From: Marek Vasut marex@denx.de
commit e4920d42ce0e9c8aafb7f64b6d9d4ae02161e51e upstream.
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 12ms 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 Link: https://lore.kernel.org/r/20220518204901.93534-1-marex@denx.de Cc: stable@vger.kernel.org Signed-off-by: Dmitry Torokhov dmitry.torokhov@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/input/touchscreen/ili210x.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/input/touchscreen/ili210x.c +++ b/drivers/input/touchscreen/ili210x.c @@ -951,9 +951,9 @@ static int ili210x_i2c_probe(struct i2c_ if (error) return error;
- usleep_range(50, 100); + usleep_range(12000, 15000); gpiod_set_value_cansleep(reset_gpio, 0); - msleep(100); + msleep(160); }
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);