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Copies the common/env_ctrl support code from the it8728f driver.
Tested on an ASUS AM1I-A using Linux 4.16.7-gentoo as payload,
and booting userspace without a kexec call.
Prior to this change, an error was given during boot:
it87 it87.656: Detected broken BIOS defaults, disabling PWM interface
After this change, the message is gone, and PWM fan control works
through the /sys/class/hwmon interface.
Change-Id: Id97c4ec19562e7c78308c5afe6ff7c938922c9e7
Signed-off-by: Kevin Cody-Little <kcodyjr@gmail.com>
Reviewed-on: https://review.coreboot.org/26224
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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