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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-01-21 02:17:42 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-01-23 22:13:54 +0100
commitbac2a909a096c9110525c18cbb8ce73c660d5f71 (patch)
tree59bd2a6efea9c9cb4cca404f35ae94c67f0dd988 /drivers/pci/pci.c
parentec6f34e5b552fb0a52e6aae1a5afbbb1605cc6cc (diff)
downloadlinux-bac2a909a096c9110525c18cbb8ce73c660d5f71.tar.bz2
PCI / PM: Avoid resuming PCI devices during system suspend
Commit f25c0ae2b4c4 (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 commit aae4518b3124 (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>
Diffstat (limited to 'drivers/pci/pci.c')
-rw-r--r--drivers/pci/pci.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index cab05f31223f..7a671abceccc 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -521,6 +521,11 @@ static inline int platform_pci_run_wake(struct pci_dev *dev, bool enable)
pci_platform_pm->run_wake(dev, enable) : -ENODEV;
}
+static inline bool platform_pci_need_resume(struct pci_dev *dev)
+{
+ return pci_platform_pm ? pci_platform_pm->need_resume(dev) : false;
+}
+
/**
* pci_raw_set_power_state - Use PCI PM registers to set the power state of
* given PCI device
@@ -1999,6 +2004,27 @@ bool pci_dev_run_wake(struct pci_dev *dev)
}
EXPORT_SYMBOL_GPL(pci_dev_run_wake);
+/**
+ * pci_dev_keep_suspended - Check if the device can stay in the suspended state.
+ * @pci_dev: Device to check.
+ *
+ * Return 'true' if the device is runtime-suspended, it doesn't have to be
+ * reconfigured due to wakeup settings difference between system and runtime
+ * suspend and the current power state of it is suitable for the upcoming
+ * (system) transition.
+ */
+bool pci_dev_keep_suspended(struct pci_dev *pci_dev)
+{
+ struct device *dev = &pci_dev->dev;
+
+ if (!pm_runtime_suspended(dev)
+ || (device_can_wakeup(dev) && !device_may_wakeup(dev))
+ || platform_pci_need_resume(pci_dev))
+ return false;
+
+ return pci_target_state(pci_dev) == pci_dev->current_state;
+}
+
void pci_config_pm_runtime_get(struct pci_dev *pdev)
{
struct device *dev = &pdev->dev;