Commit a32aaf14 authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt
Browse files

powerpc/vio: Add power management support 



Adds support for suspend/resume for VIO devices. This is needed for
support for HMC initiated hibernation.

Signed-off-by: default avatarBrian King <brking@linux.vnet.ibm.com>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 8260cf6f

arch/powerpc/kernel/vio.c

+24 −0
Original line number Diff line number Diff line
@@ -1381,6 +1381,29 @@ static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env) 
	return 0;

}



static int vio_pm_suspend(struct device *dev)

{

	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;



	if (pm && pm->suspend)

		return pm->suspend(dev);

	return 0;

}



static int vio_pm_resume(struct device *dev)

{

	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;



	if (pm && pm->resume)

		return pm->resume(dev);

	return 0;

}



const struct dev_pm_ops vio_dev_pm_ops = {

	.suspend = vio_pm_suspend,

	.resume = vio_pm_resume,

};



static struct bus_type vio_bus_type = {

	.name = "vio",

	.dev_attrs = vio_dev_attrs,
@@ -1388,6 +1411,7 @@ static struct bus_type vio_bus_type = { 
	.match = vio_bus_match,

	.probe = vio_bus_probe,

	.remove = vio_bus_remove,

	.pm = &vio_dev_pm_ops,

};



/**