PCI PM: Introduce function pci_wake_from_d3

[linux-2.6-omap-h63xx.git] / drivers / pci / pci.c

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index dbe9f39f44363b3eb50d9cc7bcac0a50bd701315..2797112c94007af9f55e858329dd824979f60ad1 100644 (file)
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1126,6 +1126,27 @@ int pci_enable_wake(struct pci_dev *dev, pci_power_t state, int enable)
        return pme_done ? 0 : error;
 }
 
+/**
+ * pci_wake_from_d3 - enable/disable device to wake up from D3_hot or D3_cold
+ * @dev: PCI device to prepare
+ * @enable: True to enable wake-up event generation; false to disable
+ *
+ * Many drivers want the device to wake up the system from D3_hot or D3_cold
+ * and this function allows them to set that up cleanly - pci_enable_wake()
+ * should not be called twice in a row to enable wake-up due to PCI PM vs ACPI
+ * ordering constraints.
+ *
+ * This function only returns error code if the device is not capable of
+ * generating PME# from both D3_hot and D3_cold, and the platform is unable to
+ * enable wake-up power for it.
+ */
+int pci_wake_from_d3(struct pci_dev *dev, bool enable)
+{
+       return pci_pme_capable(dev, PCI_D3cold) ?
+                       pci_enable_wake(dev, PCI_D3cold, enable) :
+                       pci_enable_wake(dev, PCI_D3hot, enable);
+}
+
 /**
  * pci_target_state - find an appropriate low power state for a given PCI dev
  * @dev: PCI device
@@ -1942,6 +1963,7 @@ EXPORT_SYMBOL(pci_restore_state);
 EXPORT_SYMBOL(pci_pme_capable);
 EXPORT_SYMBOL(pci_pme_active);
 EXPORT_SYMBOL(pci_enable_wake);
+EXPORT_SYMBOL(pci_wake_from_d3);
 EXPORT_SYMBOL(pci_target_state);
 EXPORT_SYMBOL(pci_prepare_to_sleep);
 EXPORT_SYMBOL(pci_back_from_sleep);