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Commit 571ff758 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki Committed by Jesse Barnes
Browse files

PCI PM: Power-manage devices without drivers during suspend-resume 



PCI devices without drivers can be put into low power states during
suspend with the help of pci_prepare_to_sleep() and prevented from
generating wake-up events during resume with the help of
pci_enable_wake().  However, it's better not to put bridges into
low power states during suspend, because that might result in entire
bus segments being powered off.

Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Acked-by: default avatarPavel Machek <pavel@suse.cz>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent fa58d305

drivers/pci/pci-driver.c

+29 −4
Original line number Original line Diff line number Diff line
@@ -435,6 +435,31 @@ static int pci_legacy_resume_early(struct device *dev) 
	return error;

	return error;

}

}





/* Auxiliary functions used by the new power management framework */



static bool pci_is_bridge(struct pci_dev *pci_dev)

{

	return !!(pci_dev->subordinate);

}



static int pci_pm_default_resume(struct pci_dev *pci_dev)

{

	if (!pci_is_bridge(pci_dev))

		pci_enable_wake(pci_dev, PCI_D0, false);



	return pci_default_pm_resume_late(pci_dev);

}



static void pci_pm_default_suspend(struct pci_dev *pci_dev)

{

	pci_default_pm_suspend_early(pci_dev);



	if (!pci_is_bridge(pci_dev))

		pci_prepare_to_sleep(pci_dev);

}



/* New power management framework */



static int pci_pm_prepare(struct device *dev)

static int pci_pm_prepare(struct device *dev)

{

{

	struct device_driver *drv = dev->driver;

	struct device_driver *drv = dev->driver;
@@ -470,7 +495,7 @@ static int pci_pm_suspend(struct device *dev) 
	} else if (pci_has_legacy_pm_support(pci_dev)) {

	} else if (pci_has_legacy_pm_support(pci_dev)) {

		error = pci_legacy_suspend(dev, PMSG_SUSPEND);

		error = pci_legacy_suspend(dev, PMSG_SUSPEND);

	} else {

	} else {

		pci_default_pm_suspend_early(pci_dev);

		pci_pm_default_suspend(pci_dev);

	}

	}





	pci_fixup_device(pci_fixup_suspend, pci_dev);

	pci_fixup_device(pci_fixup_suspend, pci_dev);
@@ -512,7 +537,7 @@ static int pci_pm_resume(struct device *dev) 
	} else if (pci_has_legacy_pm_support(pci_dev)) {

	} else if (pci_has_legacy_pm_support(pci_dev)) {

		error = pci_legacy_resume(dev);

		error = pci_legacy_resume(dev);

	} else {

	} else {

		error = pci_default_pm_resume_late(pci_dev);

		error = pci_pm_default_resume(pci_dev);

	}

	}





	return error;

	return error;
@@ -642,7 +667,7 @@ static int pci_pm_poweroff(struct device *dev) 
	} else if (pci_has_legacy_pm_support(pci_dev)) {

	} else if (pci_has_legacy_pm_support(pci_dev)) {

		error = pci_legacy_suspend(dev, PMSG_HIBERNATE);

		error = pci_legacy_suspend(dev, PMSG_HIBERNATE);

	} else {

	} else {

		pci_default_pm_suspend_early(pci_dev);

		pci_pm_default_suspend(pci_dev);

	}

	}





	pci_fixup_device(pci_fixup_suspend, pci_dev);

	pci_fixup_device(pci_fixup_suspend, pci_dev);
@@ -681,7 +706,7 @@ static int pci_pm_restore(struct device *dev) 
	} else if (pci_has_legacy_pm_support(pci_dev)) {

	} else if (pci_has_legacy_pm_support(pci_dev)) {

		error = pci_legacy_resume(dev);

		error = pci_legacy_resume(dev);

	} else {

	} else {

		error = pci_default_pm_resume_late(pci_dev);

		error = pci_pm_default_resume(pci_dev);

	}

	}





	return error;

	return error;