From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mika Westerberg Subject: Re: [PATCH v3] Add driver to force WMI Thunderbolt controller power status Date: Sat, 9 Sep 2017 10:09:29 +0300 Message-ID: <20170909070929.GH2477@lahna.fi.intel.com> References: <1504884191-16528-1-git-send-email-mario.limonciello@dell.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <1504884191-16528-1-git-send-email-mario.limonciello@dell.com> Sender: linux-kernel-owner@vger.kernel.org To: Mario Limonciello Cc: dvhart@infradead.org, LKML , platform-driver-x86@vger.kernel.org, Richard Hughes , Yehezkel Bernat List-Id: platform-driver-x86.vger.kernel.org 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 Reviewed-by: Mika Westerberg