commit ebae8d07435ae91314f4a28d69b530d09c625815
author Thierry Reding <treding@nvidia.com> Wed Dec 20 09:39:14 2017 +0100
committer Thierry Reding <treding@nvidia.com> Thu Dec 21 14:55:55 2017 +0100
tree fbe41c4c436502a2f073a3c352d3b14a3886cf15
parent 4c69ac12e39d3d623686d1c421b05d604e1c6db9

drm/tegra: dc: Implement legacy blending

This implements alpha blending on legacy display controllers (Tegra20,
Tegra30 and Tegra114). While it's theoretically possible to support the
zpos property to enable userspace to specify the Z-order of each plane
individually, this is not currently supported and the same fixed Z-
order as previously defined is used.

Reverts commit 71835caa00e8 ("drm/tegra: fb: Force alpha formats") since
the opaque formats are now supported.

Reported-by: Dmitry Osipenko <digetx@gmail.com>
Fixes: 7772fdaef939 ("drm/tegra: Support ARGB and ABGR formats")
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/tegra/dc.h

diff --git a/drivers/gpu/drm/tegra/dc.h b/drivers/gpu/drm/tegra/dc.h
index e2831e9..096a81a 100644
--- a/drivers/gpu/drm/tegra/dc.h
+++ b/drivers/gpu/drm/tegra/dc.h
@@ -649,8 +649,20 @@
 #define DC_WIN_DV_CONTROL			0x70e
 
 #define DC_WIN_BLEND_NOKEY			0x70f
+#define  BLEND_WEIGHT1(x) (((x) & 0xff) << 16)
+#define  BLEND_WEIGHT0(x) (((x) & 0xff) <<  8)
+
 #define DC_WIN_BLEND_1WIN			0x710
+#define  BLEND_CONTROL_FIX    (0 << 2)
+#define  BLEND_CONTROL_ALPHA  (1 << 2)
+#define  BLEND_COLOR_KEY_NONE (0 << 0)
+#define  BLEND_COLOR_KEY_0    (1 << 0)
+#define  BLEND_COLOR_KEY_1    (2 << 0)
+#define  BLEND_COLOR_KEY_BOTH (3 << 0)
+
 #define DC_WIN_BLEND_2WIN_X			0x711
+#define  BLEND_CONTROL_DEPENDENT (2 << 2)
+
 #define DC_WIN_BLEND_2WIN_Y			0x712
 #define DC_WIN_BLEND_3WIN_XY			0x713