Re: [PATCH v3] Add driver to force WMI Thunderbolt controller power status
From: Mika Westerberg
Date: Sat Sep 09 2017 - 03:09:39 EST
On Fri, Sep 08, 2017 at 10:23:11AM -0500, Mario Limonciello wrote:
> Current implementations of Intel Thunderbolt controllers will go
> into a low power mode when not in use.
> Many machines containing these controllers also have a GPIO wired up
> that can force the controller awake. This is offered via a ACPI-WMI
> interface intended to be manipulated by a userspace utility.
> This mechanism is provided by Intel to OEMs to include in BIOS.
> It uses an industry wide GUID that is populated in a separate _WDG
> entry with no binary MOF.
> This interface allows software such as fwupd to wake up thunderbolt
> controllers to query the firmware version or flash new firmware.
> Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxxx>
Reviewed-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>