From 081fa8779b8365f4bb2efe1c0ff79ceb31bef6ec Mon Sep 17 00:00:00 2001 From: Ondrej Jirman Date: Sat, 26 Nov 2022 15:18:14 +0100 Subject: [PATCH 375/391] input: pinephone-keyboard: Wait a bit after enabling vbus In case the MCU was browned out, we want to wait a bit after enabling VBUS and before probing the MCU over I2C, for the MCU to initialize. Otherwise it may be possible for the MCU to fail to respond during probe and for the driver to fail initialization. Signed-off-by: Ondrej Jirman --- drivers/input/keyboard/pinephone-keyboard.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/input/keyboard/pinephone-keyboard.c b/drivers/input/keyboard/pinephone-keyboard.c index ee4c26a1b..6717dd1b3 100644 --- a/drivers/input/keyboard/pinephone-keyboard.c +++ b/drivers/input/keyboard/pinephone-keyboard.c @@ -368,6 +368,8 @@ static int ppkb_probe(struct i2c_client *client) if (error) return error; + mdelay(100); + ret = i2c_smbus_read_i2c_block_data(client, 0, sizeof(info), info); if (ret != sizeof(info)) { error = ret < 0 ? ret : -EIO; -- 2.35.3