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authorTimur Tabi <timur@freescale.com>2008-08-07 12:22:32 -0400
committerMark Brown <broonie@opensource.wolfsonmicro.com>2008-10-30 11:54:11 -0400
commit0c235d1e837c142b7565814318b6ba5917d5ac32 (patch)
tree5b9d136a7840ffeb91022fbb7c70de9d7b0a1d17
parentca53fb24dd21bff32c4b41b2be1035a1adfc0135 (diff)
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>
-rw-r--r--sound/soc/codecs/cs4270.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/sound/soc/codecs/cs4270.c b/sound/soc/codecs/cs4270.c
index 0bbd94501d7e..0ff476d7057c 100644
--- a/sound/soc/codecs/cs4270.c
+++ b/sound/soc/codecs/cs4270.c
@@ -450,6 +450,19 @@ static int cs4270_hw_params(struct snd_pcm_substream *substream,
450 return ret; 450 return ret;
451 } 451 }
452 452
453 /* Disable automatic volume control. It's enabled by default, and
454 * it causes volume change commands to be delayed, sometimes until
455 * after playback has started.
456 */
457
458 reg = cs4270_read_reg_cache(codec, CS4270_TRANS);
459 reg &= ~(CS4270_TRANS_SOFT | CS4270_TRANS_ZERO);
460 ret = cs4270_i2c_write(codec, CS4270_TRANS, reg);
461 if (ret < 0) {
462 printk(KERN_ERR "I2C write failed\n");
463 return ret;
464 }
465
453 /* Thaw and power-up the codec */ 466 /* Thaw and power-up the codec */
454 467
455 ret = snd_soc_write(codec, CS4270_PWRCTL, 0); 468 ret = snd_soc_write(codec, CS4270_PWRCTL, 0);