ac_clr
ac_clr(ac, AC97_EXTENDED_AUDIO_STAT_CTRL_REGISTER,
ac_clr(ac, AC97_EXTENDED_AUDIO_STAT_CTRL_REGISTER, EASCR_VRA);
ac_clr(ac, AC97_MIC_VOLUME_REGISTER, MICVR_20dB_BOOST);
ac_clr(ac, ADS_MISC_CFG_REGISTER, AMCR_2CMIC);
ac_clr(ac, AC97_GENERAL_PURPOSE_REGISTER, GPR_MS_MIC2);
ac_clr(ac, ADS_MISC_CFG_REGISTER, AMCR_2CMIC);
ac_clr(ac, AC97_GENERAL_PURPOSE_REGISTER, GPR_MS_MIC2);
ac_clr(ac, ALC_DATA_FLOW_CTRL_REGISTER, ADFC_CENTER_LFE);
ac_clr(ac, ALC_DATA_FLOW_CTRL_REGISTER, ADFC_BACK_SURROUND);
ac_clr(ac, ALC_DATA_FLOW_CTRL_REGISTER, ADFC_SURROUND);
ac_clr(ac, ALC_MISC_CTRL_REGISTER, AMC_VREFOUT_DIS);
ac_clr(ac, CMI_MULTICH_REGISTER, CMR_S2LNI);
ac_clr(ac, CMI_MULTICH_REGISTER, CMR_CLCTL);
ac_clr(ac, CMI_TASK_REGISTER, CTR_S2LNI);
ac_clr(ac, CMI_TASK_REGISTER, CTR_F2R);
ac_clr(ac, AC97_MIC_VOLUME_REGISTER, MICVR_20dB_BOOST);
ac_clr(ac, CMI_MULTICH_REGISTER, CMR_BSTSEL);
ac_clr(ac, CMI_MULTICH_REGISTER, CMR_BSTSEL);
void ac_clr(ac97_t *, uint8_t, uint16_t);