aboutsummaryrefslogtreecommitdiff
path: root/drivers/pci/pci-acpi.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/pci/pci-acpi.c')
-rw-r--r--drivers/pci/pci-acpi.c28
1 files changed, 24 insertions, 4 deletions
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index c8062494009..67c63d1f158 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -245,16 +245,33 @@ EXPORT_SYMBOL(pci_osc_control_set);
* currently we simply return _SxD, if present.
*/
-static int acpi_pci_choose_state(struct pci_dev *pdev, pm_message_t state)
+static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev,
+ pm_message_t state)
{
- /* TBD */
-
- return -ENODEV;
+ int acpi_state;
+
+ acpi_state = acpi_pm_device_sleep_state(&pdev->dev,
+ device_may_wakeup(&pdev->dev), NULL);
+ if (acpi_state < 0)
+ return PCI_POWER_ERROR;
+
+ switch (acpi_state) {
+ case ACPI_STATE_D0:
+ return PCI_D0;
+ case ACPI_STATE_D1:
+ return PCI_D1;
+ case ACPI_STATE_D2:
+ return PCI_D2;
+ case ACPI_STATE_D3:
+ return PCI_D3hot;
+ }
+ return PCI_POWER_ERROR;
}
static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
{
acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
+ acpi_handle tmp;
static int state_conv[] = {
[0] = 0,
[1] = 1,
@@ -266,6 +283,9 @@ static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
if (!handle)
return -ENODEV;
+ /* If the ACPI device has _EJ0, ignore the device */
+ if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
+ return 0;
return acpi_bus_set_power(handle, acpi_state);
}