Input: ili210x - fix reset timing
authorMarek Vasut <marex@denx.de>
Wed, 18 May 2022 21:28:32 +0000 (14:28 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 25 May 2022 07:14:38 +0000 (09:14 +0200)
commit36ac6caf742d9597a1ce3f2eeeb5de895fa75fd2
tree6fd1d9a966714b74a5f68bfa2331d6ec85c1ed6a
parent1c450bdf2e8cdc71094e10de36bedf34535428fb
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 <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