regVCN_MES_MSTATUS_LO
r = SOC15_WAIT_ON_RREG(VCN, 0, regVCN_MES_MSTATUS_LO, 0xAAAAAAAA, 0xFFFFFFFF);
RREG32_SOC15(VCN, 0, regVCN_MES_MSTATUS_LO));