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drm/sun4i: sun4i: Introduce a quirk for lowest plane alpha support

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Not all sunxi platforms with the first version of the Display Engine
support an alpha component on the plane with the lowest z position
(as in: lowest z-pos), that gets blended with the background color.

In particular, the A13 is known to have this limitation. However, it was
recently discovered that the A20 and A33 are capable of having alpha on
their lowest plane.

Thus, this introduces a specific quirk to indicate such support,
per-platform. Since this was not tested on sun4i and sun6i platforms, a
conservative approach is kept and this feature is not supported.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180719080838.31598-2-paul.kocialkowski@bootlin.com
This commit is contained in:
Paul Kocialkowski
2018-07-19 10:08:38 +02:00
committed by Maxime Ripard
parent e527cd9e48
commit dcf496a6a6
2 changed files with 28 additions and 15 deletions
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1
drivers/gpu/drm/sun4i/sun4i_backend.h
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@@ -167,7 +167,6 @@
#define SUN4I_BACKEND_PIPE_OFF(p) (0x5000 + (0x400 * (p)))
#define SUN4I_BACKEND_NUM_LAYERS 4
#define SUN4I_BACKEND_NUM_ALPHA_LAYERS 1
#define SUN4I_BACKEND_NUM_FRONTEND_LAYERS 1
#define SUN4I_BACKEND_NUM_YUV_PLANES 1