From ca2cb85f2c95d7945d42761fc79fc1fa9df01099 Mon Sep 17 00:00:00 2001 From: Ondrej Jirman Date: Sat, 26 Nov 2022 15:18:14 +0100 Subject: [PATCH 420/480] 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 ceeb26069c8f..e4e266f1b70f 100644 --- a/drivers/input/keyboard/pinephone-keyboard.c +++ b/drivers/input/keyboard/pinephone-keyboard.c @@ -350,6 +350,8 @@ static int ppkb_probe(struct i2c_client *client) 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; -- 2.49.0