1 files changed, 29 insertions, 6 deletions

diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
index b56ca4019392..e5fdb64eb02c 100644
--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -534,6 +534,22 @@ static int stac92xx_build_pcms(struct hda_codec *codec)
         return 0;
 }
 
+static unsigned int stac92xx_get_vref(struct hda_codec *codec, hda_nid_t nid)
+{
+        unsigned int pincap = snd_hda_param_read(codec, nid,
+                                                 AC_PAR_PIN_CAP);
+        pincap = (pincap & AC_PINCAP_VREF) >> AC_PINCAP_VREF_SHIFT;
+        if (pincap & AC_PINCAP_VREF_100)
+                return AC_PINCTL_VREF_100;
+        if (pincap & AC_PINCAP_VREF_80)
+                return AC_PINCTL_VREF_80;
+        if (pincap & AC_PINCAP_VREF_50)
+                return AC_PINCTL_VREF_50;
+        if (pincap & AC_PINCAP_VREF_GRD)
+                return AC_PINCTL_VREF_GRD;
+        return 0;
+}
+
 static void stac92xx_auto_set_pinctl(struct hda_codec *codec, hda_nid_t nid, int pin_type)
 
 {
@@ -571,9 +587,12 @@ static int stac92xx_io_switch_put(struct snd_kcontrol *kcontrol, struct snd_ctl_
 
         if (val)
                 stac92xx_auto_set_pinctl(codec, nid, AC_PINCTL_OUT_EN);
-        else
-                stac92xx_auto_set_pinctl(codec, nid, AC_PINCTL_IN_EN);
-
+        else {
+                unsigned int pinctl = AC_PINCTL_IN_EN;
+                if (io_idx) /* set VREF for mic */
+                        pinctl |= stac92xx_get_vref(codec, nid);
+                stac92xx_auto_set_pinctl(codec, nid, pinctl);
+        }
         return 1;
 }
 
@@ -951,9 +970,13 @@ static int stac92xx_init(struct hda_codec *codec)
                 stac92xx_auto_init_hp_out(codec);
         }
         for (i = 0; i < AUTO_PIN_LAST; i++) {
-                if (cfg->input_pins[i])
-                        stac92xx_auto_set_pinctl(codec, cfg->input_pins[i],
-                                                 AC_PINCTL_IN_EN);
+                hda_nid_t nid = cfg->input_pins[i];
+                if (nid) {
+                        unsigned int pinctl = AC_PINCTL_IN_EN;
+                        if (i == AUTO_PIN_MIC || i == AUTO_PIN_FRONT_MIC)
+                                pinctl |= stac92xx_get_vref(codec, nid);
+                        stac92xx_auto_set_pinctl(codec, nid, pinctl);
+                }
         }
         if (cfg->dig_out_pin)
                 stac92xx_auto_set_pinctl(codec, cfg->dig_out_pin,