From acffeb2865956abbf9791a6ae8bac5e183595c50 Mon Sep 17 00:00:00 2001 From: Ondrej Jirman Date: Sat, 26 Nov 2022 15:18:14 +0100 Subject: [PATCH 394/469] 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 ee4c26a1b08a..6717dd1b3437 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; -- 2.34.1