[PATCH v4 1/2] drm/vc4: Add CTM support

[Eric Anholt]

Stefan Schake <stschake at gmail.com> writes:

> The hardware has a single block for applying a CTM prior to gamma lut.
> It can be fed with pixels from one of our CRTC at a time and uses a
> matrix with S0.9 scalars. Use private atomic state to reject attempts
> from userland to apply CTM for more than one CRTC at a time and reject
> matrices with scalars that we can't approximate without integer bits.

Looks good!  I think you got all the transition cases we were concerned
about before.

Reviewed and applied these two to drm-misc-next.  Thanks!
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