Commit 551cf601 authored by Hans de Goede's avatar Hans de Goede Committed by sanglipeng
Browse files

Input: goodix - try resetting the controller when no config is set

stable inclusion
from stable-v5.10.157
commit c1620e996d0a4ed7a3001cca755cff013944850d
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7MU59

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=c1620e996d0a4ed7a3001cca755cff013944850d



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[ Upstream commit c7e37cc6 ]

On ACPI systems (irq_pin_access_method == IRQ_PIN_ACCESS_ACPI_*) the driver
does not reset the controller at probe time, because sometimes the system
firmware loads a config and resetting might loose this config.

On the Nanote UMPC-01 device OTOH the config is in flash of the controller,
the controller needs a reset to load this; and the system firmware does not
reset the controller on a cold boot.

To fix the Nanote UMPC-01 touchscreen not working on a cold boot, try
resetting the controller and then re-reading the config when encountering
a config with 0 width/height/max_touch_num value and the controller has
not already been reset by goodix_ts_probe().

This should be safe to do in general because normally we should never
encounter a config with 0 width/height/max_touch_num. Doing this in
general not only avoids the need for a DMI quirk, but also might help
other systems.

Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Reviewed-by: default avatarBastien Nocera <hadess@hadess.net>
Link: https://lore.kernel.org/r/20221025122930.421377-2-hdegoede@redhat.com


Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
Signed-off-by: default avatarsanglipeng <sanglipeng1@jd.com>
parent 8fb051f0
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