ASoC: wm8904: enable MCLK in STANDBY

MCLK input is needed when accessing any register after enabling SYSCLK.

This also fixes imbalance of clk_enable / clk_disable when transitioning
between ON -> STANDBY -> ON bias levels.
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/wm8904.c

@@ -1837,9 +1837,6 @@ static int wm8904_set_bias_level(struct snd_soc_component *component,
 
 	switch (level) {
 	case SND_SOC_BIAS_ON:
-		ret = clk_prepare_enable(wm8904->mclk);
-		if (ret)
-			return ret;
 		break;
 
 	case SND_SOC_BIAS_PREPARE:
@@ -1864,6 +1861,15 @@ static int wm8904_set_bias_level(struct snd_soc_component *component,
 				return ret;
 			}
 
+			ret = clk_prepare_enable(wm8904->mclk);
+			if (ret) {
+				dev_err(component->dev,
+					"Failed to enable MCLK: %d\n", ret);
+				regulator_bulk_disable(ARRAY_SIZE(wm8904->supplies),
+						       wm8904->supplies);
+				return ret;
+			}
+
 			regcache_cache_only(wm8904->regmap, false);
 			regcache_sync(wm8904->regmap);