From 4c6a9618076c2690a361e8bc32549720f2f42305 Mon Sep 17 00:00:00 2001 From: Alvin Lee Date: Mon, 24 Jun 2019 09:49:44 -0400 Subject: [PATCH] drm/amd/display: Wait for flip to complete [why] In pipe split issue occurs when we program immediate flip while vsync flip is pending [how] Don't program immediate flip until flip is no longer pending Signed-off-by: Alvin Lee Reviewed-by: Jaehyun Chung Acked-by: Leo Li Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c index 5ecf965bc3f5..9daab57a96ea 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c +++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c @@ -1308,6 +1308,17 @@ void dcn20_pipe_control_lock( if (pipe->plane_state != NULL) flip_immediate = pipe->plane_state->flip_immediate; + if (flip_immediate && lock) { + while (pipe->plane_res.hubp->funcs->hubp_is_flip_pending(pipe->plane_res.hubp)) { + udelay(1); + } + + if (pipe->bottom_pipe != NULL) + while (pipe->bottom_pipe->plane_res.hubp->funcs->hubp_is_flip_pending(pipe->bottom_pipe->plane_res.hubp)) { + udelay(1); + } + } + /* In flip immediate and pipe splitting case, we need to use GSL * for synchronization. Only do setup on locking and on flip type change. */ -- 2.30.2