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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: Rafael J. Wysocki <rjw@sisk.pl>
hifive-unleashed-5.1
Rafael J. Wysocki 2012-08-06 01:45:11 +02:00
parent e91c11b1a7
commit bed2b42d9f
3 changed files with 19 additions and 2 deletions
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2
drivers/base/platform.c
View File

@ -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);

18
drivers/base/power/power.h
View File

@ -2,17 +2,31 @@
static inline void device_pm_init_common(struct device *dev)
{
spin_lock_init(&dev->power.lock);
dev->power.power_state = PMSG_INVALID;
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) {}

1
include/linux/pm.h
View File

@ -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;