[PATCH] drm/vc4: Fix the "no scaling" case on multi-planar YUV formats

[Boris Brezillon]

On Fri, 27 Jul 2018 13:55:03 -0700
Eric Anholt <eric at anholt.net> wrote:

> Boris Brezillon <boris.brezillon at bootlin.com> writes:
> 
> > When there's no scaling requested ->is_unity should be true no matter
> > the format.
> >
> > Also, when no scaling is requested and we have a multi-planar YUV
> > format, we should leave ->y_scaling[0] to VC4_SCALING_NONE and only
> > set ->x_scaling[0] to VC4_SCALING_PPF.
> >
> > Doing this fixes an hardly visible artifact (seen when using modetest
> > and a rather big overlay plane in YUV420).
> >
> > Fixes: fc04023fafec ("drm/vc4: Add support for YUV planes.")
> > Cc: <stable at vger.kernel.org>
> > Signed-off-by: Boris Brezillon <boris.brezillon at bootlin.com>  
> 
> Reviewed-by: Eric Anholt <eric at anholt.net>

Queued to drm-misc-fixes.