[PATCH 3/6] drm/edid: parse source physical address

[Hans Verkuil]

On 24/08/2023 15:46, Jani Nikula wrote:
> CEC needs the source physical address. Parsing it is trivial with the
> existing EDID CEA DB infrastructure.
> 
> Default to CEC_PHYS_ADDR_INVALID (0xffff) instead of 0 to cater for
> easier CEC usage.
> 
> Cc: Hans Verkuil <hverkuil-cisco at xs4all.nl>
> Cc: linux-media at vger.kernel.org
> Signed-off-by: Jani Nikula <jani.nikula at intel.com>

Reviewed-by: Hans Verkuil <hverkuil-cisco at xs4all.nl>

Regards,

	Hans

> ---
>  drivers/gpu/drm/drm_edid.c  | 5 +++++
>  include/drm/drm_connector.h | 8 ++++++++
>  2 files changed, 13 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 1dbb15439468..39dd3f694544 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -29,6 +29,7 @@
>   */
>  
>  #include <linux/bitfield.h>
> +#include <linux/cec.h>
>  #include <linux/hdmi.h>
>  #include <linux/i2c.h>
>  #include <linux/kernel.h>
> @@ -6192,6 +6193,8 @@ drm_parse_hdmi_vsdb_video(struct drm_connector *connector, const u8 *db)
>  
>  	info->is_hdmi = true;
>  
> +	info->source_physical_address = (db[4] << 8) | db[5];
> +
>  	if (len >= 6)
>  		info->dvi_dual = db[6] & 1;
>  	if (len >= 7)
> @@ -6470,6 +6473,8 @@ static void drm_reset_display_info(struct drm_connector *connector)
>  	info->vics_len = 0;
>  
>  	info->quirks = 0;
> +
> +	info->source_physical_address = CEC_PHYS_ADDR_INVALID;
>  }
>  
>  static void update_displayid_info(struct drm_connector *connector,
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index d300fde6c1a4..40a5e7acf2fa 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -816,6 +816,14 @@ struct drm_display_info {
>  	 * @quirks: EDID based quirks. Internal to EDID parsing.
>  	 */
>  	u32 quirks;
> +
> +	/**
> +	 * @source_physical_address: Source Physical Address from HDMI
> +	 * Vendor-Specific Data Block, for CEC usage.
> +	 *
> +	 * Defaults to CEC_PHYS_ADDR_INVALID (0xffff).
> +	 */
> +	u16 source_physical_address;
>  };
>  
>  int drm_display_info_set_bus_formats(struct drm_display_info *info,