Add a reset function that toggles the reset line if available or uses the software reset command otherwise. Use this in probe to ensure the registers are in a sane state. This is useful when the driver module is reloaded, or after Kexec, warm-reboots, etc..
Signed-off-by: Andrew F. Davis <[email protected]> --- sound/soc/codecs/tlv320aic31xx.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/sound/soc/codecs/tlv320aic31xx.c b/sound/soc/codecs/tlv320aic31xx.c index e58b7a4e0402..98e9ba3ee708 100644 --- a/sound/soc/codecs/tlv320aic31xx.c +++ b/sound/soc/codecs/tlv320aic31xx.c @@ -1037,6 +1037,24 @@ static int aic31xx_set_dai_sysclk(struct snd_soc_dai *codec_dai, return 0; } +static int aic31xx_reset(struct aic31xx_priv *aic31xx) +{ + int ret = 0; + + if (aic31xx->gpio_reset) { + gpiod_set_value(aic31xx->gpio_reset, 1); + ndelay(10); /* At least 10ns */ + gpiod_set_value(aic31xx->gpio_reset, 0); + } else { + ret = regmap_write(aic31xx->regmap, AIC31XX_RESET, 1); + if (ret < 0) + dev_err(aic31xx->dev, "Could not reset device\n"); + } + mdelay(1); /* At least 1ms */ + + return ret; +} + static int aic31xx_regulator_event(struct notifier_block *nb, unsigned long event, void *data) { @@ -1362,6 +1380,9 @@ static int aic31xx_i2c_probe(struct i2c_client *i2c, return ret; } + /* Reset device registers for a consistent power-on like state */ + aic31xx_reset(aic31xx); + if (aic31xx->codec_type & DAC31XX_BIT) return snd_soc_register_codec(&i2c->dev, &soc_codec_driver_aic31xx, -- 2.15.0
