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| 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/ac97/ac97_pcm.c | |
| parent | 2b29b13c5794f648cd5e839796496704d787f5a6 (diff) | |
| download | linux-6dbe662874ba08585eaf732d126762c25ac8e3f7.tar.gz linux-6dbe662874ba08585eaf732d126762c25ac8e3f7.tar.bz2 linux-6dbe662874ba08585eaf732d126762c25ac8e3f7.zip | |
[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/ac97/ac97_pcm.c')
| -rw-r--r-- | sound/pci/ac97/ac97_pcm.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/sound/pci/ac97/ac97_pcm.c b/sound/pci/ac97/ac97_pcm.c index f684aa2c0067..3758d07182f8 100644 --- a/sound/pci/ac97/ac97_pcm.c +++ b/sound/pci/ac97/ac97_pcm.c @@ -269,6 +269,7 @@ int snd_ac97_set_rate(struct snd_ac97 *ac97, int reg, unsigned int rate) return -EINVAL; } + snd_ac97_update_power(ac97, reg, 1); switch (reg) { case AC97_PCM_MIC_ADC_RATE: if ((ac97->regs[AC97_EXTENDED_STATUS] & AC97_EA_VRM) == 0) /* MIC VRA */ @@ -606,6 +607,7 @@ int snd_ac97_pcm_open(struct ac97_pcm *pcm, unsigned int rate, goto error; } } + pcm->cur_dbl = r; spin_unlock_irq(&pcm->bus->bus_lock); for (i = 3; i < 12; i++) { if (!(slots & (1 << i))) @@ -651,6 +653,21 @@ int snd_ac97_pcm_close(struct ac97_pcm *pcm) unsigned short slots = pcm->aslots; int i, cidx; +#ifdef CONFIG_SND_AC97_POWER_SAVE + int r = pcm->cur_dbl; + for (i = 3; i < 12; i++) { + if (!(slots & (1 << i))) + continue; + for (cidx = 0; cidx < 4; cidx++) { + if (pcm->r[r].rslots[cidx] & (1 << i)) { + int reg = get_slot_reg(pcm, cidx, i, r); + snd_ac97_update_power(pcm->r[r].codec[cidx], + reg, 0); + } + } + } +#endif + bus = pcm->bus; spin_lock_irq(&pcm->bus->bus_lock); for (i = 3; i < 12; i++) { @@ -660,6 +677,7 @@ int snd_ac97_pcm_close(struct ac97_pcm *pcm) bus->used_slots[pcm->stream][cidx] &= ~(1 << i); } pcm->aslots = 0; + pcm->cur_dbl = 0; spin_unlock_irq(&pcm->bus->bus_lock); return 0; } |