Thread (119 messages) 119 messages, 3 authors, 2021-05-14
STALE1841d REVIEWED: 2 (0M)

[PATCH AUTOSEL 5.12 077/116] drm/amd/display: Force vsync flip when reconfiguring MPCC

From: Sasha Levin <sashal@kernel.org>
Date: 2021-05-05 16:37:29
Also in: amd-gfx, dri-devel, lkml
Subsystem: amd display core, drm drivers, radeon and amdgpu drm drivers, the rest · Maintainers: Harry Wentland, Leo Li, David Airlie, Simona Vetter, Alex Deucher, Christian König, Linus Torvalds

From: Anthony Wang <redacted>

[ Upstream commit 56d63782af9bbd1271bff1422a6a013123eade4d ]

[Why]
Underflow observed when disabling PIP overlay in-game when
vsync is disabled, due to OTC master lock not working with
game pipe which is immediate flip.

[How]
When performing a full update, override flip_immediate value
to false for all planes, so that flip occurs on vsync.

Signed-off-by: Anthony Wang <redacted>
Acked-by: Bindu Ramamurthy <redacted>
Tested-by: Daniel Wheeler <redacted>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c | 4 ++++
 1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 8f8a13c7cf73..2673a7125603 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -2545,6 +2545,10 @@ static void commit_planes_for_stream(struct dc *dc,
 						plane_state->triplebuffer_flips = true;
 				}
 			}
+			if (update_type == UPDATE_TYPE_FULL) {
+				/* force vsync flip when reconfiguring pipes to prevent underflow */
+				plane_state->flip_immediate = false;
+			}
 		}
 	}
 
-- 
2.30.2
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