]> git.baikalelectronics.ru Git - kernel.git/commit
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 07:57:36 +0000 (09:57 +0200)
commitcdf2283e71315725f96157262e94d8029fcc71ca
treee469c54037547cdb394fae6cbba50f6b1076c072
parent96980fda28d43f7b7ee9234261735a05220c2b78
Input: ili210x - fix reset timing

commit e995dd92935d5b03ac8709e7fc5802f70dc0d7dd 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: ae15a2f6828b0 ("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