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PCI / PM: Avoid resuming PCI devices during system suspend
Commitf25c0ae2b4
(ACPI / PM: Avoid resuming devices in ACPI PM domain during system suspend) modified the ACPI PM domain's system suspend callbacks to allow devices attached to it to be left in the runtime-suspended state during system suspend so as to optimize the suspend process. This was based on the general mechanism introduced by commitaae4518b31
(PM / sleep: Mechanism to avoid resuming runtime-suspended devices unnecessarily). Extend that approach to PCI devices by modifying the PCI bus type's ->prepare callback to return 1 for devices that are runtime-suspended when it is being executed and that are in a suitable power state and need not be resumed going forward. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
parent
ec6f34e5b5
commit
bac2a909a0
4 changed files with 55 additions and 5 deletions
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@ -501,12 +501,29 @@ static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
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return 0;
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}
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static bool acpi_pci_need_resume(struct pci_dev *dev)
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{
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struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
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if (!adev || !acpi_device_power_manageable(adev))
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return false;
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if (device_may_wakeup(&dev->dev) != !!adev->wakeup.prepare_count)
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return true;
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if (acpi_target_system_state() == ACPI_STATE_S0)
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return false;
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return !!adev->power.flags.dsw_present;
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}
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static struct pci_platform_pm_ops acpi_pci_platform_pm = {
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.is_manageable = acpi_pci_power_manageable,
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.set_state = acpi_pci_set_power_state,
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.choose_state = acpi_pci_choose_state,
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.sleep_wake = acpi_pci_sleep_wake,
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.run_wake = acpi_pci_run_wake,
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.need_resume = acpi_pci_need_resume,
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};
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void acpi_pci_add_bus(struct pci_bus *bus)
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@ -653,7 +653,6 @@ static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
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static int pci_pm_prepare(struct device *dev)
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{
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struct device_driver *drv = dev->driver;
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int error = 0;
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/*
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* Devices having power.ignore_children set may still be necessary for
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@ -662,10 +661,12 @@ static int pci_pm_prepare(struct device *dev)
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if (dev->power.ignore_children)
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pm_runtime_resume(dev);
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if (drv && drv->pm && drv->pm->prepare)
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error = drv->pm->prepare(dev);
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return error;
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if (drv && drv->pm && drv->pm->prepare) {
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int error = drv->pm->prepare(dev);
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if (error)
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return error;
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}
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return pci_dev_keep_suspended(to_pci_dev(dev));
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}
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@ -521,6 +521,11 @@ static inline int platform_pci_run_wake(struct pci_dev *dev, bool enable)
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pci_platform_pm->run_wake(dev, enable) : -ENODEV;
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}
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static inline bool platform_pci_need_resume(struct pci_dev *dev)
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{
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return pci_platform_pm ? pci_platform_pm->need_resume(dev) : false;
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}
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/**
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* pci_raw_set_power_state - Use PCI PM registers to set the power state of
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* given PCI device
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@ -1999,6 +2004,27 @@ bool pci_dev_run_wake(struct pci_dev *dev)
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}
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EXPORT_SYMBOL_GPL(pci_dev_run_wake);
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/**
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* pci_dev_keep_suspended - Check if the device can stay in the suspended state.
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* @pci_dev: Device to check.
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*
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* Return 'true' if the device is runtime-suspended, it doesn't have to be
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* reconfigured due to wakeup settings difference between system and runtime
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* suspend and the current power state of it is suitable for the upcoming
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* (system) transition.
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*/
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bool pci_dev_keep_suspended(struct pci_dev *pci_dev)
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{
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struct device *dev = &pci_dev->dev;
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if (!pm_runtime_suspended(dev)
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|| (device_can_wakeup(dev) && !device_may_wakeup(dev))
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|| platform_pci_need_resume(pci_dev))
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return false;
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return pci_target_state(pci_dev) == pci_dev->current_state;
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}
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void pci_config_pm_runtime_get(struct pci_dev *pdev)
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{
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struct device *dev = &pdev->dev;
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@ -50,6 +50,10 @@ int pci_probe_reset_function(struct pci_dev *dev);
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* for given device (the device's wake-up capability has to be
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* enabled by @sleep_wake for this feature to work)
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*
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* @need_resume: returns 'true' if the given device (which is currently
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* suspended) needs to be resumed to be configured for system
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* wakeup.
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*
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* If given platform is generally capable of power managing PCI devices, all of
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* these callbacks are mandatory.
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*/
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@ -59,6 +63,7 @@ struct pci_platform_pm_ops {
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pci_power_t (*choose_state)(struct pci_dev *dev);
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int (*sleep_wake)(struct pci_dev *dev, bool enable);
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int (*run_wake)(struct pci_dev *dev, bool enable);
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bool (*need_resume)(struct pci_dev *dev);
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};
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int pci_set_platform_pm(struct pci_platform_pm_ops *ops);
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@ -67,6 +72,7 @@ void pci_power_up(struct pci_dev *dev);
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void pci_disable_enabled_device(struct pci_dev *dev);
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int pci_finish_runtime_suspend(struct pci_dev *dev);
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int __pci_pme_wakeup(struct pci_dev *dev, void *ign);
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bool pci_dev_keep_suspended(struct pci_dev *dev);
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void pci_config_pm_runtime_get(struct pci_dev *dev);
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void pci_config_pm_runtime_put(struct pci_dev *dev);
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void pci_pm_init(struct pci_dev *dev);
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