AC97_EXTENDED_STAT_CTRL
ac97_reg_update_bits(dev, AC97_EXTENDED_STAT_CTRL, 1, 1); // enable variable rate audio
if (ac97_reg_cached_read(dev, AC97_EXTENDED_STAT_CTRL) & 0x0002)
if (ac97_reg_cached_read(dev, AC97_EXTENDED_STAT_CTRL) & 0x0002)
if (ac97_reg_update_bits(dev, AC97_EXTENDED_STAT_CTRL, 0x0002, 0x0002)) {
ac97_reg_update_bits(dev, AC97_EXTENDED_STAT_CTRL, 0x0002, 0x0000);
uint16 extCtrl = ac97_reg_cached_read(fAC97Dev, AC97_EXTENDED_STAT_CTRL);