linux-kernel - [PATCH] ASoC: sgtl5000: Reset the CHIP_CLK

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Message-Id: <20221110190612.1341469-1-detlev.casanova@collabora.com>
Date:   Thu, 10 Nov 2022 14:06:12 -0500
From:   Detlev Casanova <detlev.casanova@...labora.com>
To:     linux-kernel@...r.kernel.org
Cc:     Fabio Estevam <festevam@...il.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        alsa-devel@...a-project.org (moderated list:NXP SGTL5000 DRIVER),
        Detlev Casanova <detlev.casanova@...labora.com>
Subject: [PATCH] ASoC: sgtl5000: Reset the CHIP_CLK_CTRL reg on remove

Since commit bf2aebccddef ("ASoC: sgtl5000: Fix noise on shutdown/remove"),
the device power control registers are reset when the driver is
removed/shutdown.

This is an issue when the device is configured to use the PLL clock. The
device will stop responding if it is still configured to use the PLL
clock but the PLL clock is powered down.

When rebooting linux, the probe function will show:
sgtl5000 0-000a: Error reading chip id -11

Make sure that the CHIP_CLK_CTRL is reset to its default value before
powering down the device.

Fixes: bf2aebccddef ("ASoC: sgtl5000: Fix noise on shutdown/remove")
Signed-off-by: Detlev Casanova <detlev.casanova@...labora.com>
---
 sound/soc/codecs/sgtl5000.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c
index 4b2135eba74d..a916f4619ea3 100644
--- a/sound/soc/codecs/sgtl5000.c
+++ b/sound/soc/codecs/sgtl5000.c
@@ -1794,6 +1794,7 @@ static void sgtl5000_i2c_remove(struct i2c_client *client)
 {
 	struct sgtl5000_priv *sgtl5000 = i2c_get_clientdata(client);
 
+	regmap_write(sgtl5000->regmap, SGTL5000_CHIP_CLK_CTRL, SGTL5000_CHIP_CLK_CTRL_DEFAULT);
 	regmap_write(sgtl5000->regmap, SGTL5000_CHIP_DIG_POWER, SGTL5000_DIG_POWER_DEFAULT);
 	regmap_write(sgtl5000->regmap, SGTL5000_CHIP_ANA_POWER, SGTL5000_ANA_POWER_DEFAULT);
 
-- 
2.38.1