drm/amdgpu/gfx8: Fix compute ring failure after resetting

Do ring clear before ring test, otherwise compute ring test will
fail after gpu resetting. Still can't find the root cause, just
workaround it.

Signed-off-by: Xiangliang.Yu <Xiangliang.Yu@amd.com>
Acked-by: Monk Liu <Monk.Liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c

@@ -4877,9 +4877,6 @@ static int gfx_v8_0_kcq_init_queue(struct amdgpu_ring *ring)
 		/* reset MQD to a clean status */
 		if (adev->gfx.mec.mqd_backup[mqd_idx])
 			memcpy(mqd, adev->gfx.mec.mqd_backup[mqd_idx], sizeof(struct vi_mqd_allocation));
-		/* reset ring buffer */
-		ring->wptr = 0;
-		amdgpu_ring_clear_ring(ring);
 	} else {
 		amdgpu_ring_clear_ring(ring);
 	}
@@ -4954,6 +4951,13 @@ static int gfx_v8_0_kiq_resume(struct amdgpu_device *adev)
 	/* Test KCQs */
 	for (i = 0; i < adev->gfx.num_compute_rings; i++) {
 		ring = &adev->gfx.compute_ring[i];
+		if (adev->in_gpu_reset) {
+			/* move reset ring buffer to here to workaround
+			 * compute ring test failed
+			 */
+			ring->wptr = 0;
+			amdgpu_ring_clear_ring(ring);
+		}
 		ring->ready = true;
 		r = amdgpu_ring_test_ring(ring);
 		if (r)