[Intel-gfx] [RFC] drm/i915: Restrict legacy color key ioctl to pre-gen12

[Chris Wilson]

Quoting Matt Roper (2020-01-14 22:45:08)
> Since gen12 platform support isn't finalized yet, let's kill off the
> legacy color key ioctl for this platform; there's no userspace today
> that can run on this platform that utilizes this legacy ioctl, so we can
> safely kill it now before it becomes ABI.
> 
> Color key functionality never got integrated into the property / atomic
> interface, and the only known open source consumer was the Intel DDX
> which was never updated to run on platforms beyond gen9.  If color
> keying is desired going forward, it should really be exposed as a
> property so that it can be applied atomically with other display updates
> (and should probably be standardized in a way all drivers can choose to
> support rather than being i915-specific).

But it does run on those platforms and exposes the sprite plane via Xv.
-Chris