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ALSA: HDA: add powersaving hook for Realtek

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The current Realtek code makes no specific provision for turning stuff
off. The codec chip is placed into low-power mode generically, but this
doesn't turn off any external hardware connected to it, in particular
external amplifiers.

This patch creates a hook function that is called by the codec
suspend/resume functions. It ought to disable any external hardware in a
device-specific way. I've implemented a generic ALC889 function that
sets the EAPD pin properly, and used it for the Acer Aspire 8930G which
can benefit from this feature.

On my laptop, this results in ~0.5W extra savings.

Signed-off-by: Hector Martin <hector@marcansoft.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Hector Martin 2009-12-20 22:51:31 +01:00 committed by Takashi Iwai
parent 556eea9a92
commit f5de24b06a
1 changed files with 36 additions and 0 deletions
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36
sound/pci/hda/patch_realtek.c
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@ -337,6 +337,9 @@ struct alc_spec {
/* hooks */
void (*init_hook)(struct hda_codec *codec);
void (*unsol_event)(struct hda_codec *codec, unsigned int res);
#ifdef CONFIG_SND_HDA_POWER_SAVE
void (*power_hook)(struct hda_codec *codec, int power);
#endif
/* for pin sensing */
unsigned int sense_updated: 1;
@ -388,6 +391,7 @@ struct alc_config_preset {
void (*init_hook)(struct hda_codec *);
#ifdef CONFIG_SND_HDA_POWER_SAVE
struct hda_amp_list *loopbacks;
void (*power_hook)(struct hda_codec *codec, int power);
#endif
};
@ -900,6 +904,7 @@ static void setup_preset(struct hda_codec *codec,
spec->unsol_event = preset->unsol_event;
spec->init_hook = preset->init_hook;
#ifdef CONFIG_SND_HDA_POWER_SAVE
spec->power_hook = preset->power_hook;
spec->loopback.amplist = preset->loopbacks;
#endif
@ -1826,6 +1831,16 @@ static void alc889_acer_aspire_8930g_setup(struct hda_codec *codec)
spec->autocfg.speaker_pins[2] = 0x1b;
}
#ifdef CONFIG_SND_HDA_POWER_SAVE
static void alc889_power_eapd(struct hda_codec *codec, int power)
{
snd_hda_codec_write(codec, 0x14, 0,
AC_VERB_SET_EAPD_BTLENABLE, power ? 2 : 0);
snd_hda_codec_write(codec, 0x15, 0,
AC_VERB_SET_EAPD_BTLENABLE, power ? 2 : 0);
}
#endif
/*
* ALC880 3-stack model
*
@ -3619,12 +3634,29 @@ static void alc_free(struct hda_codec *codec)
snd_hda_detach_beep_device(codec);
}
#ifdef CONFIG_SND_HDA_POWER_SAVE
static int alc_suspend(struct hda_codec *codec, pm_message_t state)
{
struct alc_spec *spec = codec->spec;
if (spec && spec->power_hook)
spec->power_hook(codec, 0);
return 0;
}
#endif
#ifdef SND_HDA_NEEDS_RESUME
static int alc_resume(struct hda_codec *codec)
{
#ifdef CONFIG_SND_HDA_POWER_SAVE
struct alc_spec *spec = codec->spec;
#endif
codec->patch_ops.init(codec);
snd_hda_codec_resume_amp(codec);
snd_hda_codec_resume_cache(codec);
#ifdef CONFIG_SND_HDA_POWER_SAVE
if (spec && spec->power_hook)
spec->power_hook(codec, 1);
#endif
return 0;
}
#endif
@ -3641,6 +3673,7 @@ static struct hda_codec_ops alc_patch_ops = {
.resume = alc_resume,
#endif
#ifdef CONFIG_SND_HDA_POWER_SAVE
.suspend = alc_suspend,
.check_power_status = alc_check_power_status,
#endif
};
@ -9420,6 +9453,9 @@ static struct alc_config_preset alc882_presets[] = {
.unsol_event = alc_automute_amp_unsol_event,
.setup = alc889_acer_aspire_8930g_setup,
.init_hook = alc_automute_amp,
#ifdef CONFIG_SND_HDA_POWER_SAVE
.power_hook = alc889_power_eapd,
#endif
},
[ALC888_ACER_ASPIRE_7730G] = {
.mixers = { alc883_3ST_6ch_mixer,