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The TDR will be randomly failed due to compute ring test failure. If the compute ring wptr & 0x7ff(ring_buf_mask) is 0x100 then after map mqd the compute ring rptr will be synced with 0x100. And the ring test packet size is also 0x100. Then after invocation of amdgpu_ring_commit, the cp will not really handle the packet on the ring buffer because rptr is equal to wptr. Signed-off-by: Yintian Tao <yttao@amd.com> Acked-by: Christian König <christian.koenig@amd.com> Reviewed-by: Monk Liu <Monk.Liu@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>