linux-kernel - Re: [PATCH v7 21/36] drm/connector: hdmi: Add Broadcast RGB property

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Date: Fri, 1 Mar 2024 11:30:56 +0100
From: Maxime Ripard <mripard@...nel.org>
To: Sebastian Wick <sebastian.wick@...hat.com>
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>, Hans Verkuil <hverkuil@...all.nl>, 
	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, 
	Dave Stevenson <dave.stevenson@...pberrypi.com>
Subject: Re: [PATCH v7 21/36] drm/connector: hdmi: Add Broadcast RGB property

On Thu, Feb 29, 2024 at 08:47:26PM +0100, Sebastian Wick wrote:
> > @@ -1708,6 +1731,39 @@ EXPORT_SYMBOL(drm_connector_attach_dp_subconnector_property);
> >  /**
> >   * DOC: HDMI connector properties
> >   *
> > + * Broadcast RGB (HDMI specific)
> > + *      Indicates the Quantization Range (Full vs Limited) used. The color
> > + *      processing pipeline will be adjusted to match the value of the
> > + *      property, and the Infoframes will be generated and sent accordingly.
> > + *
> > + *      This property is only relevant if the HDMI output format is RGB. If
> > + *      it's one of the YCbCr variant, it will be ignored and the output will
> > + *      use a limited quantization range.
> 
> Uh, maybe just say that the quantization range is selected automatically
> in case a YCbCr output format is in use. I'm not sure every YCbCr
> variant requires limited and even if it does, new formats could change
> this.

I documented what i915 is doing:
https://elixir.bootlin.com/linux/latest/source/drivers/gpu/drm/i915/display/intel_hdmi.c#L2143

Maxime