drm/amdgpu: Protect GPU register accesses in powergated state in some paths

Ungate GPU CG/PG in device_fini_hw and device_halt to protect GPU
register accesses, e.g. GC registers are accessed in amdgpu_irq_disable_all()
and amdgpu_fence_driver_hw_fini().

Signed-off-by: Yifan Zhang <yifan1.zhang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

Author: yifancom

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

@@ -3504,9 +3504,6 @@ static int amdgpu_device_ip_fini_early(struct amdgpu_device *adev)
 		}
 	}
 
-	amdgpu_device_set_pg_state(adev, AMD_PG_STATE_UNGATE);
-	amdgpu_device_set_cg_state(adev, AMD_CG_STATE_UNGATE);
-
 	amdgpu_amdkfd_suspend(adev, true);
 	amdgpu_amdkfd_teardown_processes(adev);
 	amdgpu_userq_suspend(adev);
@@ -4902,6 +4899,9 @@ void amdgpu_device_fini_hw(struct amdgpu_device *adev)
 		amdgpu_virt_fini_data_exchange(adev);
 	}
 
+	amdgpu_device_set_pg_state(adev, AMD_PG_STATE_UNGATE);
+	amdgpu_device_set_cg_state(adev, AMD_CG_STATE_UNGATE);
+
 	/* disable all interrupts */
 	amdgpu_irq_disable_all(adev);
 	if (adev->mode_info.mode_config_initialized) {
@@ -7360,6 +7360,9 @@ void amdgpu_device_halt(struct amdgpu_device *adev)
 	amdgpu_xcp_dev_unplug(adev);
 	drm_dev_unplug(ddev);
 
+	amdgpu_device_set_pg_state(adev, AMD_PG_STATE_UNGATE);
+	amdgpu_device_set_cg_state(adev, AMD_CG_STATE_UNGATE);
+
 	amdgpu_irq_disable_all(adev);
 
 	amdgpu_fence_driver_hw_fini(adev);