drm/amd/display: Device flash garbage before get in OS

[ Upstream commit 9c580e8f6cd6524d4e2c3490c440110526f7ddd6 ]

[Why]
Enabling stream with tg lock makes config settings
pending causing the garbage until tg unlock.

[How]
Keep the original lock mechanism
The driver doesn't lock tg if plane_state is null.

Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Chiawen Huang <chiawen.huang@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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 e3a62873c0e70504fe0c6a49f6565b546b3fb5c0..d9ab27991535558ec1f94fbd007d47bb2138de20 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
@@ -108,6 +108,7 @@ void dcn10_lock_all_pipes(struct dc *dc,
                 */
                if (pipe_ctx->top_pipe ||
                    !pipe_ctx->stream ||
+                   !pipe_ctx->plane_state ||
                    !tg->funcs->is_tg_enabled(tg))
                        continue;