[v2 04/14] drm: Parse Colorimetry data block from EDID

[Sharma, Shashank]

Regards

Shashank


On 12/12/2018 2:08 AM, Uma Shankar wrote:
> CEA 861.3 spec adds colorimetry data block for HDMI.
> Parsing the block to get the colorimetry data from
> panel.
>
> v2: Rebase
>
> Signed-off-by: Uma Shankar <uma.shankar at intel.com>
> ---
>   drivers/gpu/drm/drm_edid.c  | 24 ++++++++++++++++++++++++
>   include/drm/drm_connector.h |  2 ++
>   2 files changed, 26 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index d12b74e..344d8c1 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -3818,6 +3818,28 @@ static void fixup_detailed_cea_mode_clock(struct drm_display_mode *mode)
>   	mode->clock = clock;
>   }
>   
> +static bool cea_db_is_hdmi_colorimetry_data_block(const u8 *db)
> +{
> +	if (cea_db_tag(db) != DATA_BLOCK_EXTENDED_TAG)
> +		return false;
> +
> +	if (db[1] != COLORIMETRY_DATA_BLOCK)
> +	
Again, the COLORIMETRY_DATA_BLOCK definition should be added into this 
patch.
> 	return false;
> +
> +	return true;
> +}
> +
> +static void
> +drm_parse_colorimetry_data_block(struct drm_connector *connector, const u8 *db)
> +{
> +	struct drm_hdmi_info *info = &connector->display_info.hdmi;
> +	uint16_t len;
> +
> +	len = cea_db_payload_len(db);
Again, the return value of this function doesn't account for extended db 
tag byte, so what we are looking for is len -1
> +	info->colorimetry = db[2];
colorimetry block is actually db[2] and db[3].bit7 (which represents 
DCI-P3 space), so we probably want to make info->colorimetryuint16_t
> +}
> +
> +
>   static bool cea_db_is_hdmi_hdr_metadata_block(const u8 *db)
>   {
>   	if (cea_db_tag(db) != DATA_BLOCK_EXTENDED_TAG)
> @@ -4513,6 +4535,8 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
>   			drm_parse_y420cmdb_bitmap(connector, db);
>   		if (cea_db_is_hdmi_hdr_metadata_block(db))
>   			drm_parse_hdr_metadata_block(connector, db);
> +		if (cea_db_is_hdmi_colorimetry_data_block(db))
> +			drm_parse_colorimetry_data_block(connector, db);
>   	}
>   }
>   
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index 2ee45dc..90ce364 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -206,6 +206,8 @@ struct drm_hdmi_info {
>   
>   	/** @y420_dc_modes: bitmap of deep color support index */
>   	u8 y420_dc_modes;
> +
Please add a one line description about this variable.
> +	u8 colorimetry;
>   };
>   
>   /**
Shashank