From 36ac6caf742d9597a1ce3f2eeeb5de895fa75fd2 Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Wed, 18 May 2022 14:28:32 -0700 Subject: [PATCH] Input: ili210x - fix reset timing 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 Link: https://lore.kernel.org/r/20220518204901.93534-1-marex@denx.de Cc: stable@vger.kernel.org Signed-off-by: Dmitry Torokhov Signed-off-by: Greg Kroah-Hartman --- 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 22839dde1d09..bc6f6a2ac4b9 100644 --- a/drivers/input/touchscreen/ili210x.c +++ b/drivers/input/touchscreen/ili210x.c @@ -290,9 +290,9 @@ static int ili210x_i2c_probe(struct i2c_client *client, 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);