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

Commit cc2893b (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 cc2893b 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 cc2893b
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>

drivers/pci/pci-driver.c

@@ -459,16 +459,17 @@ static int pci_restore_standard_config(struct pci_dev *pci_dev)
 	return 0;
 }
 
+#endif
+
+#ifdef CONFIG_PM_SLEEP
+
 static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
 {
-	pci_restore_standard_config(pci_dev);
+	pci_power_up(pci_dev);
+	pci_restore_state(pci_dev);
 	pci_fixup_device(pci_fixup_resume_early, pci_dev);
 }
 
-#endif
-
-#ifdef CONFIG_PM_SLEEP
-
 /*
  * 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);
 

drivers/pci/pci.c

@@ -672,6 +672,19 @@ void pci_update_current_state(struct pci_dev *dev, pci_power_t state)
 	}
 }
 
+/**
+ * pci_power_up - Put the given device into D0 forcibly
+ * @dev: PCI device to power up
+ */
+void pci_power_up(struct pci_dev *dev)
+{
+	if (platform_pci_power_manageable(dev))
+		platform_pci_set_power_state(dev, PCI_D0);
+
+	pci_raw_set_power_state(dev, PCI_D0);
+	pci_update_current_state(dev, PCI_D0);
+}
+
 /**
  * pci_platform_power_transition - Use platform to change device power state
  * @dev: PCI device to handle.
@@ -762,7 +775,7 @@ int __pci_complete_power_transition(struct pci_dev *dev, pci_power_t state)
 {
 	int ret;
 
-	if (state < PCI_D0)
+	if (state <= PCI_D0)
 		return -EINVAL;
 	ret = pci_platform_power_transition(dev, state);
 	/* Power off the bridge may power off the whole hierarchy */
@@ -804,6 +817,10 @@ int pci_set_power_state(struct pci_dev *dev, pci_power_t state)
 		 */
 		return 0;
 
+	/* Check if we're already there */
+	if (dev->current_state == state)
+		return 0;
+
 	__pci_start_power_transition(dev, state);
 
 	/* This device is quirked not to be put into D3, so

drivers/pci/pci.h

@@ -67,6 +67,7 @@ struct pci_platform_pm_ops {
 
 extern int pci_set_platform_pm(struct pci_platform_pm_ops *ops);
 extern void pci_update_current_state(struct pci_dev *dev, pci_power_t state);
+extern void pci_power_up(struct pci_dev *dev);
 extern void pci_disable_enabled_device(struct pci_dev *dev);
 extern int pci_finish_runtime_suspend(struct pci_dev *dev);
 extern int __pci_pme_wakeup(struct pci_dev *dev, void *ign);