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 <afd@xxxxxx>
---
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
--
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