linux-kernel - Re: [PATCH v5 02/17] drm: Add new general DRM property "color format"

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Message-ID: <20251209-gifted-coyote-of-endurance-b81bf5@houat>
Date: Tue, 9 Dec 2025 15:11:19 +0100
From: Maxime Ripard <mripard@...nel.org>
To: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
Cc: Harry Wentland <harry.wentland@....com>, Leo Li <sunpeng.li@....com>, 
	Rodrigo Siqueira <siqueira@...lia.com>, Alex Deucher <alexander.deucher@....com>, 
	Christian König <christian.koenig@....com>, David Airlie <airlied@...il.com>, 
	Simona Vetter <simona@...ll.ch>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Thomas Zimmermann <tzimmermann@...e.de>, Andrzej Hajda <andrzej.hajda@...el.com>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, 
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>, Jonas Karlman <jonas@...boo.se>, 
	Jernej Skrabec <jernej.skrabec@...il.com>, Sandy Huang <hjc@...k-chips.com>, 
	Heiko Stübner <heiko@...ech.de>, Andy Yan <andy.yan@...k-chips.com>, 
	Jani Nikula <jani.nikula@...ux.intel.com>, Rodrigo Vivi <rodrigo.vivi@...el.com>, 
	Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>, Tvrtko Ursulin <tursulin@...ulin.net>, 
	Dmitry Baryshkov <lumag@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, 
	Rob Herring <robh@...nel.org>, kernel@...labora.com, amd-gfx@...ts.freedesktop.org, 
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org, 
	intel-gfx@...ts.freedesktop.org, intel-xe@...ts.freedesktop.org, 
	Andri Yngvason <andri@...vason.is>, Werner Sembach <wse@...edocomputers.com>, 
	Marius Vlad <marius.vlad@...labora.com>
Subject: Re: [PATCH v5 02/17] drm: Add new general DRM property "color format"

Hi,

On Fri, Nov 28, 2025 at 10:05:38PM +0100, Nicolas Frattaroli wrote:
> From: Andri Yngvason <andri@...vason.is>
> 
> Add a new general DRM property named "color format" which can be used by
> userspace to request the display driver to output a particular color
> format.
> 
> Possible options are:
>     - auto (setup by default, driver internally picks the color format)

I'm not entirely sure that's how we should document it. i915, amdgpu,
and every driver using the hdmi helpers uses the same algorithm: first
try with RGB, then fallback to YUV420 if it doesn't work.

I think we should document that, and every driver exposing this property
should behave that way. It's going to be a mess otherwise.

Maxime

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