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drm/fsl-dcu: fix alpha blending 

Fix alpha blending by enabling alpha blending for the whole frame if
a color mode with alpha channel is selected (DRM_FORMAT_ARGB*). Also
support color modes without alpha channel (DRM_FORMAT_XRGB*) by just
not enabling alpha blending on layer level.

Signed-off-by: Stefan Agner <stefan@agner.ch>
This commit is contained in:
Stefan Agner 2015-11-18 14:47:35 -08:00
parent 638c93f619
commit 69855819c7
2 changed files with 23 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.h
View File

@ -133,7 +133,9 @@
#define DCU_LAYER_RLE_EN BIT(15)
#define DCU_LAYER_LUOFFS(x) ((x) << 4)
#define DCU_LAYER_BB_ON BIT(2)
#define DCU_LAYER_AB(x) (x)
#define DCU_LAYER_AB_NONE 0
#define DCU_LAYER_AB_CHROMA_KEYING 1
#define DCU_LAYER_AB_WHOLE_FRAME 2
#define DCU_LAYER_CKMAX_R(x) ((x) << 16)
#define DCU_LAYER_CKMAX_G(x) ((x) << 8)

31
drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c
View File

@ -47,8 +47,11 @@ static int fsl_dcu_drm_plane_atomic_check(struct drm_plane *plane,
switch (fb->pixel_format) {
case DRM_FORMAT_RGB565:
case DRM_FORMAT_RGB888:
case DRM_FORMAT_XRGB8888:
case DRM_FORMAT_ARGB8888:
case DRM_FORMAT_BGRA4444:
case DRM_FORMAT_XRGB4444:
case DRM_FORMAT_ARGB4444:
case DRM_FORMAT_XRGB1555:
case DRM_FORMAT_ARGB1555:
case DRM_FORMAT_YUV422:
return 0;
@ -81,7 +84,7 @@ static void fsl_dcu_drm_plane_atomic_update(struct drm_plane *plane,
struct drm_plane_state *state = plane->state;
struct drm_framebuffer *fb = plane->state->fb;
struct drm_gem_cma_object *gem;
unsigned int alpha, bpp;
unsigned int alpha = DCU_LAYER_AB_NONE, bpp;
int index;
if (!fb)
@ -96,27 +99,30 @@ static void fsl_dcu_drm_plane_atomic_update(struct drm_plane *plane,
switch (fb->pixel_format) {
case DRM_FORMAT_RGB565:
bpp = FSL_DCU_RGB565;
alpha = 0xff;
break;
case DRM_FORMAT_RGB888:
bpp = FSL_DCU_RGB888;
alpha = 0xff;
break;
case DRM_FORMAT_ARGB8888:
alpha = DCU_LAYER_AB_WHOLE_FRAME;
/* fall-through */
case DRM_FORMAT_XRGB8888:
bpp = FSL_DCU_ARGB8888;
alpha = 0xff;
break;
case DRM_FORMAT_BGRA4444:
case DRM_FORMAT_ARGB4444:
alpha = DCU_LAYER_AB_WHOLE_FRAME;
/* fall-through */
case DRM_FORMAT_XRGB4444:
bpp = FSL_DCU_ARGB4444;
alpha = 0xff;
break;
case DRM_FORMAT_ARGB1555:
alpha = DCU_LAYER_AB_WHOLE_FRAME;
/* fall-through */
case DRM_FORMAT_XRGB1555:
bpp = FSL_DCU_ARGB1555;
alpha = 0xff;
break;
case DRM_FORMAT_YUV422:
bpp = FSL_DCU_YUV422;
alpha = 0xff;
break;
default:
return;
@ -132,9 +138,9 @@ static void fsl_dcu_drm_plane_atomic_update(struct drm_plane *plane,
DCU_CTRLDESCLN(index, 3), gem->paddr);
regmap_write(fsl_dev->regmap, DCU_CTRLDESCLN(index, 4),
DCU_LAYER_EN |
DCU_LAYER_TRANS(alpha) |
DCU_LAYER_TRANS(0xff) |
DCU_LAYER_BPP(bpp) |
DCU_LAYER_AB(0));
alpha);
regmap_write(fsl_dev->regmap, DCU_CTRLDESCLN(index, 5),
DCU_LAYER_CKMAX_R(0xFF) |
DCU_LAYER_CKMAX_G(0xFF) |
@ -202,8 +208,11 @@ static const struct drm_plane_funcs fsl_dcu_drm_plane_funcs = {
static const u32 fsl_dcu_drm_plane_formats[] = {
DRM_FORMAT_RGB565,
DRM_FORMAT_RGB888,
DRM_FORMAT_XRGB8888,
DRM_FORMAT_ARGB8888,
DRM_FORMAT_XRGB4444,
DRM_FORMAT_ARGB4444,
DRM_FORMAT_XRGB1555,
DRM_FORMAT_ARGB1555,
DRM_FORMAT_YUV422,
};