Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757387AbdIIHJe (ORCPT ); Sat, 9 Sep 2017 03:09:34 -0400 Received: from mga11.intel.com ([192.55.52.93]:31780 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751807AbdIIHJc (ORCPT ); Sat, 9 Sep 2017 03:09:32 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.42,365,1500966000"; d="scan'208";a="309754969" Date: Sat, 9 Sep 2017 10:09:29 +0300 From: Mika Westerberg To: Mario Limonciello Cc: dvhart@infradead.org, LKML , platform-driver-x86@vger.kernel.org, Richard Hughes , Yehezkel Bernat Subject: Re: [PATCH v3] Add driver to force WMI Thunderbolt controller power status 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 Content-Disposition: inline In-Reply-To: <1504884191-16528-1-git-send-email-mario.limonciello@dell.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo User-Agent: Mutt/1.8.3 (2017-05-23) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 820 Lines: 18 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