On Fri, 1 Mar 2024 13:12:02 +0100 Maxime Ripard <mripard@xxxxxxxxxx> wrote: > On Fri, Mar 01, 2024 at 12:29:41PM +0100, Sebastian Wick wrote: > > On Fri, Mar 01, 2024 at 11:30:56AM +0100, Maxime Ripard wrote: > > > 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 > > > > Sure, this is one valid strategy for the automatic behavior of YCbCr. > > Drivers could also always send an InfoFrame to ensure full range where > > possible. The point here is that this property shall not affect YCbCr > > output formats! > > > > Maybe it's even better to say "driver specific" instead of "automatic". > > Honestly, I'm not sure what you want from me here. Ville and you > insisted on the previous version to document what i915 is doing and to > follow whatever the behaviour was, and that we shouldn't spend time > improving the property. Fine, I did that. > > But now, you want me to ... improve the property? Just drop the "and the output will use a limited quantization range" part. Thanks, pq
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