Always enable pixel-level alpha blending with the background, so that
buffers which include an alpha channel are displayed correctly.
Signed-off-by: Brian Starkey <brian.starkey@xxxxxxx>
---
drivers/gpu/drm/arm/malidp_planes.c | 32 ++++++++++++++++++++++++++------
1 file changed, 26 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/arm/malidp_planes.c b/drivers/gpu/drm/arm/malidp_planes.c
index a17d24b..667b9ca 100644
--- a/drivers/gpu/drm/arm/malidp_planes.c
+++ b/drivers/gpu/drm/arm/malidp_planes.c
@@ -27,6 +27,10 @@
#define LAYER_H_FLIP (1 << 10)
#define LAYER_V_FLIP (1 << 11)
#define LAYER_ROT_MASK (0xf << 8)
+#define LAYER_COMP_MASK (0x3 << 12)
+#define LAYER_COMP_PIXEL (0x3 << 12)
+#define LAYER_COMP_PLANE (0x2 << 12)
+#define MALIDP_LAYER_COMPOSE 0x008
#define MALIDP_LAYER_SIZE 0x00c
#define LAYER_H_VAL(x) (((x) & 0x1fff) << 0)
#define LAYER_V_VAL(x) (((x) & 0x1fff) << 16)
@@ -34,6 +38,14 @@
#define MALIDP_LAYER_OFFSET 0x014
#define MALIDP_LAYER_STRIDE 0x018
+/*
+ * This 4-entry look-up-table is used to determine the full 8-bit alpha value
+ * for formats with 1- or 2-bit alpha channels.
+ * We set it to give 100%/0% opacity for 1-bit formats and 100%/66%/33%/0%
+ * opacity for 2-bit formats.
+ */
+#define MALIDP_ALPHA_LUT 0xffaa5500
+
static void malidp_de_plane_destroy(struct drm_plane *plane)
{
struct malidp_plane *mp = to_malidp_plane(plane);
@@ -150,7 +162,7 @@ static void malidp_de_plane_update(struct drm_plane *plane,
const struct malidp_hw_regmap *map;
u8 format_id;
u16 ptr;
- u32 format, src_w, src_h, dest_w, dest_h, val = 0;
+ u32 format, src_w, src_h, dest_w, dest_h, val;
int num_planes, i;
mp = to_malidp_plane(plane);
@@ -194,10 +206,9 @@ static void malidp_de_plane_update(struct drm_plane *plane,
LAYER_V_VAL(plane->state->crtc_y),
mp->layer->base + MALIDP_LAYER_OFFSET);
- /* first clear the rotation bits in the register */
- malidp_hw_clearbits(mp->hwdev, LAYER_ROT_MASK,
- mp->layer->base + MALIDP_LAYER_CONTROL);
+ val = malidp_hw_read(mp->hwdev, mp->layer->base + MALIDP_LAYER_CONTROL);
+ val &= ~LAYER_ROT_MASK;
/* setup the rotation and axis flip bits */
if (plane->state->rotation & DRM_ROTATE_MASK)
val = ilog2(plane->state->rotation & DRM_ROTATE_MASK) << LAYER_ROT_OFFSET;
@@ -206,11 +217,18 @@ static void malidp_de_plane_update(struct drm_plane *plane,
if (plane->state->rotation & DRM_REFLECT_Y)
val |= LAYER_H_FLIP;
+ /*
+ * always enable pixel alpha blending until we have a way to change
+ * blend modes
+ */
+ val &= ~LAYER_COMP_MASK;
+ val |= LAYER_COMP_PIXEL;
+
/* set the 'enable layer' bit */
val |= LAYER_ENABLE;
- malidp_hw_setbits(mp->hwdev, val,
- mp->layer->base + MALIDP_LAYER_CONTROL);
+ malidp_hw_write(mp->hwdev, val,
+ mp->layer->base + MALIDP_LAYER_CONTROL);
}
static void malidp_de_plane_disable(struct drm_plane *plane,
@@ -292,6 +310,8 @@ int malidp_de_planes_init(struct drm_device *drm)
drm->mode_config.rotation_property,
DRM_ROTATE_0);
+ malidp_hw_write(malidp->dev, MALIDP_ALPHA_LUT,
+ plane->layer->base + MALIDP_LAYER_COMPOSE);
}
kfree(formats);
--
1.7.9.5
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