ASoC: wm8971: Convert to snd_soc_cache_sync

Convert to snd_soc_cache_sync for sync reg_cache with the hardware.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/wm8971.c

@@ -546,6 +546,9 @@ static int wm8971_set_bias_level(struct snd_soc_codec *codec,
 	case SND_SOC_BIAS_PREPARE:
 		break;
 	case SND_SOC_BIAS_STANDBY:
+		if (codec->dapm.bias_level == SND_SOC_BIAS_OFF)
+			snd_soc_cache_sync(codec);
+
 		/* mute dac and set vmid to 500k, enable VREF */
 		snd_soc_write(codec, WM8971_PWR1, pwr_reg | 0x0140);
 		break;
@@ -605,20 +608,8 @@ static int wm8971_suspend(struct snd_soc_codec *codec, pm_message_t state)
 
 static int wm8971_resume(struct snd_soc_codec *codec)
 {
-	int i;
-	u8 data[2];
-	u16 *cache = codec->reg_cache;
 	u16 reg;
 
-	/* Sync reg_cache with the hardware */
-	for (i = 0; i < ARRAY_SIZE(wm8971_reg); i++) {
-		if (i == WM8971_RESET)
-			continue;
-		data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
-		data[1] = cache[i] & 0x00ff;
-		codec->hw_write(codec->control_data, data, 2);
-	}
-
 	wm8971_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 
 	/* charge wm8971 caps */