>>  +	.desc			= "DRM module for Ingenic SoCs",
>>  +	.date			= "20190228",
>>  +	.major			= 1,
>>  +	.minor			= 0,
>>  +	.patchlevel		= 0,
>>  +
>>  +	.fops			= &ingenic_drm_fops,
>>  +
>>  +	.dumb_create		= drm_gem_cma_dumb_create,
>>  +	.gem_free_object_unlocked = drm_gem_cma_free_object,
>>  +	.gem_vm_ops		= &drm_gem_cma_vm_ops,
>>  +
>>  +	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
>>  +	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
>>  +	.gem_prime_import	= drm_gem_prime_import,
>>  +	.gem_prime_export	= drm_gem_prime_export,
>>  +	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
>>  +	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
>>  +	.gem_prime_vmap		= drm_gem_cma_prime_vmap,
>>  +	.gem_prime_vunmap	= drm_gem_cma_prime_vunmap,
>>  +	.gem_prime_mmap		= drm_gem_cma_prime_mmap,
>>  +
>>  +	.irq_handler		= ingenic_drm_irq_handler,
>>  +};
>>  +
>>  +static const struct drm_plane_funcs 
>> ingenic_drm_primary_plane_funcs = {
>>  +	.update_plane		= drm_atomic_helper_update_plane,
>>  +	.disable_plane		= drm_atomic_helper_disable_plane,
>>  +	.reset			= drm_atomic_helper_plane_reset,
>>  +
>>  +	.atomic_duplicate_state	= drm_atomic_helper_plane_duplicate_state,
>>  +	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
>>  +};
>>  +
>>  +static const struct drm_crtc_funcs ingenic_drm_crtc_funcs = {
>>  +	.reset			= drm_atomic_helper_crtc_reset,
>>  +	.set_config		= drm_atomic_helper_set_config,
>>  +	.page_flip		= drm_atomic_helper_page_flip,
>>  +
>>  +	.atomic_duplicate_state	= drm_atomic_helper_crtc_duplicate_state,
>>  +	.atomic_destroy_state	= drm_atomic_helper_crtc_destroy_state,
>>  +
>>  +	.enable_vblank		= ingenic_drm_enable_vblank,
>>  +	.disable_vblank		= ingenic_drm_disable_vblank,
>>  +
>>  +	.gamma_set		= drm_atomic_helper_legacy_gamma_set,
>>  +};
>>  +
>>  +static const struct drm_connector_funcs ingenic_drm_conn_funcs = {
>>  +	.fill_modes		= drm_helper_probe_single_connector_modes,
>>  +	.detect			= ingenic_drm_conn_detect,
>>  +	.destroy		= ingenic_drm_conn_destroy,
>>  +	.reset			= drm_atomic_helper_connector_reset,
>>  +	.atomic_duplicate_state	= 
>> drm_atomic_helper_connector_duplicate_state,
>>  +	.atomic_destroy_state	= drm_atomic_helper_connector_destroy_state,
>>  +};
>>  +
>>  +static const struct drm_plane_helper_funcs 
>> ingenic_drm_plane_helper_funcs = {
>>  +	.atomic_update		= ingenic_drm_plane_atomic_update,
>>  +	.prepare_fb		= drm_gem_fb_prepare_fb,
>>  +};
>>  +
>>  +static const struct drm_crtc_helper_funcs 
>> ingenic_drm_crtc_helper_funcs = {
>>  +	.atomic_enable		= ingenic_drm_crtc_atomic_enable,
>>  +	.atomic_disable		= ingenic_drm_crtc_atomic_disable,
>>  +	.atomic_flush		= ingenic_drm_crtc_atomic_flush,
>>  +	.atomic_check		= ingenic_drm_crtc_atomic_check,
>>  +};
>>  +
>>  +static const struct drm_connector_helper_funcs 
>> ingenic_drm_conn_helper_funcs = {
>>  +	.get_modes		= ingenic_drm_conn_get_modes,
>>  +};
>>  +
>>  +static const struct drm_mode_config_funcs 
>> ingenic_drm_mode_config_funcs = {
>>  +	.fb_create		= drm_gem_fb_create,
>>  +	.output_poll_changed	= drm_fb_helper_output_poll_changed,
>>  +	.atomic_check		= drm_atomic_helper_check,
>>  +	.atomic_commit		= drm_atomic_helper_commit,
>>  +};
>>  +
>>  +static const struct drm_encoder_funcs ingenic_drm_encoder_funcs = {
>>  +	.destroy		= drm_encoder_cleanup,
>>  +};
>>  +
>>  +static int ingenic_drm_probe(struct platform_device *pdev)
>>  +{
>>  +	const struct jz_soc_info *soc_info;
>>  +	struct device *dev = &pdev->dev;
>>  +	struct ingenic_drm *priv;
>>  +	struct clk *parent_clk;
>>  +	struct drm_device *drm;
>>  +	struct resource *mem;
>>  +	void __iomem *base;
>>  +	long parent_rate;
>>  +	int ret, irq;
>>  +
>>  +	soc_info = device_get_match_data(dev);
>>  +	if (!soc_info)
>>  +		return -EINVAL;
>>  +
>>  +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
>>  +	if (!priv)
>>  +		return -ENOMEM;
>>  +
>>  +	priv->dev = dev;
>>  +
>>  +	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>  +	priv->base = base = devm_ioremap_resource(dev, mem);
>>  +	if (IS_ERR(base))
>>  +		return PTR_ERR(base);
>>  +
>>  +	irq = platform_get_irq(pdev, 0);
>>  +	if (irq < 0) {
>>  +		dev_err(dev, "Failed to get platform irq\n");
>>  +		return -ENOENT;
>>  +	}
>>  +
>>  +	priv->map = devm_regmap_init_mmio(dev, base,
>>  +					  &ingenic_drm_regmap_config);
>>  +	if (IS_ERR(priv->map)) {
>>  +		dev_err(dev, "Failed to create regmap\n");
>>  +		return PTR_ERR(priv->map);
>>  +	}
>>  +
>>  +	if (soc_info->needs_dev_clk) {
>>  +		priv->lcd_clk = devm_clk_get(dev, "lcd");
>>  +		if (IS_ERR(priv->lcd_clk)) {
>>  +			dev_err(dev, "Failed to get lcd clock\n");
>>  +			return PTR_ERR(priv->lcd_clk);
>>  +		}
>>  +	}
>>  +
>>  +	priv->pix_clk = devm_clk_get(dev, "lcd_pclk");
>>  +	if (IS_ERR(priv->pix_clk)) {
>>  +		dev_err(dev, "Failed to get pixel clock\n");
>>  +		return PTR_ERR(priv->pix_clk);
>>  +	}
>>  +
>>  +	priv->panel_node = of_parse_phandle(dev->of_node, 
>> "ingenic,panel", 0);
>>  +	if (!priv->panel_node) {
>>  +		DRM_INFO("No panel found");
>>  +	} else {
>>  +		priv->panel = of_drm_find_panel(priv->panel_node);
>>  +		of_node_put(priv->panel_node);
>>  +
>>  +		if (IS_ERR(priv->panel)) {
>>  +			if (PTR_ERR(priv->panel) == -EPROBE_DEFER)
>>  +				return -EPROBE_DEFER;
>>  +
>>  +			priv->panel = NULL;
>>  +		} else {
>>  +			ret = drm_panel_prepare(priv->panel);
>>  +			if (ret && ret != -ENOSYS)
>>  +				return ret;
>>  +		}
>>  +	}
>>  +
>>  +	if (priv->panel) {
>>  +		ret = device_property_read_u32(dev, "ingenic,lcd-mode",
>>  +					       &priv->lcd_mode);
>>  +		if (ret) {
>>  +			dev_err(dev, "Unable to read ingenic,lcd-mode property\n");
>>  +			return ret;
>>  +		}
>>  +	}
>>  +
>>  +	priv->framedesc = dma_alloc_coherent(dev, 
>> sizeof(*priv->framedesc),
>>  +					     &priv->framedesc_phys, GFP_KERNEL);
>>  +	if (!priv->framedesc)
>>  +		return -ENOMEM;
>>  +
>>  +	priv->framedesc->next = priv->framedesc_phys;
>>  +	priv->framedesc->id = 0xdeafbead;
>>  +
>>  +	drm = drm_dev_alloc(&ingenic_drm_driver_data, dev);
>>  +	if (IS_ERR(drm)) {
>>  +		ret = PTR_ERR(drm);
>>  +		goto err_free_dma;
>>  +	}
>>  +
>>  +	priv->drm = drm;
>>  +
>>  +	drm_mode_config_init(drm);
>>  +	drm->mode_config.min_width = 0;
>>  +	drm->mode_config.min_height = 0;
>>  +	drm->mode_config.max_width = 800;
>>  +	drm->mode_config.max_height = 600;
>>  +	drm->mode_config.funcs = &ingenic_drm_mode_config_funcs;
>>  +
>>  +	drm_plane_helper_add(&priv->primary, 
>> &ingenic_drm_plane_helper_funcs);
>>  +
>>  +	ret = drm_universal_plane_init(drm, &priv->primary,
>>  +				       0, &ingenic_drm_primary_plane_funcs,
>>  +				       ingenic_drm_primary_formats,
>>  +				       ARRAY_SIZE(ingenic_drm_primary_formats),
>>  +				       NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
>>  +	if (ret) {
>>  +		dev_err(dev, "Failed to register primary plane: %i\n", ret);
>>  +		goto err_unref_drm;
>>  +	}
>>  +
>>  +	drm_crtc_helper_add(&priv->crtc, &ingenic_drm_crtc_helper_funcs);
>>  +
>>  +	ret = drm_crtc_init_with_planes(drm, &priv->crtc, &priv->primary,
>>  +					NULL, &ingenic_drm_crtc_funcs, NULL);
>>  +	if (ret) {
>>  +		dev_err(dev, "Failed to init CRTC: %i\n", ret);
>>  +		goto err_cleanup_plane;
>>  +	}
>>  +
>>  +	drm_connector_helper_add(&priv->connector,
>>  +				 &ingenic_drm_conn_helper_funcs);
>>  +	ret = drm_connector_init(drm, &priv->connector,
>>  +				 &ingenic_drm_conn_funcs,
>>  +				 DRM_MODE_CONNECTOR_Unknown);
>>  +	if (ret) {
>>  +		dev_err(dev, "Failed to init connector: %i\n", ret);
>>  +		goto err_cleanup_crtc;
>>  +	}
>>  +
>>  +	priv->encoder.possible_crtcs = 1;
>>  +
>>  +	ret = drm_encoder_init(drm, &priv->encoder, 
>> &ingenic_drm_encoder_funcs,
>>  +			       DRM_MODE_ENCODER_NONE, NULL);
>>  +	if (ret) {
>>  +		dev_err(dev, "Failed to init encoder: %i\n", ret);
>>  +		goto err_cleanup_connector;
>>  +	}
>>  +
>>  +	drm_connector_attach_encoder(&priv->connector, &priv->encoder);
>>  +
>>  +	platform_set_drvdata(pdev, drm);
>>  +	priv->drm = drm;
>>  +	drm->dev_private = priv;
>>  +
>>  +	ret = drm_irq_install(drm, irq);
>>  +	if (ret) {
>>  +		dev_err(dev, "Unable to install IRQ handler\n");
>>  +		goto err_cleanup_encoder;
>>  +	}
>>  +
>>  +	ret = drm_vblank_init(drm, 1);
>>  +	if (ret) {
>>  +		dev_err(dev, "Failed calling drm_vblank_init()\n");
>>  +		goto err_uninstall_irq;
>>  +	}
>>  +
>>  +	drm_mode_config_reset(drm);
>>  +
>>  +	ret = clk_prepare_enable(priv->pix_clk);
>>  +	if (ret) {
>>  +		dev_err(dev, "Unable to start pixel clock\n");
>>  +		goto err_cleanup_vblank;
>>  +	}
>>  +
>>  +	if (priv->lcd_clk) {
>>  +		parent_clk = clk_get_parent(priv->lcd_clk);
>>  +		parent_rate = clk_get_rate(parent_clk);
>>  +
>>  +		/* LCD Device clock must be 3x the pixel clock for STN panels,
>>  +		 * or 1.5x the pixel clock for TFT panels. To avoid having to
>>  +		 * check for the LCD device clock everytime we do a mode change,
>>  +		 * we set the LCD device clock to the highest rate possible.
>>  +		 */
>>  +		ret = clk_set_rate(priv->lcd_clk, parent_rate);
>>  +		if (ret) {
>>  +			dev_err(dev, "Unable to set LCD clock rate\n");
>>  +			goto err_pixclk_disable;
>>  +		}
>>  +
>>  +		ret = clk_prepare_enable(priv->lcd_clk);
>>  +		if (ret) {
>>  +			dev_err(dev, "Unable to start lcd clock\n");
>>  +			goto err_pixclk_disable;
>>  +		}
>>  +	}
>>  +
>>  +	ret = drm_fbdev_generic_setup(drm, 16);
>>  +	if (ret) {
>>  +		dev_err(dev, "Failed to init fbdev\n");
>>  +		goto err_devclk_disable;
>>  +	}
>>  +
>>  +	ret = drm_dev_register(drm, 0);
>>  +	if (ret) {
>>  +		dev_err(dev, "Failed to register DRM driver\n");
>>  +		goto err_cleanup_fbdev;
>>  +	}
>>  +
>>  +	return 0;
>>  +
>>  +err_cleanup_fbdev:
>>  +	drm_mode_config_cleanup(drm);
>>  +err_devclk_disable:
>>  +	if (priv->lcd_clk)
>>  +		clk_disable_unprepare(priv->lcd_clk);
>>  +err_pixclk_disable:
>>  +	clk_disable_unprepare(priv->pix_clk);
>>  +err_cleanup_vblank:
>>  +	drm_vblank_cleanup(drm);
>>  +err_uninstall_irq:
>>  +	drm_irq_uninstall(drm);
>>  +err_cleanup_encoder:
>>  +	drm_encoder_cleanup(&priv->encoder);
>>  +err_cleanup_connector:
>>  +	drm_connector_cleanup(&priv->connector);
>>  +err_cleanup_crtc:
>>  +	drm_crtc_cleanup(&priv->crtc);
>>  +err_cleanup_plane:
>>  +	drm_plane_cleanup(&priv->primary);
>>  +err_unref_drm:
>>  +	drm_dev_put(drm);
>>  +err_free_dma:
>>  +	dma_free_coherent(dev, sizeof(*priv->framedesc),
>>  +			  priv->framedesc, priv->framedesc_phys);
>>  +	return ret;
>>  +}
>>  +
>>  +static int ingenic_drm_remove(struct platform_device *pdev)
>>  +{
>>  +	struct drm_device *drm = platform_get_drvdata(pdev);
>>  +	struct ingenic_drm *priv = drm->dev_private;
>>  +
>>  +	drm_dev_unregister(drm);
>>  +	drm_mode_config_cleanup(drm);
>>  +
>>  +	if (priv->lcd_clk)
>>  +		clk_disable_unprepare(priv->lcd_clk);
>>  +	clk_disable_unprepare(priv->pix_clk);
>>  +
>>  +	drm_vblank_cleanup(drm);
>>  +	drm_irq_uninstall(drm);
>>  +
>>  +	drm_encoder_cleanup(&priv->encoder);
>>  +	drm_connector_cleanup(&priv->connector);
>>  +	drm_crtc_cleanup(&priv->crtc);
>>  +	drm_plane_cleanup(&priv->primary);
>>  +
>>  +	drm_dev_put(drm);
>>  +
>>  +	dma_free_coherent(&pdev->dev, sizeof(*priv->framedesc),
>>  +			  priv->framedesc, priv->framedesc_phys);
>>  +
>>  +	return 0;
>>  +}
>>  +
>>  +static const struct jz_soc_info jz4740_soc_info = {
>>  +	.needs_dev_clk = true,
>>  +};
>>  +
>>  +static const struct jz_soc_info jz4725b_soc_info = {
>>  +	.needs_dev_clk = false,
>>  +};
>>  +
>>  +static const struct of_device_id ingenic_drm_of_match[] = {
>>  +	{ .compatible = "ingenic,jz4740-drm", .data = &jz4740_soc_info },
>>  +	{ .compatible = "ingenic,jz4725b-drm", .data = &jz4725b_soc_info 
>> },
>>  +	{},
>>  +};
>>  +
>>  +static struct platform_driver ingenic_drm_driver = {
>>  +	.driver = {
>>  +		.name = "ingenic-drm",
>>  +		.of_match_table = of_match_ptr(ingenic_drm_of_match),
>>  +	},
>>  +	.probe = ingenic_drm_probe,
>>  +	.remove = ingenic_drm_remove,
>>  +};
>>  +module_platform_driver(ingenic_drm_driver);
>>  +
>>  +MODULE_AUTHOR("Paul Cercueil <[e-mail]>");
>>  +MODULE_DESCRIPTION("DRM driver for the Ingenic SoCs\n");
>>  +MODULE_LICENSE("GPL v2");
>>  --
>>  2.11.0
>> 
> 
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch

Daniel Vetter March 15, 2019, 10:53 a.m. UTC | #5

On Thu, Mar 14, 2019 at 01:36:59PM +0100, Paul Cercueil wrote:
> Hi Daniel,
> 
> Le ven. 1 mars 2019 à 9:26, Daniel Vetter <[e-mail]> a écrit :
> > On Thu, Feb 28, 2019 at 07:07:56PM -0300, Paul Cercueil wrote:
> > >  Add a KMS driver for the Ingenic JZ47xx family of SoCs.
> > >  This driver is meant to replace the aging jz4740-fb driver.
> > > 
> > >  Signed-off-by: Paul Cercueil <[e-mail]>
> > >  Tested-by: Artur Rojek <[e-mail]>
> > 
> > Yay, more fbdev drivers moving to atmic!
> > 
> > Going on vacations for a week now, so just a few quick high-level
> > comments
> > below. Those should make the driver even smaller and cleaner.
> > 
> > >  ---
> > >   drivers/gpu/drm/Kconfig               |   2 +
> > >   drivers/gpu/drm/Makefile              |   1 +
> > >   drivers/gpu/drm/ingenic/Kconfig       |  16 +
> > >   drivers/gpu/drm/ingenic/Makefile      |   1 +
> > >   drivers/gpu/drm/ingenic/ingenic-drm.c | 896
> > > ++++++++++++++++++++++++++++++++++
> > >   5 files changed, 916 insertions(+)
> > >   create mode 100644 drivers/gpu/drm/ingenic/Kconfig
> > >   create mode 100644 drivers/gpu/drm/ingenic/Makefile
> > >   create mode 100644 drivers/gpu/drm/ingenic/ingenic-drm.c
> > > 
> > >  diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> > >  index bd943a71756c..f1929112e559 100644
> > >  --- a/drivers/gpu/drm/Kconfig
> > >  +++ b/drivers/gpu/drm/Kconfig
> > >  @@ -303,6 +303,8 @@ source "drivers/gpu/drm/sti/Kconfig"
> > > 
> > >   source "drivers/gpu/drm/imx/Kconfig"
> > > 
> > >  +source "drivers/gpu/drm/ingenic/Kconfig"
> > >  +
> > >   source "drivers/gpu/drm/v3d/Kconfig"
> > > 
> > >   source "drivers/gpu/drm/vc4/Kconfig"
> > >  diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> > >  index 1ac55c65eac0..9666c0767f44 100644
> > >  --- a/drivers/gpu/drm/Makefile
> > >  +++ b/drivers/gpu/drm/Makefile
> > >  @@ -94,6 +94,7 @@ obj-$(CONFIG_DRM_TEGRA) += tegra/
> > >   obj-$(CONFIG_DRM_STM) += stm/
> > >   obj-$(CONFIG_DRM_STI) += sti/
> > >   obj-$(CONFIG_DRM_IMX) += imx/
> > >  +obj-y			+= ingenic/
> > >   obj-$(CONFIG_DRM_MEDIATEK) += mediatek/
> > >   obj-$(CONFIG_DRM_MESON)	+= meson/
> > >   obj-y			+= i2c/
> > >  diff --git a/drivers/gpu/drm/ingenic/Kconfig
> > > b/drivers/gpu/drm/ingenic/Kconfig
> > >  new file mode 100644
> > >  index 000000000000..d82c3d37ec9c
> > >  --- /dev/null
> > >  +++ b/drivers/gpu/drm/ingenic/Kconfig
> > >  @@ -0,0 +1,16 @@
> > >  +config DRM_INGENIC
> > >  +	tristate "DRM Support for Ingenic SoCs"
> > >  +	depends on MIPS || COMPILE_TEST
> > >  +	depends on DRM
> > >  +	depends on CMA
> > >  +	depends on OF
> > >  +	select DRM_BRIDGE
> > >  +	select DRM_PANEL_BRIDGE
> > >  +	select DRM_KMS_HELPER
> > >  +	select DRM_KMS_CMA_HELPER
> > >  +	select DRM_GEM_CMA_HELPER
> > >  +	select VT_HW_CONSOLE_BINDING if FRAMEBUFFER_CONSOLE
> > >  +	help
> > >  +	  Choose this option for DRM support for the Ingenic SoCs.
> > >  +
> > >  +	  If M is selected the module will be called ingenic-drm.
> > >  diff --git a/drivers/gpu/drm/ingenic/Makefile
> > > b/drivers/gpu/drm/ingenic/Makefile
> > >  new file mode 100644
> > >  index 000000000000..11cac42ce0bb
> > >  --- /dev/null
> > >  +++ b/drivers/gpu/drm/ingenic/Makefile
> > >  @@ -0,0 +1 @@
> > >  +obj-$(CONFIG_DRM_INGENIC) += ingenic-drm.o
> > >  diff --git a/drivers/gpu/drm/ingenic/ingenic-drm.c
> > > b/drivers/gpu/drm/ingenic/ingenic-drm.c
> > >  new file mode 100644
> > >  index 000000000000..18120deea96f
> > >  --- /dev/null
> > >  +++ b/drivers/gpu/drm/ingenic/ingenic-drm.c
> > >  @@ -0,0 +1,896 @@
> > >  +// SPDX-License-Identifier: GPL-2.0
> > >  +//
> > >  +// Ingenic JZ47xx KMS driver
> > >  +//
> > >  +// Copyright (C) 2019, Paul Cercueil <[e-mail]>
> > >  +
> > >  +#include <linux/clk.h>
> > >  +#include <linux/dma-mapping.h>
> > >  +#include <linux/module.h>
> > >  +#include <linux/platform_device.h>
> > >  +#include <linux/regmap.h>
> > >  +
> > >  +#include <drm/drm_atomic.h>
> > >  +#include <drm/drm_atomic_helper.h>
> > >  +#include <drm/drm_crtc.h>
> > >  +#include <drm/drm_crtc_helper.h>
> > >  +#include <drm/drm_drv.h>
> > >  +#include <drm/drm_gem_cma_helper.h>
> > >  +#include <drm/drm_fb_cma_helper.h>
> > >  +#include <drm/drm_fb_helper.h>
> > >  +#include <drm/drm_fourcc.h>
> > >  +#include <drm/drm_gem_framebuffer_helper.h>
> > >  +#include <drm/drm_irq.h>
> > >  +#include <drm/drm_panel.h>
> > >  +#include <drm/drm_plane.h>
> > >  +#include <drm/drm_plane_helper.h>
> > >  +#include <drm/drm_probe_helper.h>
> > >  +#include <drm/drm_vblank.h>
> > >  +
> > >  +#include <dt-bindings/display/ingenic,drm.h>
> > >  +
> > >  +#include "../drm_internal.h"
> > >  +
> > >  +#define JZ_REG_LCD_CFG		0x00
> > >  +#define JZ_REG_LCD_VSYNC	0x04
> > >  +#define JZ_REG_LCD_HSYNC	0x08
> > >  +#define JZ_REG_LCD_VAT		0x0C
> > >  +#define JZ_REG_LCD_DAH		0x10
> > >  +#define JZ_REG_LCD_DAV		0x14
> > >  +#define JZ_REG_LCD_PS		0x18
> > >  +#define JZ_REG_LCD_CLS		0x1C
> > >  +#define JZ_REG_LCD_SPL		0x20
> > >  +#define JZ_REG_LCD_REV		0x24
> > >  +#define JZ_REG_LCD_CTRL		0x30
> > >  +#define JZ_REG_LCD_STATE	0x34
> > >  +#define JZ_REG_LCD_IID		0x38
> > >  +#define JZ_REG_LCD_DA0		0x40
> > >  +#define JZ_REG_LCD_SA0		0x44
> > >  +#define JZ_REG_LCD_FID0		0x48
> > >  +#define JZ_REG_LCD_CMD0		0x4C
> > >  +#define JZ_REG_LCD_DA1		0x50
> > >  +#define JZ_REG_LCD_SA1		0x54
> > >  +#define JZ_REG_LCD_FID1		0x58
> > >  +#define JZ_REG_LCD_CMD1		0x5C
> > >  +
> > >  +#define JZ_LCD_CFG_SLCD			BIT(31)
> > >  +#define JZ_LCD_CFG_PS_DISABLE		BIT(23)
> > >  +#define JZ_LCD_CFG_CLS_DISABLE		BIT(22)
> > >  +#define JZ_LCD_CFG_SPL_DISABLE		BIT(21)
> > >  +#define JZ_LCD_CFG_REV_DISABLE		BIT(20)
> > >  +#define JZ_LCD_CFG_HSYNCM		BIT(19)
> > >  +#define JZ_LCD_CFG_PCLKM		BIT(18)
> > >  +#define JZ_LCD_CFG_INV			BIT(17)
> > >  +#define JZ_LCD_CFG_SYNC_DIR		BIT(16)
> > >  +#define JZ_LCD_CFG_PS_POLARITY		BIT(15)
> > >  +#define JZ_LCD_CFG_CLS_POLARITY		BIT(14)
> > >  +#define JZ_LCD_CFG_SPL_POLARITY		BIT(13)
> > >  +#define JZ_LCD_CFG_REV_POLARITY		BIT(12)
> > >  +#define JZ_LCD_CFG_HSYNC_ACTIVE_LOW	BIT(11)
> > >  +#define JZ_LCD_CFG_PCLK_FALLING_EDGE	BIT(10)
> > >  +#define JZ_LCD_CFG_DE_ACTIVE_LOW	BIT(9)
> > >  +#define JZ_LCD_CFG_VSYNC_ACTIVE_LOW	BIT(8)
> > >  +#define JZ_LCD_CFG_18_BIT		BIT(7)
> > >  +#define JZ_LCD_CFG_PDW			(BIT(5) | BIT(4))
> > >  +#define JZ_LCD_CFG_MODE_MASK		0xf
> > >  +
> > >  +#define JZ_LCD_VSYNC_VPS_OFFSET		16
> > >  +#define JZ_LCD_VSYNC_VPE_OFFSET		0
> > >  +
> > >  +#define JZ_LCD_HSYNC_HPS_OFFSET		16
> > >  +#define JZ_LCD_HSYNC_HPE_OFFSET		0
> > >  +
> > >  +#define JZ_LCD_VAT_HT_OFFSET		16
> > >  +#define JZ_LCD_VAT_VT_OFFSET		0
> > >  +
> > >  +#define JZ_LCD_DAH_HDS_OFFSET		16
> > >  +#define JZ_LCD_DAH_HDE_OFFSET		0
> > >  +
> > >  +#define JZ_LCD_DAV_VDS_OFFSET		16
> > >  +#define JZ_LCD_DAV_VDE_OFFSET		0
> > >  +
> > >  +#define JZ_LCD_CTRL_BURST_4		(0x0 << 28)
> > >  +#define JZ_LCD_CTRL_BURST_8		(0x1 << 28)
> > >  +#define JZ_LCD_CTRL_BURST_16		(0x2 << 28)
> > >  +#define JZ_LCD_CTRL_RGB555		BIT(27)
> > >  +#define JZ_LCD_CTRL_OFUP		BIT(26)
> > >  +#define JZ_LCD_CTRL_FRC_GRAYSCALE_16	(0x0 << 24)
> > >  +#define JZ_LCD_CTRL_FRC_GRAYSCALE_4	(0x1 << 24)
> > >  +#define JZ_LCD_CTRL_FRC_GRAYSCALE_2	(0x2 << 24)
> > >  +#define JZ_LCD_CTRL_PDD_MASK		(0xff << 16)
> > >  +#define JZ_LCD_CTRL_EOF_IRQ		BIT(13)
> > >  +#define JZ_LCD_CTRL_SOF_IRQ		BIT(12)
> > >  +#define JZ_LCD_CTRL_OFU_IRQ		BIT(11)
> > >  +#define JZ_LCD_CTRL_IFU0_IRQ		BIT(10)
> > >  +#define JZ_LCD_CTRL_IFU1_IRQ		BIT(9)
> > >  +#define JZ_LCD_CTRL_DD_IRQ		BIT(8)
> > >  +#define JZ_LCD_CTRL_QDD_IRQ		BIT(7)
> > >  +#define JZ_LCD_CTRL_REVERSE_ENDIAN	BIT(6)
> > >  +#define JZ_LCD_CTRL_LSB_FISRT		BIT(5)
> > >  +#define JZ_LCD_CTRL_DISABLE		BIT(4)
> > >  +#define JZ_LCD_CTRL_ENABLE		BIT(3)
> > >  +#define JZ_LCD_CTRL_BPP_1		0x0
> > >  +#define JZ_LCD_CTRL_BPP_2		0x1
> > >  +#define JZ_LCD_CTRL_BPP_4		0x2
> > >  +#define JZ_LCD_CTRL_BPP_8		0x3
> > >  +#define JZ_LCD_CTRL_BPP_15_16		0x4
> > >  +#define JZ_LCD_CTRL_BPP_18_24		0x5
> > >  +#define JZ_LCD_CTRL_BPP_MASK		(JZ_LCD_CTRL_RGB555 | (0x7 << 0))
> > >  +
> > >  +#define JZ_LCD_CMD_SOF_IRQ		BIT(31)
> > >  +#define JZ_LCD_CMD_EOF_IRQ		BIT(30)
> > >  +#define JZ_LCD_CMD_ENABLE_PAL		BIT(28)
> > >  +
> > >  +#define JZ_LCD_SYNC_MASK		0x3ff
> > >  +
> > >  +#define JZ_LCD_STATE_EOF_IRQ		BIT(5)
> > >  +#define JZ_LCD_STATE_SOF_IRQ		BIT(4)
> > >  +#define JZ_LCD_STATE_DISABLED		BIT(0)
> > >  +
> > >  +struct ingenic_framedesc {
> > >  +	uint32_t next;
> > >  +	uint32_t addr;
> > >  +	uint32_t id;
> > >  +	uint32_t cmd;
> > >  +} __packed;
> > >  +
> > >  +struct jz_soc_info {
> > >  +	bool needs_dev_clk;
> > >  +};
> > >  +
> > >  +struct ingenic_drm {
> > >  +	struct device *dev;
> > 
> > Embedding is kinda the new thing, since it also prevents people from
> > using
> > devm_ for this, which is (strictly speaking, not that it matters much)
> > the
> > wrong lifetime for drm allocations. There's some patches from Noralf
> > that
> > should land soon to make this a bit more convenient.
> > 
> > >  +	void __iomem *base;
> > >  +	struct regmap *map;
> > >  +	struct clk *lcd_clk, *pix_clk;
> > >  +
> > >  +	u32 lcd_mode;
> > >  +
> > >  +	struct ingenic_framedesc *framedesc;
> > >  +	dma_addr_t framedesc_phys;
> > >  +
> > >  +	struct drm_device *drm;
> > >  +	struct drm_plane primary;
> > >  +	struct drm_crtc crtc;
> > >  +	struct drm_connector connector;
> > >  +	struct drm_encoder encoder;
> > 
> > Any reason you didn't opt for the drm_simple_display_pipe helpers? Since
> > you have just 1:1:1 between crtc/plane/encoder that will allow you to
> > ditch lots of boilerplate.
> > 
> > https://dri.freedesktop.org/docs/drm/gpu/drm-kms-helpers.html#simple-kms-helper-reference
> > 
> > >  +	struct drm_panel *panel;
> > >  +
> > >  +	struct device_node *panel_node;
> > 
> > There's panel bridge helpers which takes a panel and wraps it into a
> > drm_bridge (which you can glue into the simple pipe helpers), giving you
> > the connector for free.
> > 
> > https://dri.freedesktop.org/docs/drm/gpu/drm-kms-helpers.html#panel-bridge-helper-reference
> 
> I'm having some trouble using this; if I use a drm_bridge and attach it
> directly to the encoder, how can I get a pointer to the drm_connector?
> I need it to retrieve the connector->display_info.bus_flags.

Not sure why you need these? bridges also have callbacks to adjust state,
crtc code shouldn't really dig around in connectors.
-Daniel

> 
> Thanks,
> -Paul
> 
> > This should cover all the bigger items, details look already really
> > tidy.
> > 
> > Cheers, Daniel
> > 
> > >  +
> > >  +	unsigned short ps_start, ps_end, cls_start,
> > >  +		       cls_end, spl_start, spl_end, rev_start;
> > >  +};
> > >  +
> > >  +static const uint32_t ingenic_drm_primary_formats[] = {
> > >  +	DRM_FORMAT_XRGB1555,
> > >  +	DRM_FORMAT_RGB565,
> > >  +	DRM_FORMAT_XRGB8888,
> > >  +};
> > >  +
> > >  +static bool ingenic_drm_writeable_reg(struct device *dev, unsigned
> > > int reg)
> > >  +{
> > >  +	switch (reg) {
> > >  +	case JZ_REG_LCD_IID:
> > >  +	case JZ_REG_LCD_SA0:
> > >  +	case JZ_REG_LCD_FID0:
> > >  +	case JZ_REG_LCD_CMD0:
> > >  +	case JZ_REG_LCD_SA1:
> > >  +	case JZ_REG_LCD_FID1:
> > >  +	case JZ_REG_LCD_CMD1:
> > >  +		return false;
> > >  +	default:
> > >  +		return true;
> > >  +	}
> > >  +}
> > >  +
> > >  +static const struct regmap_config ingenic_drm_regmap_config = {
> > >  +	.reg_bits = 32,
> > >  +	.val_bits = 32,
> > >  +	.reg_stride = 4,
> > >  +
> > >  +	.max_register = JZ_REG_LCD_CMD1,
> > >  +	.writeable_reg = ingenic_drm_writeable_reg,
> > >  +};
> > >  +
> > >  +static inline struct ingenic_drm *drm_crtc_get_priv(struct
> > > drm_crtc *crtc)
> > >  +{
> > >  +	return container_of(crtc, struct ingenic_drm, crtc);
> > >  +}
> > >  +
> > >  +static inline struct ingenic_drm *drm_plane_get_priv(struct
> > > drm_plane *plane)
> > >  +{
> > >  +	return container_of(plane, struct ingenic_drm, primary);
> > >  +}
> > >  +
> > >  +static inline struct ingenic_drm *drm_conn_get_priv(struct
> > > drm_connector *conn)
> > >  +{
> > >  +	return container_of(conn, struct ingenic_drm, connector);
> > >  +}
> > >  +
> > >  +static void ingenic_drm_crtc_atomic_enable(struct drm_crtc *crtc,
> > >  +					  struct drm_crtc_state *state)
> > >  +{
> > >  +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> > >  +
> > >  +	regmap_write(priv->map, JZ_REG_LCD_STATE, 0);
> > >  +
> > >  +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
> > >  +			   JZ_LCD_CTRL_ENABLE | JZ_LCD_CTRL_DISABLE,
> > >  +			   JZ_LCD_CTRL_ENABLE);
> > >  +
> > >  +	drm_panel_enable(priv->panel);
> > >  +
> > >  +	drm_crtc_vblank_on(crtc);
> > >  +}
> > >  +
> > >  +static void ingenic_drm_crtc_atomic_disable(struct drm_crtc *crtc,
> > >  +					   struct drm_crtc_state *state)
> > >  +{
> > >  +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> > >  +	unsigned int var;
> > >  +
> > >  +	drm_crtc_vblank_off(crtc);
> > >  +
> > >  +	drm_panel_disable(priv->panel);
> > >  +
> > >  +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
> > >  +			   JZ_LCD_CTRL_DISABLE, JZ_LCD_CTRL_DISABLE);
> > >  +
> > >  +	regmap_read_poll_timeout(priv->map, JZ_REG_LCD_STATE, var,
> > >  +				 var & JZ_LCD_STATE_DISABLED,
> > >  +				 1000, 0);
> > >  +}
> > >  +
> > >  +static inline bool ingenic_drm_lcd_is_special_mode(u32 mode)
> > >  +{
> > >  +	switch (mode) {
> > >  +	case JZ_DRM_LCD_SPECIAL_TFT_1:
> > >  +	case JZ_DRM_LCD_SPECIAL_TFT_2:
> > >  +	case JZ_DRM_LCD_SPECIAL_TFT_3:
> > >  +		return true;
> > >  +	default:
> > >  +		return false;
> > >  +	}
> > >  +}
> > >  +
> > >  +static inline bool ingenic_drm_lcd_is_stn_mode(u32 mode)
> > >  +{
> > >  +	switch (mode) {
> > >  +	case JZ_DRM_LCD_SINGLE_COLOR_STN:
> > >  +	case JZ_DRM_LCD_SINGLE_MONOCHROME_STN:
> > >  +	case JZ_DRM_LCD_DUAL_COLOR_STN:
> > >  +	case JZ_DRM_LCD_DUAL_MONOCHROME_STN:
> > >  +		return true;
> > >  +	default:
> > >  +		return false;
> > >  +	}
> > >  +}
> > >  +
> > >  +static void ingenic_drm_crtc_update_timings(struct ingenic_drm
> > > *priv,
> > >  +					    struct drm_display_mode *mode)
> > >  +{
> > >  +	unsigned int vpe, vds, vde, vt, hpe, hds, hde, ht;
> > >  +
> > >  +	vpe = mode->vsync_end - mode->vsync_start;
> > >  +	vds = mode->vtotal - mode->vsync_start;
> > >  +	vde = vds + mode->vdisplay;
> > >  +	vt = vde + mode->vsync_start - mode->vdisplay;
> > >  +
> > >  +	hpe = mode->hsync_end - mode->hsync_start;
> > >  +	hds = mode->htotal - mode->hsync_start;
> > >  +	hde = hds + mode->hdisplay;
> > >  +	ht = hde + mode->hsync_start - mode->hdisplay;
> > >  +
> > >  +	regmap_write(priv->map, JZ_REG_LCD_VSYNC,
> > >  +		     0 << JZ_LCD_VSYNC_VPS_OFFSET |
> > >  +		     vpe << JZ_LCD_VSYNC_VPE_OFFSET);
> > >  +
> > >  +	regmap_write(priv->map, JZ_REG_LCD_HSYNC,
> > >  +		     0 << JZ_LCD_HSYNC_HPS_OFFSET |
> > >  +		     hpe << JZ_LCD_HSYNC_HPE_OFFSET);
> > >  +
> > >  +	regmap_write(priv->map, JZ_REG_LCD_VAT,
> > >  +		     ht << JZ_LCD_VAT_HT_OFFSET |
> > >  +		     vt << JZ_LCD_VAT_VT_OFFSET);
> > >  +
> > >  +	regmap_write(priv->map, JZ_REG_LCD_DAH,
> > >  +		     hds << JZ_LCD_DAH_HDS_OFFSET |
> > >  +		     hde << JZ_LCD_DAH_HDE_OFFSET);
> > >  +	regmap_write(priv->map, JZ_REG_LCD_DAV,
> > >  +		     vds << JZ_LCD_DAV_VDS_OFFSET |
> > >  +		     vde << JZ_LCD_DAV_VDE_OFFSET);
> > >  +
> > >  +	if (ingenic_drm_lcd_is_special_mode(priv->lcd_mode)) {
> > >  +		regmap_write(priv->map, JZ_REG_LCD_PS, hde << 16 | (hde + 1));
> > >  +		regmap_write(priv->map, JZ_REG_LCD_CLS, hde << 16 | (hde + 1));
> > >  +		regmap_write(priv->map, JZ_REG_LCD_SPL, hpe << 16 | (hpe + 1));
> > >  +		regmap_write(priv->map, JZ_REG_LCD_REV, mode->htotal << 16);
> > >  +	}
> > >  +}
> > >  +
> > >  +static void ingenic_drm_crtc_update_cfg(struct ingenic_drm *priv,
> > >  +					struct drm_display_mode *mode)
> > >  +
> > >  +{
> > >  +	unsigned int cfg = priv->lcd_mode;
> > >  +	u32 bus_flags = priv->connector.display_info.bus_flags;
> > >  +
> > >  +	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
> > >  +		cfg |= JZ_LCD_CFG_HSYNC_ACTIVE_LOW;
> > >  +	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
> > >  +		cfg |= JZ_LCD_CFG_VSYNC_ACTIVE_LOW;
> > >  +	if (bus_flags & DRM_BUS_FLAG_DE_LOW)
> > >  +		cfg |= JZ_LCD_CFG_DE_ACTIVE_LOW;
> > >  +	if (bus_flags & DRM_BUS_FLAG_PIXDATA_NEGEDGE)
> > >  +		cfg |= JZ_LCD_CFG_PCLK_FALLING_EDGE;
> > >  +
> > >  +	if (ingenic_drm_lcd_is_special_mode(priv->lcd_mode)) {
> > >  +		// TODO: Is that valid for all special modes?
> > >  +		cfg |= JZ_LCD_CFG_REV_POLARITY;
> > >  +	} else {
> > >  +		cfg |= JZ_LCD_CFG_PS_DISABLE
> > >  +		    | JZ_LCD_CFG_CLS_DISABLE
> > >  +		    | JZ_LCD_CFG_SPL_DISABLE
> > >  +		    | JZ_LCD_CFG_REV_DISABLE;
> > >  +	}
> > >  +
> > >  +	regmap_write(priv->map, JZ_REG_LCD_CFG, cfg);
> > >  +}
> > >  +
> > >  +static void ingenic_drm_crtc_update_ctrl(struct ingenic_drm *priv,
> > >  +					 unsigned int bpp)
> > >  +{
> > >  +	unsigned int ctrl = JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16;
> > >  +
> > >  +	switch (bpp) {
> > >  +	case 1:
> > >  +		ctrl |= JZ_LCD_CTRL_BPP_1;
> > >  +		break;
> > >  +	case 2:
> > >  +		ctrl |= JZ_LCD_CTRL_BPP_2;
> > >  +		break;
> > >  +	case 4:
> > >  +		ctrl |= JZ_LCD_CTRL_BPP_4;
> > >  +		break;
> > >  +	case 8:
> > >  +		ctrl |= JZ_LCD_CTRL_BPP_8;
> > >  +	break;
> > >  +	case 15:
> > >  +		ctrl |= JZ_LCD_CTRL_RGB555; /* Falltrough */
> > >  +	case 16:
> > >  +		ctrl |= JZ_LCD_CTRL_BPP_15_16;
> > >  +		break;
> > >  +	case 18:
> > >  +	case 24:
> > >  +	case 32:
> > >  +		ctrl |= JZ_LCD_CTRL_BPP_18_24;
> > >  +		break;
> > >  +	default:
> > >  +		break;
> > >  +	}
> > >  +
> > >  +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
> > >  +			   JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16 |
> > >  +			   JZ_LCD_CTRL_BPP_MASK, ctrl);
> > >  +}
> > >  +
> > >  +static int ingenic_drm_crtc_atomic_check(struct drm_crtc *crtc,
> > >  +					 struct drm_crtc_state *state)
> > >  +{
> > >  +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> > >  +	long rate;
> > >  +
> > >  +	if (!drm_atomic_crtc_needs_modeset(state))
> > >  +		return 0;
> > >  +
> > >  +	rate = clk_round_rate(priv->pix_clk,
> > >  +			      state->adjusted_mode.clock * 1000);
> > >  +	if (rate < 0)
> > >  +		return rate;
> > >  +
> > >  +	return 0;
> > >  +}
> > >  +
> > >  +static void ingenic_drm_crtc_atomic_flush(struct drm_crtc *crtc,
> > >  +					  struct drm_crtc_state *oldstate)
> > >  +{
> > >  +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> > >  +	struct drm_crtc_state *state = crtc->state;
> > >  +	struct drm_pending_vblank_event *event = state->event;
> > >  +	struct drm_framebuffer *drm_fb = crtc->primary->state->fb;
> > >  +	const struct drm_format_info *finfo;
> > >  +	unsigned int width, height;
> > >  +
> > >  +	if (drm_atomic_crtc_needs_modeset(state)) {
> > >  +		finfo = drm_format_info(drm_fb->format->format);
> > >  +		width = state->adjusted_mode.hdisplay;
> > >  +		height = state->adjusted_mode.vdisplay;
> > >  +
> > >  +		ingenic_drm_crtc_update_timings(priv, &state->mode);
> > >  +
> > >  +		ingenic_drm_crtc_update_ctrl(priv, finfo->depth);
> > >  +		ingenic_drm_crtc_update_cfg(priv, &state->adjusted_mode);
> > >  +
> > >  +		clk_set_rate(priv->pix_clk, state->adjusted_mode.clock * 1000);
> > >  +
> > >  +		regmap_write(priv->map, JZ_REG_LCD_DA0, priv->framedesc->next);
> > >  +	}
> > >  +
> > >  +	if (event) {
> > >  +		state->event = NULL;
> > >  +
> > >  +		spin_lock_irq(&crtc->dev->event_lock);
> > >  +		if (drm_crtc_vblank_get(crtc) == 0)
> > >  +			drm_crtc_arm_vblank_event(crtc, event);
> > >  +		else
> > >  +			drm_crtc_send_vblank_event(crtc, event);
> > >  +		spin_unlock_irq(&crtc->dev->event_lock);
> > >  +	}
> > >  +}
> > >  +
> > >  +static void ingenic_drm_plane_atomic_update(struct drm_plane
> > > *plane,
> > >  +					    struct drm_plane_state *oldstate)
> > >  +{
> > >  +	struct ingenic_drm *priv = drm_plane_get_priv(plane);
> > >  +	struct drm_plane_state *state = plane->state;
> > >  +	const struct drm_format_info *finfo;
> > >  +	unsigned int width, height;
> > >  +
> > >  +	finfo = drm_format_info(state->fb->format->format);
> > >  +	width = state->crtc->state->adjusted_mode.hdisplay;
> > >  +	height = state->crtc->state->adjusted_mode.vdisplay;
> > >  +
> > >  +	priv->framedesc->addr = drm_fb_cma_get_gem_addr(state->fb, state,
> > > 0);
> > >  +
> > >  +	priv->framedesc->cmd = width * height * ((finfo->depth + 7) / 8)
> > > / 4;
> > >  +	priv->framedesc->cmd |= JZ_LCD_CMD_EOF_IRQ;
> > >  +}
> > >  +
> > >  +static enum drm_connector_status
> > >  +ingenic_drm_conn_detect(struct drm_connector *conn, bool force)
> > >  +{
> > >  +	struct ingenic_drm *priv = drm_conn_get_priv(conn);
> > >  +
> > >  +	if (priv->panel) {
> > >  +		drm_panel_attach(priv->panel, conn);
> > >  +
> > >  +		return connector_status_connected;
> > >  +	}
> > >  +
> > >  +	return connector_status_disconnected;
> > >  +}
> > >  +
> > >  +static void ingenic_drm_conn_destroy(struct drm_connector *conn)
> > >  +{
> > >  +	struct ingenic_drm *priv = drm_conn_get_priv(conn);
> > >  +
> > >  +	if (priv->panel)
> > >  +		drm_panel_detach(priv->panel);
> > >  +
> > >  +	drm_connector_cleanup(conn);
> > >  +}
> > >  +
> > >  +static int ingenic_drm_conn_get_modes(struct drm_connector *conn)
> > >  +{
> > >  +	struct ingenic_drm *priv = drm_conn_get_priv(conn);
> > >  +
> > >  +	if (priv->panel)
> > >  +		return priv->panel->funcs->get_modes(priv->panel);
> > >  +
> > >  +	return 0;
> > >  +}
> > >  +
> > >  +static irqreturn_t ingenic_drm_irq_handler(int irq, void *arg)
> > >  +{
> > >  +	struct drm_device *drm = arg;
> > >  +	struct ingenic_drm *priv = drm->dev_private;
> > >  +	unsigned int state;
> > >  +
> > >  +	regmap_read(priv->map, JZ_REG_LCD_STATE, &state);
> > >  +
> > >  +	regmap_update_bits(priv->map, JZ_REG_LCD_STATE,
> > >  +			   JZ_LCD_STATE_EOF_IRQ, 0);
> > >  +
> > >  +	if (state & JZ_LCD_STATE_EOF_IRQ)
> > >  +		drm_crtc_handle_vblank(&priv->crtc);
> > >  +
> > >  +	return IRQ_HANDLED;
> > >  +}
> > >  +
> > >  +static int ingenic_drm_enable_vblank(struct drm_crtc *crtc)
> > >  +{
> > >  +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> > >  +
> > >  +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
> > >  +			   JZ_LCD_CTRL_EOF_IRQ, JZ_LCD_CTRL_EOF_IRQ);
> > >  +
> > >  +	return 0;
> > >  +}
> > >  +
> > >  +static void ingenic_drm_disable_vblank(struct drm_crtc *crtc)
> > >  +{
> > >  +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> > >  +
> > >  +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
> > > JZ_LCD_CTRL_EOF_IRQ, 0);
> > >  +}
> > >  +
> > >  +DEFINE_DRM_GEM_CMA_FOPS(ingenic_drm_fops);
> > >  +
> > >  +static struct drm_driver ingenic_drm_driver_data = {
> > >  +	.driver_features	= DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME
> > >  +				| DRIVER_ATOMIC | DRIVER_HAVE_IRQ,
> > >  +	.name			= "ingenic-drm",
> > >  +	.desc			= "DRM module for Ingenic SoCs",
> > >  +	.date			= "20190228",
> > >  +	.major			= 1,
> > >  +	.minor			= 0,
> > >  +	.patchlevel		= 0,
> > >  +
> > >  +	.fops			= &ingenic_drm_fops,
> > >  +
> > >  +	.dumb_create		= drm_gem_cma_dumb_create,
> > >  +	.gem_free_object_unlocked = drm_gem_cma_free_object,
> > >  +	.gem_vm_ops		= &drm_gem_cma_vm_ops,
> > >  +
> > >  +	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
> > >  +	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
> > >  +	.gem_prime_import	= drm_gem_prime_import,
> > >  +	.gem_prime_export	= drm_gem_prime_export,
> > >  +	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
> > >  +	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
> > >  +	.gem_prime_vmap		= drm_gem_cma_prime_vmap,
> > >  +	.gem_prime_vunmap	= drm_gem_cma_prime_vunmap,
> > >  +	.gem_prime_mmap		= drm_gem_cma_prime_mmap,
> > >  +
> > >  +	.irq_handler		= ingenic_drm_irq_handler,
> > >  +};
> > >  +
> > >  +static const struct drm_plane_funcs
> > > ingenic_drm_primary_plane_funcs = {
> > >  +	.update_plane		= drm_atomic_helper_update_plane,
> > >  +	.disable_plane		= drm_atomic_helper_disable_plane,
> > >  +	.reset			= drm_atomic_helper_plane_reset,
> > >  +
> > >  +	.atomic_duplicate_state	= drm_atomic_helper_plane_duplicate_state,
> > >  +	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
> > >  +};
> > >  +
> > >  +static const struct drm_crtc_funcs ingenic_drm_crtc_funcs = {
> > >  +	.reset			= drm_atomic_helper_crtc_reset,
> > >  +	.set_config		= drm_atomic_helper_set_config,
> > >  +	.page_flip		= drm_atomic_helper_page_flip,
> > >  +
> > >  +	.atomic_duplicate_state	= drm_atomic_helper_crtc_duplicate_state,
> > >  +	.atomic_destroy_state	= drm_atomic_helper_crtc_destroy_state,
> > >  +
> > >  +	.enable_vblank		= ingenic_drm_enable_vblank,
> > >  +	.disable_vblank		= ingenic_drm_disable_vblank,
> > >  +
> > >  +	.gamma_set		= drm_atomic_helper_legacy_gamma_set,
> > >  +};
> > >  +
> > >  +static const struct drm_connector_funcs ingenic_drm_conn_funcs = {
> > >  +	.fill_modes		= drm_helper_probe_single_connector_modes,
> > >  +	.detect			= ingenic_drm_conn_detect,
> > >  +	.destroy		= ingenic_drm_conn_destroy,
> > >  +	.reset			= drm_atomic_helper_connector_reset,
> > >  +	.atomic_duplicate_state	=
> > > drm_atomic_helper_connector_duplicate_state,
> > >  +	.atomic_destroy_state	= drm_atomic_helper_connector_destroy_state,
> > >  +};
> > >  +
> > >  +static const struct drm_plane_helper_funcs
> > > ingenic_drm_plane_helper_funcs = {
> > >  +	.atomic_update		= ingenic_drm_plane_atomic_update,
> > >  +	.prepare_fb		= drm_gem_fb_prepare_fb,
> > >  +};
> > >  +
> > >  +static const struct drm_crtc_helper_funcs
> > > ingenic_drm_crtc_helper_funcs = {
> > >  +	.atomic_enable		= ingenic_drm_crtc_atomic_enable,
> > >  +	.atomic_disable		= ingenic_drm_crtc_atomic_disable,
> > >  +	.atomic_flush		= ingenic_drm_crtc_atomic_flush,
> > >  +	.atomic_check		= ingenic_drm_crtc_atomic_check,
> > >  +};
> > >  +
> > >  +static const struct drm_connector_helper_funcs
> > > ingenic_drm_conn_helper_funcs = {
> > >  +	.get_modes		= ingenic_drm_conn_get_modes,
> > >  +};
> > >  +
> > >  +static const struct drm_mode_config_funcs
> > > ingenic_drm_mode_config_funcs = {
> > >  +	.fb_create		= drm_gem_fb_create,
> > >  +	.output_poll_changed	= drm_fb_helper_output_poll_changed,
> > >  +	.atomic_check		= drm_atomic_helper_check,
> > >  +	.atomic_commit		= drm_atomic_helper_commit,
> > >  +};
> > >  +
> > >  +static const struct drm_encoder_funcs ingenic_drm_encoder_funcs = {
> > >  +	.destroy		= drm_encoder_cleanup,
> > >  +};
> > >  +
> > >  +static int ingenic_drm_probe(struct platform_device *pdev)
> > >  +{
> > >  +	const struct jz_soc_info *soc_info;
> > >  +	struct device *dev = &pdev->dev;
> > >  +	struct ingenic_drm *priv;
> > >  +	struct clk *parent_clk;
> > >  +	struct drm_device *drm;
> > >  +	struct resource *mem;
> > >  +	void __iomem *base;
> > >  +	long parent_rate;
> > >  +	int ret, irq;
> > >  +
> > >  +	soc_info = device_get_match_data(dev);
> > >  +	if (!soc_info)
> > >  +		return -EINVAL;
> > >  +
> > >  +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> > >  +	if (!priv)
> > >  +		return -ENOMEM;
> > >  +
> > >  +	priv->dev = dev;
> > >  +
> > >  +	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > >  +	priv->base = base = devm_ioremap_resource(dev, mem);
> > >  +	if (IS_ERR(base))
> > >  +		return PTR_ERR(base);
> > >  +
> > >  +	irq = platform_get_irq(pdev, 0);
> > >  +	if (irq < 0) {
> > >  +		dev_err(dev, "Failed to get platform irq\n");
> > >  +		return -ENOENT;
> > >  +	}
> > >  +
> > >  +	priv->map = devm_regmap_init_mmio(dev, base,
> > >  +					  &ingenic_drm_regmap_config);
> > >  +	if (IS_ERR(priv->map)) {
> > >  +		dev_err(dev, "Failed to create regmap\n");
> > >  +		return PTR_ERR(priv->map);
> > >  +	}
> > >  +
> > >  +	if (soc_info->needs_dev_clk) {
> > >  +		priv->lcd_clk = devm_clk_get(dev, "lcd");
> > >  +		if (IS_ERR(priv->lcd_clk)) {
> > >  +			dev_err(dev, "Failed to get lcd clock\n");
> > >  +			return PTR_ERR(priv->lcd_clk);
> > >  +		}
> > >  +	}
> > >  +
> > >  +	priv->pix_clk = devm_clk_get(dev, "lcd_pclk");
> > >  +	if (IS_ERR(priv->pix_clk)) {
> > >  +		dev_err(dev, "Failed to get pixel clock\n");
> > >  +		return PTR_ERR(priv->pix_clk);
> > >  +	}
> > >  +
> > >  +	priv->panel_node = of_parse_phandle(dev->of_node,
> > > "ingenic,panel", 0);
> > >  +	if (!priv->panel_node) {
> > >  +		DRM_INFO("No panel found");
> > >  +	} else {
> > >  +		priv->panel = of_drm_find_panel(priv->panel_node);
> > >  +		of_node_put(priv->panel_node);
> > >  +
> > >  +		if (IS_ERR(priv->panel)) {
> > >  +			if (PTR_ERR(priv->panel) == -EPROBE_DEFER)
> > >  +				return -EPROBE_DEFER;
> > >  +
> > >  +			priv->panel = NULL;
> > >  +		} else {
> > >  +			ret = drm_panel_prepare(priv->panel);
> > >  +			if (ret && ret != -ENOSYS)
> > >  +				return ret;
> > >  +		}
> > >  +	}
> > >  +
> > >  +	if (priv->panel) {
> > >  +		ret = device_property_read_u32(dev, "ingenic,lcd-mode",
> > >  +					       &priv->lcd_mode);
> > >  +		if (ret) {
> > >  +			dev_err(dev, "Unable to read ingenic,lcd-mode property\n");
> > >  +			return ret;
> > >  +		}
> > >  +	}
> > >  +
> > >  +	priv->framedesc = dma_alloc_coherent(dev,
> > > sizeof(*priv->framedesc),
> > >  +					     &priv->framedesc_phys, GFP_KERNEL);
> > >  +	if (!priv->framedesc)
> > >  +		return -ENOMEM;
> > >  +
> > >  +	priv->framedesc->next = priv->framedesc_phys;
> > >  +	priv->framedesc->id = 0xdeafbead;
> > >  +
> > >  +	drm = drm_dev_alloc(&ingenic_drm_driver_data, dev);
> > >  +	if (IS_ERR(drm)) {
> > >  +		ret = PTR_ERR(drm);
> > >  +		goto err_free_dma;
> > >  +	}
> > >  +
> > >  +	priv->drm = drm;
> > >  +
> > >  +	drm_mode_config_init(drm);
> > >  +	drm->mode_config.min_width = 0;
> > >  +	drm->mode_config.min_height = 0;
> > >  +	drm->mode_config.max_width = 800;
> > >  +	drm->mode_config.max_height = 600;
> > >  +	drm->mode_config.funcs = &ingenic_drm_mode_config_funcs;
> > >  +
> > >  +	drm_plane_helper_add(&priv->primary,
> > > &ingenic_drm_plane_helper_funcs);
> > >  +
> > >  +	ret = drm_universal_plane_init(drm, &priv->primary,
> > >  +				       0, &ingenic_drm_primary_plane_funcs,
> > >  +				       ingenic_drm_primary_formats,
> > >  +				       ARRAY_SIZE(ingenic_drm_primary_formats),
> > >  +				       NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
> > >  +	if (ret) {
> > >  +		dev_err(dev, "Failed to register primary plane: %i\n", ret);
> > >  +		goto err_unref_drm;
> > >  +	}
> > >  +
> > >  +	drm_crtc_helper_add(&priv->crtc, &ingenic_drm_crtc_helper_funcs);
> > >  +
> > >  +	ret = drm_crtc_init_with_planes(drm, &priv->crtc, &priv->primary,
> > >  +					NULL, &ingenic_drm_crtc_funcs, NULL);
> > >  +	if (ret) {
> > >  +		dev_err(dev, "Failed to init CRTC: %i\n", ret);
> > >  +		goto err_cleanup_plane;
> > >  +	}
> > >  +
> > >  +	drm_connector_helper_add(&priv->connector,
> > >  +				 &ingenic_drm_conn_helper_funcs);
> > >  +	ret = drm_connector_init(drm, &priv->connector,
> > >  +				 &ingenic_drm_conn_funcs,
> > >  +				 DRM_MODE_CONNECTOR_Unknown);
> > >  +	if (ret) {
> > >  +		dev_err(dev, "Failed to init connector: %i\n", ret);
> > >  +		goto err_cleanup_crtc;
> > >  +	}
> > >  +
> > >  +	priv->encoder.possible_crtcs = 1;
> > >  +
> > >  +	ret = drm_encoder_init(drm, &priv->encoder,
> > > &ingenic_drm_encoder_funcs,
> > >  +			       DRM_MODE_ENCODER_NONE, NULL);
> > >  +	if (ret) {
> > >  +		dev_err(dev, "Failed to init encoder: %i\n", ret);
> > >  +		goto err_cleanup_connector;
> > >  +	}
> > >  +
> > >  +	drm_connector_attach_encoder(&priv->connector, &priv->encoder);
> > >  +
> > >  +	platform_set_drvdata(pdev, drm);
> > >  +	priv->drm = drm;
> > >  +	drm->dev_private = priv;
> > >  +
> > >  +	ret = drm_irq_install(drm, irq);
> > >  +	if (ret) {
> > >  +		dev_err(dev, "Unable to install IRQ handler\n");
> > >  +		goto err_cleanup_encoder;
> > >  +	}
> > >  +
> > >  +	ret = drm_vblank_init(drm, 1);
> > >  +	if (ret) {
> > >  +		dev_err(dev, "Failed calling drm_vblank_init()\n");
> > >  +		goto err_uninstall_irq;
> > >  +	}
> > >  +
> > >  +	drm_mode_config_reset(drm);
> > >  +
> > >  +	ret = clk_prepare_enable(priv->pix_clk);
> > >  +	if (ret) {
> > >  +		dev_err(dev, "Unable to start pixel clock\n");
> > >  +		goto err_cleanup_vblank;
> > >  +	}
> > >  +
> > >  +	if (priv->lcd_clk) {
> > >  +		parent_clk = clk_get_parent(priv->lcd_clk);
> > >  +		parent_rate = clk_get_rate(parent_clk);
> > >  +
> > >  +		/* LCD Device clock must be 3x the pixel clock for STN panels,
> > >  +		 * or 1.5x the pixel clock for TFT panels. To avoid having to
> > >  +		 * check for the LCD device clock everytime we do a mode change,
> > >  +		 * we set the LCD device clock to the highest rate possible.
> > >  +		 */
> > >  +		ret = clk_set_rate(priv->lcd_clk, parent_rate);
> > >  +		if (ret) {
> > >  +			dev_err(dev, "Unable to set LCD clock rate\n");
> > >  +			goto err_pixclk_disable;
> > >  +		}
> > >  +
> > >  +		ret = clk_prepare_enable(priv->lcd_clk);
> > >  +		if (ret) {
> > >  +			dev_err(dev, "Unable to start lcd clock\n");
> > >  +			goto err_pixclk_disable;
> > >  +		}
> > >  +	}
> > >  +
> > >  +	ret = drm_fbdev_generic_setup(drm, 16);
> > >  +	if (ret) {
> > >  +		dev_err(dev, "Failed to init fbdev\n");
> > >  +		goto err_devclk_disable;
> > >  +	}
> > >  +
> > >  +	ret = drm_dev_register(drm, 0);
> > >  +	if (ret) {
> > >  +		dev_err(dev, "Failed to register DRM driver\n");
> > >  +		goto err_cleanup_fbdev;
> > >  +	}
> > >  +
> > >  +	return 0;
> > >  +
> > >  +err_cleanup_fbdev:
> > >  +	drm_mode_config_cleanup(drm);
> > >  +err_devclk_disable:
> > >  +	if (priv->lcd_clk)
> > >  +		clk_disable_unprepare(priv->lcd_clk);
> > >  +err_pixclk_disable:
> > >  +	clk_disable_unprepare(priv->pix_clk);
> > >  +err_cleanup_vblank:
> > >  +	drm_vblank_cleanup(drm);
> > >  +err_uninstall_irq:
> > >  +	drm_irq_uninstall(drm);
> > >  +err_cleanup_encoder:
> > >  +	drm_encoder_cleanup(&priv->encoder);
> > >  +err_cleanup_connector:
> > >  +	drm_connector_cleanup(&priv->connector);
> > >  +err_cleanup_crtc:
> > >  +	drm_crtc_cleanup(&priv->crtc);
> > >  +err_cleanup_plane:
> > >  +	drm_plane_cleanup(&priv->primary);
> > >  +err_unref_drm:
> > >  +	drm_dev_put(drm);
> > >  +err_free_dma:
> > >  +	dma_free_coherent(dev, sizeof(*priv->framedesc),
> > >  +			  priv->framedesc, priv->framedesc_phys);
> > >  +	return ret;
> > >  +}
> > >  +
> > >  +static int ingenic_drm_remove(struct platform_device *pdev)
> > >  +{
> > >  +	struct drm_device *drm = platform_get_drvdata(pdev);
> > >  +	struct ingenic_drm *priv = drm->dev_private;
> > >  +
> > >  +	drm_dev_unregister(drm);
> > >  +	drm_mode_config_cleanup(drm);
> > >  +
> > >  +	if (priv->lcd_clk)
> > >  +		clk_disable_unprepare(priv->lcd_clk);
> > >  +	clk_disable_unprepare(priv->pix_clk);
> > >  +
> > >  +	drm_vblank_cleanup(drm);
> > >  +	drm_irq_uninstall(drm);
> > >  +
> > >  +	drm_encoder_cleanup(&priv->encoder);
> > >  +	drm_connector_cleanup(&priv->connector);
> > >  +	drm_crtc_cleanup(&priv->crtc);
> > >  +	drm_plane_cleanup(&priv->primary);
> > >  +
> > >  +	drm_dev_put(drm);
> > >  +
> > >  +	dma_free_coherent(&pdev->dev, sizeof(*priv->framedesc),
> > >  +			  priv->framedesc, priv->framedesc_phys);
> > >  +
> > >  +	return 0;
> > >  +}
> > >  +
> > >  +static const struct jz_soc_info jz4740_soc_info = {
> > >  +	.needs_dev_clk = true,
> > >  +};
> > >  +
> > >  +static const struct jz_soc_info jz4725b_soc_info = {
> > >  +	.needs_dev_clk = false,
> > >  +};
> > >  +
> > >  +static const struct of_device_id ingenic_drm_of_match[] = {
> > >  +	{ .compatible = "ingenic,jz4740-drm", .data = &jz4740_soc_info },
> > >  +	{ .compatible = "ingenic,jz4725b-drm", .data = &jz4725b_soc_info
> > > },
> > >  +	{},
> > >  +};
> > >  +
> > >  +static struct platform_driver ingenic_drm_driver = {
> > >  +	.driver = {
> > >  +		.name = "ingenic-drm",
> > >  +		.of_match_table = of_match_ptr(ingenic_drm_of_match),
> > >  +	},
> > >  +	.probe = ingenic_drm_probe,
> > >  +	.remove = ingenic_drm_remove,
> > >  +};
> > >  +module_platform_driver(ingenic_drm_driver);
> > >  +
> > >  +MODULE_AUTHOR("Paul Cercueil <[e-mail]>");
> > >  +MODULE_DESCRIPTION("DRM driver for the Ingenic SoCs\n");
> > >  +MODULE_LICENSE("GPL v2");
> > >  --
> > >  2.11.0
> > > 
> > 
> > --
> > Daniel Vetter
> > Software Engineer, Intel Corporation
> > http://blog.ffwll.ch
>

Patch

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index bd943a71756c..f1929112e559 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -303,6 +303,8 @@  source "drivers/gpu/drm/sti/Kconfig"
 
 source "drivers/gpu/drm/imx/Kconfig"
 
+source "drivers/gpu/drm/ingenic/Kconfig"
+
 source "drivers/gpu/drm/v3d/Kconfig"
 
 source "drivers/gpu/drm/vc4/Kconfig"
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 1ac55c65eac0..9666c0767f44 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -94,6 +94,7 @@  obj-$(CONFIG_DRM_TEGRA) += tegra/
 obj-$(CONFIG_DRM_STM) += stm/
 obj-$(CONFIG_DRM_STI) += sti/
 obj-$(CONFIG_DRM_IMX) += imx/
+obj-y			+= ingenic/
 obj-$(CONFIG_DRM_MEDIATEK) += mediatek/
 obj-$(CONFIG_DRM_MESON)	+= meson/
 obj-y			+= i2c/
diff --git a/drivers/gpu/drm/ingenic/Kconfig b/drivers/gpu/drm/ingenic/Kconfig
new file mode 100644
index 000000000000..d82c3d37ec9c
--- /dev/null
+++ b/drivers/gpu/drm/ingenic/Kconfig
@@ -0,0 +1,16 @@ 
+config DRM_INGENIC
+	tristate "DRM Support for Ingenic SoCs"
+	depends on MIPS || COMPILE_TEST
+	depends on DRM
+	depends on CMA
+	depends on OF
+	select DRM_BRIDGE
+	select DRM_PANEL_BRIDGE
+	select DRM_KMS_HELPER
+	select DRM_KMS_CMA_HELPER
+	select DRM_GEM_CMA_HELPER
+	select VT_HW_CONSOLE_BINDING if FRAMEBUFFER_CONSOLE
+	help
+	  Choose this option for DRM support for the Ingenic SoCs.
+
+	  If M is selected the module will be called ingenic-drm.
diff --git a/drivers/gpu/drm/ingenic/Makefile b/drivers/gpu/drm/ingenic/Makefile
new file mode 100644
index 000000000000..11cac42ce0bb
--- /dev/null
+++ b/drivers/gpu/drm/ingenic/Makefile
@@ -0,0 +1 @@ 
+obj-$(CONFIG_DRM_INGENIC) += ingenic-drm.o
diff --git a/drivers/gpu/drm/ingenic/ingenic-drm.c b/drivers/gpu/drm/ingenic/ingenic-drm.c
new file mode 100644
index 000000000000..18120deea96f
--- /dev/null
+++ b/drivers/gpu/drm/ingenic/ingenic-drm.c
@@ -0,0 +1,896 @@ 
+// SPDX-License-Identifier: GPL-2.0
+//
+// Ingenic JZ47xx KMS driver
+//
+// Copyright (C) 2019, Paul Cercueil <[e-mail]>
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_irq.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_plane.h>
+#include <drm/drm_plane_helper.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_vblank.h>
+
+#include <dt-bindings/display/ingenic,drm.h>
+
+#include "../drm_internal.h"
+
+#define JZ_REG_LCD_CFG		0x00
+#define JZ_REG_LCD_VSYNC	0x04
+#define JZ_REG_LCD_HSYNC	0x08
+#define JZ_REG_LCD_VAT		0x0C
+#define JZ_REG_LCD_DAH		0x10
+#define JZ_REG_LCD_DAV		0x14
+#define JZ_REG_LCD_PS		0x18
+#define JZ_REG_LCD_CLS		0x1C
+#define JZ_REG_LCD_SPL		0x20
+#define JZ_REG_LCD_REV		0x24
+#define JZ_REG_LCD_CTRL		0x30
+#define JZ_REG_LCD_STATE	0x34
+#define JZ_REG_LCD_IID		0x38
+#define JZ_REG_LCD_DA0		0x40
+#define JZ_REG_LCD_SA0		0x44
+#define JZ_REG_LCD_FID0		0x48
+#define JZ_REG_LCD_CMD0		0x4C
+#define JZ_REG_LCD_DA1		0x50
+#define JZ_REG_LCD_SA1		0x54
+#define JZ_REG_LCD_FID1		0x58
+#define JZ_REG_LCD_CMD1		0x5C
+
+#define JZ_LCD_CFG_SLCD			BIT(31)
+#define JZ_LCD_CFG_PS_DISABLE		BIT(23)
+#define JZ_LCD_CFG_CLS_DISABLE		BIT(22)
+#define JZ_LCD_CFG_SPL_DISABLE		BIT(21)
+#define JZ_LCD_CFG_REV_DISABLE		BIT(20)
+#define JZ_LCD_CFG_HSYNCM		BIT(19)
+#define JZ_LCD_CFG_PCLKM		BIT(18)
+#define JZ_LCD_CFG_INV			BIT(17)
+#define JZ_LCD_CFG_SYNC_DIR		BIT(16)
+#define JZ_LCD_CFG_PS_POLARITY		BIT(15)
+#define JZ_LCD_CFG_CLS_POLARITY		BIT(14)
+#define JZ_LCD_CFG_SPL_POLARITY		BIT(13)
+#define JZ_LCD_CFG_REV_POLARITY		BIT(12)
+#define JZ_LCD_CFG_HSYNC_ACTIVE_LOW	BIT(11)
+#define JZ_LCD_CFG_PCLK_FALLING_EDGE	BIT(10)
+#define JZ_LCD_CFG_DE_ACTIVE_LOW	BIT(9)
+#define JZ_LCD_CFG_VSYNC_ACTIVE_LOW	BIT(8)
+#define JZ_LCD_CFG_18_BIT		BIT(7)
+#define JZ_LCD_CFG_PDW			(BIT(5) | BIT(4))
+#define JZ_LCD_CFG_MODE_MASK		0xf
+
+#define JZ_LCD_VSYNC_VPS_OFFSET		16
+#define JZ_LCD_VSYNC_VPE_OFFSET		0
+
+#define JZ_LCD_HSYNC_HPS_OFFSET		16
+#define JZ_LCD_HSYNC_HPE_OFFSET		0
+
+#define JZ_LCD_VAT_HT_OFFSET		16
+#define JZ_LCD_VAT_VT_OFFSET		0
+
+#define JZ_LCD_DAH_HDS_OFFSET		16
+#define JZ_LCD_DAH_HDE_OFFSET		0
+
+#define JZ_LCD_DAV_VDS_OFFSET		16
+#define JZ_LCD_DAV_VDE_OFFSET		0
+
+#define JZ_LCD_CTRL_BURST_4		(0x0 << 28)
+#define JZ_LCD_CTRL_BURST_8		(0x1 << 28)
+#define JZ_LCD_CTRL_BURST_16		(0x2 << 28)
+#define JZ_LCD_CTRL_RGB555		BIT(27)
+#define JZ_LCD_CTRL_OFUP		BIT(26)
+#define JZ_LCD_CTRL_FRC_GRAYSCALE_16	(0x0 << 24)
+#define JZ_LCD_CTRL_FRC_GRAYSCALE_4	(0x1 << 24)
+#define JZ_LCD_CTRL_FRC_GRAYSCALE_2	(0x2 << 24)
+#define JZ_LCD_CTRL_PDD_MASK		(0xff << 16)
+#define JZ_LCD_CTRL_EOF_IRQ		BIT(13)
+#define JZ_LCD_CTRL_SOF_IRQ		BIT(12)
+#define JZ_LCD_CTRL_OFU_IRQ		BIT(11)
+#define JZ_LCD_CTRL_IFU0_IRQ		BIT(10)
+#define JZ_LCD_CTRL_IFU1_IRQ		BIT(9)
+#define JZ_LCD_CTRL_DD_IRQ		BIT(8)
+#define JZ_LCD_CTRL_QDD_IRQ		BIT(7)
+#define JZ_LCD_CTRL_REVERSE_ENDIAN	BIT(6)
+#define JZ_LCD_CTRL_LSB_FISRT		BIT(5)
+#define JZ_LCD_CTRL_DISABLE		BIT(4)
+#define JZ_LCD_CTRL_ENABLE		BIT(3)
+#define JZ_LCD_CTRL_BPP_1		0x0
+#define JZ_LCD_CTRL_BPP_2		0x1
+#define JZ_LCD_CTRL_BPP_4		0x2
+#define JZ_LCD_CTRL_BPP_8		0x3
+#define JZ_LCD_CTRL_BPP_15_16		0x4
+#define JZ_LCD_CTRL_BPP_18_24		0x5
+#define JZ_LCD_CTRL_BPP_MASK		(JZ_LCD_CTRL_RGB555 | (0x7 << 0))
+
+#define JZ_LCD_CMD_SOF_IRQ		BIT(31)
+#define JZ_LCD_CMD_EOF_IRQ		BIT(30)
+#define JZ_LCD_CMD_ENABLE_PAL		BIT(28)
+
+#define JZ_LCD_SYNC_MASK		0x3ff
+
+#define JZ_LCD_STATE_EOF_IRQ		BIT(5)
+#define JZ_LCD_STATE_SOF_IRQ		BIT(4)
+#define JZ_LCD_STATE_DISABLED		BIT(0)
+
+struct ingenic_framedesc {
+	uint32_t next;
+	uint32_t addr;
+	uint32_t id;
+	uint32_t cmd;
+} __packed;
+
+struct jz_soc_info {
+	bool needs_dev_clk;
+};
+
+struct ingenic_drm {
+	struct device *dev;
+	void __iomem *base;
+	struct regmap *map;
+	struct clk *lcd_clk, *pix_clk;
+
+	u32 lcd_mode;
+
+	struct ingenic_framedesc *framedesc;
+	dma_addr_t framedesc_phys;
+
+	struct drm_device *drm;
+	struct drm_plane primary;
+	struct drm_crtc crtc;
+	struct drm_connector connector;
+	struct drm_encoder encoder;
+	struct drm_panel *panel;
+
+	struct device_node *panel_node;
+
+	unsigned short ps_start, ps_end, cls_start,
+		       cls_end, spl_start, spl_end, rev_start;
+};
+
+static const uint32_t ingenic_drm_primary_formats[] = {
+	DRM_FORMAT_XRGB1555,
+	DRM_FORMAT_RGB565,
+	DRM_FORMAT_XRGB8888,
+};
+
+static bool ingenic_drm_writeable_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case JZ_REG_LCD_IID:
+	case JZ_REG_LCD_SA0:
+	case JZ_REG_LCD_FID0:
+	case JZ_REG_LCD_CMD0:
+	case JZ_REG_LCD_SA1:
+	case JZ_REG_LCD_FID1:
+	case JZ_REG_LCD_CMD1:
+		return false;
+	default:
+		return true;
+	}
+}
+
+static const struct regmap_config ingenic_drm_regmap_config = {
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+
+	.max_register = JZ_REG_LCD_CMD1,
+	.writeable_reg = ingenic_drm_writeable_reg,
+};
+
+static inline struct ingenic_drm *drm_crtc_get_priv(struct drm_crtc *crtc)
+{
+	return container_of(crtc, struct ingenic_drm, crtc);
+}
+
+static inline struct ingenic_drm *drm_plane_get_priv(struct drm_plane *plane)
+{
+	return container_of(plane, struct ingenic_drm, primary);
+}
+
+static inline struct ingenic_drm *drm_conn_get_priv(struct drm_connector *conn)
+{
+	return container_of(conn, struct ingenic_drm, connector);
+}
+
+static void ingenic_drm_crtc_atomic_enable(struct drm_crtc *crtc,
+					  struct drm_crtc_state *state)
+{
+	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
+
+	regmap_write(priv->map, JZ_REG_LCD_STATE, 0);
+
+	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
+			   JZ_LCD_CTRL_ENABLE | JZ_LCD_CTRL_DISABLE,
+			   JZ_LCD_CTRL_ENABLE);
+
+	drm_panel_enable(priv->panel);
+
+	drm_crtc_vblank_on(crtc);
+}
+
+static void ingenic_drm_crtc_atomic_disable(struct drm_crtc *crtc,
+					   struct drm_crtc_state *state)
+{
+	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
+	unsigned int var;
+
+	drm_crtc_vblank_off(crtc);
+
+	drm_panel_disable(priv->panel);
+
+	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
+			   JZ_LCD_CTRL_DISABLE, JZ_LCD_CTRL_DISABLE);
+
+	regmap_read_poll_timeout(priv->map, JZ_REG_LCD_STATE, var,
+				 var & JZ_LCD_STATE_DISABLED,
+				 1000, 0);
+}
+
+static inline bool ingenic_drm_lcd_is_special_mode(u32 mode)
+{
+	switch (mode) {
+	case JZ_DRM_LCD_SPECIAL_TFT_1:
+	case JZ_DRM_LCD_SPECIAL_TFT_2:
+	case JZ_DRM_LCD_SPECIAL_TFT_3:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static inline bool ingenic_drm_lcd_is_stn_mode(u32 mode)
+{
+	switch (mode) {
+	case JZ_DRM_LCD_SINGLE_COLOR_STN:
+	case JZ_DRM_LCD_SINGLE_MONOCHROME_STN:
+	case JZ_DRM_LCD_DUAL_COLOR_STN:
+	case JZ_DRM_LCD_DUAL_MONOCHROME_STN:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static void ingenic_drm_crtc_update_timings(struct ingenic_drm *priv,
+					    struct drm_display_mode *mode)
+{
+	unsigned int vpe, vds, vde, vt, hpe, hds, hde, ht;
+
+	vpe = mode->vsync_end - mode->vsync_start;
+	vds = mode->vtotal - mode->vsync_start;
+	vde = vds + mode->vdisplay;
+	vt = vde + mode->vsync_start - mode->vdisplay;
+
+	hpe = mode->hsync_end - mode->hsync_start;
+	hds = mode->htotal - mode->hsync_start;
+	hde = hds + mode->hdisplay;
+	ht = hde + mode->hsync_start - mode->hdisplay;
+
+	regmap_write(priv->map, JZ_REG_LCD_VSYNC,
+		     0 << JZ_LCD_VSYNC_VPS_OFFSET |
+		     vpe << JZ_LCD_VSYNC_VPE_OFFSET);
+
+	regmap_write(priv->map, JZ_REG_LCD_HSYNC,
+		     0 << JZ_LCD_HSYNC_HPS_OFFSET |
+		     hpe << JZ_LCD_HSYNC_HPE_OFFSET);
+
+	regmap_write(priv->map, JZ_REG_LCD_VAT,
+		     ht << JZ_LCD_VAT_HT_OFFSET |
+		     vt << JZ_LCD_VAT_VT_OFFSET);
+
+	regmap_write(priv->map, JZ_REG_LCD_DAH,
+		     hds << JZ_LCD_DAH_HDS_OFFSET |
+		     hde << JZ_LCD_DAH_HDE_OFFSET);
+	regmap_write(priv->map, JZ_REG_LCD_DAV,
+		     vds << JZ_LCD_DAV_VDS_OFFSET |
+		     vde << JZ_LCD_DAV_VDE_OFFSET);
+
+	if (ingenic_drm_lcd_is_special_mode(priv->lcd_mode)) {
+		regmap_write(priv->map, JZ_REG_LCD_PS, hde << 16 | (hde + 1));
+		regmap_write(priv->map, JZ_REG_LCD_CLS, hde << 16 | (hde + 1));
+		regmap_write(priv->map, JZ_REG_LCD_SPL, hpe << 16 | (hpe + 1));
+		regmap_write(priv->map, JZ_REG_LCD_REV, mode->htotal << 16);
+	}
+}
+
+static void ingenic_drm_crtc_update_cfg(struct ingenic_drm *priv,
+					struct drm_display_mode *mode)
+
+{
+	unsigned int cfg = priv->lcd_mode;
+	u32 bus_flags = priv->connector.display_info.bus_flags;
+
+	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
+		cfg |= JZ_LCD_CFG_HSYNC_ACTIVE_LOW;
+	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
+		cfg |= JZ_LCD_CFG_VSYNC_ACTIVE_LOW;
+	if (bus_flags & DRM_BUS_FLAG_DE_LOW)
+		cfg |= JZ_LCD_CFG_DE_ACTIVE_LOW;
+	if (bus_flags & DRM_BUS_FLAG_PIXDATA_NEGEDGE)
+		cfg |= JZ_LCD_CFG_PCLK_FALLING_EDGE;
+
+	if (ingenic_drm_lcd_is_special_mode(priv->lcd_mode)) {
+		// TODO: Is that valid for all special modes?
+		cfg |= JZ_LCD_CFG_REV_POLARITY;
+	} else {
+		cfg |= JZ_LCD_CFG_PS_DISABLE
+		    | JZ_LCD_CFG_CLS_DISABLE
+		    | JZ_LCD_CFG_SPL_DISABLE
+		    | JZ_LCD_CFG_REV_DISABLE;
+	}
+
+	regmap_write(priv->map, JZ_REG_LCD_CFG, cfg);
+}
+
+static void ingenic_drm_crtc_update_ctrl(struct ingenic_drm *priv,
+					 unsigned int bpp)
+{
+	unsigned int ctrl = JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16;
+
+	switch (bpp) {
+	case 1:
+		ctrl |= JZ_LCD_CTRL_BPP_1;
+		break;
+	case 2:
+		ctrl |= JZ_LCD_CTRL_BPP_2;
+		break;
+	case 4:
+		ctrl |= JZ_LCD_CTRL_BPP_4;
+		break;
+	case 8:
+		ctrl |= JZ_LCD_CTRL_BPP_8;
+	break;
+	case 15:
+		ctrl |= JZ_LCD_CTRL_RGB555; /* Falltrough */
+	case 16:
+		ctrl |= JZ_LCD_CTRL_BPP_15_16;
+		break;
+	case 18:
+	case 24:
+	case 32:
+		ctrl |= JZ_LCD_CTRL_BPP_18_24;
+		break;
+	default:
+		break;
+	}
+
+	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
+			   JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16 |
+			   JZ_LCD_CTRL_BPP_MASK, ctrl);
+}
+
+static int ingenic_drm_crtc_atomic_check(struct drm_crtc *crtc,
+					 struct drm_crtc_state *state)
+{
+	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
+	long rate;
+
+	if (!drm_atomic_crtc_needs_modeset(state))
+		return 0;
+
+	rate = clk_round_rate(priv->pix_clk,
+			      state->adjusted_mode.clock * 1000);
+	if (rate < 0)
+		return rate;
+
+	return 0;
+}
+
+static void ingenic_drm_crtc_atomic_flush(struct drm_crtc *crtc,
+					  struct drm_crtc_state *oldstate)
+{
+	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
+	struct drm_crtc_state *state = crtc->state;
+	struct drm_pending_vblank_event *event = state->event;
+	struct drm_framebuffer *drm_fb = crtc->primary->state->fb;
+	const struct drm_format_info *finfo;
+	unsigned int width, height;
+
+	if (drm_atomic_crtc_needs_modeset(state)) {
+		finfo = drm_format_info(drm_fb->format->format);
+		width = state->adjusted_mode.hdisplay;
+		height = state->adjusted_mode.vdisplay;
+
+		ingenic_drm_crtc_update_timings(priv, &state->mode);
+
+		ingenic_drm_crtc_update_ctrl(priv, finfo->depth);
+		ingenic_drm_crtc_update_cfg(priv, &state->adjusted_mode);
+
+		clk_set_rate(priv->pix_clk, state->adjusted_mode.clock * 1000);
+
+		regmap_write(priv->map, JZ_REG_LCD_DA0, priv->framedesc->next);
+	}
+
+	if (event) {
+		state->event = NULL;
+
+		spin_lock_irq(&crtc->dev->event_lock);
+		if (drm_crtc_vblank_get(crtc) == 0)
+			drm_crtc_arm_vblank_event(crtc, event);
+		else
+			drm_crtc_send_vblank_event(crtc, event);
+		spin_unlock_irq(&crtc->dev->event_lock);
+	}
+}
+
+static void ingenic_drm_plane_atomic_update(struct drm_plane *plane,
+					    struct drm_plane_state *oldstate)
+{
+	struct ingenic_drm *priv = drm_plane_get_priv(plane);
+	struct drm_plane_state *state = plane->state;
+	const struct drm_format_info *finfo;
+	unsigned int width, height;
+
+	finfo = drm_format_info(state->fb->format->format);
+	width = state->crtc->state->adjusted_mode.hdisplay;
+	height = state->crtc->state->adjusted_mode.vdisplay;
+
+	priv->framedesc->addr = drm_fb_cma_get_gem_addr(state->fb, state, 0);
+
+	priv->framedesc->cmd = width * height * ((finfo->depth + 7) / 8) / 4;
+	priv->framedesc->cmd |= JZ_LCD_CMD_EOF_IRQ;
+}
+
+static enum drm_connector_status
+ingenic_drm_conn_detect(struct drm_connector *conn, bool force)
+{
+	struct ingenic_drm *priv = drm_conn_get_priv(conn);
+
+	if (priv->panel) {
+		drm_panel_attach(priv->panel, conn);
+
+		return connector_status_connected;
+	}
+
+	return connector_status_disconnected;
+}
+
+static void ingenic_drm_conn_destroy(struct drm_connector *conn)
+{
+	struct ingenic_drm *priv = drm_conn_get_priv(conn);
+
+	if (priv->panel)
+		drm_panel_detach(priv->panel);
+
+	drm_connector_cleanup(conn);
+}
+
+static int ingenic_drm_conn_get_modes(struct drm_connector *conn)
+{
+	struct ingenic_drm *priv = drm_conn_get_priv(conn);
+
+	if (priv->panel)
+		return priv->panel->funcs->get_modes(priv->panel);
+
+	return 0;
+}
+
+static irqreturn_t ingenic_drm_irq_handler(int irq, void *arg)
+{
+	struct drm_device *drm = arg;
+	struct ingenic_drm *priv = drm->dev_private;
+	unsigned int state;
+
+	regmap_read(priv->map, JZ_REG_LCD_STATE, &state);
+
+	regmap_update_bits(priv->map, JZ_REG_LCD_STATE,
+			   JZ_LCD_STATE_EOF_IRQ, 0);
+
+	if (state & JZ_LCD_STATE_EOF_IRQ)
+		drm_crtc_handle_vblank(&priv->crtc);
+
+	return IRQ_HANDLED;
+}
+
+static int ingenic_drm_enable_vblank(struct drm_crtc *crtc)
+{
+	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
+
+	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
+			   JZ_LCD_CTRL_EOF_IRQ, JZ_LCD_CTRL_EOF_IRQ);
+
+	return 0;
+}
+
+static void ingenic_drm_disable_vblank(struct drm_crtc *crtc)
+{
+	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
+
+	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL, JZ_LCD_CTRL_EOF_IRQ, 0);
+}
+
+DEFINE_DRM_GEM_CMA_FOPS(ingenic_drm_fops);
+
+static struct drm_driver ingenic_drm_driver_data = {
+	.driver_features	= DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME
+				| DRIVER_ATOMIC | DRIVER_HAVE_IRQ,
+	.name			= "ingenic-drm",
+	.desc			= "DRM module for Ingenic SoCs",
+	.date			= "20190228",
+	.major			= 1,
+	.minor			= 0,
+	.patchlevel		= 0,
+
+	.fops			= &ingenic_drm_fops,
+
+	.dumb_create		= drm_gem_cma_dumb_create,
+	.gem_free_object_unlocked = drm_gem_cma_free_object,
+	.gem_vm_ops		= &drm_gem_cma_vm_ops,
+
+	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
+	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
+	.gem_prime_import	= drm_gem_prime_import,
+	.gem_prime_export	= drm_gem_prime_export,
+	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
+	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
+	.gem_prime_vmap		= drm_gem_cma_prime_vmap,
+	.gem_prime_vunmap	= drm_gem_cma_prime_vunmap,
+	.gem_prime_mmap		= drm_gem_cma_prime_mmap,
+
+	.irq_handler		= ingenic_drm_irq_handler,
+};
+
+static const struct drm_plane_funcs ingenic_drm_primary_plane_funcs = {
+	.update_plane		= drm_atomic_helper_update_plane,
+	.disable_plane		= drm_atomic_helper_disable_plane,
+	.reset			= drm_atomic_helper_plane_reset,
+
+	.atomic_duplicate_state	= drm_atomic_helper_plane_duplicate_state,
+	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
+};
+
+static const struct drm_crtc_funcs ingenic_drm_crtc_funcs = {
+	.reset			= drm_atomic_helper_crtc_reset,
+	.set_config		= drm_atomic_helper_set_config,
+	.page_flip		= drm_atomic_helper_page_flip,
+
+	.atomic_duplicate_state	= drm_atomic_helper_crtc_duplicate_state,
+	.atomic_destroy_state	= drm_atomic_helper_crtc_destroy_state,
+
+	.enable_vblank		= ingenic_drm_enable_vblank,
+	.disable_vblank		= ingenic_drm_disable_vblank,
+
+	.gamma_set		= drm_atomic_helper_legacy_gamma_set,
+};
+
+static const struct drm_connector_funcs ingenic_drm_conn_funcs = {
+	.fill_modes		= drm_helper_probe_single_connector_modes,
+	.detect			= ingenic_drm_conn_detect,
+	.destroy		= ingenic_drm_conn_destroy,
+	.reset			= drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state	= drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state	= drm_atomic_helper_connector_destroy_state,
+};
+
+static const struct drm_plane_helper_funcs ingenic_drm_plane_helper_funcs = {
+	.atomic_update		= ingenic_drm_plane_atomic_update,
+	.prepare_fb		= drm_gem_fb_prepare_fb,
+};
+
+static const struct drm_crtc_helper_funcs ingenic_drm_crtc_helper_funcs = {
+	.atomic_enable		= ingenic_drm_crtc_atomic_enable,
+	.atomic_disable		= ingenic_drm_crtc_atomic_disable,
+	.atomic_flush		= ingenic_drm_crtc_atomic_flush,
+	.atomic_check		= ingenic_drm_crtc_atomic_check,
+};
+
+static const struct drm_connector_helper_funcs ingenic_drm_conn_helper_funcs = {
+	.get_modes		= ingenic_drm_conn_get_modes,
+};
+
+static const struct drm_mode_config_funcs ingenic_drm_mode_config_funcs = {
+	.fb_create		= drm_gem_fb_create,
+	.output_poll_changed	= drm_fb_helper_output_poll_changed,
+	.atomic_check		= drm_atomic_helper_check,
+	.atomic_commit		= drm_atomic_helper_commit,
+};
+
+static const struct drm_encoder_funcs ingenic_drm_encoder_funcs = {
+	.destroy		= drm_encoder_cleanup,
+};
+
+static int ingenic_drm_probe(struct platform_device *pdev)
+{
+	const struct jz_soc_info *soc_info;
+	struct device *dev = &pdev->dev;
+	struct ingenic_drm *priv;
+	struct clk *parent_clk;
+	struct drm_device *drm;
+	struct resource *mem;
+	void __iomem *base;
+	long parent_rate;
+	int ret, irq;
+
+	soc_info = device_get_match_data(dev);
+	if (!soc_info)
+		return -EINVAL;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->dev = dev;
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	priv->base = base = devm_ioremap_resource(dev, mem);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(dev, "Failed to get platform irq\n");
+		return -ENOENT;
+	}
+
+	priv->map = devm_regmap_init_mmio(dev, base,
+					  &ingenic_drm_regmap_config);
+	if (IS_ERR(priv->map)) {
+		dev_err(dev, "Failed to create regmap\n");
+		return PTR_ERR(priv->map);
+	}
+
+	if (soc_info->needs_dev_clk) {
+		priv->lcd_clk = devm_clk_get(dev, "lcd");
+		if (IS_ERR(priv->lcd_clk)) {
+			dev_err(dev, "Failed to get lcd clock\n");
+			return PTR_ERR(priv->lcd_clk);
+		}
+	}
+
+	priv->pix_clk = devm_clk_get(dev, "lcd_pclk");
+	if (IS_ERR(priv->pix_clk)) {
+		dev_err(dev, "Failed to get pixel clock\n");
+		return PTR_ERR(priv->pix_clk);
+	}
+
+	priv->panel_node = of_parse_phandle(dev->of_node, "ingenic,panel", 0);
+	if (!priv->panel_node) {
+		DRM_INFO("No panel found");
+	} else {
+		priv->panel = of_drm_find_panel(priv->panel_node);
+		of_node_put(priv->panel_node);
+
+		if (IS_ERR(priv->panel)) {
+			if (PTR_ERR(priv->panel) == -EPROBE_DEFER)
+				return -EPROBE_DEFER;
+
+			priv->panel = NULL;
+		} else {
+			ret = drm_panel_prepare(priv->panel);
+			if (ret && ret != -ENOSYS)
+				return ret;
+		}
+	}
+
+	if (priv->panel) {
+		ret = device_property_read_u32(dev, "ingenic,lcd-mode",
+					       &priv->lcd_mode);
+		if (ret) {
+			dev_err(dev, "Unable to read ingenic,lcd-mode property\n");
+			return ret;
+		}
+	}
+
+	priv->framedesc = dma_alloc_coherent(dev, sizeof(*priv->framedesc),
+					     &priv->framedesc_phys, GFP_KERNEL);
+	if (!priv->framedesc)
+		return -ENOMEM;
+
+	priv->framedesc->next = priv->framedesc_phys;
+	priv->framedesc->id = 0xdeafbead;
+
+	drm = drm_dev_alloc(&ingenic_drm_driver_data, dev);
+	if (IS_ERR(drm)) {
+		ret = PTR_ERR(drm);
+		goto err_free_dma;
+	}
+
+	priv->drm = drm;
+
+	drm_mode_config_init(drm);
+	drm->mode_config.min_width = 0;
+	drm->mode_config.min_height = 0;
+	drm->mode_config.max_width = 800;
+	drm->mode_config.max_height = 600;
+	drm->mode_config.funcs = &ingenic_drm_mode_config_funcs;
+
+	drm_plane_helper_add(&priv->primary, &ingenic_drm_plane_helper_funcs);
+
+	ret = drm_universal_plane_init(drm, &priv->primary,
+				       0, &ingenic_drm_primary_plane_funcs,
+				       ingenic_drm_primary_formats,
+				       ARRAY_SIZE(ingenic_drm_primary_formats),
+				       NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (ret) {
+		dev_err(dev, "Failed to register primary plane: %i\n", ret);
+		goto err_unref_drm;
+	}
+
+	drm_crtc_helper_add(&priv->crtc, &ingenic_drm_crtc_helper_funcs);
+
+	ret = drm_crtc_init_with_planes(drm, &priv->crtc, &priv->primary,
+					NULL, &ingenic_drm_crtc_funcs, NULL);
+	if (ret) {
+		dev_err(dev, "Failed to init CRTC: %i\n", ret);
+		goto err_cleanup_plane;
+	}
+
+	drm_connector_helper_add(&priv->connector,
+				 &ingenic_drm_conn_helper_funcs);
+	ret = drm_connector_init(drm, &priv->connector,
+				 &ingenic_drm_conn_funcs,
+				 DRM_MODE_CONNECTOR_Unknown);
+	if (ret) {
+		dev_err(dev, "Failed to init connector: %i\n", ret);
+		goto err_cleanup_crtc;
+	}
+
+	priv->encoder.possible_crtcs = 1;
+
+	ret = drm_encoder_init(drm, &priv->encoder, &ingenic_drm_encoder_funcs,
+			       DRM_MODE_ENCODER_NONE, NULL);
+	if (ret) {
+		dev_err(dev, "Failed to init encoder: %i\n", ret);
+		goto err_cleanup_connector;
+	}
+
+	drm_connector_attach_encoder(&priv->connector, &priv->encoder);
+
+	platform_set_drvdata(pdev, drm);
+	priv->drm = drm;
+	drm->dev_private = priv;
+
+	ret = drm_irq_install(drm, irq);
+	if (ret) {
+		dev_err(dev, "Unable to install IRQ handler\n");
+		goto err_cleanup_encoder;
+	}
+
+	ret = drm_vblank_init(drm, 1);
+	if (ret) {
+		dev_err(dev, "Failed calling drm_vblank_init()\n");
+		goto err_uninstall_irq;
+	}
+
+	drm_mode_config_reset(drm);
+
+	ret = clk_prepare_enable(priv->pix_clk);
+	if (ret) {
+		dev_err(dev, "Unable to start pixel clock\n");
+		goto err_cleanup_vblank;
+	}
+
+	if (priv->lcd_clk) {
+		parent_clk = clk_get_parent(priv->lcd_clk);
+		parent_rate = clk_get_rate(parent_clk);
+
+		/* LCD Device clock must be 3x the pixel clock for STN panels,
+		 * or 1.5x the pixel clock for TFT panels. To avoid having to
+		 * check for the LCD device clock everytime we do a mode change,
+		 * we set the LCD device clock to the highest rate possible.
+		 */
+		ret = clk_set_rate(priv->lcd_clk, parent_rate);
+		if (ret) {
+			dev_err(dev, "Unable to set LCD clock rate\n");
+			goto err_pixclk_disable;
+		}
+
+		ret = clk_prepare_enable(priv->lcd_clk);
+		if (ret) {
+			dev_err(dev, "Unable to start lcd clock\n");
+			goto err_pixclk_disable;
+		}
+	}
+
+	ret = drm_fbdev_generic_setup(drm, 16);
+	if (ret) {
+		dev_err(dev, "Failed to init fbdev\n");
+		goto err_devclk_disable;
+	}
+
+	ret = drm_dev_register(drm, 0);
+	if (ret) {
+		dev_err(dev, "Failed to register DRM driver\n");
+		goto err_cleanup_fbdev;
+	}
+
+	return 0;
+
+err_cleanup_fbdev:
+	drm_mode_config_cleanup(drm);
+err_devclk_disable:
+	if (priv->lcd_clk)
+		clk_disable_unprepare(priv->lcd_clk);
+err_pixclk_disable:
+	clk_disable_unprepare(priv->pix_clk);
+err_cleanup_vblank:
+	drm_vblank_cleanup(drm);
+err_uninstall_irq:
+	drm_irq_uninstall(drm);
+err_cleanup_encoder:
+	drm_encoder_cleanup(&priv->encoder);
+err_cleanup_connector:
+	drm_connector_cleanup(&priv->connector);
+err_cleanup_crtc:
+	drm_crtc_cleanup(&priv->crtc);
+err_cleanup_plane:
+	drm_plane_cleanup(&priv->primary);
+err_unref_drm:
+	drm_dev_put(drm);
+err_free_dma:
+	dma_free_coherent(dev, sizeof(*priv->framedesc),
+			  priv->framedesc, priv->framedesc_phys);
+	return ret;
+}
+
+static int ingenic_drm_remove(struct platform_device *pdev)
+{
+	struct drm_device *drm = platform_get_drvdata(pdev);
+	struct ingenic_drm *priv = drm->dev_private;
+
+	drm_dev_unregister(drm);
+	drm_mode_config_cleanup(drm);
+
+	if (priv->lcd_clk)
+		clk_disable_unprepare(priv->lcd_clk);
+	clk_disable_unprepare(priv->pix_clk);
+
+	drm_vblank_cleanup(drm);
+	drm_irq_uninstall(drm);
+
+	drm_encoder_cleanup(&priv->encoder);
+	drm_connector_cleanup(&priv->connector);
+	drm_crtc_cleanup(&priv->crtc);
+	drm_plane_cleanup(&priv->primary);
+
+	drm_dev_put(drm);
+
+	dma_free_coherent(&pdev->dev, sizeof(*priv->framedesc),
+			  priv->framedesc, priv->framedesc_phys);
+
+	return 0;
+}
+
+static const struct jz_soc_info jz4740_soc_info = {
+	.needs_dev_clk = true,
+};
+
+static const struct jz_soc_info jz4725b_soc_info = {
+	.needs_dev_clk = false,
+};
+
+static const struct of_device_id ingenic_drm_of_match[] = {
+	{ .compatible = "ingenic,jz4740-drm", .data = &jz4740_soc_info },
+	{ .compatible = "ingenic,jz4725b-drm", .data = &jz4725b_soc_info },
+	{},
+};
+
+static struct platform_driver ingenic_drm_driver = {
+	.driver = {
+		.name = "ingenic-drm",
+		.of_match_table = of_match_ptr(ingenic_drm_of_match),
+	},
+	.probe = ingenic_drm_probe,
+	.remove = ingenic_drm_remove,
+};
+module_platform_driver(ingenic_drm_driver);
+
+MODULE_AUTHOR("Paul Cercueil <[e-mail]>");
+MODULE_DESCRIPTION("DRM driver for the Ingenic SoCs\n");
+MODULE_LICENSE("GPL v2");