[PATCH] drm/rockchip: Filter out alpha formats for primary plane

[Kristian Høgsberg]

On Mon, Apr 16, 2018 at 2:59 PM Eric Anholt <eric at anholt.net> wrote:

> "Kristian H. Kristensen" <hoegsberg at gmail.com> writes:

> > Rockchip doesn't support per-pixel alpha blending for the lowest
> > window in the stack. While the hw supports restacking the windows, we
> > don't expose that in KMS, so just filter out alpha formats for the
> > primary plane.

> In discussing this for VC4, we noted that an alternative is to just set
> up the lowest plane as an RGBX format, since alpha is premultiplied and
> the background is black.

Doh, of course. Thanks Eric.

Kristian