OMAP3630: DSS2: Enable Pre-Multiplied Alpha Support

Enable dss to process color formats with pre-mulitplied alpha.
With this we can have alpha values defined for each pixel
and hence can have different blending values for each pixel.
sysfs entry has been created for this and pre-multiplied alpha
support is turned off by default.

Signed-off-by: Sudeep Basavaraj <sudeep.basavaraj@ti.com>
Signed-off-by: Rajkumar N <rajkumar.nagarajan@ti.com>
Signed-off-by: Samreen <samreen@ti.com>
Signed-off-by: Archit Taneja <archit@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>

1 files changed, 23 insertions, 7 deletions

diff --git a/drivers/video/omap2/dss/dispc.c b/drivers/video/omap2/dss/dispc.c
index 4e04a73a8ff3..54ba8d3ad317 100644
--- a/drivers/video/omap2/dss/dispc.c
+++ b/drivers/video/omap2/dss/dispc.c
@@ -773,13 +773,26 @@ static void _dispc_set_vid_size(enum omap_plane plane, int width, int height)
         dispc_write_reg(vsi_reg[plane-1], val);
 }
 
+static void _dispc_set_pre_mult_alpha(enum omap_plane plane, bool enable)
+{
+        if (!dss_has_feature(FEAT_PRE_MULT_ALPHA))
+                return;
+
+        if (!dss_has_feature(FEAT_GLOBAL_ALPHA_VID1) &&
+                plane == OMAP_DSS_VIDEO1)
+                return;
+
+        REG_FLD_MOD(dispc_reg_att[plane], enable ? 1 : 0, 28, 28);
+}
+
 static void _dispc_setup_global_alpha(enum omap_plane plane, u8 global_alpha)
 {
         if (!dss_has_feature(FEAT_GLOBAL_ALPHA))
                 return;
 
-        BUG_ON(!dss_has_feature(FEAT_GLOBAL_ALPHA_VID1) &&
-                        plane == OMAP_DSS_VIDEO1);
+        if (!dss_has_feature(FEAT_GLOBAL_ALPHA_VID1) &&
+                plane == OMAP_DSS_VIDEO1)
+                return;
 
         if (plane == OMAP_DSS_GFX)
                 REG_FLD_MOD(DISPC_GLOBAL_ALPHA, global_alpha, 7, 0);
@@ -1507,7 +1520,8 @@ static int _dispc_setup_plane(enum omap_plane plane,
                 bool ilace,
                 enum omap_dss_rotation_type rotation_type,
                 u8 rotation, int mirror,
-                u8 global_alpha)
+                u8 global_alpha,
+                u8 pre_mult_alpha)
 {
         const int maxdownscale = cpu_is_omap34xx() ? 4 : 2;
         bool five_taps = 0;
@@ -1693,8 +1707,8 @@ static int _dispc_setup_plane(enum omap_plane plane,
 
         _dispc_set_rotation_attrs(plane, rotation, mirror, color_mode);
 
-        if (plane != OMAP_DSS_VIDEO1)
-                _dispc_setup_global_alpha(plane, global_alpha);
+        _dispc_set_pre_mult_alpha(plane, pre_mult_alpha);
+        _dispc_setup_global_alpha(plane, global_alpha);
 
         return 0;
 }
@@ -3138,7 +3152,8 @@ int dispc_setup_plane(enum omap_plane plane,
                        enum omap_color_mode color_mode,
                        bool ilace,
                        enum omap_dss_rotation_type rotation_type,
-                       u8 rotation, bool mirror, u8 global_alpha)
+                       u8 rotation, bool mirror, u8 global_alpha,
+                       u8 pre_mult_alpha)
 {
         int r = 0;
 
@@ -3160,7 +3175,8 @@ int dispc_setup_plane(enum omap_plane plane,
                            color_mode, ilace,
                            rotation_type,
                            rotation, mirror,
-                           global_alpha);
+                           global_alpha,
+                           pre_mult_alpha);
 
         enable_clocks(0);