TCI_MCLK_PWRMGT_CNTL
RREG32(TCI_MCLK_PWRMGT_CNTL);
WREG32_P(TCI_MCLK_PWRMGT_CNTL, 0, ~MPLL_PWRMGT_OFF);
WREG32_P(TCI_MCLK_PWRMGT_CNTL, MPLL_PWRMGT_OFF, ~MPLL_PWRMGT_OFF);