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Subject[PATCH 4.20 160/183] drm/amd/display: Fix MST reboot/poweroff sequence
Date
4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Leo (Hanghong) Ma <hanghong.ma@amd.com>

commit d2f0b53bda3193874f3905bc839888f895d1c0cf upstream.

[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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -704,12 +704,13 @@ 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);


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