diff options
| author | Takashi Iwai <tiwai@suse.de> | 2006-06-27 18:28:53 +0200 |
|---|---|---|
| committer | Jaroslav Kysela <perex@suse.cz> | 2006-09-23 10:37:08 +0200 |
| commit | 6dbe662874ba08585eaf732d126762c25ac8e3f7 (patch) | |
| tree | 7460c36d4d848f223b682f7a700866bcf6dbc7d5 /sound/pci/via82xx.c | |
| parent | 2b29b13c5794f648cd5e839796496704d787f5a6 (diff) | |
[ALSA] Add experimental support of aggressive AC97 power-saving mode
Added CONFIG_SND_AC97_POWER_SAVE kernel config to enable the support
of aggressive AC97 power-saving mode. In this mode, the AC97
powerdown register bits are dynamically controlled at each open/close
of PCM streams.
The mode is activated via power_save option for snd-ac97-codec
driver. As default it's off. It can be turned on/off on the fly
via sysfs, too.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
Diffstat (limited to 'sound/pci/via82xx.c')
| -rw-r--r-- | sound/pci/via82xx.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/sound/pci/via82xx.c b/sound/pci/via82xx.c index 08da9234efb3..2c23a665c3e3 100644 --- a/sound/pci/via82xx.c +++ b/sound/pci/via82xx.c @@ -1277,7 +1277,18 @@ static int snd_via82xx_pcm_close(struct snd_pcm_substream *substream) if (! ratep->used) ratep->rate = 0; spin_unlock_irq(&ratep->lock); - + if (! ratep->rate) { + if (! viadev->direction) { + snd_ac97_update_power(chip->ac97, + AC97_PCM_FRONT_DAC_RATE, 0); + snd_ac97_update_power(chip->ac97, + AC97_PCM_SURR_DAC_RATE, 0); + snd_ac97_update_power(chip->ac97, + AC97_PCM_LFE_DAC_RATE, 0); + } else + snd_ac97_update_power(chip->ac97, + AC97_PCM_LR_ADC_RATE, 0); + } viadev->substream = NULL; return 0; } |