ASoC: Take a pm_runtime reference on DAPM devices that are enabled

As for PCMs take a runtime power management reference to devices that are
in a non-off bias, avoiding the need to do this in individual drivers.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/soc-dapm.c

@@ -39,6 +39,7 @@
 #include <linux/platform_device.h>
 #include <linux/jiffies.h>
 #include <linux/debugfs.h>
+#include <linux/pm_runtime.h>
 #include <linux/slab.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
@@ -1206,6 +1207,9 @@ static void dapm_pre_sequence_async(void *data, async_cookie_t cookie)
 	/* If we're off and we're not supposed to be go into STANDBY */
 	if (d->bias_level == SND_SOC_BIAS_OFF &&
 	    d->target_bias_level != SND_SOC_BIAS_OFF) {
+		if (d->dev)
+			pm_runtime_get_sync(d->dev);
+
 		ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_STANDBY);
 		if (ret != 0)
 			dev_err(d->dev,
@@ -1245,6 +1249,9 @@ static void dapm_post_sequence_async(void *data, async_cookie_t cookie)
 		ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_OFF);
 		if (ret != 0)
 			dev_err(d->dev, "Failed to turn off bias: %d\n", ret);
+
+		if (d->dev)
+			pm_runtime_put_sync(d->dev);
 	}
 
 	/* If we just powered up then move to active bias */