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>

1 files changed, 18 insertions, 0 deletions

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 4ca5e56388a3..39a63f958db1 100644
--- 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)