This patch disables blending the mixer's layer 0 onto the background (solid color). It doesn't make sense to blend this layer by default, and causes color distortion if the layer is used for arbitrary content.
Signed-off-by: Sean Paul seanpaul@chromium.org --- drivers/gpu/drm/exynos/exynos_mixer.c | 8 +++++--- 1 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c index f08e251..ec3e376 100644 --- a/drivers/gpu/drm/exynos/exynos_mixer.c +++ b/drivers/gpu/drm/exynos/exynos_mixer.c @@ -643,12 +643,14 @@ static void mixer_win_reset(struct mixer_context *ctx) /* setting graphical layers */ val = MXR_GRP_CFG_COLOR_KEY_DISABLE; /* no blank key */ val |= MXR_GRP_CFG_WIN_BLEND_EN; - val |= MXR_GRP_CFG_BLEND_PRE_MUL; - val |= MXR_GRP_CFG_PIXEL_BLEND_EN; val |= MXR_GRP_CFG_ALPHA_VAL(0xff); /* non-transparent alpha */
- /* the same configuration for both layers */ + /* Don't blend layer 0 onto the mixer background */ mixer_reg_write(res, MXR_GRAPHIC_CFG(0), val); + + /* Blend layer 1 into layer 0 */ + val |= MXR_GRP_CFG_BLEND_PRE_MUL; + val |= MXR_GRP_CFG_PIXEL_BLEND_EN; mixer_reg_write(res, MXR_GRAPHIC_CFG(1), val);
/* setting video layers */