ALSA: hda - Add snd_hda_check_power_state() helper function

... for small refactoring.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_codec.c

@@ -3779,18 +3779,13 @@ static void sync_power_up_states(struct hda_codec *codec)
 
 	for (i = 0; i < codec->num_nodes; i++, nid++) {
 		unsigned int wcaps = get_wcaps(codec, nid);
-		unsigned int state, target;
+		unsigned int target;
 		if (!(wcaps & AC_WCAP_POWER))
 			continue;
 		target = codec->power_filter(codec, nid, AC_PWRST_D0);
 		if (target == AC_PWRST_D0)
 			continue;
-		state = snd_hda_codec_read(codec, nid, 0,
-					   AC_VERB_GET_POWER_STATE, 0);
-		if (state & AC_PWRST_ERROR)
-			continue;
-		state = (state >> 4) & 0x0f;
-		if (state != target)
+		if (!snd_hda_check_power_state(codec, nid, target))
 			snd_hda_codec_write(codec, nid, 0,
 					    AC_VERB_SET_POWER_STATE, target);
 	}

sound/pci/hda/hda_local.h

@@ -657,6 +657,19 @@ int snd_hda_check_amp_list_power(struct hda_codec *codec,
 				 struct hda_loopback_check *check,
 				 hda_nid_t nid);
 
+/* check whether the actual power state matches with the target state */
+static inline bool
+snd_hda_check_power_state(struct hda_codec *codec, hda_nid_t nid,
+			  unsigned int target_state)
+{
+	unsigned int state = snd_hda_codec_read(codec, nid, 0,
+						AC_VERB_GET_POWER_STATE, 0);
+	if (state & AC_PWRST_ERROR)
+		return true;
+	state = (state >> 4) & 0x0f;
+	return (state != target_state);
+}
+
 /*
  * AMP control callbacks
  */

sound/pci/hda/patch_via.c

@@ -240,10 +240,7 @@ static void set_widgets_power_state(struct hda_codec *codec)
 static void update_power_state(struct hda_codec *codec, hda_nid_t nid,
 			       unsigned int parm)
 {
-	unsigned int state = snd_hda_codec_read(codec, nid, 0,
-						AC_VERB_GET_POWER_STATE, 0);
-	state = (state >> 4) & 0x0f;
-	if (state == parm)
+	if (snd_hda_check_power_state(codec, nid, parm))
 		return;
 	snd_hda_codec_write(codec, nid, 0, AC_VERB_SET_POWER_STATE, parm);
 }
@@ -253,10 +250,8 @@ static void update_conv_power_state(struct hda_codec *codec, hda_nid_t nid,
 {
 	struct via_spec *spec = codec->spec;
 	unsigned int format;
-	unsigned int state = snd_hda_codec_read(codec, nid, 0,
-						AC_VERB_GET_POWER_STATE, 0);
-	state = (state >> 4) & 0x0f;
-	if (state == parm)
+
+	if (snd_hda_check_power_state(codec, nid, parm))
 		return;
 	format = snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_CONV, 0);
 	if (format && (spec->dac_stream_tag[index] != format))