[PATCH 5.18 053/231] ASoC: sgtl5000: Fix noise on shutdown/remove

Greg Kroah-Hartman
2022-07-19T12:53:18Z

From: Francesco Dolcini <francesco.dolcini@toradex.com>

[ Upstream commit 040e3360af3736348112d29425bf5d0be5b93115 ]

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: 9b34e6cc3bc2 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
sound/soc/codecs/sgtl5000.c | 9 +++++++++
sound/soc/codecs/sgtl5000.h | 1 +
2 files changed, 10 insertions(+)

diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c
index 8eebf27d0ea2..281785a9301b 100644
--- a/sound/soc/codecs/sgtl5000.c
+++ b/sound/soc/codecs/sgtl5000.c
@@ -1796,6 +1796,9 @@ 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);
@@ -1803,6 +1806,11 @@ 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},
{},
@@ -1823,6 +1831,7 @@ static struct i2c_driver sgtl5000_i2c_driver = {
},
.probe = sgtl5000_i2c_probe,
.remove = sgtl5000_i2c_remove,
+ .shutdown = sgtl5000_i2c_shutdown,
.id_table = sgtl5000_id,
};

diff --git a/sound/soc/codecs/sgtl5000.h b/sound/soc/codecs/sgtl5000.h
index 56ec5863f250..3a808c762299 100644
--- a/sound/soc/codecs/sgtl5000.h
+++ b/sound/soc/codecs/sgtl5000.h
@@ -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
--
2.35.1