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Date:   Wed, 12 Aug 2020 12:33:15 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Algea Cao <algea.cao@...k-chips.com>
Cc:     a.hajda@...sung.com, kuankuan.y@...il.com, hjc@...k-chips.com,
        tzimmermann@...e.de, dri-devel@...ts.freedesktop.org,
        sam@...nborg.org, airlied@...ux.ie, heiko@...ech.de,
        jernej.skrabec@...l.net, laurent.pinchart+renesas@...asonboard.com,
        jonas@...boo.se, mripard@...nel.org, darekm@...gle.com,
        linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, cychiang@...omium.org,
        linux-kernel@...r.kernel.org, narmstrong@...libre.com,
        jbrunet@...libre.com, maarten.lankhorst@...ux.intel.com,
        daniel@...ll.ch
Subject: Re: [PATCH 4/6] drm/rockchip: dw_hdmi: Add vendor hdmi properties

Hi Algea,

Thank you for the patch.

On Wed, Aug 12, 2020 at 04:35:43PM +0800, Algea Cao wrote:
> Introduce struct dw_hdmi_property_ops in plat_data to support
> vendor hdmi property.
> 
> Implement hdmi vendor properties color_depth_property and
> hdmi_output_property to config hdmi output color depth and
> color format.
> 
> The property "hdmi_output_format", the possible value
> could be:
>          - RGB
>          - YCBCR 444
>          - YCBCR 422
>          - YCBCR 420
> 
> Default value of the property is set to 0 = RGB, so no changes if you
> don't set the property.
> 
> The property "hdmi_output_depth" possible value could be
>          - Automatic
>            This indicates prefer highest color depth, it is
>            30bit on rockcip platform.
>          - 24bit
>          - 30bit
> The default value of property is 24bit.
> 
> Signed-off-by: Algea Cao <algea.cao@...k-chips.com>
> ---
> 
>  drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c | 174 ++++++++++++++++++++
>  include/drm/bridge/dw_hdmi.h                |  22 +++
>  2 files changed, 196 insertions(+)
> 
> diff --git a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
> index 23de359a1dec..8f22d9a566db 100644
> --- a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
> +++ b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
> @@ -52,6 +52,27 @@
>  
>  #define HIWORD_UPDATE(val, mask)	(val | (mask) << 16)
>  
> +/* HDMI output pixel format */
> +enum drm_hdmi_output_type {
> +	DRM_HDMI_OUTPUT_DEFAULT_RGB, /* default RGB */
> +	DRM_HDMI_OUTPUT_YCBCR444, /* YCBCR 444 */
> +	DRM_HDMI_OUTPUT_YCBCR422, /* YCBCR 422 */
> +	DRM_HDMI_OUTPUT_YCBCR420, /* YCBCR 420 */
> +	DRM_HDMI_OUTPUT_YCBCR_HQ, /* Highest subsampled YUV */
> +	DRM_HDMI_OUTPUT_YCBCR_LQ, /* Lowest subsampled YUV */
> +	DRM_HDMI_OUTPUT_INVALID, /* Guess what ? */
> +};

Vendor-specific properties shouldn't use names starting with drm_ or
DRM_, that's for the DRM core. But this doesn't seem specific to
Rockchip at all, it should be a standard property. Additionally, new
properties need to come with a userspace implementation showing their
usage, in X.org, Weston, the Android DRM/KMS HW composer, or another
relevant upstream project (a test tool is usually not enough).

> +
> +enum dw_hdmi_rockchip_color_depth {
> +	ROCKCHIP_HDMI_DEPTH_8,
> +	ROCKCHIP_HDMI_DEPTH_10,
> +	ROCKCHIP_HDMI_DEPTH_12,
> +	ROCKCHIP_HDMI_DEPTH_16,
> +	ROCKCHIP_HDMI_DEPTH_420_10,
> +	ROCKCHIP_HDMI_DEPTH_420_12,
> +	ROCKCHIP_HDMI_DEPTH_420_16
> +};
> +
>  /**
>   * struct rockchip_hdmi_chip_data - splite the grf setting of kind of chips
>   * @lcdsel_grf_reg: grf register offset of lcdc select
> @@ -73,6 +94,12 @@ struct rockchip_hdmi {
>  	struct clk *grf_clk;
>  	struct dw_hdmi *hdmi;
>  	struct phy *phy;
> +
> +	struct drm_property *color_depth_property;
> +	struct drm_property *hdmi_output_property;
> +
> +	unsigned int colordepth;
> +	enum drm_hdmi_output_type hdmi_output;
>  };
>  
>  #define to_rockchip_hdmi(x)	container_of(x, struct rockchip_hdmi, x)
> @@ -327,6 +354,150 @@ static void dw_hdmi_rockchip_genphy_disable(struct dw_hdmi *dw_hdmi, void *data)
>  	phy_power_off(hdmi->phy);
>  }
>  
> +static const struct drm_prop_enum_list color_depth_enum_list[] = {
> +	{ 0, "Automatic" }, /* Prefer highest color depth */
> +	{ 8, "24bit" },
> +	{ 10, "30bit" },
> +};
> +
> +static const struct drm_prop_enum_list drm_hdmi_output_enum_list[] = {
> +	{ DRM_HDMI_OUTPUT_DEFAULT_RGB, "output_rgb" },
> +	{ DRM_HDMI_OUTPUT_YCBCR444, "output_ycbcr444" },
> +	{ DRM_HDMI_OUTPUT_YCBCR422, "output_ycbcr422" },
> +	{ DRM_HDMI_OUTPUT_YCBCR420, "output_ycbcr420" },
> +	{ DRM_HDMI_OUTPUT_YCBCR_HQ, "output_ycbcr_high_subsampling" },
> +	{ DRM_HDMI_OUTPUT_YCBCR_LQ, "output_ycbcr_low_subsampling" },
> +	{ DRM_HDMI_OUTPUT_INVALID, "invalid_output" },
> +};
> +
> +static void
> +dw_hdmi_rockchip_attach_properties(struct drm_connector *connector,
> +				   unsigned int color, int version,
> +				   void *data)
> +{
> +	struct rockchip_hdmi *hdmi = (struct rockchip_hdmi *)data;
> +	struct drm_property *prop;
> +
> +	switch (color) {
> +	case MEDIA_BUS_FMT_RGB101010_1X30:
> +		hdmi->hdmi_output = DRM_HDMI_OUTPUT_DEFAULT_RGB;
> +		hdmi->colordepth = 10;
> +		break;
> +	case MEDIA_BUS_FMT_YUV8_1X24:
> +		hdmi->hdmi_output = DRM_HDMI_OUTPUT_YCBCR444;
> +		hdmi->colordepth = 8;
> +		break;
> +	case MEDIA_BUS_FMT_YUV10_1X30:
> +		hdmi->hdmi_output = DRM_HDMI_OUTPUT_YCBCR444;
> +		hdmi->colordepth = 10;
> +		break;
> +	case MEDIA_BUS_FMT_UYVY10_1X20:
> +		hdmi->hdmi_output = DRM_HDMI_OUTPUT_YCBCR422;
> +		hdmi->colordepth = 10;
> +		break;
> +	case MEDIA_BUS_FMT_UYVY8_1X16:
> +		hdmi->hdmi_output = DRM_HDMI_OUTPUT_YCBCR422;
> +		hdmi->colordepth = 8;
> +		break;
> +	case MEDIA_BUS_FMT_UYYVYY8_0_5X24:
> +		hdmi->hdmi_output = DRM_HDMI_OUTPUT_YCBCR420;
> +		hdmi->colordepth = 8;
> +		break;
> +	case MEDIA_BUS_FMT_UYYVYY10_0_5X30:
> +		hdmi->hdmi_output = DRM_HDMI_OUTPUT_YCBCR420;
> +		hdmi->colordepth = 10;
> +		break;
> +	default:
> +		hdmi->hdmi_output = DRM_HDMI_OUTPUT_DEFAULT_RGB;
> +		hdmi->colordepth = 8;
> +	}
> +
> +	prop = drm_property_create_enum(connector->dev, 0,
> +					"hdmi_output_depth",
> +					color_depth_enum_list,
> +					ARRAY_SIZE(color_depth_enum_list));
> +	if (prop) {
> +		hdmi->color_depth_property = prop;
> +		drm_object_attach_property(&connector->base, prop, 0);
> +	}
> +
> +	prop = drm_property_create_enum(connector->dev, 0, "hdmi_output_format",
> +					drm_hdmi_output_enum_list,
> +					ARRAY_SIZE(drm_hdmi_output_enum_list));
> +	if (prop) {
> +		hdmi->hdmi_output_property = prop;
> +		drm_object_attach_property(&connector->base, prop, 0);
> +	}
> +}
> +
> +static void
> +dw_hdmi_rockchip_destroy_properties(struct drm_connector *connector,
> +				    void *data)
> +{
> +	struct rockchip_hdmi *hdmi = (struct rockchip_hdmi *)data;
> +
> +	if (hdmi->color_depth_property) {
> +		drm_property_destroy(connector->dev,
> +				     hdmi->color_depth_property);
> +		hdmi->color_depth_property = NULL;
> +	}
> +
> +	if (hdmi->hdmi_output_property) {
> +		drm_property_destroy(connector->dev,
> +				     hdmi->hdmi_output_property);
> +		hdmi->hdmi_output_property = NULL;
> +	}
> +}
> +
> +static int
> +dw_hdmi_rockchip_set_property(struct drm_connector *connector,
> +			      struct drm_connector_state *state,
> +			      struct drm_property *property,
> +			      u64 val,
> +			      void *data)
> +{
> +	struct rockchip_hdmi *hdmi = (struct rockchip_hdmi *)data;
> +
> +	if (property == hdmi->color_depth_property) {
> +		hdmi->colordepth = val;
> +		return 0;
> +	} else if (property == hdmi->hdmi_output_property) {
> +		hdmi->hdmi_output = val;
> +		return 0;
> +	}
> +
> +	DRM_ERROR("failed to set rockchip hdmi connector property\n");
> +	return -EINVAL;
> +}
> +
> +static int
> +dw_hdmi_rockchip_get_property(struct drm_connector *connector,
> +			      const struct drm_connector_state *state,
> +			      struct drm_property *property,
> +			      u64 *val,
> +			      void *data)
> +{
> +	struct rockchip_hdmi *hdmi = (struct rockchip_hdmi *)data;
> +
> +	if (property == hdmi->color_depth_property) {
> +		*val = hdmi->colordepth;
> +		return 0;
> +	} else if (property == hdmi->hdmi_output_property) {
> +		*val = hdmi->hdmi_output;
> +		return 0;
> +	}
> +
> +	DRM_ERROR("failed to get rockchip hdmi connector property\n");
> +	return -EINVAL;
> +}
> +
> +static const struct dw_hdmi_property_ops dw_hdmi_rockchip_property_ops = {
> +	.attach_properties	= dw_hdmi_rockchip_attach_properties,
> +	.destroy_properties	= dw_hdmi_rockchip_destroy_properties,
> +	.set_property		= dw_hdmi_rockchip_set_property,
> +	.get_property		= dw_hdmi_rockchip_get_property,
> +};
> +
>  static void dw_hdmi_rk3228_setup_hpd(struct dw_hdmi *dw_hdmi, void *data)
>  {
>  	struct rockchip_hdmi *hdmi = (struct rockchip_hdmi *)data;
> @@ -511,6 +682,9 @@ static int dw_hdmi_rockchip_bind(struct device *dev, struct device *master,
>  	hdmi->dev = &pdev->dev;
>  	hdmi->chip_data = plat_data->phy_data;
>  	plat_data->phy_data = hdmi;
> +
> +	plat_data->property_ops = &dw_hdmi_rockchip_property_ops;
> +
>  	encoder = &hdmi->encoder;
>  
>  	encoder->possible_crtcs = drm_of_find_possible_crtcs(drm, dev->of_node);
> diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
> index ea34ca146b82..dc561ebe7a9b 100644
> --- a/include/drm/bridge/dw_hdmi.h
> +++ b/include/drm/bridge/dw_hdmi.h
> @@ -6,6 +6,7 @@
>  #ifndef __DW_HDMI__
>  #define __DW_HDMI__
>  
> +#include <drm/drm_property.h>
>  #include <sound/hdmi-codec.h>
>  
>  struct drm_display_info;
> @@ -123,6 +124,24 @@ struct dw_hdmi_phy_ops {
>  	void (*setup_hpd)(struct dw_hdmi *hdmi, void *data);
>  };
>  
> +struct dw_hdmi_property_ops {
> +	void (*attach_properties)(struct drm_connector *connector,
> +				  unsigned int color, int version,
> +				  void *data);
> +	void (*destroy_properties)(struct drm_connector *connector,
> +				   void *data);
> +	int (*set_property)(struct drm_connector *connector,
> +			    struct drm_connector_state *state,
> +			    struct drm_property *property,
> +			    u64 val,
> +			    void *data);
> +	int (*get_property)(struct drm_connector *connector,
> +			    const struct drm_connector_state *state,
> +			    struct drm_property *property,
> +			    u64 *val,
> +			    void *data);
> +};
> +
>  struct dw_hdmi_plat_data {
>  	struct regmap *regm;
>  
> @@ -141,6 +160,9 @@ struct dw_hdmi_plat_data {
>  					   const struct drm_display_info *info,
>  					   const struct drm_display_mode *mode);
>  
> +	/* Vendor Property support */
> +	const struct dw_hdmi_property_ops *property_ops;
> +
>  	/* Vendor PHY support */
>  	const struct dw_hdmi_phy_ops *phy_ops;
>  	const char *phy_name;

-- 
Regards,

Laurent Pinchart

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