Sebastian Reichel ca1cd36cef Input: atmel_mxt_ts - fix reset-gpio for level based irqs
The current reset-gpio support triggers an interrupt storm on platforms
using the maxtouch with level based interrupt. The Motorola Droid 4,
which I used for some of the tests is not affected, since it uses a edge
based interrupt.

This change avoids the interrupt storm by enabling the device while its
interrupt is disabled. Afterwards we wait 100ms. This is important for
two reasons: The device is unresponsive for some time (~22ms for
mxt224E) and the CHG (interrupt) line is not working properly for 100ms.
We don't need to wait for any following interrupts, since the following
mxt_initialize() checks for bootloader mode anyways.

This fixes a boot issue on GE PPD (watchdog kills device due to
interrupt storm) and does not cause regression on Motorola Droid 4.

Fixes: f657b00df22e ("Input: atmel_mxt_ts - add support for reset line")
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Reviewed-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2018-05-24 09:56:47 -07:00
..
2017-04-05 08:52:33 -07:00
2017-08-18 17:15:13 -07:00
2018-05-24 09:30:15 -07:00
2018-02-02 16:04:10 -08:00
2016-01-02 21:08:53 -08:00
2018-03-14 09:56:31 -07:00
2016-03-02 09:40:20 -08:00
2017-02-12 14:55:08 -08:00