linux-kernel - Re: [PATCH v3 3/9] drm/vc4: hdmi: Add Broadcast RGB property to allow override of RGB range

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Message-ID: <fwcn3vlgxq5uygi32pyjuktj62wa7zvdgu7xxlpqr7an3kjn7i@25axhlrrkk6z>
Date:   Thu, 19 Oct 2023 10:02:46 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Daniel Vetter <daniel@...ll.ch>
Cc:     Emma Anholt <emma@...olt.net>, David Airlie <airlied@...il.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Hans Verkuil <hverkuil@...all.nl>
Subject: Re: [PATCH v3 3/9] drm/vc4: hdmi: Add Broadcast RGB property to
 allow override of RGB range

Hi,

On Wed, Oct 11, 2023 at 03:23:18PM +0200, Daniel Vetter wrote:
> On Mon, 6 Mar 2023 at 11:49, Maxime Ripard <maxime@...no.tech> wrote:
> >
> > From: Dave Stevenson <dave.stevenson@...pberrypi.com>
> >
> > Copy Intel's "Broadcast RGB" property semantics to add manual override
> > of the HDMI pixel range for monitors that don't abide by the content
> > of the AVI Infoframe.
> >
> > Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
> > Signed-off-by: Maxime Ripard <maxime@...no.tech>
> 
> Stumbled over this grepping around, but would have been nice to lift
> this into drm code and document the property. It's one of the legacy
> ones from the table of horrors after all ...
> 
> Shouldn't be an uapi problem because it's copypasted to much, just not great.

We already discussed it on IRC, but just for the record I have a current
series that should address exactly that:

https://lore.kernel.org/dri-devel/20230920-kms-hdmi-connector-state-v2-3-17932daddd7d@kernel.org/

Maxime

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