From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932664AbaDXWZh (ORCPT ); Thu, 24 Apr 2014 18:25:37 -0400 Received: from v094114.home.net.pl ([79.96.170.134]:59596 "HELO v094114.home.net.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1755865AbaDXWYF (ORCPT ); Thu, 24 Apr 2014 18:24:05 -0400 From: "Rafael J. Wysocki" To: Alan Stern Cc: Linux PM list , Mika Westerberg , Aaron Lu , ACPI Devel Maling List , LKML Subject: [RFC][PATCH 3/3] ACPI / PM: Avoid resuming devices in ACPI PM domain during system suspend Date: Fri, 25 Apr 2014 00:40:19 +0200 Message-ID: <4342989.eRN4reU3Xe@vostro.rjw.lan> User-Agent: KMail/4.11.5 (Linux/3.14.0-rc7+; KDE/4.11.5; x86_64; ; ) In-Reply-To: <5039115.7hOuWtlQhG@vostro.rjw.lan> References: <5039115.7hOuWtlQhG@vostro.rjw.lan> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="utf-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 | 33 ++++++++++++++++++++++++++++++--- drivers/acpi/scan.c | 4 ++++ include/acpi/acpi_bus.h | 3 ++- 3 files changed, 36 insertions(+), 4 deletions(-) Index: linux-pm/drivers/acpi/device_pm.c =================================================================== --- linux-pm.orig/drivers/acpi/device_pm.c +++ linux-pm/drivers/acpi/device_pm.c @@ -907,6 +907,7 @@ int acpi_subsys_prepare(struct device *d if (dev->power.ignore_children) pm_runtime_resume(dev); + dev->power.resume_not_needed = true; return pm_generic_prepare(dev); } EXPORT_SYMBOL_GPL(acpi_subsys_prepare); @@ -914,13 +915,39 @@ EXPORT_SYMBOL_GPL(acpi_subsys_prepare); /** * acpi_subsys_suspend - Run the device driver's suspend callback. * @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)) + goto out; + + if (!dev->power.resume_not_needed + || 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) + goto resume; + } + + dev->power.use_runtime_resume = true; + return 0; + + resume: pm_runtime_resume(dev); + + out: + dev->power.resume_not_needed = false; return pm_generic_suspend(dev); } 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 */