ACPI / LPSS: Ignore acpi_device_fix_up_power() return value
authorHans de Goede <hdegoede@redhat.com>
Sat, 8 Dec 2018 12:59:24 +0000 (13:59 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 5 Dec 2019 14:37:15 +0000 (15:37 +0100)
commit77cf4c5b45b0a9e6854e8e352dce55fa8769354c
treed7c04c6d05228dc2dc105dc5b737b6e34c59c775
parentc03e74b67b61b41fb62e518957f95fde18d3e6fa
ACPI / LPSS: Ignore acpi_device_fix_up_power() return value

[ Upstream commit 1a2fa02f7489dc4d746f2a15fb77b3ce1affade8 ]

Ignore acpi_device_fix_up_power() return value. If we return an error
we end up with acpi_default_enumeration() still creating a platform-
device for the device and we end up with the device still being used
but without the special LPSS related handling which is not useful.

Specicifically ignoring the error fixes the touchscreen no longer
working after a suspend/resume on a Prowise PT301 tablet.

This tablet has a broken _PS0 method on the touchscreen's I2C controller,
causing acpi_device_fix_up_power() to fail, causing fallback to standard
platform-dev handling and specifically causing acpi_lpss_save/restore_ctx
to not run.

The I2C controllers _PS0 method does actually turn on the device, but then
does some more nonsense which fails when run during early boot trying to
use I2C opregion handling on another not-yet registered I2C controller.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/acpi/acpi_lpss.c