Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752203Ab1DRT7W (ORCPT ); Mon, 18 Apr 2011 15:59:22 -0400 Received: from ogre.sisk.pl ([217.79.144.158]:32894 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751068Ab1DRT7V (ORCPT ); Mon, 18 Apr 2011 15:59:21 -0400 From: "Rafael J. Wysocki" To: Linux PM mailing list Subject: Re: [Update][PATCH 7/9] PM / Runtime: Add generic clock manipulation rountines for runtime PM Date: Mon, 18 Apr 2011 21:59:54 +0200 User-Agent: KMail/1.13.6 (Linux/2.6.39-rc3+; KDE/4.6.0; x86_64; ; ) Cc: Kevin Hilman , LKML , Grant Likely , Len Brown , linux-sh@vger.kernel.org, lethal@linux-sh.org, Magnus Damm , Alan Stern , Greg KH References: <201104130205.26988.rjw@sisk.pl> <201104170135.19388.rjw@sisk.pl> <201104170142.10723.rjw@sisk.pl> In-Reply-To: <201104170142.10723.rjw@sisk.pl> MIME-Version: 1.0 Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <201104182159.54316.rjw@sisk.pl> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 11485 Lines: 447 From: Rafael J. Wysocki Many different platforms and subsystems may want to disable device clocks during suspend and enable them during resume which is going to be done in a very similar way in all those cases. For this reason, provide generic routines for the manipulation of device clocks during suspend and resume. Convert the ARM shmobile platform to using the new routines. Signed-off-by: Rafael J. Wysocki --- Hi, The previous version of the patch had a build problem for CONFIG_HAVE_CLK unset and a the name of pm_runtime_clock_add_notifier() misspelled (a couple of times). Thanks, Rafael --- arch/arm/mach-shmobile/pm_runtime.c | 139 +-------------------------- drivers/base/power/Makefile | 1 drivers/base/power/clock_ops.c | 179 ++++++++++++++++++++++++++++++++++++ include/linux/pm_runtime.h | 27 +++++ kernel/power/Kconfig | 4 5 files changed, 216 insertions(+), 134 deletions(-) Index: linux-2.6/drivers/base/power/clock_ops.c =================================================================== --- /dev/null +++ linux-2.6/drivers/base/power/clock_ops.c @@ -0,0 +1,179 @@ +/* + * drivers/base/power/clock_ops.c - Generic clock manipulation PM callbacks + * + * Copyright (c) 2011 Rafael J. Wysocki , Jinzai Solution Inc. + * + * This file is released under the GPLv2. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#ifdef CONFIG_PM_RUNTIME + +struct pm_runtime_data { + struct clk *clk; + unsigned int clock_active:1; + unsigned int clock_enabled:1; +}; + +static struct pm_runtime_data *__to_prd(struct device *dev) +{ + return dev ? dev->power.subsys_data : NULL; +} + +int pm_runtime_clock_add(struct device *dev) +{ + struct pm_runtime_data *prd; + + prd = kzalloc(sizeof(*prd), GFP_KERNEL); + if (!prd) { + dev_err(dev, "unable to allocate memory for runtime PM\n"); + return -ENOMEM; + } + + dev->power.subsys_data = prd; + return 0; +} + +void pm_runtime_clock_remove(struct device *dev) +{ + struct pm_runtime_data *prd = __to_prd(dev); + + if (!prd) + return; + + if (prd->clk) { + if (prd->clock_enabled) + clk_disable(prd->clk); + + if (prd->clock_active) + clk_put(prd->clk); + } + + kfree(prd); +} + +static void pm_runtime_clock_init(struct device *dev, + struct pm_runtime_data *prd) +{ + prd->clk = clk_get(dev, NULL); + if (!IS_ERR(prd->clk)) { + prd->clock_active = true; + dev_info(dev, "clock managed by runtime PM\n"); + } +} + +int pm_runtime_clock_suspend(struct device *dev) +{ + struct pm_runtime_data *prd = __to_prd(dev); + + dev_dbg(dev, "%s()\n", __func__); + + if (prd) { + if (!prd->clk) { + dev_err(dev, "clock is not ready for runtime PM\n"); + pm_runtime_clock_init(dev, prd); + } + + if (prd->clock_active) { + clk_disable(prd->clk); + prd->clock_enabled = false; + } + } + + return 0; +} + +int pm_runtime_clock_resume(struct device *dev) +{ + struct pm_runtime_data *prd = __to_prd(dev); + + dev_dbg(dev, "%s()\n", __func__); + + if (prd) { + if (!prd->clk) + pm_runtime_clock_init(dev, prd); + + if (prd->clock_active) { + clk_enable(prd->clk); + prd->clock_enabled = true; + } + } + + return 0; +} + +static int pm_runtime_clock_notify(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct pm_domain_notifier_block *pdnb; + struct device *dev = data; + + dev_dbg(dev, "%s() %ld\n", __func__, action); + + pdnb = container_of(nb, struct pm_domain_notifier_block, nb); + + switch (action) { + case BUS_NOTIFY_BIND_DRIVER: + dev->pwr_domain = pdnb->pwr_domain; + pm_runtime_clock_add(dev); + break; + case BUS_NOTIFY_UNBOUND_DRIVER: + dev->pwr_domain = NULL; + pm_runtime_clock_remove(dev); + break; + } + + return 0; +} + +#else /* !CONFIG_PM_RUNTIME */ + +static int pm_runtime_clock_notify(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct device *dev = data; + struct clk *clk; + + dev_dbg(dev, "%s() %ld\n", __func__, action); + + switch (action) { + case BUS_NOTIFY_BIND_DRIVER: + clk = clk_get(dev, NULL); + if (!IS_ERR(clk)) { + clk_enable(clk); + clk_put(clk); + dev_info(dev, "runtime PM disabled, clock forced on\n"); + } + break; + case BUS_NOTIFY_UNBOUND_DRIVER: + clk = clk_get(dev, NULL); + if (!IS_ERR(clk)) { + clk_disable(clk); + clk_put(clk); + dev_info(dev, "runtime PM disabled, clock forced off\n"); + } + break; + } + + return 0; +} + +#endif /* !CONFIG_PM_RUNTIME */ + +void pm_runtime_clock_add_notifier(struct bus_type *bus, + struct pm_domain_notifier_block *pdnb) +{ + if (!bus || !pdnb) + return; + + pdnb->nb.notifier_call = pm_runtime_clock_notify; + bus_register_notifier(bus, &pdnb->nb); +} Index: linux-2.6/kernel/power/Kconfig =================================================================== --- linux-2.6.orig/kernel/power/Kconfig +++ linux-2.6/kernel/power/Kconfig @@ -229,3 +229,7 @@ config PM_OPP representing individual voltage domains and provides SOC implementations a ready to use framework to manage OPPs. For more information, read + +config PM_RUNTIME_CLK + def_bool y + depends on PM_RUNTIME && HAVE_CLK Index: linux-2.6/drivers/base/power/Makefile =================================================================== --- linux-2.6.orig/drivers/base/power/Makefile +++ linux-2.6/drivers/base/power/Makefile @@ -3,6 +3,7 @@ obj-$(CONFIG_PM_SLEEP) += main.o wakeup. obj-$(CONFIG_PM_RUNTIME) += runtime.o obj-$(CONFIG_PM_TRACE_RTC) += trace.o obj-$(CONFIG_PM_OPP) += opp.o +obj-$(CONFIG_HAVE_CLK) += clock_ops.o ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG ccflags-$(CONFIG_PM_VERBOSE) += -DDEBUG Index: linux-2.6/include/linux/pm_runtime.h =================================================================== --- linux-2.6.orig/include/linux/pm_runtime.h +++ linux-2.6/include/linux/pm_runtime.h @@ -245,4 +245,31 @@ static inline void pm_runtime_dont_use_a __pm_runtime_use_autosuspend(dev, false); } +struct pm_domain_notifier_block { + struct notifier_block nb; + struct dev_power_domain *pwr_domain; +}; + +#ifdef CONFIG_PM_RUNTIME_CLK +extern int pm_runtime_clock_add(struct device *dev); +extern void pm_runtime_clock_remove(struct device *dev); +extern int pm_runtime_clock_suspend(struct device *dev); +extern int pm_runtime_clock_resume(struct device *dev); +#else +static inline int pm_runtime_clock_add(struct device *dev) { return -EINVAL; } +static inline void pm_runtime_clock_remove(struct device *dev) {} +#define pm_runtime_clock_suspend NULL +#define pm_runtime_clock_resume NULL +#endif + +#ifdef CONFIG_HAVE_CLK +extern void pm_runtime_clock_add_notifier(struct bus_type *bus, + struct pm_domain_notifier_block *pdnb); +#else +static inline void pm_runtime_clock_add_notifier(struct bus_type *bus, + struct pm_domain_notifier_block *pdnb) +{ +} +#endif + #endif Index: linux-2.6/arch/arm/mach-shmobile/pm_runtime.c =================================================================== --- linux-2.6.orig/arch/arm/mach-shmobile/pm_runtime.c +++ linux-2.6/arch/arm/mach-shmobile/pm_runtime.c @@ -21,70 +21,6 @@ #include #ifdef CONFIG_PM_RUNTIME -#define BIT_ONCE 0 -#define BIT_ACTIVE 1 -#define BIT_CLK_ENABLED 2 - -struct pm_runtime_data { - unsigned long flags; - struct clk *clk; -}; - -static struct pm_runtime_data *__to_prd(struct device *dev) -{ - return dev ? dev->power.subsys_data : NULL; -} - -static void platform_pm_runtime_init(struct device *dev, - struct pm_runtime_data *prd) -{ - if (prd && !test_and_set_bit(BIT_ONCE, &prd->flags)) { - prd->clk = clk_get(dev, NULL); - if (!IS_ERR(prd->clk)) { - set_bit(BIT_ACTIVE, &prd->flags); - dev_info(dev, "clocks managed by runtime pm\n"); - } - } -} - -static void platform_pm_runtime_bug(struct device *dev, - struct pm_runtime_data *prd) -{ - if (prd && !test_and_set_bit(BIT_ONCE, &prd->flags)) - dev_err(dev, "runtime pm suspend before resume\n"); -} - -static int default_platform_runtime_suspend(struct device *dev) -{ - struct pm_runtime_data *prd = __to_prd(dev); - - dev_dbg(dev, "%s()\n", __func__); - - platform_pm_runtime_bug(dev, prd); - - if (prd && test_bit(BIT_ACTIVE, &prd->flags)) { - clk_disable(prd->clk); - clear_bit(BIT_CLK_ENABLED, &prd->flags); - } - - return 0; -} - -static int default_platform_runtime_resume(struct device *dev) -{ - struct pm_runtime_data *prd = __to_prd(dev); - - dev_dbg(dev, "%s()\n", __func__); - - platform_pm_runtime_init(dev, prd); - - if (prd && test_bit(BIT_ACTIVE, &prd->flags)) { - clk_enable(prd->clk); - set_bit(BIT_CLK_ENABLED, &prd->flags); - } - - return 0; -} static int default_platform_runtime_idle(struct device *dev) { @@ -95,86 +31,21 @@ static int default_platform_runtime_idle static struct dev_power_domain default_power_domain = { .ops = { USE_PLATFORM_PM_SLEEP_OPS, - .runtime_suspend = default_platform_runtime_suspend, - .runtime_resume = default_platform_runtime_resume, + .runtime_suspend = pm_runtime_clock_suspend, + .runtime_resume = pm_runtime_clock_resume, .runtime_idle = default_platform_runtime_idle, }, }; -static int platform_bus_notify(struct notifier_block *nb, - unsigned long action, void *data) -{ - struct device *dev = data; - struct pm_runtime_data *prd; - - dev_dbg(dev, "platform_bus_notify() %ld !\n", action); - - switch (action) { - case BUS_NOTIFY_BIND_DRIVER: - prd = kzalloc(sizeof(*prd), GFP_KERNEL); - if (prd) { - dev->power.subsys_data = prd; - dev->pwr_domain = &default_power_domain; - } else { - dev_err(dev, "unable to alloc memory for runtime pm\n"); - } - break; - case BUS_NOTIFY_UNBOUND_DRIVER: - prd = __to_prd(dev); - if (prd) { - if (test_bit(BIT_CLK_ENABLED, &prd->flags)) - clk_disable(prd->clk); - - if (test_bit(BIT_ACTIVE, &prd->flags)) - clk_put(prd->clk); - } - break; - } - - return 0; -} - -#else /* CONFIG_PM_RUNTIME */ - -static int platform_bus_notify(struct notifier_block *nb, - unsigned long action, void *data) -{ - struct device *dev = data; - struct clk *clk; - - dev_dbg(dev, "platform_bus_notify() %ld !\n", action); - - switch (action) { - case BUS_NOTIFY_BIND_DRIVER: - clk = clk_get(dev, NULL); - if (!IS_ERR(clk)) { - clk_enable(clk); - clk_put(clk); - dev_info(dev, "runtime pm disabled, clock forced on\n"); - } - break; - case BUS_NOTIFY_UNBOUND_DRIVER: - clk = clk_get(dev, NULL); - if (!IS_ERR(clk)) { - clk_disable(clk); - clk_put(clk); - dev_info(dev, "runtime pm disabled, clock forced off\n"); - } - break; - } - - return 0; -} - #endif /* CONFIG_PM_RUNTIME */ -static struct notifier_block platform_bus_notifier = { - .notifier_call = platform_bus_notify +static struct pm_domain_notifier_block platform_bus_notifier = { + .pwr_domain = &default_power_domain, }; static int __init sh_pm_runtime_init(void) { - bus_register_notifier(&platform_bus_type, &platform_bus_notifier); + pm_runtime_clock_add_notifier(&platform_bus_type, &platform_bus_notifier); return 0; } core_initcall(sh_pm_runtime_init); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/