[ACPI] PCI can now get suspend state from firmware
pci_choose_state() can now call
platform_pci_choose_state()
and ACPI can answer
http://bugzilla.kernel.org/show_bug.cgi?id=4277
Signed-off-by: David Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index f04b9ff..5af9418 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -304,6 +304,8 @@
return 0;
}
+int (*platform_pci_choose_state)(struct pci_dev *dev, pm_message_t state) = NULL;
+
/**
* pci_choose_state - Choose the power state of a PCI device
* @dev: PCI device to be suspended
@@ -316,10 +318,17 @@
pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state)
{
+ int ret;
+
if (!pci_find_capability(dev, PCI_CAP_ID_PM))
return PCI_D0;
- switch (state) {
+ if (platform_pci_choose_state) {
+ ret = platform_pci_choose_state(dev, state);
+ if (ret >= 0)
+ state = ret;
+ }
+ switch (state) {
case 0: return PCI_D0;
case 3: return PCI_D3hot;
default:
