From patchwork Wed Jul 25 03:41:22 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Len Brown X-Patchwork-Id: 1235001 Return-Path: X-Original-To: patchwork-linux-acpi@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 42C553FD4F for ; Wed, 25 Jul 2012 03:50:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932885Ab2GYDua (ORCPT ); Tue, 24 Jul 2012 23:50:30 -0400 Received: from mail-qa0-f46.google.com ([209.85.216.46]:62253 "EHLO mail-qa0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932907Ab2GYDmv (ORCPT ); Tue, 24 Jul 2012 23:42:51 -0400 Received: by mail-qa0-f46.google.com with SMTP id b17so2268265qad.19 for ; Tue, 24 Jul 2012 20:42:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:from:to:cc:subject:date:message-id:x-mailer:in-reply-to :references:in-reply-to:references:reply-to:organization; bh=hw+nIvMtjGUuCFsWJo2I2B0RtF6L5n7ADEUAL7DtjT0=; b=e2YZ0dV6mlQ6qd3AfmpVjIo5UUHxnZ+ea3LzV2fCHNqiJ7OG55uxE1U9V6mg94Qia9 4XD9qD41JuQUuYNXI12F/mr0jjki33kXAAABtXvbJvsJNXlMyvWxIMhaB9cwj10wWqHR JqOZ1JQNVT1yvIAcySJbJ4R/DVavmzIr5R7Pxg0uQFzZ9zUF5VDr/o/fXFlk9HWaTEKr MnoH0+BKGDRybD1V3PzSbgPHlucpSsSPt4/xnBW5LNJOgTZSl3HHJ3pvwid8zpeATcHO 2rr41IJKL6Bv2epBWVNCpQb8dRVN5tfhIcMguiqM2kXYeCaIhaBbkgcTsZ52Lzdn6xhY QdIA== Received: by 10.224.77.11 with SMTP id e11mr35333494qak.95.1343187770712; Tue, 24 Jul 2012 20:42:50 -0700 (PDT) Received: from x980.localdomain6 (h184-61-125-197.altnnh.dsl.dynamic.tds.net. [184.61.125.197]) by mx.google.com with ESMTPS id et6sm15489186qab.8.2012.07.24.20.42.49 (version=SSLv3 cipher=OTHER); Tue, 24 Jul 2012 20:42:49 -0700 (PDT) From: Len Brown To: linux-acpi@vger.kernel.org, linux-pm@lists.linux-foundation.org Cc: linux-kernel@vger.kernel.org, Huang Ying , Len Brown Subject: [PATCH 26/52] ACPI, PM, Specify lowest allowed state for device sleep state Date: Tue, 24 Jul 2012 23:41:22 -0400 Message-Id: <27d7c86ccd58722021c4667b1c967eb39343e6fc.1343187617.git.len.brown@intel.com> X-Mailer: git-send-email 1.7.12.rc0 In-Reply-To: <1343187708-19532-1-git-send-email-lenb@kernel.org> References: <1343187708-19532-1-git-send-email-lenb@kernel.org> In-Reply-To: <6af1c4fc5227af65092ebc848989693562bfa3e8.1343187617.git.len.brown@intel.com> References: <6af1c4fc5227af65092ebc848989693562bfa3e8.1343187617.git.len.brown@intel.com> Reply-To: Len Brown Organization: Intel Open Source Technology Center Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org From: Huang Ying Lower device sleep state can save more power, but has more exit latency too. Sometimes, to satisfy some power QoS and other requirement, we need to constrain the lowest device sleep state. In this patch, a parameter to specify lowest allowed state for acpi_pm_device_sleep_state is added. So that the caller can enforce the constraint via the parameter. This is needed by PCIe D3cold support, where the lowest power state allowed may be D3_HOT instead of default D3_COLD. Changelog: v2: - Minor change per Rafeal's comments Signed-off-by: Huang Ying Signed-off-by: Len Brown --- drivers/acpi/sleep.c | 24 +++++++++++++++++++----- drivers/pci/pci-acpi.c | 3 ++- drivers/pnp/pnpacpi/core.c | 4 ++-- include/acpi/acpi_bus.h | 6 +++--- 4 files changed, 26 insertions(+), 11 deletions(-) diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c index 74ee4ab..6f3f34c 100644 --- a/drivers/acpi/sleep.c +++ b/drivers/acpi/sleep.c @@ -675,8 +675,9 @@ int acpi_suspend(u32 acpi_state) * @dev: device to examine; its driver model wakeup flags control * whether it should be able to wake up the system * @d_min_p: used to store the upper limit of allowed states range - * Return value: preferred power state of the device on success, -ENODEV on - * failure (ie. if there's no 'struct acpi_device' for @dev) + * @d_max_in: specify the lowest allowed states + * Return value: preferred power state of the device on success, -ENODEV + * (ie. if there's no 'struct acpi_device' for @dev) or -EINVAL on failure * * Find the lowest power (highest number) ACPI device power state that * device @dev can be in while the system is in the sleep state represented @@ -691,13 +692,15 @@ int acpi_suspend(u32 acpi_state) * via @wake. */ -int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p) +int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in) { acpi_handle handle = DEVICE_ACPI_HANDLE(dev); struct acpi_device *adev; char acpi_method[] = "_SxD"; unsigned long long d_min, d_max; + if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3) + return -EINVAL; if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { printk(KERN_DEBUG "ACPI handle has no context!\n"); return -ENODEV; @@ -705,8 +708,10 @@ int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p) acpi_method[2] = '0' + acpi_target_sleep_state; /* - * If the sleep state is S0, we will return D3, but if the device has - * _S0W, we will use the value from _S0W + * If the sleep state is S0, the lowest limit from ACPI is D3, + * but if the device has _S0W, we will use the value from _S0W + * as the lowest limit from ACPI. Finally, we will constrain + * the lowest limit with the specified one. */ d_min = ACPI_STATE_D0; d_max = ACPI_STATE_D3; @@ -750,8 +755,17 @@ int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p) } } + if (d_max_in < d_min) + return -EINVAL; if (d_min_p) *d_min_p = d_min; + /* constrain d_max with specified lowest limit (max number) */ + if (d_max > d_max_in) { + for (d_max = d_max_in; d_max > d_min; d_max--) { + if (adev->power.states[d_max].flags.valid) + break; + } + } return d_max; } #endif /* CONFIG_PM */ diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c index 61e2fef..a9efebc 100644 --- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -189,7 +189,8 @@ static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev) { int acpi_state; - acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL); + acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, + ACPI_STATE_D3); if (acpi_state < 0) return PCI_POWER_ERROR; diff --git a/drivers/pnp/pnpacpi/core.c b/drivers/pnp/pnpacpi/core.c index d21e8f5..507a8e2 100644 --- a/drivers/pnp/pnpacpi/core.c +++ b/drivers/pnp/pnpacpi/core.c @@ -170,8 +170,8 @@ static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state) } if (acpi_bus_power_manageable(handle)) { - int power_state = acpi_pm_device_sleep_state(&dev->dev, NULL); - + int power_state = acpi_pm_device_sleep_state(&dev->dev, NULL, + ACPI_STATE_D3); if (power_state < 0) power_state = (state.event == PM_EVENT_ON) ? ACPI_STATE_D0 : ACPI_STATE_D3; diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index b0d6282..0545df4 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -414,13 +414,13 @@ int acpi_enable_wakeup_device_power(struct acpi_device *dev, int state); int acpi_disable_wakeup_device_power(struct acpi_device *dev); #ifdef CONFIG_PM -int acpi_pm_device_sleep_state(struct device *, int *); +int acpi_pm_device_sleep_state(struct device *, int *, int); #else -static inline int acpi_pm_device_sleep_state(struct device *d, int *p) +static inline int acpi_pm_device_sleep_state(struct device *d, int *p, int m) { if (p) *p = ACPI_STATE_D0; - return ACPI_STATE_D3; + return (m >= ACPI_STATE_D0 && m <= ACPI_STATE_D3) ? m : ACPI_STATE_D0; } #endif