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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: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
hifive-unleashed-5.1
Rafael J. Wysocki 2009-01-07 13:05:05 +01:00 committed by Jesse Barnes
parent fa58d305d9
commit 571ff7584b
1 changed files with 29 additions and 4 deletions
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33
drivers/pci/pci-driver.c
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@ -435,6 +435,31 @@ static int pci_legacy_resume_early(struct device *dev)
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)
{
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)) {
error = pci_legacy_suspend(dev, PMSG_SUSPEND);
} else {
pci_default_pm_suspend_early(pci_dev);
pci_pm_default_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)) {
error = pci_legacy_resume(dev);
} else {
error = pci_default_pm_resume_late(pci_dev);
error = pci_pm_default_resume(pci_dev);
}
return error;
@ -642,7 +667,7 @@ static int pci_pm_poweroff(struct device *dev)
} else if (pci_has_legacy_pm_support(pci_dev)) {
error = pci_legacy_suspend(dev, PMSG_HIBERNATE);
} else {
pci_default_pm_suspend_early(pci_dev);
pci_pm_default_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)) {
error = pci_legacy_resume(dev);
} else {
error = pci_default_pm_resume_late(pci_dev);
error = pci_pm_default_resume(pci_dev);
}
return error;