linux-kernel - [PATCH] ASoC: tas5805m: fix pdn polarity

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Message-Id: <20220309104104.3605112-1-john@metanate.com>
Date:   Wed,  9 Mar 2022 10:41:04 +0000
From:   John Keeping <john@...anate.com>
To:     alsa-devel@...a-project.org
Cc:     John Keeping <john@...anate.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Daniel Beer <daniel.beer@...rinstitute.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] ASoC: tas5805m: fix pdn polarity

The binding defines the GPIO as "pdn-gpios" so when the GPIO is active
the expectation is that the power down signal is asserted, but the
driver swaps this to represent the inverted logic of the electrical
signal.

The GPIO_ACTIVE_HIGH/LOW flags should be used to identify the inverted
logic here with the driver treating power down as active when the mapped
GPIO value is 1.

Fixes: ec45268467f4 ("ASoC: add support for TAS5805M digital amplifier")
Signed-off-by: John Keeping <john@...anate.com>
---
 sound/soc/codecs/tas5805m.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/sound/soc/codecs/tas5805m.c b/sound/soc/codecs/tas5805m.c
index fa0e81ec875a..12146a860ef8 100644
--- a/sound/soc/codecs/tas5805m.c
+++ b/sound/soc/codecs/tas5805m.c
@@ -155,7 +155,7 @@ static const uint32_t tas5805m_volume[] = {
 
 struct tas5805m_priv {
 	struct regulator		*pvdd;
-	struct gpio_desc		*gpio_pdn_n;
+	struct gpio_desc		*gpio_pdn;
 
 	uint8_t				*dsp_cfg_data;
 	int				dsp_cfg_len;
@@ -444,11 +444,11 @@ static int tas5805m_i2c_probe(struct i2c_client *i2c)
 
 	dev_set_drvdata(dev, tas5805m);
 	tas5805m->regmap = regmap;
-	tas5805m->gpio_pdn_n = devm_gpiod_get(dev, "pdn", GPIOD_OUT_LOW);
-	if (IS_ERR(tas5805m->gpio_pdn_n)) {
+	tas5805m->gpio_pdn = devm_gpiod_get(dev, "pdn", GPIOD_OUT_HIGH);
+	if (IS_ERR(tas5805m->gpio_pdn)) {
 		dev_err(dev, "error requesting PDN gpio: %ld\n",
-			PTR_ERR(tas5805m->gpio_pdn_n));
-		return PTR_ERR(tas5805m->gpio_pdn_n);
+			PTR_ERR(tas5805m->gpio_pdn));
+		return PTR_ERR(tas5805m->gpio_pdn);
 	}
 
 	/* This configuration must be generated by PPC3. The file loaded
@@ -505,7 +505,7 @@ static int tas5805m_i2c_probe(struct i2c_client *i2c)
 	}
 
 	usleep_range(100000, 150000);
-	gpiod_set_value(tas5805m->gpio_pdn_n, 1);
+	gpiod_set_value(tas5805m->gpio_pdn, 0);
 	usleep_range(10000, 15000);
 
 	/* Don't register through devm. We need to be able to unregister
@@ -515,7 +515,7 @@ static int tas5805m_i2c_probe(struct i2c_client *i2c)
 					 &tas5805m_dai, 1);
 	if (ret < 0) {
 		dev_err(dev, "unable to register codec: %d\n", ret);
-		gpiod_set_value(tas5805m->gpio_pdn_n, 0);
+		gpiod_set_value(tas5805m->gpio_pdn, 1);
 		regulator_disable(tas5805m->pvdd);
 		return ret;
 	}
@@ -529,7 +529,7 @@ static int tas5805m_i2c_remove(struct i2c_client *i2c)
 	struct tas5805m_priv *tas5805m = dev_get_drvdata(dev);
 
 	snd_soc_unregister_component(dev);
-	gpiod_set_value(tas5805m->gpio_pdn_n, 0);
+	gpiod_set_value(tas5805m->gpio_pdn, 1);
 	usleep_range(10000, 15000);
 	regulator_disable(tas5805m->pvdd);
 	return 0;
-- 
2.35.1