This is a note to let you know that I've just added the patch titled
Input: ili210x - fix reset timing
to the 5.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
input-ili210x-fix-reset-timing.patch
and it can be found in the queue-5.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e4920d42ce0e9c8aafb7f64b6d9d4ae02161e51e Mon Sep 17 00:00:00 2001
From: Marek Vasut <marex@xxxxxxx>
Date: Wed, 18 May 2022 14:28:32 -0700
Subject: Input: ili210x - fix reset timing
From: Marek Vasut <marex@xxxxxxx>
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@xxxxxxx>
Link: https://lore.kernel.org/r/20220518204901.93534-1-marex@xxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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);
Patches currently in stable-queue which might be from marex@xxxxxxx are
queue-5.17/input-ili210x-fix-reset-timing.patch
