Re: [PATCH v2 04/11] drm: parse ycbcr 420 deep color information

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Tue, May 30, 2017 at 05:43:43PM +0530, Shashank Sharma wrote:
> CEA-861-F spec adds ycbcr420 deep color support information
> in hf-vsdb block. This patch extends the existing hf-vsdb parsing
> function by adding parsing of ycbcr420 deep color support from the
> EDID and adding it into display information stored.
> 
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Cc: Jose Abreu <joabreu@synopsys.com>
> Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
> ---
>  drivers/gpu/drm/drm_edid.c  | 15 +++++++++++++++
>  include/drm/drm_connector.h |  3 +++
>  include/drm/drm_edid.h      |  5 +++++
>  3 files changed, 23 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index ce86528..50fa96e 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -4142,6 +4142,19 @@ drm_default_rgb_quant_range(const struct drm_display_mode *mode)
>  }
>  EXPORT_SYMBOL(drm_default_rgb_quant_range);
>  
> +static void drm_parse_ycbcr420_deep_color_info(struct drm_connector *connector,
> +					     const u8 *db)
> +{
> +	struct drm_hdmi_info *info = &connector->display_info.hdmi;
> +
> +	if (db[7] & DRM_EDID_YCBCR420_DC_48)
> +		info->ycbcr420_dc_modes |= DRM_EDID_YCBCR420_DC_48;
> +	if (db[7] & DRM_EDID_YCBCR420_DC_36)
> +		info->ycbcr420_dc_modes |= DRM_EDID_YCBCR420_DC_36;
> +	if (db[7] & DRM_EDID_YCBCR420_DC_30)
> +		info->ycbcr420_dc_modes |= DRM_EDID_YCBCR420_DC_30;
> +}
> +
>  static void drm_parse_hdmi_forum_vsdb(struct drm_connector *connector,
>  				 const u8 *hf_vsdb)
>  {
> @@ -4182,6 +4195,8 @@ static void drm_parse_hdmi_forum_vsdb(struct drm_connector *connector,
>  				scdc->scrambling.low_rates = true;
>  		}
>  	}
> +
> +	drm_parse_ycbcr420_deep_color_info(connector, hf_vsdb);
>  }
>  
>  static void drm_parse_hdmi_deep_color_info(struct drm_connector *connector,
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index 07b10ab..49cc38c 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -148,6 +148,9 @@ struct drm_hdmi_info {
>  
>  	/** @ycbcr420_vcb_map: bitmap of SVD index, to extraxt vcb modes */
>  	u64 ycbcr420_vcb_map;
> +
> +	/** @ycbcr420_dc_modes: bitmap of deep color support index */
> +	u8 ycbcr420_dc_modes;

We seem to be wasting quite a few bits by reusing the EDID bit
definition directly. Maybe we should consider packing these better?
But I suppose we can look into that later.

>  };
>  
>  /**
> diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
> index c07eb81..a4d174e7 100644
> --- a/include/drm/drm_edid.h
> +++ b/include/drm/drm_edid.h
> @@ -213,6 +213,11 @@ struct detailed_timing {
>  #define DRM_EDID_HDMI_DC_30               (1 << 4)
>  #define DRM_EDID_HDMI_DC_Y444             (1 << 3)
>  
> +/* YCBCR 420 deep color modes */
> +#define DRM_EDID_YCBCR420_DC_48		  (1 << 6)
> +#define DRM_EDID_YCBCR420_DC_36		  (1 << 5)
> +#define DRM_EDID_YCBCR420_DC_30		  (1 << 4)
> +
>  /* ELD Header Block */
>  #define DRM_ELD_HEADER_BLOCK_SIZE	4
>  
> -- 
> 2.7.4

-- 
Ville Syrjälä
Intel OTC
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