ASoC: Add debug output tracing all cache register writes

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

sound/soc/soc-cache.c

@@ -44,6 +44,8 @@ static int snd_soc_4_12_write(struct snd_soc_codec *codec, unsigned int reg,
 		return 0;
 	}
 
+	dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
+
 	ret = codec->hw_write(codec->control_data, data, 2);
 	if (ret == 2)
 		return 0;
@@ -112,6 +114,8 @@ static int snd_soc_7_9_write(struct snd_soc_codec *codec, unsigned int reg,
 		return 0;
 	}
 
+	dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
+
 	ret = codec->hw_write(codec->control_data, data, 2);
 	if (ret == 2)
 		return 0;
@@ -171,6 +175,8 @@ static int snd_soc_8_8_write(struct snd_soc_codec *codec, unsigned int reg,
 		return 0;
 	}
 
+	dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
+
 	if (codec->hw_write(codec->control_data, data, 2) == 2)
 		return 0;
 	else
@@ -205,6 +211,8 @@ static int snd_soc_8_16_write(struct snd_soc_codec *codec, unsigned int reg,
 		return 0;
 	}
 
+	dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
+
 	if (codec->hw_write(codec->control_data, data, 3) == 3)
 		return 0;
 	else
@@ -362,6 +370,8 @@ static int snd_soc_16_8_write(struct snd_soc_codec *codec, unsigned int reg,
 		return 0;
 	}
 
+	dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
+
 	ret = codec->hw_write(codec->control_data, data, 3);
 	if (ret == 3)
 		return 0;
@@ -472,6 +482,8 @@ static int snd_soc_16_16_write(struct snd_soc_codec *codec, unsigned int reg,
 		return 0;
 	}
 
+	dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
+
 	ret = codec->hw_write(codec->control_data, data, 4);
 	if (ret == 4)
 		return 0;