linux-kernel - Re: [PATCH v4 1/2] drm/vc4: Add CTM support

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Message-ID: <87fu3l4uti.fsf@anholt.net>
Date:   Mon, 23 Apr 2018 11:54:49 -0700
From:   Eric Anholt <eric@...olt.net>
To:     Stefan Schake <stschake@...il.com>
Cc:     airlied@...ux.ie, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Stefan Schake <stschake@...il.com>
Subject: Re: [PATCH v4 1/2] drm/vc4: Add CTM support

Stefan Schake <stschake@...il.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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