[ALSA] hda: STAC927x power down inactive DACs

On several laptops that have STAC9228 codecs have unused DACs,
this powers them down to a D3 state.

Signed-off-by: Matthew Ranostay <mranostay@embeddedalley.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 23 insertions, 1 deletions

diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
index f693011d25a0..7f506ef0accb 100644
--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -136,6 +136,7 @@ struct sigmatel_spec {
         /* power management */
         unsigned int num_pwrs;
         hda_nid_t *pwr_nids;
+        hda_nid_t *dac_list;
 
         /* playback */
         struct hda_input_mux *mono_mux;
@@ -291,6 +292,10 @@ static hda_nid_t stac927x_mux_nids[3] = {
         0x15, 0x16, 0x17
 };
 
+static hda_nid_t stac927x_dac_nids[6] = {
+        0x02, 0x03, 0x04, 0x05, 0x06, 0
+};
+
 static hda_nid_t stac927x_dmux_nids[1] = {
         0x1b,
 };
@@ -2877,6 +2882,18 @@ static int is_nid_hp_pin(struct auto_pin_cfg *cfg, hda_nid_t nid)
         return 0; /* nid is not a HP-Out */
 };
 
+static void stac92xx_power_down(struct hda_codec *codec)
+{
+        struct sigmatel_spec *spec = codec->spec;
+
+        /* power down inactive DACs */
+        hda_nid_t *dac;
+        for (dac = spec->dac_list; *dac; dac++)
+                if (!is_in_dac_nids(spec, *dac))
+                        snd_hda_codec_write_cache(codec, *dac, 0,
+                                        AC_VERB_SET_POWER_STATE, AC_PWRST_D3);
+}
+
 static int stac92xx_init(struct hda_codec *codec)
 {
         struct sigmatel_spec *spec = codec->spec;
@@ -2929,7 +2946,8 @@ static int stac92xx_init(struct hda_codec *codec)
                 enable_pin_detect(codec, spec->pwr_nids[i], event | i);
                 codec->patch_ops.unsol_event(codec, (event | i) << 26);
         }
-
+        if (spec->dac_list)
+                stac92xx_power_down(codec);
         if (cfg->dig_out_pin)
                 stac92xx_auto_set_pinctl(codec, cfg->dig_out_pin,
                                          AC_PINCTL_OUT_EN);
@@ -3102,6 +3120,9 @@ static int stac92xx_resume(struct hda_codec *codec)
                 spec->gpio_dir, spec->gpio_data);
         snd_hda_codec_resume_amp(codec);
         snd_hda_codec_resume_cache(codec);
+        /* power down inactive DACs */
+        if (spec->dac_list)
+                stac92xx_power_down(codec);
         /* invoke unsolicited event to reset the HP state */
         if (spec->hp_detect)
                 codec->patch_ops.unsol_event(codec, STAC_HP_EVENT << 26);
@@ -3589,6 +3610,7 @@ static int patch_stac927x(struct hda_codec *codec)
         spec->num_adcs = ARRAY_SIZE(stac927x_adc_nids);
         spec->mux_nids = stac927x_mux_nids;
         spec->num_muxes = ARRAY_SIZE(stac927x_mux_nids);
+        spec->dac_list = stac927x_dac_nids;
         spec->multiout.dac_nids = spec->dac_nids;
 
         switch (spec->board_config) {