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ASoC: tlv320aic31xx: Reset registers during power up

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Add a reset function that toggles the reset line if available or uses
the software reset command otherwise. Use this in power up 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@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Andrew F. Davis 2017-12-07 09:38:56 -06:00 committed by Mark Brown
parent cd15da88c3
commit 0ce918c9e0
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GPG Key ID: 24D68B725D5487D0
1 changed files with 22 additions and 4 deletions
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26
sound/soc/codecs/tlv320aic31xx.c
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@ -1055,6 +1055,22 @@ static int aic31xx_regulator_event(struct notifier_block *nb,
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);
}
mdelay(1); /* At least 1ms */
return ret;
}
static void aic31xx_clk_on(struct snd_soc_codec *codec)
{
struct aic31xx_priv *aic31xx = snd_soc_codec_get_drvdata(codec);
@ -1098,11 +1114,13 @@ static int aic31xx_power_on(struct snd_soc_codec *codec)
if (ret)
return ret;
if (aic31xx->gpio_reset) {
gpiod_set_value(aic31xx->gpio_reset, 0);
udelay(100);
}
regcache_cache_only(aic31xx->regmap, false);
/* Reset device registers for a consistent power-on like state */
ret = aic31xx_reset(aic31xx);
if (ret < 0)
dev_err(aic31xx->dev, "Could not reset device: %d\n", ret);
ret = regcache_sync(aic31xx->regmap);
if (ret) {
dev_err(codec->dev,