[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>

1 files changed, 56 insertions, 12 deletions

diff --git a/sound/pci/hda/patch_via.c b/sound/pci/hda/patch_via.c
index 6c734f07e5b5..33b5e1ffa817 100644
--- a/sound/pci/hda/patch_via.c
+++ b/sound/pci/hda/patch_via.c
@@ -115,6 +115,10 @@ struct via_spec {
         struct snd_kcontrol_new *kctl_alloc;
         struct hda_input_mux private_imux;
         hda_nid_t private_dac_nids[4];  
+
+#ifdef CONFIG_SND_HDA_POWER_SAVE
+        struct hda_loopback_check loopback;
+#endif
 };
 
 static hda_nid_t vt1708_adc_nids[2] = {
@@ -305,15 +309,15 @@ static struct hda_verb vt1708_volume_init_verbs[] = {
         {0x27, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_UNMUTE(0)},
 
 
-        /* Unmute input amps (CD, Line In, Mic 1 & Mic 2) of the analog-loopback
+        /* Mute input amps (CD, Line In, Mic 1 & Mic 2) of the analog-loopback
          * mixer widget
          */
         /* Amp Indices: CD = 1, Mic1 = 2, Line = 3, Mic2 = 4 */
-        {0x17, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_UNMUTE(0)},
-        {0x17, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_UNMUTE(1)},
-        {0x17, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_UNMUTE(2)},
-        {0x17, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_UNMUTE(3)},
-        {0x17, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_UNMUTE(4)},
+        {0x17, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_UNMUTE(0)}, /* master */
+        {0x17, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_MUTE(1)},
+        {0x17, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_MUTE(2)},
+        {0x17, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_MUTE(3)},
+        {0x17, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_MUTE(4)},
 
         /*
          * Set up output mixers (0x19 - 0x1b)
@@ -543,6 +547,14 @@ static int via_init(struct hda_codec *codec)
         return 0;
 }
 
+#ifdef CONFIG_SND_HDA_POWER_SAVE
+static int via_check_power_status(struct hda_codec *codec, hda_nid_t nid)
+{
+        struct via_spec *spec = codec->spec;
+        return snd_hda_check_amp_list_power(codec, &spec->loopback, nid);
+}
+#endif
+
 /*
  */
 static struct hda_codec_ops via_patch_ops = {
@@ -550,6 +562,9 @@ static struct hda_codec_ops via_patch_ops = {
         .build_pcms = via_build_pcms,
         .init = via_init,
         .free = via_free,
+#ifdef CONFIG_SND_HDA_POWER_SAVE
+        .check_power_status = via_check_power_status,
+#endif
 };
 
 /* fill in the dac_nids table from the parsed pin configuration */
@@ -738,6 +753,16 @@ static int vt1708_auto_create_analog_input_ctls(struct via_spec *spec,
         return 0;
 }
 
+#ifdef CONFIG_SND_HDA_POWER_SAVE
+static struct hda_amp_list vt1708_loopbacks[] = {
+        { 0x17, HDA_INPUT, 1 },
+        { 0x17, HDA_INPUT, 2 },
+        { 0x17, HDA_INPUT, 3 },
+        { 0x17, HDA_INPUT, 4 },
+        { } /* end */
+};
+#endif
+
 static int vt1708_parse_auto_config(struct hda_codec *codec)
 {
         struct via_spec *spec = codec->spec;
@@ -831,6 +856,9 @@ static int patch_vt1708(struct hda_codec *codec)
         codec->patch_ops = via_patch_ops;
 
         codec->patch_ops.init = via_auto_init;
+#ifdef CONFIG_SND_HDA_POWER_SAVE
+        spec->loopback.amplist = vt1708_loopbacks;
+#endif
 
         return 0;
 }
@@ -871,15 +899,15 @@ static struct hda_verb vt1709_10ch_volume_init_verbs[] = {
         {0x16, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_UNMUTE(0)},
 
 
-        /* Unmute input amps (CD, Line In, Mic 1 & Mic 2) of the analog-loopback
+        /* Mute input amps (CD, Line In, Mic 1 & Mic 2) of the analog-loopback
          * mixer widget
          */
         /* Amp Indices: AOW0=0, CD = 1, Mic1 = 2, Line = 3, Mic2 = 4 */
-        {0x18, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_UNMUTE(0)},
-        {0x18, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_UNMUTE(1)},
-        {0x18, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_UNMUTE(2)},
-        {0x18, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_UNMUTE(3)},
-        {0x18, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_UNMUTE(4)},
+        {0x18, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_UNMUTE(0)}, /* unmute master */
+        {0x18, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_MUTE(1)},
+        {0x18, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_MUTE(2)},
+        {0x18, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_MUTE(3)},
+        {0x18, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_MUTE(4)},
 
         /*
          * Set up output selector (0x1a, 0x1b, 0x29)
@@ -1227,6 +1255,16 @@ static int vt1709_parse_auto_config(struct hda_codec *codec)
         return 1;
 }
 
+#ifdef CONFIG_SND_HDA_POWER_SAVE
+static struct hda_amp_list vt1709_loopbacks[] = {
+        { 0x18, HDA_INPUT, 1 },
+        { 0x18, HDA_INPUT, 2 },
+        { 0x18, HDA_INPUT, 3 },
+        { 0x18, HDA_INPUT, 4 },
+        { } /* end */
+};
+#endif
+
 static int patch_vt1709_10ch(struct hda_codec *codec)
 {
         struct via_spec *spec;
@@ -1269,6 +1307,9 @@ static int patch_vt1709_10ch(struct hda_codec *codec)
         codec->patch_ops = via_patch_ops;
 
         codec->patch_ops.init = via_auto_init;
+#ifdef CONFIG_SND_HDA_POWER_SAVE
+        spec->loopback.amplist = vt1709_loopbacks;
+#endif
 
         return 0;
 }
@@ -1359,6 +1400,9 @@ static int patch_vt1709_6ch(struct hda_codec *codec)
         codec->patch_ops = via_patch_ops;
 
         codec->patch_ops.init = via_auto_init;
+#ifdef CONFIG_SND_HDA_POWER_SAVE
+        spec->loopback.amplist = vt1709_loopbacks;
+#endif
 
         return 0;
 }