[PATCH 2/3] media: vsp1: add blend mode support

[Takanari Hayama]

To support DRM blend mode in R-Car DU driver, we must add blend mode
support in VSP1. Although VSP1 hardware is capable to support all blend
mode defined in DRM, the current R-Car DU driver implicitly supports
DRM_MODE_BLEND_COVERAGE only.

We add a new property to vsp1_du_atomic_config, so that R-Car DU driver
can pass the desired blend mode.

Signed-off-by: Takanari Hayama <taki at igel.co.jp>
---
 drivers/media/platform/renesas/vsp1/vsp1_drm.c | 11 +++++++++++
 include/media/vsp1.h                           | 14 ++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/drivers/media/platform/renesas/vsp1/vsp1_drm.c b/drivers/media/platform/renesas/vsp1/vsp1_drm.c
index 9ec3ac835987..ed0cf552fce2 100644
--- a/drivers/media/platform/renesas/vsp1/vsp1_drm.c
+++ b/drivers/media/platform/renesas/vsp1/vsp1_drm.c
@@ -861,6 +861,17 @@ int vsp1_du_atomic_update(struct device *dev, unsigned int pipe_index,
 	vsp1->drm->inputs[rpf_index].compose = cfg->dst;
 	vsp1->drm->inputs[rpf_index].zpos = cfg->zpos;
 
+	switch (cfg->blend_mode) {
+	case VSP1_DU_BLEND_MODE_PREMULTI:
+		rpf->format.flags = V4L2_PIX_FMT_FLAG_PREMUL_ALPHA;
+		break;
+	case VSP1_DU_BLEND_MODE_PIXEL_NONE:
+		rpf->pixel_alpha = false;
+		fallthrough;
+	case VSP1_DU_BLEND_MODE_COVERAGE:
+		rpf->format.flags = 0;
+	}
+
 	drm_pipe->pipe.inputs[rpf_index] = rpf;
 
 	return 0;
diff --git a/include/media/vsp1.h b/include/media/vsp1.h
index cc1b0d42ce95..1ba7459b7a06 100644
--- a/include/media/vsp1.h
+++ b/include/media/vsp1.h
@@ -42,6 +42,18 @@ struct vsp1_du_lif_config {
 int vsp1_du_setup_lif(struct device *dev, unsigned int pipe_index,
 		      const struct vsp1_du_lif_config *cfg);
 
+/**
+ * enum vsp1_du_blend_mode - Pixel blend mode
+ * @VSP1_DU_BLEND_MODE_PREMULTI: Pixel alpha is pre-mutiplied
+ * @VSP1_DU_BLEND_MODE_COVERAGE: Pixel alpha is not pre-mutiplied
+ * @VSP1_DU_BLEND_MODE_PIXEL_NONE: Ignores the pixel alpha
+ */
+enum vsp1_du_blend_mode {
+	VSP1_DU_BLEND_MODE_PREMULTI,
+	VSP1_DU_BLEND_MODE_COVERAGE,
+	VSP1_DU_BLEND_MODE_PIXEL_NONE,
+};
+
 /**
  * struct vsp1_du_atomic_config - VSP atomic configuration parameters
  * @pixelformat: plane pixel format (V4L2 4CC)
@@ -51,6 +63,7 @@ int vsp1_du_setup_lif(struct device *dev, unsigned int pipe_index,
  * @dst: destination rectangle on the display (integer coordinates)
  * @alpha: alpha value (0: fully transparent, 255: fully opaque)
  * @zpos: Z position of the plane (from 0 to number of planes minus 1)
+ * @blend_mode: Pixel blend mode of the plane
  */
 struct vsp1_du_atomic_config {
 	u32 pixelformat;
@@ -60,6 +73,7 @@ struct vsp1_du_atomic_config {
 	struct v4l2_rect dst;
 	unsigned int alpha;
 	unsigned int zpos;
+	enum vsp1_du_blend_mode blend_mode;
 };
 
 /**
-- 
2.25.1