SI_SMC_SOFT_REGISTER_mclk_chg_timeout
si_write_smc_soft_register(adev, SI_SMC_SOFT_REGISTER_mclk_chg_timeout, vbi_dly);
si_write_smc_soft_register(rdev, SI_SMC_SOFT_REGISTER_mclk_chg_timeout, vbi_dly);