ASoC: Disable automatic volume control in the CS4270 sound driver
Disable the automatic volume control feature of the CS4270 audio codec. This
feature, which is enabled by default, causes volume change commands to be
delayed. Sometimes the volume change happens after playback is started.
Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/cs4270.c b/sound/soc/codecs/cs4270.c
index 0bbd945..0ff476d 100644
--- a/sound/soc/codecs/cs4270.c
+++ b/sound/soc/codecs/cs4270.c
@@ -450,6 +450,19 @@
return ret;
}
+ /* Disable automatic volume control. It's enabled by default, and
+ * it causes volume change commands to be delayed, sometimes until
+ * after playback has started.
+ */
+
+ reg = cs4270_read_reg_cache(codec, CS4270_TRANS);
+ reg &= ~(CS4270_TRANS_SOFT | CS4270_TRANS_ZERO);
+ ret = cs4270_i2c_write(codec, CS4270_TRANS, reg);
+ if (ret < 0) {
+ printk(KERN_ERR "I2C write failed\n");
+ return ret;
+ }
+
/* Thaw and power-up the codec */
ret = snd_soc_write(codec, CS4270_PWRCTL, 0);