From: Richard Fitzgerald rf@opensource.cirrus.com
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 --- 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 56d2857a4f01..dc93861ddfb0 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);