diff options
| author | Jaroslav Kysela <perex@suse.cz> | 2004-04-24 19:58:26 +0200 |
|---|---|---|
| committer | Jaroslav Kysela <perex@suse.cz> | 2004-04-24 19:58:26 +0200 |
| commit | 94c2b95f5b50e4d2fb7535d2479747259cce905b (patch) | |
| tree | c5e1ea24ef9dc652a9545209a0ff86720f37954e /sound | |
| parent | 16486f85f78e46dfdd0fa961fbf462c9935f558e (diff) | |
| download | history-94c2b95f5b50e4d2fb7535d2479747259cce905b.tar.gz | |
ALSA CVS update - Takashi Iwai <tiwai@suse.de>
AC97 Codec Core
- export snd_ac97_suspend().
- mute MASTER and HEADPHONE volumes in suspend to avoid possible clicks.
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/pci/ac97/ac97_codec.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/sound/pci/ac97/ac97_codec.c b/sound/pci/ac97/ac97_codec.c index 91885cded75c09..6b3e9342f29518 100644 --- a/sound/pci/ac97/ac97_codec.c +++ b/sound/pci/ac97/ac97_codec.c @@ -2001,11 +2001,19 @@ int snd_ac97_mixer(ac97_bus_t * bus, ac97_t * _ac97, ac97_t ** rac97) * @ac97: the ac97 instance * * Suspends the codec, power down the chip. + * MASTER and HEADPHONE registers are muted but the register cache values + * are not changed, so that the values can be restored in snd_ac97_resume(). */ void snd_ac97_suspend(ac97_t *ac97) { unsigned short power = (ac97->regs[AC97_POWERDOWN] ^ 0x8000) & ~0x8000; /* invert EAPD */ + if (ac97_is_audio(ac97)) { + /* some codecs have stereo mute bits */ + snd_ac97_write(ac97, AC97_MASTER, 0x9f9f); + snd_ac97_write(ac97, AC97_HEADPHONE, 0x9f9f); + } + power |= 0x4000; /* Headphone amplifier powerdown */ power |= 0x0300; /* ADC & DAC powerdown */ snd_ac97_write(ac97, AC97_POWERDOWN, power); @@ -2297,6 +2305,7 @@ EXPORT_SYMBOL(snd_ac97_tune_hardware); EXPORT_SYMBOL(snd_ac97_set_rate); #ifdef CONFIG_PM EXPORT_SYMBOL(snd_ac97_resume); +EXPORT_SYMBOL(snd_ac97_suspend); #endif /* |