From: Marek Vasut marex@denx.de
stable inclusion from stable-v5.10.118 commit d30fdf7d1343da4fc585308eb44cfd2a4276956a category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5L686
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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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 Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Acked-by: Xie XiuQi xiexiuqi@huawei.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 30576a5f2f04..f437eefec94a 100644 --- a/drivers/input/touchscreen/ili210x.c +++ b/drivers/input/touchscreen/ili210x.c @@ -420,9 +420,9 @@ 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);