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From b713b48f76896f3c7bc345888bb1be0a869b1389 Mon Sep 17 00:00:00 2001
From: Alvin Lee <alvin.lee2@amd.com>
Date: Mon, 24 Jun 2019 09:49:44 -0400
Subject: [PATCH 3056/4256] 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 <alvin.lee2@amd.com>
Reviewed-by: Jaehyun Chung <Jaehyun.Chung@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
---
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 b753e40c4196..b089ba1c7614 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
@@ -1285,6 +1285,17 @@ 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.
*/
--
2.17.1
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