[ACPI] pci_set_power_state() now calls
platform_pci_set_power_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/acpi/bus.c b/drivers/acpi/bus.c
index 4edff17..d77c230 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -212,6 +212,12 @@
ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Device is not power manageable\n"));
return_VALUE(-ENODEV);
}
+ /*
+ * Get device's current power state if it's unknown
+ * This means device power state isn't initialized or previous setting failed
+ */
+ if (device->power.state == ACPI_STATE_UNKNOWN)
+ acpi_bus_get_power(device->handle, &device->power.state);
if (state == device->power.state) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n", state));
return_VALUE(0);
@@ -231,7 +237,7 @@
* On transitions to a high-powered state we first apply power (via
* power resources) then evalute _PSx. Conversly for transitions to
* a lower-powered state.
- */
+ */
if (state < device->power.state) {
if (device->power.flags.power_resources) {
result = acpi_power_transition(device, state);
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index 8eb5997..a0d43ea 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -253,6 +253,24 @@
return -ENODEV;
}
+static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
+{
+ acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
+ static int state_conv[] = {
+ [0] = 0,
+ [1] = 1,
+ [2] = 2,
+ [3] = 3,
+ [4] = 3
+ };
+ int acpi_state = state_conv[(int __force) state];
+
+ if (!handle)
+ return -ENODEV;
+ return acpi_bus_set_power(handle, acpi_state);
+}
+
+
/* ACPI bus type */
static int pci_acpi_find_device(struct device *dev, acpi_handle *handle)
{
@@ -300,6 +318,7 @@
if (ret)
return 0;
platform_pci_choose_state = acpi_pci_choose_state;
+ platform_pci_set_power_state = acpi_pci_set_power_state;
return 0;
}
arch_initcall(pci_acpi_init);
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 5af9418..a1c66e8 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -235,7 +235,7 @@
* -EIO if device does not support PCI PM.
* 0 if we can successfully change the power state.
*/
-
+int (*platform_pci_set_power_state)(struct pci_dev *dev, pci_power_t t) = NULL;
int
pci_set_power_state(struct pci_dev *dev, pci_power_t state)
{
@@ -299,8 +299,15 @@
msleep(10);
else if (state == PCI_D2 || dev->current_state == PCI_D2)
udelay(200);
- dev->current_state = state;
+ /*
+ * Give firmware a chance to be called, such as ACPI _PRx, _PSx
+ * Firmware method after natice method ?
+ */
+ if (platform_pci_set_power_state)
+ platform_pci_set_power_state(dev, state);
+
+ dev->current_state = state;
return 0;
}
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 25c4492..d94d7af 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -13,6 +13,7 @@
void *alignf_data);
/* Firmware callbacks */
extern int (*platform_pci_choose_state)(struct pci_dev *dev, pm_message_t state);
+extern int (*platform_pci_set_power_state)(struct pci_dev *dev, pci_power_t state);
/* PCI /proc functions */
#ifdef CONFIG_PROC_FS