ASoC: da732x: Mark DC offset control registers volatile

The driver reads from the DC offset control registers during callibration
but since the registers are marked as volatile and there is a register
cache the values will not be read from the hardware after the first reading
rendering the callibration ineffective.

It appears that the driver was originally written for the ASoC level
register I/O code but converted to regmap prior to merge and this issue
was missed during the conversion as the framework level volatile register
functionality was not being used.

Signed-off-by: Mark Brown <broonie@linaro.org>
Acked-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
Cc: stable@vger.kernel.org

diff --git a/sound/soc/codecs/da732x.c b/sound/soc/codecs/da732x.c
index f295b65699105897743fad1ecbc4439a71e58f0e..f4d965ebc29e8320469becd09a3ac58a2668e8de 100644 (file)
--- a/sound/soc/codecs/da732x.c
+++ b/sound/soc/codecs/da732x.c
@@ -1268,11 +1268,23 @@ static struct snd_soc_dai_driver da732x_dai[] = {
        },
 };
 
+static bool da732x_volatile(struct device *dev, unsigned int reg)
+{
+       switch (reg) {
+       case DA732X_REG_HPL_DAC_OFF_CNTL:
+       case DA732X_REG_HPR_DAC_OFF_CNTL:
+               return true;
+       default:
+               return false;
+       }
+}
+
 static const struct regmap_config da732x_regmap = {
        .reg_bits               = 8,
        .val_bits               = 8,
 
        .max_register           = DA732X_MAX_REG,
+       .volatile_reg           = da732x_volatile,
        .reg_defaults           = da732x_reg_cache,
        .num_reg_defaults       = ARRAY_SIZE(da732x_reg_cache),
        .cache_type             = REGCACHE_RBTREE,