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PCI / PM: restore the original behavior of pci_set_power_state()

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Commit cc2893b6 (PCI: Ensure we re-enable devices on resume)
addressed the problem with USB not being powered after resume on
recent Lenovo machines, but it did that in a suboptimal way.
Namely, it should have changed the relevant code paths only,
which are pci_pm_resume_noirq() and pci_pm_restore_noirq() supposed
to restore the device's power and standard configuration registers
after system resume from suspend or hibernation.  Instead, however,
it modified pci_set_power_state() which is executed in several
other situations too.  That resulted in some undesirable effects,
like attempting to change a device's power state in the same way
multiple times in a row (up to as many as 4 times in a row in the
snd_hda_intel driver).

Fix the bug addressed by commit cc2893b6 in an alternative way,
by forcibly powering up all devices in pci_pm_default_resume_early(),
which is called by pci_pm_resume_noirq() and pci_pm_restore_noirq()
to restore the device's power and standard configuration registers,
and modifying pci_pm_runtime_resume() to avoid the forcible power-up
if not necessary.  Then, revert the changes made by commit cc2893b6
to make the confusion introduced by it go away.

Acked-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Rafael J. Wysocki
2012-07-05 15:20:00 -06:00
committed by Bjorn Helgaas
parent 448bd857d4
commit db288c9c5f
3 changed files with 28 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/pci/pci-driver.c
+9 -7
View File
@@ -459,16 +459,17 @@ static int pci_restore_standard_config(struct pci_dev *pci_dev)
return 0;
}
static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
{
pci_restore_standard_config(pci_dev);
pci_fixup_device(pci_fixup_resume_early, pci_dev);
}
#endif
#ifdef CONFIG_PM_SLEEP
static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
{
pci_power_up(pci_dev);
pci_restore_state(pci_dev);
pci_fixup_device(pci_fixup_resume_early, pci_dev);
}
/*
* Default "suspend" method for devices that have no driver provided suspend,
* or not even a driver at all (second part).
@@ -1054,7 +1055,8 @@ static int pci_pm_runtime_resume(struct device *dev)
if (!pm || !pm->runtime_resume)
return -ENOSYS;
pci_pm_default_resume_early(pci_dev);
pci_restore_standard_config(pci_dev);
pci_fixup_device(pci_fixup_resume_early, pci_dev);
__pci_enable_wake(pci_dev, PCI_D0, true, false);
pci_fixup_device(pci_fixup_resume, pci_dev);