From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754605AbYJCWAt (ORCPT ); Fri, 3 Oct 2008 18:00:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753275AbYJCWAi (ORCPT ); Fri, 3 Oct 2008 18:00:38 -0400 Received: from ogre.sisk.pl ([217.79.144.158]:41599 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753097AbYJCWAh (ORCPT ); Fri, 3 Oct 2008 18:00:37 -0400 From: "Rafael J. Wysocki" To: Len Brown Subject: [PATCH] ACPI Suspend: Enable ACPI during resume if SCI_EN is not set Date: Sat, 4 Oct 2008 00:05:05 +0200 User-Agent: KMail/1.9.9 Cc: ACPI Devel Maling List , LKML , Pavel Machek , pm list , Thomas Renninger MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-2" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200810040005.06220.rjw@sisk.pl> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rafael J. Wysocki ACPI Suspend: Enable ACPI during resume if SCI_EN is not set On some machines, like for example MSI Wind U100, the BIOS doesn't enable ACPI before returning control to the OS, which sometimes causes resume to fail. This is against the ACPI specification, which clearly states that "When the platform is waking from an S1, S2 or S3 state, OSPM assumes the hardware is already in the ACPI mode and will not issue an ACPI_ENABLE", but it won't hurt to check the SCI_EN bit and enable ACPI during resume from S3 if this bit is not set. Fortunately, we already have acpi_enable() for that, so use it in the resume code path, before executing _BFS, in analogy with the resume-from-hibernation code path. NOTE: We aren't supposed to set SCI_EN directly, because it's owned by the hardware. Signed-off-by: Rafael J. Wysocki --- drivers/acpi/sleep/main.c | 2 ++ 1 file changed, 2 insertions(+) Index: linux-2.6/drivers/acpi/sleep/main.c =================================================================== --- linux-2.6.orig/drivers/acpi/sleep/main.c +++ linux-2.6/drivers/acpi/sleep/main.c @@ -200,6 +200,8 @@ static int acpi_suspend_enter(suspend_st break; } + /* If ACPI is not enabled by the BIOS, we need to enable it here. */ + acpi_enable(); /* Reprogram control registers and execute _BFS */ acpi_leave_sleep_state_prep(acpi_state);