mmGCVM_L2_CNTL
tmp = RREG32_SOC15(GC, 0, mmGCVM_L2_CNTL);
WREG32_SOC15(GC, 0, mmGCVM_L2_CNTL, tmp);
tmp = RREG32_SOC15(GC, 0, mmGCVM_L2_CNTL);
WREG32_SOC15(GC, 0, mmGCVM_L2_CNTL, tmp);
adev->gmc.VM_L2_CNTL = RREG32_SOC15(GC, 0, mmGCVM_L2_CNTL);
WREG32_SOC15(GC, 0, mmGCVM_L2_CNTL, adev->gmc.VM_L2_CNTL);