R128_MCLK_CNTL
uint32 mclkCntl = GetPLLReg(R128_MCLK_CNTL);
SetPLLReg(R128_MCLK_CNTL, mclkCntl | R128_FORCE_GCP | R128_FORCE_PIPE3D_CP);
SetPLLReg(R128_MCLK_CNTL, mclkCntl);