From patchwork Wed Mar 27 13:52:54 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rajagopal Venkat X-Patchwork-Id: 2350771 Return-Path: X-Original-To: patchwork-linux-pm@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 3DB8B400E6 for ; Wed, 27 Mar 2013 13:54:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752209Ab3C0Nxv (ORCPT ); Wed, 27 Mar 2013 09:53:51 -0400 Received: from mail-pb0-f49.google.com ([209.85.160.49]:62182 "EHLO mail-pb0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751643Ab3C0Nxt (ORCPT ); Wed, 27 Mar 2013 09:53:49 -0400 Received: by mail-pb0-f49.google.com with SMTP id um15so1545906pbc.36 for ; Wed, 27 Mar 2013 06:53:48 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:from:to:cc:subject:date:message-id:x-mailer:in-reply-to :references:x-gm-message-state; bh=PJ/KgI8Ck1QuG9ifg/a0ceWvA52ZV7aOXTiM/jTpKPo=; b=jL4HrGk19DDy7uFJWmIbJznE87oF2e2xkZiK04o54k/cAEpe+wbrx2O0s/Kkxl0bHy eUIcCWyY+j17VEAQFMnjpg+LFraYrsnpKttNBuXGv2NRbhfDj0G4Y2qIfk6eBX94tpW3 O2xdvLqDhCcwXCo3YR/1Vivr2pFs2c+nJspTFwJp8U5tIlTWMPbh8s9xw3I811rjYZmT qOlcRBxJ8iS8E7Wnui88uVDnLG8swDWJ7o6guXCLKfiU7KIYIrdlN/QEc2tm6pp8zDn5 oi7j5fgRVaHP7BtFHiDHSCvklMtrR9Rq9kpVtUcqWYGihYDbZ3sBlBxQxhV7GaorxJz6 cilA== X-Received: by 10.67.3.39 with SMTP id bt7mr29649214pad.161.1364392428611; Wed, 27 Mar 2013 06:53:48 -0700 (PDT) Received: from localhost.localdomain ([115.242.178.247]) by mx.google.com with ESMTPS id ve7sm23501613pab.11.2013.03.27.06.53.42 (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 27 Mar 2013 06:53:47 -0700 (PDT) From: Rajagopal Venkat To: myungjoo.ham@samsung.com, rjw@sisk.pl, Kevin Hilman , Alan Stern Cc: patches@linaro.org, linaro-kernel@lists.linaro.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Rajagopal Venkat Subject: [PATCH v2 2/2] PM / devfreq: tie suspend/resume to runtime-pm Date: Wed, 27 Mar 2013 19:22:54 +0530 Message-Id: <1364392374-12236-3-git-send-email-rajagopal.venkat@linaro.org> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1364392374-12236-1-git-send-email-rajagopal.venkat@linaro.org> References: <1364392374-12236-1-git-send-email-rajagopal.venkat@linaro.org> X-Gm-Message-State: ALoCoQkDsIRFYIBF4ZuXCrNQu2g+4r7CwxP9SdmaxoZ75rDigwf5hdipUfcUcaQRmld90oVddH2+ Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Devfreq core suspend/resume of a device is explicitly handled by devfreq driver through devfreq_suspend_device() and devfreq_resume_device() apis typically called from runtime suspend/resume callbacks. This patch aims to take away this from devfreq drivers and handle it from runtime-pm core. So that device devfreq core suspend/resume is automatically done with runtime pm suspend/resume. The devfreq drivers shouldn't be concerned on when to suspend/resume the devfreq. This patch is targeted to handle devfreq core load monitoring suspend/resume only. Not the actual hardware itself. All the resources like clocks and regulators must still be handled by devfreq driver using runtime-pm. The sequence of devfreq and device runtime suspend/resume is, pm_runtime_suspend(dev) will first suspend device devfreq (if available) before device is suspended to ensure devfreq load monitoring is stopped and no device resources like clocks are accessed while device suspend is in progress. pm_runtime_resume(dev) will resume device devfreq(if available) after device is resumed to ensure device resources like clocks are ready for use. As devfreq suspend/resume is done automatically from runtime-pm, this patch removes the existing devfreq_suspend_device() and devfreq_resume_device() apis. Signed-off-by: Rajagopal Venkat --- drivers/base/power/runtime.c | 21 ++++++++++++- drivers/devfreq/devfreq.c | 69 +++++++++++++++++++++++++++++++++++++++--- include/linux/devfreq.h | 18 +++-------- include/linux/pm.h | 2 ++ 4 files changed, 91 insertions(+), 19 deletions(-) diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index 3148b10..2438abc 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -11,6 +11,7 @@ #include #include #include +#include #include "power.h" static int rpm_resume(struct device *dev, int rpmflags); @@ -406,6 +407,14 @@ static int rpm_suspend(struct device *dev, int rpmflags) __update_runtime_status(dev, RPM_SUSPENDING); + /* + * Try suspending devfreq before device is runtime suspended. + * It wouldn't make sense to continue devfreq load monitoring + * when device is runtime suspended. + */ + if (dev->power.devfreq && dev->power.devfreq->runtime_suspend) + dev->power.devfreq->runtime_suspend(dev); + if (dev->pm_domain) callback = dev->pm_domain->ops.runtime_suspend; else if (dev->type && dev->type->pm) @@ -421,8 +430,12 @@ static int rpm_suspend(struct device *dev, int rpmflags) callback = dev->driver->pm->runtime_suspend; retval = rpm_callback(callback, dev); - if (retval) + if (retval) { + /* Resume back devfreq on device suspend failure */ + if (dev->power.devfreq && dev->power.devfreq->runtime_resume) + dev->power.devfreq->runtime_resume(dev); goto fail; + } no_callback: __update_runtime_status(dev, RPM_SUSPENDED); @@ -661,6 +674,12 @@ static int rpm_resume(struct device *dev, int rpmflags) __update_runtime_status(dev, RPM_ACTIVE); if (parent) atomic_inc(&parent->power.child_count); + /* + * Resume devfreq after runtime resume sequence to ensure + * device resources are available for devfreq load monitoring. + */ + if (dev->power.devfreq && dev->power.devfreq->runtime_resume) + dev->power.devfreq->runtime_resume(dev); } wake_up_all(&dev->power.wait_queue); diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 44c4079..b8dab0d 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -25,6 +25,7 @@ #include #include #include +#include #include "governor.h" static struct class *devfreq_class; @@ -42,6 +43,9 @@ static LIST_HEAD(devfreq_governor_list); static LIST_HEAD(devfreq_list); static DEFINE_MUTEX(devfreq_list_lock); +static void devfreq_runtime_suspend(struct device *dev); +static void devfreq_runtime_resume(struct device *dev); + /** * find_device_devfreq() - find devfreq struct using device pointer * @dev: device pointer used to lookup device devfreq. @@ -387,6 +391,8 @@ static int devfreq_notifier_call(struct notifier_block *nb, unsigned long type, */ static void _remove_devfreq(struct devfreq *devfreq, bool skip) { + unsigned long flags; + mutex_lock(&devfreq_list_lock); if (IS_ERR(find_device_devfreq(devfreq->dev.parent))) { mutex_unlock(&devfreq_list_lock); @@ -400,6 +406,10 @@ static void _remove_devfreq(struct devfreq *devfreq, bool skip) devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_STOP, NULL); + spin_lock_irqsave(&devfreq->dev.parent->power.lock, flags); + devfreq->dev.parent->power.devfreq = NULL; + spin_unlock_irqrestore(&devfreq->dev.parent->power.lock, flags); + if (devfreq->profile->exit) devfreq->profile->exit(devfreq->dev.parent); @@ -442,6 +452,7 @@ struct devfreq *devfreq_add_device(struct device *dev, { struct devfreq *devfreq; struct devfreq_governor *governor; + unsigned long flags; int err = 0; if (!dev || !profile || !governor_name) { @@ -476,6 +487,12 @@ struct devfreq *devfreq_add_device(struct device *dev, devfreq->previous_freq = profile->initial_freq; devfreq->data = data; devfreq->nb.notifier_call = devfreq_notifier_call; + devfreq->runtime_suspend = devfreq_runtime_suspend; + devfreq->runtime_resume = devfreq_runtime_resume; + spin_lock_irqsave(&dev->power.lock, flags); + dev->power.devfreq = devfreq; + spin_unlock_irqrestore(&dev->power.lock, flags); + devfreq->trans_table = devm_kzalloc(dev, sizeof(unsigned int) * devfreq->profile->max_state * @@ -549,7 +566,7 @@ EXPORT_SYMBOL(devfreq_remove_device); * (e.g., runtime_suspend, suspend) of the device driver that * holds the devfreq. */ -int devfreq_suspend_device(struct devfreq *devfreq) +static int devfreq_suspend_device(struct devfreq *devfreq) { if (!devfreq) return -EINVAL; @@ -560,7 +577,6 @@ int devfreq_suspend_device(struct devfreq *devfreq) return devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_SUSPEND, NULL); } -EXPORT_SYMBOL(devfreq_suspend_device); /** * devfreq_resume_device() - Resume devfreq of a device. @@ -570,7 +586,7 @@ EXPORT_SYMBOL(devfreq_suspend_device); * (e.g., runtime_resume, resume) of the device driver that * holds the devfreq. */ -int devfreq_resume_device(struct devfreq *devfreq) +static int devfreq_resume_device(struct devfreq *devfreq) { if (!devfreq) return -EINVAL; @@ -581,7 +597,52 @@ int devfreq_resume_device(struct devfreq *devfreq) return devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_RESUME, NULL); } -EXPORT_SYMBOL(devfreq_resume_device); + +/** + * devfreq_runtime_suspend() - Suspend devfreq of a device. + * @dev: the device associated with devfreq + * + * This function is intended to be called by the runtime-pm + * core when the device associated with devfreq is + * runtime suspended. + */ +static void devfreq_runtime_suspend(struct device *dev) +{ + struct devfreq *devfreq; + int err; + + mutex_lock(&devfreq_list_lock); + devfreq = find_device_devfreq(dev); + mutex_unlock(&devfreq_list_lock); + + err = devfreq_suspend_device(devfreq); + if (err) + dev_err(dev, "devfreq runtime suspend failed with (%d) error\n", + err); +} + +/** + * devfreq_runtime_resume() - Resume devfreq of a device. + * @dev: the device associated with devfreq + * + * This function is intended to be called by the runtime-pm + * core when the device associated with devfreq is + * runtime resumed. + */ +static void devfreq_runtime_resume(struct device *dev) +{ + struct devfreq *devfreq; + int err; + + mutex_lock(&devfreq_list_lock); + devfreq = find_device_devfreq(dev); + mutex_unlock(&devfreq_list_lock); + + err = devfreq_resume_device(devfreq); + if (err) + dev_err(dev, "devfreq runtime resume failed with (%d) error\n", + err); +} /** * devfreq_add_governor() - Add devfreq governor diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h index 5f1ab92..669368b 100644 --- a/include/linux/devfreq.h +++ b/include/linux/devfreq.h @@ -140,6 +140,8 @@ struct devfreq_governor { * @trans_table: Statistics of devfreq transitions * @time_in_state: Statistics of devfreq states * @last_stat_updated: The last time stat updated + * @runtime_suspend: func to runtime suspend devfreq from runtime core + * @runtime_resume: func to runtime resume devfreq from runtime core * * This structure stores the devfreq information for a give device. * @@ -173,6 +175,8 @@ struct devfreq { unsigned int *trans_table; unsigned long *time_in_state; unsigned long last_stat_updated; + void (*runtime_suspend)(struct device *dev); + void (*runtime_resume)(struct device *dev); }; #if defined(CONFIG_PM_DEVFREQ) @@ -182,10 +186,6 @@ extern struct devfreq *devfreq_add_device(struct device *dev, void *data); extern int devfreq_remove_device(struct devfreq *devfreq); -/* Supposed to be called by PM_SLEEP/PM_RUNTIME callbacks */ -extern int devfreq_suspend_device(struct devfreq *devfreq); -extern int devfreq_resume_device(struct devfreq *devfreq); - /* Helper functions for devfreq user device driver with OPP. */ extern struct opp *devfreq_recommended_opp(struct device *dev, unsigned long *freq, u32 flags); @@ -228,16 +228,6 @@ static inline int devfreq_remove_device(struct devfreq *devfreq) return 0; } -static inline int devfreq_suspend_device(struct devfreq *devfreq) -{ - return 0; -} - -static inline int devfreq_resume_device(struct devfreq *devfreq) -{ - return 0; -} - static inline struct opp *devfreq_recommended_opp(struct device *dev, unsigned long *freq, u32 flags) { diff --git a/include/linux/pm.h b/include/linux/pm.h index 03d7bb1..734449c 100644 --- a/include/linux/pm.h +++ b/include/linux/pm.h @@ -40,6 +40,7 @@ extern void (*pm_power_off_prepare)(void); */ struct device; +struct devfreq; #ifdef CONFIG_PM extern const char power_group_name[]; /* = "power" */ @@ -549,6 +550,7 @@ struct dev_pm_info { #endif struct pm_subsys_data *subsys_data; /* Owned by the subsystem. */ struct dev_pm_qos *qos; + struct devfreq *devfreq; /* device devfreq */ }; extern void update_pm_runtime_accounting(struct device *dev);