linux-kernel - [PATCH 4.19 13/48] ASoC: sgtl5000: Fix noise on shutdown/remove

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Message-Id: <20220719114521.041462345@linuxfoundation.org>
Date:   Tue, 19 Jul 2022 13:53:50 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Francesco Dolcini <francesco.dolcini@...adex.com>,
        Fabio Estevam <festevam@...x.de>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 13/48] ASoC: sgtl5000: Fix noise on shutdown/remove

From: Francesco Dolcini <francesco.dolcini@...adex.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@...adex.com>
Reviewed-by: Fabio Estevam <festevam@...x.de>
Link: https://lore.kernel.org/r/20220624101301.441314-1-francesco.dolcini@toradex.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.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 17255e9683f5..13e752f8b3f7 100644
--- a/sound/soc/codecs/sgtl5000.c
+++ b/sound/soc/codecs/sgtl5000.c
@@ -1769,6 +1769,9 @@ 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);
@@ -1776,6 +1779,11 @@ 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},
 	{},
@@ -1796,6 +1804,7 @@ 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 066517e352a7..0ed4bad92cd1 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