Alpha formats in DRM are assumed to be premultiplied, so we should be setting the PREMULT bit in the plane configuration for HVS.
Changes from v1: - Use correct has_alpha
Signed-off-by: Stefan Schake stschake@gmail.com --- drivers/gpu/drm/vc4/vc4_plane.c | 3 ++- drivers/gpu/drm/vc4/vc4_regs.h | 1 + 2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c index c4c7af1..831e195 100644 --- a/drivers/gpu/drm/vc4/vc4_plane.c +++ b/drivers/gpu/drm/vc4/vc4_plane.c @@ -618,13 +618,14 @@ static int vc4_plane_mode_set(struct drm_plane *plane, SCALER_POS1_SCL_HEIGHT)); }
- /* Position Word 2: Source Image Size, Alpha Mode */ + /* Position Word 2: Source Image Size, Alpha */ vc4_state->pos2_offset = vc4_state->dlist_count; vc4_dlist_write(vc4_state, VC4_SET_FIELD(fb->format->has_alpha ? SCALER_POS2_ALPHA_MODE_PIPELINE : SCALER_POS2_ALPHA_MODE_FIXED, SCALER_POS2_ALPHA_MODE) | + (fb->format->has_alpha ? SCALER_POS2_ALPHA_PREMULT : 0) | VC4_SET_FIELD(vc4_state->src_w[0], SCALER_POS2_WIDTH) | VC4_SET_FIELD(vc4_state->src_h[0], SCALER_POS2_HEIGHT));
diff --git a/drivers/gpu/drm/vc4/vc4_regs.h b/drivers/gpu/drm/vc4/vc4_regs.h index b9749cb..a141496 100644 --- a/drivers/gpu/drm/vc4/vc4_regs.h +++ b/drivers/gpu/drm/vc4/vc4_regs.h @@ -848,6 +848,7 @@ enum hvs_pixel_format { #define SCALER_POS2_ALPHA_MODE_FIXED 1 #define SCALER_POS2_ALPHA_MODE_FIXED_NONZERO 2 #define SCALER_POS2_ALPHA_MODE_FIXED_OVER_0x07 3 +#define SCALER_POS2_ALPHA_PREMULT BIT(29)
#define SCALER_POS2_HEIGHT_MASK VC4_MASK(27, 16) #define SCALER_POS2_HEIGHT_SHIFT 16