Re: [PATCH 3/6] drm/bridge: display-connector: allow YCbCr 420 for HDMI and DP

[Neil Armstrong <neil.armstrong@linaro.org>]

On 18/10/2024 23:49, Dmitry Baryshkov wrote:
> Allow YCbCr 420 output for HDMI and DisplayPort connectors. Other
> bridges in the chain still might limit YCbCr 420 support on the
> corresponding connector.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
>   drivers/gpu/drm/bridge/display-connector.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bridge/display-connector.c b/drivers/gpu/drm/bridge/display-connector.c
> index ab8e00baf3f1..aab9ce7be94c 100644
> --- a/drivers/gpu/drm/bridge/display-connector.c
> +++ b/drivers/gpu/drm/bridge/display-connector.c
> @@ -270,6 +270,10 @@ static int display_connector_probe(struct platform_device *pdev)
>   	/* All the supported connector types support interlaced modes. */
>   	conn->bridge.interlace_allowed = true;
>   
> +	if (type == DRM_MODE_CONNECTOR_HDMIA ||
> +	    type == DRM_MODE_CONNECTOR_DisplayPort)
> +		conn->bridge.ycbcr_420_allowed = true;
> +
>   	/* Get the optional connector label. */
>   	of_property_read_string(pdev->dev.of_node, "label", &label);
>   
> 

I think we should make sure all HDMI bridges can filter out 420 before
landing this, no ?

Neil