mmMMSCH_VF_VMID
data = RREG32_SOC15(UVD, 0, mmMMSCH_VF_VMID);
WREG32_SOC15(UVD, 0, mmMMSCH_VF_VMID, data);
data = RREG32_SOC15(VCN, 0, mmMMSCH_VF_VMID);
WREG32_SOC15(VCN, 0, mmMMSCH_VF_VMID, data);
tmp = RREG32_SOC15(VCN, 0, mmMMSCH_VF_VMID);
WREG32_SOC15(VCN, 0, mmMMSCH_VF_VMID, tmp);