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authorRafael J. Wysocki <rjw@sisk.pl>2012-06-16 00:02:22 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2012-07-01 13:31:29 +0200
commit0b589741b8b83a33e25fb32bb714ea1b972af5aa (patch)
tree40fb1a027166ad3da78848174ec644bf004ad20e
parentLinux 3.5-rc5 (diff)
downloadlinux-0b589741b8b83a33e25fb32bb714ea1b972af5aa.tar.xz
linux-0b589741b8b83a33e25fb32bb714ea1b972af5aa.zip
PM / Domains: Use subsystem runtime suspend/resume callbacks by default
Currently, the default "save state" and "restore state" routines for generic PM domains, pm_genpd_default_save_state() and pm_genpd_default_restore_state(), respectively, only use runtime PM callbacks provided by device drivers, but in general those callbacks need not provide the entire necessary functionality. Namely, in general it may be necessary to execute subsystem (i.e. device type, device class or bus type) callbacks that will carry out all of the necessary operations. For this reason, modify pm_genpd_default_save_state() and pm_genpd_default_restore_state() to execute subsystem callbacks, if they are provided, and fall back to driver callbacks otherwise. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
-rw-r--r--drivers/base/power/domain.c32
1 files changed, 24 insertions, 8 deletions
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 83aa694a8efe..49fdd4002b9f 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -1615,16 +1615,24 @@ EXPORT_SYMBOL_GPL(__pm_genpd_remove_callbacks);
static int pm_genpd_default_save_state(struct device *dev)
{
int (*cb)(struct device *__dev);
- struct device_driver *drv = dev->driver;
cb = dev_gpd_data(dev)->ops.save_state;
if (cb)
return cb(dev);
- if (drv && drv->pm && drv->pm->runtime_suspend)
- return drv->pm->runtime_suspend(dev);
+ if (dev->type && dev->type->pm)
+ cb = dev->type->pm->runtime_suspend;
+ else if (dev->class && dev->class->pm)
+ cb = dev->class->pm->runtime_suspend;
+ else if (dev->bus && dev->bus->pm)
+ cb = dev->bus->pm->runtime_suspend;
+ else
+ cb = NULL;
- return 0;
+ if (!cb && dev->driver && dev->driver->pm)
+ cb = dev->driver->pm->runtime_suspend;
+
+ return cb ? cb(dev) : 0;
}
/**
@@ -1634,16 +1642,24 @@ static int pm_genpd_default_save_state(struct device *dev)
static int pm_genpd_default_restore_state(struct device *dev)
{
int (*cb)(struct device *__dev);
- struct device_driver *drv = dev->driver;
cb = dev_gpd_data(dev)->ops.restore_state;
if (cb)
return cb(dev);
- if (drv && drv->pm && drv->pm->runtime_resume)
- return drv->pm->runtime_resume(dev);
+ if (dev->type && dev->type->pm)
+ cb = dev->type->pm->runtime_resume;
+ else if (dev->class && dev->class->pm)
+ cb = dev->class->pm->runtime_resume;
+ else if (dev->bus && dev->bus->pm)
+ cb = dev->bus->pm->runtime_resume;
+ else
+ cb = NULL;
- return 0;
+ if (!cb && dev->driver && dev->driver->pm)
+ cb = dev->driver->pm->runtime_resume;
+
+ return cb ? cb(dev) : 0;
}
#ifdef CONFIG_PM_SLEEP