drm/amdgpu: add ring test for page queue

We add page queue for sdma to update page table. So here it also needs ring test
to verify it workable during the initialization.
Signed-off-by: NHuang Rui <ray.huang@amd.com>
Reviewed-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c

@@ -1150,6 +1150,15 @@ static int sdma_v4_0_start(struct amdgpu_device *adev)
 			return r;
 		}
 
+		if (adev->sdma.has_page_queue) {
+			ring = &adev->sdma.instance[i].page;
+			r = amdgpu_ring_test_ring(ring);
+			if (r) {
+				ring->ready = false;
+				return r;
+			}
+		}
+
 		if (adev->mman.buffer_funcs_ring == ring)
 			amdgpu_ttm_set_buffer_funcs_status(adev, true);
 	}