AC97_ALC650_CLOCK_SOURCE
ac97_reg_update_bits(dev, AC97_ALC650_CLOCK_SOURCE, 0x400, 0x400);
val = ac97_reg_cached_read(dev, AC97_ALC650_CLOCK_SOURCE);
ac97_reg_cached_write(dev, AC97_ALC650_CLOCK_SOURCE, val);
ac97_reg_cached_write(dev, AC97_ALC650_CLOCK_SOURCE, 0x20d2);