[PATCH AUTOSEL 5.12 077/160] drm/amd/display: Release MST resources on switch from MST to SST
From: Sasha Levin <sashal@kernel.org>
Date: 2021-07-06 11:39:21
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: Vladimir Stempen <redacted> [ Upstream commit 3f8518b60c10aa96f3efa38a967a0b4eb9211ac0 ] [why] When OS overrides training link training parameters for MST device to SST mode, MST resources are not released and leak of the resource may result crash and incorrect MST discovery during following hot plugs. [how] Retaining sink object to be reused by SST link and releasing MST resources. Signed-off-by: Vladimir Stempen <redacted> Reviewed-by: Wenjing Liu <redacted> Acked-by: Stylon Wang <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_link_dp.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
index c1391bfb7a9b..208454df17d7 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c@@ -1726,6 +1726,8 @@ static void set_dp_mst_mode(struct dc_link *link, bool mst_enable) link->type = dc_connection_single; link->local_sink = link->remote_sinks[0]; link->local_sink->sink_signal = SIGNAL_TYPE_DISPLAY_PORT; + dc_sink_retain(link->local_sink); + dm_helpers_dp_mst_stop_top_mgr(link->ctx, link); } else if (mst_enable == true && link->type == dc_connection_single && link->remote_sinks[0] != NULL) {
--
2.30.2