From a479b44ac0a0ac25cd48e5356200078924d78022 Mon Sep 17 00:00:00 2001
From: Richard Fitzgerald <rf@opensource.cirrus.com>
Date: Wed, 13 Sep 2023 16:00:11 +0100
Subject: [PATCH] ASoC: cs42l42: Don't rely on GPIOD_OUT_LOW to set RESET
initially low
The ACPI setting for a GPIO default state has higher priority than the
flag passed to devm_gpiod_get_optional() so ACPI can override the
GPIOD_OUT_LOW. Explicitly set the GPIO low when hard resetting.
Although GPIOD_OUT_LOW can't be relied on this doesn't seem like a
reason to stop passing it to devm_gpiod_get_optional(). So we still pass
it to state our intent, but can deal with it having no effect.
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20230913150012.604775-3-sbinding@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---
sound/soc/codecs/cs42l42.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/sound/soc/codecs/cs42l42.c b/sound/soc/codecs/cs42l42.c
index 56d2857a4f01c..dc93861ddfb02 100644
--- a/sound/soc/codecs/cs42l42.c
+++ b/sound/soc/codecs/cs42l42.c
@@ -2321,6 +2321,12 @@ int cs42l42_common_probe(struct cs42l42_private *cs42l42,
if (cs42l42->reset_gpio) {
dev_dbg(cs42l42->dev, "Found reset GPIO\n");
+ /*
+ * ACPI can override the default GPIO state we requested
+ * so ensure that we start with RESET low.
+ */
+ gpiod_set_value_cansleep(cs42l42->reset_gpio, 0);
+
/* Ensure minimum reset pulse width */
usleep_range(10, 500);