[PATCH v2 1/3] media: vsp1: add premultiplied alpha support

[Takanari Hayama]

To support DRM blend mode in R-Car DU driver, we must be able to pass
a plane with the premultiplied alpha. Adding a new property to
vsp1_du_atomic_config allows the R-Car DU driver to pass the
premultiplied alpha plane.

Signed-off-by: Takanari Hayama <taki at igel.co.jp>
---
 drivers/media/platform/renesas/vsp1/vsp1_drm.c | 2 ++
 include/media/vsp1.h                           | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/drivers/media/platform/renesas/vsp1/vsp1_drm.c b/drivers/media/platform/renesas/vsp1/vsp1_drm.c
index 0c2507dc03d6..019e18976bd8 100644
--- a/drivers/media/platform/renesas/vsp1/vsp1_drm.c
+++ b/drivers/media/platform/renesas/vsp1/vsp1_drm.c
@@ -856,6 +856,8 @@ int vsp1_du_atomic_update(struct device *dev, unsigned int pipe_index,
 	rpf->mem.addr[1] = cfg->mem[1];
 	rpf->mem.addr[2] = cfg->mem[2];
 
+	rpf->format.flags = (cfg->premult) ? V4L2_PIX_FMT_FLAG_PREMUL_ALPHA : 0;
+
 	vsp1->drm->inputs[rpf_index].crop = cfg->src;
 	vsp1->drm->inputs[rpf_index].compose = cfg->dst;
 	vsp1->drm->inputs[rpf_index].zpos = cfg->zpos;
diff --git a/include/media/vsp1.h b/include/media/vsp1.h
index cc1b0d42ce95..48f4a5023d81 100644
--- a/include/media/vsp1.h
+++ b/include/media/vsp1.h
@@ -51,6 +51,7 @@ 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)
+ * @premult: true for premultiplied alpha
  */
 struct vsp1_du_atomic_config {
 	u32 pixelformat;
@@ -60,6 +61,7 @@ struct vsp1_du_atomic_config {
 	struct v4l2_rect dst;
 	unsigned int alpha;
 	unsigned int zpos;
+	bool premult;
 };
 
 /**
-- 
2.25.1