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authorHector Martin <hector@marcansoft.com>2009-12-20 22:51:31 +0100
committerTakashi Iwai <tiwai@suse.de>2009-12-21 11:20:29 +0100
commitf5de24b06aa46427500d0fdbe8616b73a71d8c28 (patch)
tree97ce905a10b013357df2abf716af2e3795efa55e /sound
parent556eea9a926bff8f014b4f80522b4de97ae84213 (diff)
ALSA: HDA: add powersaving hook for Realtek
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>
Diffstat (limited to 'sound')
-rw-r--r--sound/pci/hda/patch_realtek.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index faeb74f2820..b3abe9ca826 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -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,