ASoC: Add debug trace for bias level transitions

A standard way of making sure we know when the bias level changes.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 4ca5e56388a3884dc95b40002f6393d0f65097d8..39a63f958db1824a5b38a1b23289dc2b2012922c 100644 (file)
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -110,6 +110,24 @@ static int snd_soc_dapm_set_bias_level(struct snd_soc_device *socdev,
        struct snd_soc_codec *codec = socdev->card->codec;
        int ret = 0;
 
+       switch (level) {
+       case SND_SOC_BIAS_ON:
+               dev_dbg(socdev->dev, "Setting full bias\n");
+               break;
+       case SND_SOC_BIAS_PREPARE:
+               dev_dbg(socdev->dev, "Setting bias prepare\n");
+               break;
+       case SND_SOC_BIAS_STANDBY:
+               dev_dbg(socdev->dev, "Setting standby bias\n");
+               break;
+       case SND_SOC_BIAS_OFF:
+               dev_dbg(socdev->dev, "Setting bias off\n");
+               break;
+       default:
+               dev_err(socdev->dev, "Setting invalid bias %d\n", level);
+               return -EINVAL;
+       }
+
        if (card->set_bias_level)
                ret = card->set_bias_level(card, level);
        if (ret == 0 && codec->set_bias_level)