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ASoC: sgtl5000: Fix noise on shutdown/remove 

Put the SGTL5000 in a silent/safe state on shutdown/remove, this is
required since the SGTL5000 produces a constant noise on its output
after it is configured and its clock is removed. Without this change
this is happening every time the module is unbound/removed or from
reboot till the clock is enabled again.

The issue was experienced on both a Toradex Colibri/Apalis iMX6, but can
be easily reproduced everywhere just playing something on the codec and
after that removing/unbinding the driver.

Fixes: 9b34e6cc3b ("ASoC: Add Freescale SGTL5000 codec support")
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: Fabio Estevam <festevam@denx.de>
Link: https://lore.kernel.org/r/20220624101301.441314-1-francesco.dolcini@toradex.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Francesco Dolcini 2022-06-24 12:13:01 +02:00 committed by Mark Brown
parent 980555e95f
commit 040e3360af
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
2 changed files with 10 additions and 0 deletions
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9
sound/soc/codecs/sgtl5000.c
View File

@ -1795,6 +1795,9 @@ static int sgtl5000_i2c_remove(struct i2c_client *client)
{
struct sgtl5000_priv *sgtl5000 = i2c_get_clientdata(client);
regmap_write(sgtl5000->regmap, SGTL5000_CHIP_DIG_POWER, SGTL5000_DIG_POWER_DEFAULT);
regmap_write(sgtl5000->regmap, SGTL5000_CHIP_ANA_POWER, SGTL5000_ANA_POWER_DEFAULT);
clk_disable_unprepare(sgtl5000->mclk);
regulator_bulk_disable(sgtl5000->num_supplies, sgtl5000->supplies);
regulator_bulk_free(sgtl5000->num_supplies, sgtl5000->supplies);
@ -1802,6 +1805,11 @@ static int sgtl5000_i2c_remove(struct i2c_client *client)
return 0;
}
static void sgtl5000_i2c_shutdown(struct i2c_client *client)
{
sgtl5000_i2c_remove(client);
}
static const struct i2c_device_id sgtl5000_id[] = {
{"sgtl5000", 0},
{},
@ -1822,6 +1830,7 @@ static struct i2c_driver sgtl5000_i2c_driver = {
},
.probe_new = sgtl5000_i2c_probe,
.remove = sgtl5000_i2c_remove,
.shutdown = sgtl5000_i2c_shutdown,
.id_table = sgtl5000_id,
};

1
sound/soc/codecs/sgtl5000.h
View File

@ -80,6 +80,7 @@
/*
* SGTL5000_CHIP_DIG_POWER
*/
#define SGTL5000_DIG_POWER_DEFAULT 0x0000
#define SGTL5000_ADC_EN 0x0040
#define SGTL5000_DAC_EN 0x0020
#define SGTL5000_DAP_POWERUP 0x0010