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Input: ili210x - fix reset timing

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commit e4920d42ce 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: 201f3c8035 ("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>
This commit is contained in:
Marek Vasut 2022-05-18 14:28:32 -07:00 • committed by Greg Kroah-Hartman
commit d30fdf7d13
1 changed files with 2 additions and 2 deletions
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4
drivers/input/touchscreen/ili210x.c
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@ -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);