PCI / PM: restore the original behavior of pci_set_power_state()
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>
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index ca2e4c7..1dd1d9d 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -459,16 +459,17 @@
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 @@
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);
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 8effb9b..acae270 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -673,6 +673,19 @@
}
/**
+ * 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.
* @state: State to put the device into.
@@ -762,7 +775,7 @@
{
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 @@
*/
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
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 5cd3dce..3318578 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -67,6 +67,7 @@
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);