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drm/amd/display: Fix MST reboot/poweroff sequence 

[Why]

drm_dp_mst_topology_mgr_suspend() is added into the new reboot
sequence, which disables the UP request at the beginning.
Therefore sideband messages are blocked.

[How]

Finish MST sideband message transaction before UP request is
suppressed.

Signed-off-by: Leo (Hanghong) Ma <hanghong.ma@amd.com>
Reviewed-by: Roman Li <Roman.Li@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
hifive-unleashed-5.1
Leo (Hanghong) Ma 2019-01-24 15:07:52 -05:00 committed by Alex Deucher
parent 9db97d8aa8
commit d2f0b53bda
1 changed files with 3 additions and 2 deletions
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5
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -786,12 +786,13 @@ static int dm_suspend(void *handle)
struct amdgpu_display_manager *dm = &adev->dm;
int ret = 0;
WARN_ON(adev->dm.cached_state);
adev->dm.cached_state = drm_atomic_helper_suspend(adev->ddev);
s3_handle_mst(adev->ddev, true);
amdgpu_dm_irq_suspend(adev);
WARN_ON(adev->dm.cached_state);
adev->dm.cached_state = drm_atomic_helper_suspend(adev->ddev);
dc_set_power_state(dm->dc, DC_ACPI_CM_POWER_STATE_D3);