linux-kernel - Re: [PATCH v3] Add driver to force WMI Thunderbolt controller power status

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Date:   Sat, 9 Sep 2017 10:09:29 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Mario Limonciello <mario.limonciello@...l.com>
Cc:     dvhart@...radead.org, LKML <linux-kernel@...r.kernel.org>,
        platform-driver-x86@...r.kernel.org,
        Richard Hughes <hughsient@...il.com>,
        Yehezkel Bernat <yehezkelshb@...il.com>
Subject: Re: [PATCH v3] Add driver to force WMI Thunderbolt controller power
 status

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@...l.com>

Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>