From patchwork Thu May 8 22:42:47 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 4139101 Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 32CBCBFF02 for ; Thu, 8 May 2014 22:26:40 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 40B81202E9 for ; Thu, 8 May 2014 22:26:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 069FE2014A for ; Thu, 8 May 2014 22:26:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756146AbaEHW0g (ORCPT ); Thu, 8 May 2014 18:26:36 -0400 Received: from v094114.home.net.pl ([79.96.170.134]:60959 "HELO v094114.home.net.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1755669AbaEHW0f (ORCPT ); Thu, 8 May 2014 18:26:35 -0400 Received: from afdb188.neoplus.adsl.tpnet.pl [95.49.79.188] (HELO vostro.rjw.lan) by serwer1319399.home.pl [79.96.170.134] with SMTP (IdeaSmtpServer v0.80) id f39c4b4af9fcef35; Fri, 9 May 2014 00:26:33 +0200 From: "Rafael J. Wysocki" To: Alan Stern Cc: Linux PM list , Mika Westerberg , Aaron Lu , ACPI Devel Maling List , LKML , Ulf Hansson Subject: [RFC][PATCH 3/3] ACPI / PM: Avoid resuming devices in ACPI PM domain during system suspend Date: Fri, 09 May 2014 00:42:47 +0200 Message-ID: <1931580.ReS9Ax8b3R@vostro.rjw.lan> User-Agent: KMail/4.11.5 (Linux/3.14.0-rc7+; KDE/4.11.5; x86_64; ; ) In-Reply-To: <4232134.uNVe9bptuo@vostro.rjw.lan> References: <2356017.WpDFDYKWcr@vostro.rjw.lan> <4232134.uNVe9bptuo@vostro.rjw.lan> MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Rafael J. Wysocki Rework the ACPI PM domain's PM callbacks to avoid resuming devices during system suspend (in order to modify their wakeup settings etc.) if that isn't necessary. Signed-off-by: Rafael J. Wysocki --- drivers/acpi/device_pm.c | 46 ++++++++++++++++++++++++++++++++++++++++++---- drivers/acpi/scan.c | 4 ++++ include/acpi/acpi_bus.h | 3 ++- 3 files changed, 48 insertions(+), 5 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-pm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Index: linux-pm/drivers/acpi/device_pm.c =================================================================== --- linux-pm.orig/drivers/acpi/device_pm.c +++ linux-pm/drivers/acpi/device_pm.c @@ -907,20 +907,44 @@ int acpi_subsys_prepare(struct device *d if (dev->power.ignore_children) pm_runtime_resume(dev); + pm_set_direct_resume(dev, true); return pm_generic_prepare(dev); } EXPORT_SYMBOL_GPL(acpi_subsys_prepare); /** - * acpi_subsys_suspend - Run the device driver's suspend callback. + * acpi_subsys_suspend - Handle device suspend stage of system suspend. * @dev: Device to handle. - * - * Follow PCI and resume devices suspended at run time before running their - * system suspend callbacks. */ int acpi_subsys_suspend(struct device *dev) { + struct acpi_device *adev = ACPI_COMPANION(dev); + u32 sys_target; + + if (!adev || !pm_runtime_enabled_and_suspended(dev)) { + pm_set_direct_resume(dev, false); + goto out; + } + if (!pm_direct_resume_is_set(dev) + || device_may_wakeup(dev) != !!adev->wakeup.prepare_count) + goto resume; + + sys_target = acpi_target_system_state(); + if (sys_target != ACPI_STATE_S0) { + int ret, state; + + if (adev->power.flags.dsw_present) + goto resume; + + ret = acpi_dev_pm_get_state(dev, adev, sys_target, NULL, &state); + if (!ret && state == adev->power.state) + return 0; + } + + resume: pm_runtime_resume(dev); + + out: return pm_generic_suspend(dev); } @@ -954,6 +978,19 @@ int acpi_subsys_resume_early(struct devi EXPORT_SYMBOL_GPL(acpi_subsys_resume_early); /** + * acpi_subsys_resume - Handle device resume stage of system resume. + * @dev: Device to handle. + */ +int acpi_subsys_resume(struct device *dev) +{ + if (pm_direct_resume_is_set(dev)) { + pm_runtime_resume(dev); + return 0; + } + return pm_generic_resume(dev); +} + +/** * acpi_subsys_freeze - Run the device driver's freeze callback. * @dev: Device to handle. */ @@ -982,6 +1019,7 @@ static struct dev_pm_domain acpi_general .suspend = acpi_subsys_suspend, .suspend_late = acpi_subsys_suspend_late, .resume_early = acpi_subsys_resume_early, + .resume = acpi_subsys_resume, .freeze = acpi_subsys_freeze, .poweroff = acpi_subsys_suspend, .poweroff_late = acpi_subsys_suspend_late, Index: linux-pm/include/acpi/acpi_bus.h =================================================================== --- linux-pm.orig/include/acpi/acpi_bus.h +++ linux-pm/include/acpi/acpi_bus.h @@ -261,7 +261,8 @@ struct acpi_device_power_flags { u32 inrush_current:1; /* Serialize Dx->D0 */ u32 power_removed:1; /* Optimize Dx->D0 */ u32 ignore_parent:1; /* Power is independent of parent power state */ - u32 reserved:27; + u32 dsw_present:1; /* _DSW present? */ + u32 reserved:26; }; struct acpi_device_power_state { Index: linux-pm/drivers/acpi/scan.c =================================================================== --- linux-pm.orig/drivers/acpi/scan.c +++ linux-pm/drivers/acpi/scan.c @@ -1551,9 +1551,13 @@ static void acpi_bus_get_power_flags(str */ if (acpi_has_method(device->handle, "_PSC")) device->power.flags.explicit_get = 1; + if (acpi_has_method(device->handle, "_IRC")) device->power.flags.inrush_current = 1; + if (acpi_has_method(device->handle, "_DSW")) + device->power.flags.dsw_present = 1; + /* * Enumerate supported power management states */