Subject: [PATCH v4 05/16] drm: bridge: analogix/dp: dynamic parse sync_pol & interlace & colorimetry

From: [email-masked] (Yakir Yang)
Date: Sun, 06 Sep 2015 10:00:41 +0800

Hi Krzysztof,

? 09/03/2015 04:04 PM, Krzysztof Kozlowski ??:
> On 01.09.2015 14:55, Yakir Yang wrote:
>> Both hsync/vsync polarity and interlace mode can be parsed from
>> drm display mode, and dynamic_range and ycbcr_coeff can be judge
>> by the video code, same to color space and color depth can be
>> parsed from EDID.
>>
>> But presumably Exynos still relaies on the DT properties, so take
> s/relaies/relies/
>
>> good use of mode_fixup() in to achieve the compatibility hacks.
>>
>> Signed-off-by: Yakir Yang <[email-masked]>
>> ---
>> Changes in v4:
>> - Take Krzysztof suggest, provide backword compatibility with samsung.
>> - Take Thierry suggest, add "color-depth" and "color-space" dynamic parsed.
>>
>> Changes in v3:
>> - Take Thierry Reding suggest, dynamic parse video timing info from
>>    struct drm_display_mode and struct drm_display_info.
>>
>> Changes in v2: None
>>
>>   drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 141 +++++++++++++--------
>>   drivers/gpu/drm/bridge/analogix/analogix_dp_core.h |   2 +-
>>   drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c  |  14 +-
>>   drivers/gpu/drm/exynos/exynos_dp.c                 |  58 ++++++++-
>>   4 files changed, 151 insertions(+), 64 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> index 7196097..f0db92e 100644
>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> @@ -897,8 +897,8 @@ static void analogix_dp_commit(struct analogix_dp_device *dp)
>>   		return;
>>   	}
>>   
>> -	ret = analogix_dp_set_link_train(dp, dp->video_info->lane_count,
>> -					 dp->video_info->link_rate);
>> +	ret = analogix_dp_set_link_train(dp, dp->video_info.lane_count,
>> +					 dp->video_info.link_rate);
>>   	if (ret) {
>>   		dev_err(dp->dev, "unable to do link train\n");
>>   		return;
>> @@ -1081,6 +1081,82 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
>>   	dp->dpms_mode = DRM_MODE_DPMS_OFF;
>>   }
>>   
>> +static void analogix_dp_bridge_mode_set(struct drm_bridge *bridge,
>> +					struct drm_display_mode *orig_mode,
>> +					struct drm_display_mode *mode)
>> +{
>> +	struct analogix_dp_device *dp = bridge->driver_private;
>> +	struct drm_display_info *display_info = &dp->connector.display_info;
>> +	struct video_info *video_info = &dp->video_info;
>> +	struct device_node *dp_node = dp->dev->of_node;
>> +	int vic;
>> +
>> +	/* interlaces & hsync pol & vsync pol */
>> +	video_info->interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
>> +	video_info->v_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NVSYNC);
>> +	video_info->h_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NHSYNC);
>> +
>> +	/* dynamic_range & colorimetry */
>> +	vic = drm_match_cea_mode(mode);
>> +	if ((vic == 6) || (vic == 7) || (vic == 21) || (vic == 22) ||
>> +	    (vic == 2) || (vic == 3) || (vic == 17) || (vic == 18)) {
>> +		video_info->dynamic_range = CEA;
>> +		video_info->ycbcr_coeff = COLOR_YCBCR601;
>> +	} else if (vic) {
>> +		video_info->dynamic_range = CEA;
>> +		video_info->ycbcr_coeff = COLOR_YCBCR709;
>> +	} else {
>> +		video_info->dynamic_range = VESA;
>> +		video_info->ycbcr_coeff = COLOR_YCBCR709;
>> +	}
>> +
>> +	switch (display_info->bpc) {
>> +	case 12:
>> +		video_info->color_depth = COLOR_12;
>> +		break;
>> +	case 10:
>> +		video_info->color_depth = COLOR_10;
>> +		break;
>> +	case 8:
>> +		video_info->color_depth = COLOR_8;
>> +		break;
>> +	case 6:
>> +		video_info->color_depth = COLOR_6;
>> +		break;
>> +	default:
>> +		video_info->color_depth = COLOR_8;
>> +		break;
>> +	}
>> +
>> +	if (display_info->color_formats | DRM_COLOR_FORMAT_YCRCB444)
>> +		video_info->color_space = COLOR_YCBCR444;
>> +	else if (display_info->color_formats | DRM_COLOR_FORMAT_YCRCB422)
>> +		video_info->color_space = COLOR_YCBCR422;
>> +	else if (display_info->color_formats | DRM_COLOR_FORMAT_RGB444)
>> +		video_info->color_space = COLOR_RGB;
>> +	else
>> +		video_info->color_space = COLOR_RGB;
>> +
>> +	/*
>> +	 * NOTE: those property parseing code is used for
> s/parseing/parsing/
>
> BTW, you can easily integrate spell-check to vim... It is not that I
> search for such misspellings - they are highlighted...

Wow, thanks for your remind, I have set the spell-check now.  :)

>
>> +	 * providing backward compatibility for samsung platform.
>> +	 */
>> +	of_property_read_u32(dp_node, "samsung,color-space",
>> +			     &video_info->color_space);
>> +	of_property_read_u32(dp_node, "samsung,dynamic-range",
>> +			     &video_info->dynamic_range);
>> +	of_property_read_u32(dp_node, "samsung,ycbcr-coeff",
>> +			     &video_info->ycbcr_coeff);
>> +	of_property_read_u32(dp_node, "samsung,color-depth",
>> +			     &video_info->color_depth);
>> +	of_property_read_u32(dp_node, "hsync-active-high",
>> +			     (unsigned int *)&video_info->h_sync_polarity);
>> +	of_property_read_u32(dp_node, "vsync-active-high",
>> +			     (unsigned int *)&video_info->v_sync_polarity);
>> +	of_property_read_u32(dp_node, "interlaced",
>> +			     (unsigned int *)&video_info->interlaced);
> You made assumption that the sizeof(bool) is always equal to
> sizeof(u32)... Then you cast it to pointer to unsigned int but function
> wants pointer to u32. Just for reading boolean property. There's easier
> way - of_property_read_bool. It returns bool.

Thanks, done.

>
>> +}
>> +
>>   static void analogix_dp_bridge_nop(struct drm_bridge *bridge)
>>   {
>>   	/* do nothing */
>> @@ -1091,6 +1167,7 @@ static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
>>   	.disable = analogix_dp_bridge_disable,
>>   	.pre_enable = analogix_dp_bridge_nop,
>>   	.post_disable = analogix_dp_bridge_nop,
>> +	.mode_set = analogix_dp_bridge_mode_set,
>>   	.attach = analogix_dp_bridge_attach,
>>   };
>>   
>> @@ -1121,62 +1198,24 @@ static int analogix_dp_create_bridge(struct drm_device *drm_dev,
>>   	return 0;
>>   }
>>   
>> -static struct video_info *analogix_dp_dt_parse_pdata(struct device *dev)
>> +static int analogix_dp_dt_parse_pdata(struct analogix_dp_device *dp)
>>   {
>> -	struct device_node *dp_node = dev->of_node;
>> -	struct video_info *dp_video_config;
>> -
>> -	dp_video_config = devm_kzalloc(dev, sizeof(*dp_video_config),
>> -				       GFP_KERNEL);
>> -	if (!dp_video_config)
>> -		return ERR_PTR(-ENOMEM);
>> -
>> -	dp_video_config->h_sync_polarity =
>> -		of_property_read_bool(dp_node, "hsync-active-high");
>> -
>> -	dp_video_config->v_sync_polarity =
>> -		of_property_read_bool(dp_node, "vsync-active-high");
>> -
>> -	dp_video_config->interlaced =
>> -		of_property_read_bool(dp_node, "interlaced");
>> -
>> -	if (of_property_read_u32(dp_node, "samsung,color-space",
>> -				 &dp_video_config->color_space)) {
>> -		dev_err(dev, "failed to get color-space\n");
>> -		return ERR_PTR(-EINVAL);
>> -	}
>> -
>> -	if (of_property_read_u32(dp_node, "samsung,dynamic-range",
>> -				 &dp_video_config->dynamic_range)) {
>> -		dev_err(dev, "failed to get dynamic-range\n");
>> -		return ERR_PTR(-EINVAL);
>> -	}
>> -
>> -	if (of_property_read_u32(dp_node, "samsung,ycbcr-coeff",
>> -				 &dp_video_config->ycbcr_coeff)) {
>> -		dev_err(dev, "failed to get ycbcr-coeff\n");
>> -		return ERR_PTR(-EINVAL);
>> -	}
>> -
>> -	if (of_property_read_u32(dp_node, "samsung,color-depth",
>> -				 &dp_video_config->color_depth)) {
>> -		dev_err(dev, "failed to get color-depth\n");
>> -		return ERR_PTR(-EINVAL);
>> -	}
>> +	struct device_node *dp_node = dp->dev->of_node;
>> +	struct video_info *video_config = &dp->video_info;
>>   
>>   	if (of_property_read_u32(dp_node, "samsung,link-rate",
>> -				 &dp_video_config->link_rate)) {
>> +				 &video_info->link_rate)) {
>>   		dev_err(dev, "failed to get link-rate\n");
>> -		return ERR_PTR(-EINVAL);
>> +		return -EINVAL;
>>   	}
>>   
>>   	if (of_property_read_u32(dp_node, "samsung,lane-count",
>> -				 &dp_video_config->lane_count)) {
>> +				 &video_info->lane_count)) {
>>   		dev_err(dev, "failed to get lane-count\n");
>> -		return ERR_PTR(-EINVAL);
>> +		return -EINVAL;
>>   	}
>>   
>> -	return dp_video_config;
>> +	return 0;
>>   }
>>   
>>   int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
>> @@ -1205,9 +1244,9 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
>>   	 */
>>   	dp->plat_data = plat_data;
>>   
>> -	dp->video_info = analogix_dp_dt_parse_pdata(&pdev->dev);
>> -	if (IS_ERR(dp->video_info))
>> -		return PTR_ERR(dp->video_info);
>> +	ret = analogix_dp_dt_parse_pdata(dp);
>> +	if (ret)
>> +		return ret;
>>   
>>   	dp->phy = devm_phy_get(dp->dev, "dp");
>>   	if (IS_ERR(dp->phy)) {
>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
>> index ffabbd0..6e3d5bc 100644
>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
>> @@ -154,7 +154,7 @@ struct analogix_dp_device {
>>   	unsigned int		irq;
>>   	void __iomem		*reg_base;
>>   
>> -	struct video_info	*video_info;
>> +	struct video_info	video_info;
>>   	struct link_train	link_train;
>>   	struct work_struct	hotplug_work;
>>   	struct phy		*phy;
>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
>> index b879d8c..6a643be 100644
>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
>> @@ -1084,15 +1084,15 @@ void analogix_dp_set_video_color_format(struct analogix_dp_device *dp)
>>   	u32 reg;
>>   
>>   	/* Configure the input color depth, color space, dynamic range */
>> -	reg = (dp->video_info->dynamic_range << IN_D_RANGE_SHIFT) |
>> -		(dp->video_info->color_depth << IN_BPC_SHIFT) |
>> -		(dp->video_info->color_space << IN_COLOR_F_SHIFT);
>> +	reg = (dp->video_info.dynamic_range << IN_D_RANGE_SHIFT) |
>> +		(dp->video_info.color_depth << IN_BPC_SHIFT) |
>> +		(dp->video_info.color_space << IN_COLOR_F_SHIFT);
>>   	writel(reg, dp->reg_base + ANALOGIX_DP_VIDEO_CTL_2);
>>   
>>   	/* Set Input Color YCbCr Coefficients to ITU601 or ITU709 */
>>   	reg = readl(dp->reg_base + ANALOGIX_DP_VIDEO_CTL_3);
>>   	reg &= ~IN_YC_COEFFI_MASK;
>> -	if (dp->video_info->ycbcr_coeff)
>> +	if (dp->video_info.ycbcr_coeff)
>>   		reg |= IN_YC_COEFFI_ITU709;
>>   	else
>>   		reg |= IN_YC_COEFFI_ITU601;
>> @@ -1229,17 +1229,17 @@ void analogix_dp_config_video_slave_mode(struct analogix_dp_device *dp)
>>   
>>   	reg = readl(dp->reg_base + ANALOGIX_DP_VIDEO_CTL_10);
>>   	reg &= ~INTERACE_SCAN_CFG;
>> -	reg |= (dp->video_info->interlaced << 2);
>> +	reg |= (dp->video_info.interlaced << 2);
>>   	writel(reg, dp->reg_base + ANALOGIX_DP_VIDEO_CTL_10);
>>   
>>   	reg = readl(dp->reg_base + ANALOGIX_DP_VIDEO_CTL_10);
>>   	reg &= ~VSYNC_POLARITY_CFG;
>> -	reg |= (dp->video_info->v_sync_polarity << 1);
>> +	reg |= (dp->video_info.v_sync_polarity << 1);
>>   	writel(reg, dp->reg_base + ANALOGIX_DP_VIDEO_CTL_10);
>>   
>>   	reg = readl(dp->reg_base + ANALOGIX_DP_VIDEO_CTL_10);
>>   	reg &= ~HSYNC_POLARITY_CFG;
>> -	reg |= (dp->video_info->h_sync_polarity << 0);
>> +	reg |= (dp->video_info.h_sync_polarity << 0);
>>   	writel(reg, dp->reg_base + ANALOGIX_DP_VIDEO_CTL_10);
>>   
>>   	reg = AUDIO_MODE_SPDIF_MODE | VIDEO_MODE_SLAVE_MODE;
>> diff --git a/drivers/gpu/drm/exynos/exynos_dp.c b/drivers/gpu/drm/exynos/exynos_dp.c
>> index 7e1be72..6060d2c 100644
>> --- a/drivers/gpu/drm/exynos/exynos_dp.c
>> +++ b/drivers/gpu/drm/exynos/exynos_dp.c
>> @@ -28,8 +28,13 @@
>>   
>>   #include "exynos_drm_crtc.h"
>>   
>> -#define plat_data_to_dp(pd) \
>> -		container_of(pd, struct exynos_dp_device, plat_data)
>> +#define to_dp(nm)	container_of(nm, struct exynos_dp_device, nm)
>> +
>> +struct video_info {
>> +	bool h_sync_polarity;
>> +	bool v_sync_polarity;
>> +	bool interlaced;
>> +};
>>   
>>   struct exynos_dp_device {
>>   	struct drm_encoder         encoder;
>> @@ -39,12 +44,13 @@ struct exynos_dp_device {
>>   
>>   	struct exynos_drm_panel_info priv;
>>   	struct analogix_dp_plat_data plat_data;
>> +	struct video_info            video_info;
>>   };
>>   
>>   int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data,
>>   				bool enable)
>>   {
>> -	struct exynos_dp_device *dp = plat_data_to_dp(plat_data);
>> +	struct exynos_dp_device *dp = to_dp(plat_data);
>>   	struct drm_encoder *encoder = &dp->encoder;
>>   	struct exynos_drm_crtc *crtc;
>>   
>> @@ -71,7 +77,7 @@ static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data)
>>   static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data,
>>   			       struct drm_connector *connector)
>>   {
>> -	struct exynos_dp_device *dp = plat_data_to_dp(plat_data);
>> +	struct exynos_dp_device *dp = to_dp(plat_data);
>>   	struct drm_display_mode *mode;
>>   
>>   	if (dp->plat_data.panel)
>> @@ -99,7 +105,7 @@ static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data,
>>   static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
>>   				   struct drm_bridge *bridge)
>>   {
>> -	struct exynos_dp_device *dp = plat_data_to_dp(plat_data);
>> +	struct exynos_dp_device *dp = to_dp(plat_data);
>>   	struct drm_encoder *encoder = &dp->encoder;
>>   	int ret;
>>   
>> @@ -122,6 +128,28 @@ static bool exynos_dp_mode_fixup(struct drm_encoder *encoder,
>>   				 const struct drm_display_mode *mode,
>>   				 struct drm_display_mode *adjusted_mode)
>>   {
>> +	struct exynos_dp_device *dp = to_dp(encoder);
>> +	int flags = adjusted_mode->flags;
>> +
>> +	flags &= ~(DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NHSYNC |
>> +		   DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_NVSYNC |
>> +		   DRM_MODE_FLAG_INTERLACE);
>> +
>> +	if (dp->video_info.h_sync_polarity)
>> +		flags |= DRM_MODE_FLAG_PHSYNC;
>> +	else
>> +		flags |= DRM_MODE_FLAG_NHSYNC;
>> +
>> +	if (dp->video_info.v_sync_polarity)
>> +		flags |= DRM_MODE_FLAG_PVSYNC;
>> +	else
>> +		flags |= DRM_MODE_FLAG_NVSYNC;
>> +
>> +	if (dp->video_info.interlaced)
>> +		flags |= DRM_MODE_FLAG_INTERLACE;
>> +
>> +	adjusted_mode->flags = flags;
>> +
>>   	return true;
>>   }
>>   
>> @@ -163,6 +191,22 @@ static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
>>   	return 0;
>>   }
>>   
>> +static int exynos_dp_dt_parse_video_info(struct exynos_dp_device *dp)
>> +{
>> +	struct device_node *dp_node = dp->dev->of_node;
>> +
>> +	dp->video_info.h_sync_polarity =
>> +		of_property_read_bool(dp_node, "hsync-active-high");
>> +
>> +	dp->video_info.v_sync_polarity =
>> +		of_property_read_bool(dp_node, "vsync-active-high");
>> +
>> +	dp->video_info.interlaced =
>> +		of_property_read_bool(dp_node, "interlaced");
>> +
>> +	return 0;
> Probably you wanted to follow the convention of other DT-parse functions
> but there is no need. This function cannot fail so maybe make it void?
> It would simplify a bit the code in exynos_dp_bind().

Actually, I found an mistaken here. I have parsed those two property for 
twice,
one is here, the other is analogix_dp_core.c mode_set() function.
         /*
          * NOTE: those property parseing code is used for
          * providing backward compatibility for samsung platform.
          */
         [....]
         of_property_read_u32(dp_node, "hsync-active-high",
                              (unsigned int *)&video_info->h_sync_polarity);
         of_property_read_u32(dp_node, "vsync-active-high",
                              (unsigned int *)&video_info->v_sync_polarity);
         of_property_read_u32(dp_node, "interlaced",
                              (unsigned int *)&video_info->interlaced);

And I think it would be easy to code when I achieve the backward 
compatibility
in analogix core driver. So I prefer this way :-)

Anyway, thanks,
- Yakir

> Best regards,
> Krzysztof