linux-kernel - Re: [PATCH v15 17/29] drm/doc: Remove unused Broadcast RGB Property

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Date: Tue, 28 May 2024 04:02:05 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Maxime Ripard <mripard@...nel.org>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
	Daniel Vetter <daniel@...ll.ch>, Jonathan Corbet <corbet@....net>, 
	Sandy Huang <hjc@...k-chips.com>, Heiko Stübner <heiko@...ech.de>, 
	Chen-Yu Tsai <wens@...e.org>, Jernej Skrabec <jernej.skrabec@...il.com>, 
	Samuel Holland <samuel@...lland.org>, Andy Yan <andy.yan@...k-chips.com>, 
	Hans Verkuil <hverkuil@...all.nl>, Sebastian Wick <sebastian.wick@...hat.com>, 
	Ville Syrjälä <ville.syrjala@...ux.intel.com>, dri-devel@...ts.freedesktop.org, 
	linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org, linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH v15 17/29] drm/doc: Remove unused Broadcast RGB Property

On Mon, May 27, 2024 at 03:58:06PM +0200, Maxime Ripard wrote:
> The Broadcast RGB property has been documented as three separate entries
> so far, each with a different set of values.
> 
> The first one is pretty much the generic one: it's used by i915 and vc4,
> and is the one used by all the compositors.
> 
> The second one is used by the gma500 driver, and is a subset of the
> first one: it can have the values "Full" or "Limited 16:235", but lack
> the "Automatic" value.
> 
> The third one however isn't used by any driver and documents the values
> "off", "auto" and "on".
> 
> It's unclear where the last one comes from. It was first documented in
> commit 6c6a3996f2c5 ("Documentation: drm: describing drm properties
> exposed by various drivers") which adds a number of properties used by
> drivers, but without mentioning which driver was using what property.
> 
> Grepping at the 6c6a3996f2c5 commit however, it looks like no driver is
> actually using it, and a quick look at the entire kernel history doesn't
> show any match either.
> 
> At the time though, gma500 had an "audio" property used right next to
> Broadcast RGB that did have the "off", "auto" and "on" values in the
> same order.
> 
> As such, it was probably a copy/paste or scripting error back then, and
> there's never been such property used in the kernel.
> 
> Either way, it certainly hasn't been used in a decade or two so we can
> just get rid of it.
> 
> Suggested-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Signed-off-by: Maxime Ripard <mripard@...nel.org>
> ---
>  Documentation/gpu/kms-properties.csv | 1 -
>  1 file changed, 1 deletion(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>


-- 
With best wishes
Dmitry