Blending win0 with the background color doesn't seem to work correctly. We only get the background color, no matter the contents of the win0 framebuffer. However, blending pre-multiplied color with the default opaque black default background color is a no-op, so we can just disable blending to get the correct result.
Signed-off-by: Kristian H. Kristensen hoegsberg@chromium.org Cc: Sandy Huang hjc@rock-chips.com Cc: Sean Paul seanpaul@chromium.org --- As per Eric's suggestion, we can just disable blending. This replaces the previous "Filter out alpha formats for primary plane" patch.
drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c index fae37b1cd691..1c1dd11d489a 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c @@ -961,7 +961,14 @@ static void vop_plane_atomic_update(struct drm_plane *plane, rb_swap = has_rb_swapped(fb->format->format); VOP_WIN_SET(vop, win, rb_swap, rb_swap);
- if (is_alpha_support(fb->format->format)) { + /* + * Blending win0 with the background color doesn't seem to work + * correctly. We only get the background color, no matter the contents + * of the win0 framebuffer. However, blending pre-multiplied color + * with the default opaque black default background color is a no-op, + * so we can just disable blending to get the correct result. + */ + if (is_alpha_support(fb->format->format) && win_index > 0) { VOP_WIN_SET(vop, win, dst_alpha_ctl, DST_FACTOR_M0(ALPHA_SRC_INVERSE)); val = SRC_ALPHA_EN(1) | SRC_COLOR_M0(ALPHA_SRC_PRE_MUL) |