mmUVD_GP_SCRATCH8
amdgpu_ring_write(ring, PACKET0(mmUVD_GP_SCRATCH8, 0));
amdgpu_ring_write(ring, PACKET0(mmUVD_GP_SCRATCH8, 0));
PACKET0(SOC15_REG_OFFSET(UVD, ring->me, mmUVD_GP_SCRATCH8), 0));
PACKET0(SOC15_REG_OFFSET(UVD, 0, mmUVD_GP_SCRATCH8), 0));