[PATCH 33/36] drm/amd/display: revert wait in pipelock

[Bhawanpreet Lakha]

From: Jun Lei <Jun.Lei at amd.com>

[why]
Previous workaround to prevent a vsync flip to be converted
to immediate flip is no longer needed, and is risky because
there are cases where it can result in infinite loop.

[how]
Remove wait loop (which is potentially infinite) before locking
pipe

Signed-off-by: Jun Lei <Jun.Lei at amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu at amd.com>
Reviewed-by: Eric Yang <eric.yang2 at amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c | 11 -----------
 1 file changed, 11 deletions(-)

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 fb7a244eafca..69d600183db8 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
@@ -1107,17 +1107,6 @@ 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