ALSA: hda - Add snd_hda_shutup_pins() helper function

Add a common helper function for clearing pin controls before suspend.
Use the pincfg array instead of looking through all widget tree.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_codec.c

@@ -899,6 +899,25 @@ static void restore_pincfgs(struct hda_codec *codec)
 	}
 }
 
+/**
+ * snd_hda_shutup_pins - Shut up all pins
+ * @codec: the HDA codec
+ *
+ * Clear all pin controls to shup up before suspend for avoiding click noise.
+ * The controls aren't cached so that they can be resumed properly.
+ */
+void snd_hda_shutup_pins(struct hda_codec *codec)
+{
+	int i;
+	for (i = 0; i < codec->init_pins.used; i++) {
+		struct hda_pincfg *pin = snd_array_elem(&codec->init_pins, i);
+		/* use read here for syncing after issuing each verb */
+		snd_hda_codec_read(codec, pin->nid, 0,
+				   AC_VERB_SET_PIN_WIDGET_CONTROL, 0);
+	}
+}
+EXPORT_SYMBOL_HDA(snd_hda_shutup_pins);
+
 static void init_hda_cache(struct hda_cache_rec *cache,
 			   unsigned int record_size);
 static void free_hda_cache(struct hda_cache_rec *cache);

sound/pci/hda/hda_codec.h

@@ -898,6 +898,7 @@ int snd_hda_codec_set_pincfg(struct hda_codec *codec, hda_nid_t nid,
 			     unsigned int cfg);
 int snd_hda_add_pincfg(struct hda_codec *codec, struct snd_array *list,
 		       hda_nid_t nid, unsigned int cfg); /* for hwdep */
+void snd_hda_shutup_pins(struct hda_codec *codec);
 
 /*
  * Mixer

sound/pci/hda/patch_sigmatel.c

@@ -4385,18 +4385,8 @@ static void stac92xx_free_kctls(struct hda_codec *codec)
 static void stac92xx_shutup(struct hda_codec *codec)
 {
 	struct sigmatel_spec *spec = codec->spec;
-	int i;
-	hda_nid_t nid;
 
-	/* reset each pin before powering down DAC/ADC to avoid click noise */
-	nid = codec->start_nid;
-	for (i = 0; i < codec->num_nodes; i++, nid++) {
-		unsigned int wcaps = get_wcaps(codec, nid);
-		unsigned int wid_type = get_wcaps_type(wcaps);
-		if (wid_type == AC_WID_PIN)
-			snd_hda_codec_read(codec, nid, 0,
-				AC_VERB_SET_PIN_WIDGET_CONTROL, 0);
-	}
+	snd_hda_shutup_pins(codec);
 
 	if (spec->eapd_mask)
 		stac_gpio_set(codec, spec->gpio_mask,