PCI PM: Fix pci_update_current_state

Currently, PCI devices without the PM capability that are power
manageable by the platform (eg. ACPI) are not handled correctly
by pci_set_power_state(), because their current_state field is not
updated to reflect the new power state of the device.  Fix this by
making pci_update_current_state() accept additional argument
representing the power state of the device as set by the platform.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 1b807330e500..9d2aa6366fd0 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -525,14 +525,17 @@ pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state)
  * pci_update_current_state - Read PCI power state of given device from its
  *                            PCI PM registers and cache it
  * @dev: PCI device to handle.
+ * @state: State to cache in case the device doesn't have the PM capability
  */
-static void pci_update_current_state(struct pci_dev *dev)
+static void pci_update_current_state(struct pci_dev *dev, pci_power_t state)
 {
         if (dev->pm_cap) {
                 u16 pmcsr;
 
                 pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
                 dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK);
+        } else {
+                dev->current_state = state;
         }
 }
 
@@ -575,7 +578,7 @@ int pci_set_power_state(struct pci_dev *dev, pci_power_t state)
                  */
                 int ret = platform_pci_set_power_state(dev, PCI_D0);
                 if (!ret)
-                        pci_update_current_state(dev);
+                        pci_update_current_state(dev, PCI_D0);
         }
         /* This device is quirked not to be put into D3, so
            don't put it in D3 */
@@ -588,7 +591,7 @@ int pci_set_power_state(struct pci_dev *dev, pci_power_t state)
                 /* Allow the platform to finalize the transition */
                 int ret = platform_pci_set_power_state(dev, state);
                 if (!ret) {
-                        pci_update_current_state(dev);
+                        pci_update_current_state(dev, state);
                         error = 0;
                 }
         }