drm/amd/display: fix the system hang while disable PSR

[ Upstream commit ea2062dd1f0384ae1b136d333ee4ced15bedae38 ]

[Why]
When the PSR enabled. If you try to adjust the timing parameters,
it may cause system hang. Because the timing mismatch with the
DMCUB settings.

[How]
Disable the PSR before adjusting timing parameters.

Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Acked-by: Stylon Wang <stylon.wang@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Reviewed-by: Wayne Lin <Wayne.Lin@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/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 91f074f..91c308c 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -7902,6 +7902,12 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
                if (acrtc_state->abm_level != dm_old_crtc_state->abm_level)
                        bundle->stream_update.abm_level = &acrtc_state->abm_level;
 
+               mutex_lock(&dm->dc_lock);
+               if ((acrtc_state->update_type > UPDATE_TYPE_FAST) &&
+                               acrtc_state->stream->link->psr_settings.psr_allow_active)
+                       amdgpu_dm_psr_disable(acrtc_state->stream);
+               mutex_unlock(&dm->dc_lock);
+
                /*
                 * If FreeSync state on the stream has changed then we need to
                 * re-adjust the min/max bounds now that DC doesn't handle this
@@ -7915,10 +7921,6 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
                        spin_unlock_irqrestore(&pcrtc->dev->event_lock, flags);
                }
                mutex_lock(&dm->dc_lock);
-               if ((acrtc_state->update_type > UPDATE_TYPE_FAST) &&
-                               acrtc_state->stream->link->psr_settings.psr_allow_active)
-                       amdgpu_dm_psr_disable(acrtc_state->stream);
-
                update_planes_and_stream_adapter(dm->dc,
                                         acrtc_state->update_type,
                                         planes_count,