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path: root/drivers/pci/pci.c
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-rw-r--r--drivers/pci/pci.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index dbe9f39f4436..2797112c9400 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1127,6 +1127,27 @@ int pci_enable_wake(struct pci_dev *dev, pci_power_t state, int enable)
1127} 1127}
1128 1128
1129/** 1129/**
1130 * pci_wake_from_d3 - enable/disable device to wake up from D3_hot or D3_cold
1131 * @dev: PCI device to prepare
1132 * @enable: True to enable wake-up event generation; false to disable
1133 *
1134 * Many drivers want the device to wake up the system from D3_hot or D3_cold
1135 * and this function allows them to set that up cleanly - pci_enable_wake()
1136 * should not be called twice in a row to enable wake-up due to PCI PM vs ACPI
1137 * ordering constraints.
1138 *
1139 * This function only returns error code if the device is not capable of
1140 * generating PME# from both D3_hot and D3_cold, and the platform is unable to
1141 * enable wake-up power for it.
1142 */
1143int pci_wake_from_d3(struct pci_dev *dev, bool enable)
1144{
1145 return pci_pme_capable(dev, PCI_D3cold) ?
1146 pci_enable_wake(dev, PCI_D3cold, enable) :
1147 pci_enable_wake(dev, PCI_D3hot, enable);
1148}
1149
1150/**
1130 * pci_target_state - find an appropriate low power state for a given PCI dev 1151 * pci_target_state - find an appropriate low power state for a given PCI dev
1131 * @dev: PCI device 1152 * @dev: PCI device
1132 * 1153 *
@@ -1942,6 +1963,7 @@ EXPORT_SYMBOL(pci_restore_state);
1942EXPORT_SYMBOL(pci_pme_capable); 1963EXPORT_SYMBOL(pci_pme_capable);
1943EXPORT_SYMBOL(pci_pme_active); 1964EXPORT_SYMBOL(pci_pme_active);
1944EXPORT_SYMBOL(pci_enable_wake); 1965EXPORT_SYMBOL(pci_enable_wake);
1966EXPORT_SYMBOL(pci_wake_from_d3);
1945EXPORT_SYMBOL(pci_target_state); 1967EXPORT_SYMBOL(pci_target_state);
1946EXPORT_SYMBOL(pci_prepare_to_sleep); 1968EXPORT_SYMBOL(pci_prepare_to_sleep);
1947EXPORT_SYMBOL(pci_back_from_sleep); 1969EXPORT_SYMBOL(pci_back_from_sleep);