On Fri, Feb 09, 2024 at 09:30:46PM +0100, Sebastian Wick wrote: > On Fri, Feb 02, 2024 at 04:49:04PM +0100, Maxime Ripard wrote: > > Hi Sebastian, > > > > On Mon, Jan 15, 2024 at 03:33:08PM +0100, Sebastian Wick wrote: > > > > /** > > > > * DOC: HDMI connector properties > > > > * > > > > + * Broadcast RGB > > > > + * Indicates the RGB Quantization Range (Full vs Limited) used. > > > > + * Infoframes will be generated according to that value. > > > > + * > > > > + * 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: > > > > + * Limited RGB Range is forced. Unlike the name suggests, > > > > + * this works for any number of bits-per-component. > > > > + * > > > > + * Drivers can set up this property by calling > > > > + * drm_connector_attach_broadcast_rgb_property(). > > > > + * > > > > > > This is a good time to document this in more detail. There might be two > > > different things being affected: > > > > > > 1. The signalling (InfoFrame/SDP/...) > > > 2. The color pipeline processing > > > > > > All values of Broadcast RGB always affect the color pipeline processing > > > such that a full-range input to the CRTC is converted to either full- or > > > limited-range, depending on what the monitor is supposed to accept. > > > > > > When automatic is selected, does that mean that there is no signalling, > > > or that the signalling matches what the monitor is supposed to accept > > > according to the spec? Also, is this really HDMI specific? > > > > > > When full or limited is selected and the monitor doesn't support the > > > signalling, what happens? > > > > Leaving the YCbCr vs RGB discussion aside, would this be better ? > > Yes, it is. Thanks. Great, it'll be in the next version. > We do have to resolve the YCbCr vs RGB issue though. > > > * 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 > > Ah, another thing no note here is that the CRTC as configured by user > space must always produce full range pixels. Added too Thanks
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