drm/amdgpu: restore uvd fence seq in uvd resume

otherwise, uvd block will be never powered up in ring begin_use()
callback. uvd ring test will be fail in resume in rumtime pm.

Signed-off-by: Jim Qu <Jim.Qu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -346,6 +346,8 @@ int amdgpu_uvd_resume(struct amdgpu_device *adev)
 			ptr += le32_to_cpu(hdr->ucode_size_bytes);
 		}
 		memset_io(ptr, 0, size);
+		/* to restore uvd fence seq */
+		amdgpu_fence_driver_force_completion(&adev->uvd.ring);
 	}
 
 	return 0;