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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>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alvin Lee 2019-06-24 09:49:44 -04:00 committed by Alex Deucher
parent 09fc26c171
commit 39fee5f60c
1 changed files with 11 additions and 0 deletions
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11
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
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@ -1265,6 +1265,17 @@ 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.
*/