SI_SMC_SOFT_REGISTER_ticks_per_us
ret = si_write_smc_soft_register(adev, SI_SMC_SOFT_REGISTER_ticks_per_us, ticks_per_us);
ret = si_write_smc_soft_register(rdev, SI_SMC_SOFT_REGISTER_ticks_per_us, ticks_per_us);