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-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 460d046ab6fe..81f06e8dcc04 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -523,6 +523,11 @@ 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
@@ -2001,6 +2006,27 @@ 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;