From: Jack Yu jack.yu@realtek.com
Add module parameter "power_up_delay" to fix pop noise on capture. The power_up_delay value is set with a default value of 400ms, smaller values are not recommended.
BugLink: https://github.com/thesofproject/linux/issues/1969 Reviewed-by: Bard Liao yung-chuan.liao@linux.intel.com Reviewed-by: Rander Wang rander.wang@linux.intel.com Signed-off-by: Jack Yu jack.yu@realtek.com Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com --- sound/soc/codecs/rt715.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/sound/soc/codecs/rt715.c b/sound/soc/codecs/rt715.c index 099c8bd20006..0cf10dec1e3b 100644 --- a/sound/soc/codecs/rt715.c +++ b/sound/soc/codecs/rt715.c @@ -37,6 +37,10 @@
#include "rt715.h"
+static int power_up_delay = 400; +module_param(power_up_delay, int, 0444); +MODULE_PARM_DESC(power_up_delay, "RT715 power up delay time in ms"); + static int rt715_index_write(struct regmap *regmap, unsigned int reg, unsigned int value) { @@ -498,6 +502,7 @@ static int rt715_set_bias_level(struct snd_soc_component *component, regmap_write(rt715->regmap, RT715_SET_AUDIO_POWER_STATE, AC_PWRST_D0); + msleep(power_up_delay); } break;