PCI: Query platform firmware for device power state
Usually the most accurate way to determine a PCI device's power state is to
read its PM Control & Status Register. There are two cases however when
this is not an option: If the device doesn't have the PM capability at
all, or if it is in D3cold (in which case its config space is
inaccessible).
In both cases, we can alternatively query the platform firmware for its
opinion on the device's power state. To facilitate this, augment struct
pci_platform_pm_ops with a ->get_power callback and implement it for
acpi_pci_platform_pm (the only pci_platform_pm_ops existing so far).
It is used by a forthcoming commit to let pci_update_current_state()
recognize D3cold.
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index 9a033e8..d966d47 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -452,6 +452,27 @@
return error;
}
+static pci_power_t acpi_pci_get_power_state(struct pci_dev *dev)
+{
+ struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
+ static const pci_power_t state_conv[] = {
+ [ACPI_STATE_D0] = PCI_D0,
+ [ACPI_STATE_D1] = PCI_D1,
+ [ACPI_STATE_D2] = PCI_D2,
+ [ACPI_STATE_D3_HOT] = PCI_D3hot,
+ [ACPI_STATE_D3_COLD] = PCI_D3cold,
+ };
+ int state;
+
+ if (!adev || !acpi_device_power_manageable(adev))
+ return PCI_UNKNOWN;
+
+ if (acpi_device_get_power(adev, &state) || state == ACPI_STATE_UNKNOWN)
+ return PCI_UNKNOWN;
+
+ return state_conv[state];
+}
+
static bool acpi_pci_can_wakeup(struct pci_dev *dev)
{
struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
@@ -534,6 +555,7 @@
static const struct pci_platform_pm_ops acpi_pci_platform_pm = {
.is_manageable = acpi_pci_power_manageable,
.set_state = acpi_pci_set_power_state,
+ .get_state = acpi_pci_get_power_state,
.choose_state = acpi_pci_choose_state,
.sleep_wake = acpi_pci_sleep_wake,
.run_wake = acpi_pci_run_wake,
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 2f818c3..2e18e9a 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -552,8 +552,9 @@
int pci_set_platform_pm(const struct pci_platform_pm_ops *ops)
{
- if (!ops->is_manageable || !ops->set_state || !ops->choose_state ||
- !ops->sleep_wake || !ops->run_wake || !ops->need_resume)
+ if (!ops->is_manageable || !ops->set_state || !ops->get_state ||
+ !ops->choose_state || !ops->sleep_wake || !ops->run_wake ||
+ !ops->need_resume)
return -EINVAL;
pci_platform_pm = ops;
return 0;
@@ -570,6 +571,11 @@
return pci_platform_pm ? pci_platform_pm->set_state(dev, t) : -ENOSYS;
}
+static inline pci_power_t platform_pci_get_power_state(struct pci_dev *dev)
+{
+ return pci_platform_pm ? pci_platform_pm->get_state(dev) : PCI_UNKNOWN;
+}
+
static inline pci_power_t platform_pci_choose_state(struct pci_dev *dev)
{
return pci_platform_pm ?
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 9730c47..01d5206 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -42,6 +42,8 @@
*
* @set_state: invokes the platform firmware to set the device's power state
*
+ * @get_state: queries the platform firmware for a device's current power state
+ *
* @choose_state: returns PCI power state of given device preferred by the
* platform; to be used during system-wide transitions from a
* sleeping state to the working state and vice versa
@@ -62,6 +64,7 @@
struct pci_platform_pm_ops {
bool (*is_manageable)(struct pci_dev *dev);
int (*set_state)(struct pci_dev *dev, pci_power_t state);
+ pci_power_t (*get_state)(struct pci_dev *dev);
pci_power_t (*choose_state)(struct pci_dev *dev);
int (*sleep_wake)(struct pci_dev *dev, bool enable);
int (*run_wake)(struct pci_dev *dev, bool enable);