[PATCH AUTOSEL 6.6 05/40] drm/amd/display: Don't lock phantom pipe on disabling

[Sasha Levin]

From: Alvin Lee <alvin.lee2@xxxxxxx>

[ Upstream commit cbb4c9bc55427774ca4d819933e1b5fa38a6fb44 ]

[Description]
- When disabling a phantom pipe, we first enable the phantom
  OTG so the double buffer update can successfully take place
- However, want to avoid locking the phantom otherwise setting
  DPG_EN=1 for the phantom pipe is blocked (without this we could
  hit underflow due to phantom HUBP being blanked by default)

Reviewed-by: Samson Tam <samson.tam@xxxxxxx>
Acked-by: Stylon Wang <stylon.wang@xxxxxxx>
Signed-off-by: Alvin Lee <alvin.lee2@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

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 9834b75f1837b..79befa17bb037 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
@@ -111,7 +111,8 @@ void dcn10_lock_all_pipes(struct dc *dc,
 		if (pipe_ctx->top_pipe ||
 		    !pipe_ctx->stream ||
 		    (!pipe_ctx->plane_state && !old_pipe_ctx->plane_state) ||
-		    !tg->funcs->is_tg_enabled(tg))
+		    !tg->funcs->is_tg_enabled(tg) ||
+			pipe_ctx->stream->mall_stream_config.type == SUBVP_PHANTOM)
 			continue;
 
 		if (lock)
-- 
2.42.0