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drm/sun4i: backend: Support alpha property on lowest plane

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[ Upstream commit e359c70462d2a82aae80274d027351d38792dde6 ]

Unlike what we previously thought, only the per-pixel alpha is broken on
the lowest plane and the per-plane alpha isn't. Remove the check on the
alpha property being set on the lowest plane to reject a mode.

Fixes: dcf496a6a6 ("drm/sun4i: sun4i: Introduce a quirk for lowest plane alpha support")
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Cc: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200728134810.883457-1-maxime@cerno.tech
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Maxime Ripard 2020-07-28 15:48:09 +02:00 • committed by Greg Kroah-Hartman
commit f3c982d8e6
1 changed files with 1 additions and 2 deletions
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3
drivers/gpu/drm/sun4i/sun4i_backend.c
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@ -589,8 +589,7 @@ static int sun4i_backend_atomic_check(struct sunxi_engine *engine,
/* We can't have an alpha plane at the lowest position */
if (!backend->quirks->supports_lowest_plane_alpha &&
(plane_states[0]->fb->format->has_alpha ||
(plane_states[0]->alpha != DRM_BLEND_ALPHA_OPAQUE)))
(plane_states[0]->alpha != DRM_BLEND_ALPHA_OPAQUE))
return -EINVAL;
for (i = 1; i < num_planes; i++) {