diff options
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/power/Makefile | 3 | ||||
| -rw-r--r-- | drivers/base/power/runtime.c | 84 |
2 files changed, 85 insertions, 2 deletions
diff --git a/drivers/base/power/Makefile b/drivers/base/power/Makefile index 2e58ebb1f6c0..1cb8544598d5 100644 --- a/drivers/base/power/Makefile +++ b/drivers/base/power/Makefile @@ -1,6 +1,5 @@ -obj-$(CONFIG_PM) += sysfs.o generic_ops.o common.o qos.o +obj-$(CONFIG_PM) += sysfs.o generic_ops.o common.o qos.o runtime.o obj-$(CONFIG_PM_SLEEP) += main.o wakeup.o -obj-$(CONFIG_PM_RUNTIME) += runtime.o obj-$(CONFIG_PM_TRACE_RTC) += trace.o obj-$(CONFIG_PM_OPP) += opp.o obj-$(CONFIG_PM_GENERIC_DOMAINS) += domain.o domain_governor.o diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index ac495b1357fa..4776cf528d08 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -44,6 +44,7 @@ static int (*rpm_get_resume_cb(struct device *dev))(struct device *) return RPM_GET_CALLBACK(dev, runtime_resume); } +#ifdef CONFIG_PM_RUNTIME static int (*rpm_get_idle_cb(struct device *dev))(struct device *) { return RPM_GET_CALLBACK(dev, runtime_idle); @@ -1401,3 +1402,86 @@ void pm_runtime_remove(struct device *dev) if (dev->power.irq_safe && dev->parent) pm_runtime_put(dev->parent); } +#endif + +/** + * pm_runtime_force_suspend - Force a device into suspend state if needed. + * @dev: Device to suspend. + * + * Disable runtime PM so we safely can check the device's runtime PM status and + * if it is active, invoke it's .runtime_suspend callback to bring it into + * suspend state. Keep runtime PM disabled to preserve the state unless we + * encounter errors. + * + * Typically this function may be invoked from a system suspend callback to make + * sure the device is put into low power state. + */ +int pm_runtime_force_suspend(struct device *dev) +{ + int (*callback)(struct device *); + int ret = 0; + + pm_runtime_disable(dev); + + /* + * Note that pm_runtime_status_suspended() returns false while + * !CONFIG_PM_RUNTIME, which means the device will be put into low + * power state. + */ + if (pm_runtime_status_suspended(dev)) + return 0; + + callback = rpm_get_suspend_cb(dev); + + if (!callback) { + ret = -ENOSYS; + goto err; + } + + ret = callback(dev); + if (ret) + goto err; + + pm_runtime_set_suspended(dev); + return 0; +err: + pm_runtime_enable(dev); + return ret; +} +EXPORT_SYMBOL_GPL(pm_runtime_force_suspend); + +/** + * pm_runtime_force_resume - Force a device into resume state. + * @dev: Device to resume. + * + * Prior invoking this function we expect the user to have brought the device + * into low power state by a call to pm_runtime_force_suspend(). Here we reverse + * those actions and brings the device into full power. We update the runtime PM + * status and re-enables runtime PM. + * + * Typically this function may be invoked from a system resume callback to make + * sure the device is put into full power state. + */ +int pm_runtime_force_resume(struct device *dev) +{ + int (*callback)(struct device *); + int ret = 0; + + callback = rpm_get_resume_cb(dev); + + if (!callback) { + ret = -ENOSYS; + goto out; + } + + ret = callback(dev); + if (ret) + goto out; + + pm_runtime_set_active(dev); + pm_runtime_mark_last_busy(dev); +out: + pm_runtime_enable(dev); + return ret; +} +EXPORT_SYMBOL_GPL(pm_runtime_force_resume); |