diff options
| author | Takashi Iwai <tiwai@suse.de> | 2007-08-10 17:21:45 +0200 |
|---|---|---|
| committer | Jaroslav Kysela <perex@perex.cz> | 2007-10-16 15:58:46 +0200 |
| commit | cb53c626e1145edf1d619bc4953f6293d3a77ace (patch) | |
| tree | 715c2ef3d56a5ac7c79498800e888f562c1aa961 /sound/pci/hda/hda_local.h | |
| parent | cca3b3718ca96dca51daf1129ac03003bcede751 (diff) | |
[ALSA] hda-intel - Add POWER_SAVE option
Added CONFIG_SND_HDA_POWER_SAVE kconfig. It's an experimental option
to achieve an aggressive power-saving. With this option, the driver
will turn on/off the power of each codec and controller chip dynamically
on demand.
The patch introduces a new module option 'power_save'. It specifies
the second of time-out for automatic power-down. As default, it's
10 seconds. Setting 0 means to suppress the power-saving feature.
The codec may have analog-input loopbacks, which are usually represented
by mixer elements such as 'Mic Playback Switch' or 'CD Playback Switch'.
When these are on, we cannot turn off the mixer and the codec chip has
to be kept on. For bookkeeping these states, a new codec-callback is
introduced.
For the bus-controller side, a new callback pm_notify is introduced,
which can be used to turn on/off the contoller appropriately.
Note that this power-saving might cause slight click-noise at
power-on/off. Also, it might take some time to wake up the codec, and
might even drop some tones at the very beginning. This seems to be the
side-effect of turning off the controller chip.
This turn-off of the controller can be disabled by undefining
HDA_POWER_SAVE_RESET_CONTOLLER in hda_intel.c.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
Diffstat (limited to 'sound/pci/hda/hda_local.h')
| -rw-r--r-- | sound/pci/hda/hda_local.h | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/sound/pci/hda/hda_local.h b/sound/pci/hda/hda_local.h index 35ea0cf37a2..a79d0ed5469 100644 --- a/sound/pci/hda/hda_local.h +++ b/sound/pci/hda/hda_local.h @@ -86,7 +86,7 @@ int snd_hda_codec_amp_update(struct hda_codec *codec, hda_nid_t nid, int ch, int direction, int idx, int mask, int val); int snd_hda_codec_amp_stereo(struct hda_codec *codec, hda_nid_t nid, int dir, int idx, int mask, int val); -#ifdef CONFIG_PM +#ifdef SND_HDA_NEEDS_RESUME void snd_hda_codec_resume_amp(struct hda_codec *codec); #endif @@ -366,4 +366,27 @@ int snd_hda_override_amp_caps(struct hda_codec *codec, hda_nid_t nid, int dir, */ int snd_hda_create_hwdep(struct hda_codec *codec); +/* + * power-management + */ + +#ifdef CONFIG_SND_HDA_POWER_SAVE +void snd_hda_schedule_power_save(struct hda_codec *codec); + +struct hda_amp_list { + hda_nid_t nid; + unsigned char dir; + unsigned char idx; +}; + +struct hda_loopback_check { + struct hda_amp_list *amplist; + int power_on; +}; + +int snd_hda_check_amp_list_power(struct hda_codec *codec, + struct hda_loopback_check *check, + hda_nid_t nid); +#endif /* CONFIG_SND_HDA_POWER_SAVE */ + #endif /* __SOUND_HDA_LOCAL_H */ |