4.19-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit 77476360f173c127c191bfe8ca8113130ef283b8 ]
[Why] This fixes an mpc programming error for the following sequence of atomic commits when pipe split is enabled:
Commit 1: CRTC0 (plane 4, plane 3)
Pipe 0: old_plane_state = A0, new_plane_state = A1, new_tg = T0 Pipe 1: old_plane_state = B0, new_plane_state = B1, new_tg = T0 Pipe 2: old_plane_state = A0, new_plane_state = A1, new_tg = T0 Pipe 3: old_plane_state = B0, new_plane_state = B1, new_tg = T0
Commit 2: CRTC0 (plane 3), CRTC1 (plane 2)
Pipe 0: old_plane_state = A1, new_plane_state = A2, new_tg = T0 Pipe 1: old_plane_state = B1, new_plane_state = B2, new_tg = T1 Pipe 2: old_plane_state = A1, new_plane_state = NULL, new_tg = NULL Pipe 3: old_plane_state = B1, new_plane_state = NULL, new_tg = NULL
In the second commit the assertion for mpcc in use is hit because mpcc disconnect never occurs for pipe 1. This is because the stream changes for pipe 1 and the opp_list is empty.
This sequence occurs when running the "igt@kms_plane_multiple@atomic-pipe-A-tiling-none" test with two displays connected.
[How] Expand the reset condition to include:
"old_pipe_ctx->stream_res.tg != new_pipe_ctx->stream_res.tg"
...but only when the plane state is non-NULL for both old and new.
Signed-off-by: Nicholas Kazlauskas nicholas.kazlauskas@amd.com Reviewed-by: Dmytro Laktyushkin Dmytro.Laktyushkin@amd.com Reviewed-by: Tony Cheng Tony.Cheng@amd.com Acked-by: Bhawanpreet Lakha Bhawanpreet.Lakha@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c index 4058b59d9bea..a0355709abd1 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c +++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c @@ -2336,9 +2336,10 @@ static void dcn10_apply_ctx_for_surface( } }
- if (!pipe_ctx->plane_state && - old_pipe_ctx->plane_state && - old_pipe_ctx->stream_res.tg == tg) { + if ((!pipe_ctx->plane_state || + pipe_ctx->stream_res.tg != old_pipe_ctx->stream_res.tg) && + old_pipe_ctx->plane_state && + old_pipe_ctx->stream_res.tg == tg) {
dc->hwss.plane_atomic_disconnect(dc, old_pipe_ctx); removed_pipe[i] = true;