[PATCH 5.10 018/126] ASoC: cs42l42: Always wait at least 3ms after reset

Greg Kroah-Hartman
2021-04-05T09:08:41Z

From: Lucas Tanure <tanureal@opensource.cirrus.com>

[ Upstream commit 19325cfea04446bc79b36bffd4978af15f46a00e ]

This delay is part of the power-up sequence defined in the datasheet.
A runtime_resume is a power-up so must also include the delay.

Signed-off-by: Lucas Tanure <tanureal@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20210305173442.195740-6-tanureal@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
sound/soc/codecs/cs42l42.c | 3 ++-
sound/soc/codecs/cs42l42.h | 1 +
2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/cs42l42.c b/sound/soc/codecs/cs42l42.c
index d5078ce79fad..4d82d24c7828 100644
--- a/sound/soc/codecs/cs42l42.c
+++ b/sound/soc/codecs/cs42l42.c
@@ -1794,7 +1794,7 @@ static int cs42l42_i2c_probe(struct i2c_client *i2c_client,
dev_dbg(&i2c_client->dev, "Found reset GPIO\n");
gpiod_set_value_cansleep(cs42l42->reset_gpio, 1);
}
- mdelay(3);
+ usleep_range(CS42L42_BOOT_TIME_US, CS42L42_BOOT_TIME_US * 2);

/* Request IRQ */
ret = devm_request_threaded_irq(&i2c_client->dev,
@@ -1919,6 +1919,7 @@ static int cs42l42_runtime_resume(struct device *dev)
}

gpiod_set_value_cansleep(cs42l42->reset_gpio, 1);
+ usleep_range(CS42L42_BOOT_TIME_US, CS42L42_BOOT_TIME_US * 2);

regcache_cache_only(cs42l42->regmap, false);
regcache_sync(cs42l42->regmap);
diff --git a/sound/soc/codecs/cs42l42.h b/sound/soc/codecs/cs42l42.h
index 9b017b76828a..866d7c873e3c 100644
--- a/sound/soc/codecs/cs42l42.h
+++ b/sound/soc/codecs/cs42l42.h
@@ -740,6 +740,7 @@
#define CS42L42_FRAC2_VAL(val) (((val) & 0xff0000) >> 16)

#define CS42L42_NUM_SUPPLIES 5
+#define CS42L42_BOOT_TIME_US 3000

static const char *const cs42l42_supply_names[CS42L42_NUM_SUPPLIES] = {
"VA",
--
2.30.1