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Merge branch 'pm-pci'

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* pm-pci:
  PCI / PM: Fix native PME handling during system suspend/resume
  PCI / PM: Restore PME Enable after config space restoration
This commit is contained in:
Rafael J. Wysocki 2017-07-14 13:15:49 +02:00
commit ec4b8ddcd3
4 changed files with 24 additions and 30 deletions
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2
drivers/pci/pci-driver.c
View File

@ -511,6 +511,7 @@ static int pci_restore_standard_config(struct pci_dev *pci_dev)
}
pci_restore_state(pci_dev);
pci_pme_restore(pci_dev);
return 0;
}
@ -522,6 +523,7 @@ static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
{
pci_power_up(pci_dev);
pci_restore_state(pci_dev);
pci_pme_restore(pci_dev);
pci_fixup_device(pci_fixup_resume_early, pci_dev);
}

16
drivers/pci/pci.c
View File

@ -1801,7 +1801,11 @@ static void __pci_pme_active(struct pci_dev *dev, bool enable)
pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr);
}
static void pci_pme_restore(struct pci_dev *dev)
/**
* pci_pme_restore - Restore PME configuration after config space restore.
* @dev: PCI device to update.
*/
void pci_pme_restore(struct pci_dev *dev)
{
u16 pmcsr;
@ -1811,6 +1815,7 @@ static void pci_pme_restore(struct pci_dev *dev)
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
if (dev->wakeup_prepared) {
pmcsr |= PCI_PM_CTRL_PME_ENABLE;
pmcsr &= ~PCI_PM_CTRL_PME_STATUS;
} else {
pmcsr &= ~PCI_PM_CTRL_PME_ENABLE;
pmcsr |= PCI_PM_CTRL_PME_STATUS;
@ -1907,14 +1912,9 @@ int pci_enable_wake(struct pci_dev *dev, pci_power_t state, bool enable)
{
int ret = 0;
/*
* Don't do the same thing twice in a row for one device, but restore
* PME Enable in case it has been updated by config space restoration.
*/
if (!!enable == !!dev->wakeup_prepared) {
pci_pme_restore(dev);
/* Don't do the same thing twice in a row for one device. */
if (!!enable == !!dev->wakeup_prepared)
return 0;
}
/*
* According to "PCI System Architecture" 4th ed. by Tom Shanley & Don

1
drivers/pci/pci.h
View File

@ -71,6 +71,7 @@ void pci_power_up(struct pci_dev *dev);
void pci_disable_enabled_device(struct pci_dev *dev);
int pci_finish_runtime_suspend(struct pci_dev *dev);
int __pci_pme_wakeup(struct pci_dev *dev, void *ign);
void pci_pme_restore(struct pci_dev *dev);
bool pci_dev_keep_suspended(struct pci_dev *dev);
void pci_dev_complete_resume(struct pci_dev *pci_dev);
void pci_config_pm_runtime_get(struct pci_dev *dev);

35
drivers/pci/pcie/pme.c
View File

@ -40,17 +40,11 @@ static int __init pcie_pme_setup(char *str)
}
__setup("pcie_pme=", pcie_pme_setup);
enum pme_suspend_level {
PME_SUSPEND_NONE = 0,
PME_SUSPEND_WAKEUP,
PME_SUSPEND_NOIRQ,
};
struct pcie_pme_service_data {
spinlock_t lock;
struct pcie_device *srv;
struct work_struct work;
enum pme_suspend_level suspend_level;
bool noirq; /* If set, keep the PME interrupt disabled. */
};
/**
@ -228,7 +222,7 @@ static void pcie_pme_work_fn(struct work_struct *work)
spin_lock_irq(&data->lock);
for (;;) {
if (data->suspend_level != PME_SUSPEND_NONE)
if (data->noirq)
break;
pcie_capability_read_dword(port, PCI_EXP_RTSTA, &rtsta);
@ -255,7 +249,7 @@ static void pcie_pme_work_fn(struct work_struct *work)
spin_lock_irq(&data->lock);
}
if (data->suspend_level == PME_SUSPEND_NONE)
if (!data->noirq)
pcie_pme_interrupt_enable(port, true);
spin_unlock_irq(&data->lock);
@ -378,7 +372,7 @@ static int pcie_pme_suspend(struct pcie_device *srv)
{
struct pcie_pme_service_data *data = get_service_data(srv);
struct pci_dev *port = srv->port;
bool wakeup, wake_irq_enabled = false;
bool wakeup;
int ret;
if (device_may_wakeup(&port->dev)) {
@ -388,19 +382,16 @@ static int pcie_pme_suspend(struct pcie_device *srv)
wakeup = pcie_pme_check_wakeup(port->subordinate);
up_read(&pci_bus_sem);
}
spin_lock_irq(&data->lock);
if (wakeup) {
ret = enable_irq_wake(srv->irq);
if (ret == 0) {
data->suspend_level = PME_SUSPEND_WAKEUP;
wake_irq_enabled = true;
}
}
if (!wake_irq_enabled) {
pcie_pme_interrupt_enable(port, false);
pcie_clear_root_pme_status(port);
data->suspend_level = PME_SUSPEND_NOIRQ;
if (!ret)
return 0;
}
spin_lock_irq(&data->lock);
pcie_pme_interrupt_enable(port, false);
pcie_clear_root_pme_status(port);
data->noirq = true;
spin_unlock_irq(&data->lock);
synchronize_irq(srv->irq);
@ -417,15 +408,15 @@ static int pcie_pme_resume(struct pcie_device *srv)
struct pcie_pme_service_data *data = get_service_data(srv);
spin_lock_irq(&data->lock);
if (data->suspend_level == PME_SUSPEND_NOIRQ) {
if (data->noirq) {
struct pci_dev *port = srv->port;
pcie_clear_root_pme_status(port);
pcie_pme_interrupt_enable(port, true);
data->noirq = false;
} else {
disable_irq_wake(srv->irq);
}
data->suspend_level = PME_SUSPEND_NONE;
spin_unlock_irq(&data->lock);
return 0;