[PATCH 5.19 57/72] drm/amd/display: Fix plug/unplug external monitor will hang while playback MPO video

Greg Kroah-Hartman
2022-09-02T12:54:35Z

From: Tom Chung <chiahsuan.chung@amd.com>

[ Upstream commit e98459c06e3d45c2229b097f7b8cdd412357fa2f ]

[Why]
Pipes for MPO primary and overlay will be power down and power up during
plug/unplug external monitor while MPO video playback.
But the pipes were the same after plug/unplug and should not need to be
power down and power up or it will make page flip interrupt disabled and
cause hang issue.

[How]
Add pipe split change condition that not only check the top pipe pointer
but also check the index of top pipe if both top pipes are available.

Reviewed-by: Sun peng Li <Sunpeng.Li@amd.com>
Acked-by: Brian Chang <Brian.Chang@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@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>
---
drivers/gpu/drm/amd/display/dc/core/dc.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 7d69341acca02..9dbd965d8afb3 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -1067,8 +1067,15 @@ static void disable_dangling_plane(struct dc *dc, struct dc_state *context)
struct dc_stream_state *old_stream =
dc->current_state->res_ctx.pipe_ctx[i].stream;
bool should_disable = true;
- bool pipe_split_change =
- context->res_ctx.pipe_ctx[i].top_pipe != dc->current_state->res_ctx.pipe_ctx[i].top_pipe;
+ bool pipe_split_change = false;
+
+ if ((context->res_ctx.pipe_ctx[i].top_pipe) &&
+ (dc->current_state->res_ctx.pipe_ctx[i].top_pipe))
+ pipe_split_change = context->res_ctx.pipe_ctx[i].top_pipe->pipe_idx !=
+ dc->current_state->res_ctx.pipe_ctx[i].top_pipe->pipe_idx;
+ else
+ pipe_split_change = context->res_ctx.pipe_ctx[i].top_pipe !=
+ dc->current_state->res_ctx.pipe_ctx[i].top_pipe;

for (j = 0; j < context->stream_count; j++) {
if (old_stream == context->streams[j]) {
--
2.35.1