According to Ilitek "231x & ILI251x Programming Guide" Version: 2.30 "2.1. Power Sequence", "T4 Chip Reset and discharge time" is minimum 10ms and "T2 Chip initial time" is maximum 150ms. Adjust the reset timings such that T4 is 15ms and T2 is 160ms to fit those figures.
This prevents sporadic touch controller start up failures when some systems with at least ILI251x controller boot, without this patch the systems sometimes fail to communicate with the touch controller.
Fixes: 201f3c803544c ("Input: ili210x - add reset GPIO support") Signed-off-by: Marek Vasut marex@denx.de Cc: Dmitry Torokhov dmitry.torokhov@gmail.com --- drivers/input/touchscreen/ili210x.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/input/touchscreen/ili210x.c b/drivers/input/touchscreen/ili210x.c index 2bd407d86bae5..131cb648a82ae 100644 --- a/drivers/input/touchscreen/ili210x.c +++ b/drivers/input/touchscreen/ili210x.c @@ -951,9 +951,9 @@ static int ili210x_i2c_probe(struct i2c_client *client, if (error) return error;
- usleep_range(50, 100); + msleep(15); gpiod_set_value_cansleep(reset_gpio, 0); - msleep(100); + msleep(160); }
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);