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Commit bed2b42d authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
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PM / Runtime: Allow helpers to be called by early platform drivers 



Runtime PM helper functions, like pm_runtime_get_sync(), cannot be
called by early platform device drivers, because the devices' power
management locks are not initialized at that time.  This is quite
inconvenient, so modify early_platform_add_devices() to initialize
the devices power management locks as appropriate and make sure that
they won't be initialized more than once if an early platform
device is going to be used as a regular one later.

Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
parent e91c11b1

drivers/base/platform.c

+2 −0
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ 
#include <linux/pm_runtime.h>



#include "base.h"

#include "power/power.h"



#define to_platform_driver(drv)	(container_of((drv), struct platform_driver, \

				 driver))
@@ -948,6 +949,7 @@ void __init early_platform_add_devices(struct platform_device **devs, int num) 
		dev = &devs[i]->dev;



		if (!dev->devres_head.next) {

			pm_runtime_early_init(dev);

			INIT_LIST_HEAD(&dev->devres_head);

			list_add_tail(&dev->devres_head,

				      &early_platform_device_list);

drivers/base/power/power.h

+16 −2
Original line number Diff line number Diff line
@@ -2,17 +2,31 @@ 


static inline void device_pm_init_common(struct device *dev)

{

	if (!dev->power.early_init) {

		spin_lock_init(&dev->power.lock);

		dev->power.power_state = PMSG_INVALID;

		dev->power.early_init = true;

	}

}



#ifdef CONFIG_PM_RUNTIME



static inline void pm_runtime_early_init(struct device *dev)

{

	dev->power.disable_depth = 1;

	device_pm_init_common(dev);

}



extern void pm_runtime_init(struct device *dev);

extern void pm_runtime_remove(struct device *dev);



#else /* !CONFIG_PM_RUNTIME */



static inline void pm_runtime_early_init(struct device *dev)

{

	device_pm_init_common(dev);

}



static inline void pm_runtime_init(struct device *dev) {}

static inline void pm_runtime_remove(struct device *dev) {}

include/linux/pm.h

+1 −0
Original line number Diff line number Diff line
@@ -510,6 +510,7 @@ struct dev_pm_info { 
	bool			is_prepared:1;	/* Owned by the PM core */

	bool			is_suspended:1;	/* Ditto */

	bool			ignore_children:1;

	bool			early_init:1;	/* Owned by the PM core */

	spinlock_t		lock;

#ifdef CONFIG_PM_SLEEP

	struct list_head	entry;