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

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Message-ID: <28fb5aed-0387-4c16-96fb-c2c23ae315b0@linaro.org>
Date: Mon, 21 Oct 2024 09:29:54 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 Andrzej Hajda <andrzej.hajda@...el.com>, Robert Foss <rfoss@...nel.org>,
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>,
 Sean Paul <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org
Subject: Re: [PATCH 3/6] drm/bridge: display-connector: allow YCbCr 420 for
 HDMI and DP

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@...aro.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