Properly configure blending properties of given hardware layer based on
the selected pixel format. Currently only per-pixel-based alpha is possible
when respective pixel format has been selected. Configuration of global,
per-plane alpha value, color key and background color will be added later.
This patch is heavily inspired by earlier work done by Tobias Jakobi
<tjakobi@xxxxxxxxxxxxxxxxxxxxx>.
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
---
drivers/gpu/drm/exynos/exynos_mixer.c | 43 +++++++++++++++++++++++++++++++++++
drivers/gpu/drm/exynos/regs-mixer.h | 1 +
2 files changed, 44 insertions(+)
diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
index c572e271579e..ae7b122274ac 100644
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -165,6 +165,16 @@ static const u8 filter_cr_horiz_tap4[] = {
70, 59, 48, 37, 27, 19, 11, 5,
};
+static inline bool is_alpha_format(unsigned int pixel_format)
+{
+ switch (pixel_format) {
+ case DRM_FORMAT_ARGB8888:
+ return true;
+ default:
+ return false;
+ }
+}
+
static inline u32 vp_reg_read(struct mixer_resources *res, u32 reg_id)
{
return readl(res->vp_regs + reg_id);
@@ -294,6 +304,37 @@ static void vp_default_filter(struct mixer_resources *res)
filter_cr_horiz_tap4, sizeof(filter_cr_horiz_tap4));
}
+static void mixer_cfg_gfx_blend(struct mixer_context *ctx, unsigned int win,
+ bool alpha)
+{
+ struct mixer_resources *res = &ctx->mixer_res;
+ u32 val;
+
+ val = MXR_GRP_CFG_COLOR_KEY_DISABLE; /* no blank key */
+ if (alpha) {
+ /* blending based on pixel alpha */
+ val |= MXR_GRP_CFG_BLEND_PRE_MUL;
+ val |= MXR_GRP_CFG_PIXEL_BLEND_EN;
+ }
+ mixer_reg_writemask(res, MXR_GRAPHIC_CFG(win),
+ val, MXR_GRP_CFG_MISC_MASK);
+}
+
+static void mixer_cfg_vp_blend(struct mixer_context *ctx)
+{
+ struct mixer_resources *res = &ctx->mixer_res;
+ u32 val;
+
+ /*
+ * No blending at the moment since the NV12/NV21 pixelformats don't
+ * have an alpha channel. However the mixer supports a global alpha
+ * value for a layer. Once this functionality is exposed, we can
+ * support blending of the video layer through this.
+ */
+ val = 0;
+ mixer_reg_write(res, MXR_VIDEO_CFG, val);
+}
+
static void mixer_vsync_set_update(struct mixer_context *ctx, bool enable)
{
struct mixer_resources *res = &ctx->mixer_res;
@@ -519,6 +560,7 @@ static void vp_video_buffer(struct mixer_context *ctx,
mixer_cfg_scan(ctx, mode->vdisplay);
mixer_cfg_rgb_fmt(ctx, mode->vdisplay);
mixer_cfg_layer(ctx, plane->index, state->zpos + 1, true);
+ mixer_cfg_vp_blend(ctx);
mixer_run(ctx);
mixer_vsync_set_update(ctx, true);
@@ -634,6 +676,7 @@ static void mixer_graph_buffer(struct mixer_context *ctx,
mixer_cfg_scan(ctx, mode->vdisplay);
mixer_cfg_rgb_fmt(ctx, mode->vdisplay);
mixer_cfg_layer(ctx, win, state->zpos + 1, true);
+ mixer_cfg_gfx_blend(ctx, win, is_alpha_format(fb->pixel_format));
/* layer update mandatory for mixer 16.0.33.0 */
if (ctx->mxr_ver == MXR_VER_16_0_33_0 ||
diff --git a/drivers/gpu/drm/exynos/regs-mixer.h b/drivers/gpu/drm/exynos/regs-mixer.h
index dbdbc0af3358..7f22df5bf707 100644
--- a/drivers/gpu/drm/exynos/regs-mixer.h
+++ b/drivers/gpu/drm/exynos/regs-mixer.h
@@ -113,6 +113,7 @@
#define MXR_GRP_CFG_BLEND_PRE_MUL (1 << 20)
#define MXR_GRP_CFG_WIN_BLEND_EN (1 << 17)
#define MXR_GRP_CFG_PIXEL_BLEND_EN (1 << 16)
+#define MXR_GRP_CFG_MISC_MASK ((3 << 16) | (3 << 20))
#define MXR_GRP_CFG_FORMAT_VAL(x) MXR_MASK_VAL(x, 11, 8)
#define MXR_GRP_CFG_FORMAT_MASK MXR_GRP_CFG_FORMAT_VAL(~0)
#define MXR_GRP_CFG_ALPHA_VAL(x) MXR_MASK_VAL(x, 7, 0)
--
1.9.2
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