mmVM_L2_CNTL4
WREG32_SOC15_RLC(GC, 0, mmVM_L2_CNTL4, tmp);
tmp = RREG32(mmVM_L2_CNTL4);
WREG32(mmVM_L2_CNTL4, tmp);
WREG32_SOC15(MMHUB, 0, mmVM_L2_CNTL4, tmp);