Hi Hans, On Thu, Oct 19, 2023 at 10:26:40AM +0200, Hans Verkuil wrote: > Hi Maxime, > > On 19/10/2023 10:02, Maxime Ripard wrote: > > Hi, > > > > On Wed, Oct 11, 2023 at 03:23:18PM +0200, Daniel Vetter wrote: > >> On Mon, 6 Mar 2023 at 11:49, Maxime Ripard <max...@cerno.tech> wrote: > >>> > >>> From: Dave Stevenson <dave.steven...@raspberrypi.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.steven...@raspberrypi.com> > >>> Signed-off-by: Maxime Ripard <max...@cerno.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-v2-3-17932dadd...@kernel.org/ > > > > Maxime > > I've pasted a snippet from that patch below for a quick review: > > > /** > > * DOC: HDMI connector properties > > * > > + * Broadcast RGB (HDMI Specific): > > Full vs Limited is actually not HDMI specific, DisplayPort can signal this as > well for whatever it is worth.
Sure, what I (and the original patch I guess) meant is that it's only ever used on HDMI connectors these days. If that ever changes, then we can update the doc. > > + * Indicates the RGB Range (Full vs Limited) used. > > RGB Range -> RGB Quantization Range > > > + * > > + * The value of this property can be one of the following: > > + * > > + * Automatic: > > + * RGB Range is selected automatically based on the mode > > + * according to the HDMI specifications. > > + * > > + * Full: > > + * Full RGB Range is forced. > > + * > > + * Limited 16:235: > > It is very unfortunate that this is called "Limited 16:235" instead of just > "Limited" > since for color component bit depths > 8 these values are different. > > I have no idea if it is possible to add an alias "Limited" that you can use > instead. > In any case, this should document that it works just as well for higher bit > depths, > but with different limits. I had a look and it doesn't look like the property infrastructure can deal with aliases. I'll add something in the doc Thanks! Maxime
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