PM: Introduce PM_EVENT_HIBERNATE callback state

During the last step of hibernation in the "platform" mode (with the
help of ACPI) we use the suspend code, including the devices'
->suspend() methods, to prepare the system for entering the ACPI S4
system sleep state.

But at least for some devices the operations performed by the
->suspend() callback in that case must be different from its operations
during regular suspend.

For this reason, introduce the new PM event type PM_EVENT_HIBERNATE and
pass it to the device drivers' ->suspend() methods during the last phase
of hibernation, so that they can distinguish this case and handle it as
appropriate.  Modify the drivers that handle PM_EVENT_SUSPEND in a
special way and need to handle PM_EVENT_HIBERNATE in the same way.

These changes are necessary to fix a hibernation regression related
to the i915 driver (ref. http://lkml.org/lkml/2008/2/22/488).

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Tested-by: Jeff Chua <jeff.chua.linux@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/ide/ppc/pmac.c b/drivers/ide/ppc/pmac.c
index 12ac3bfb4f9a..78c9eeb85634 100644
--- a/drivers/ide/ppc/pmac.c
+++ b/drivers/ide/ppc/pmac.c
@@ -1254,7 +1254,7 @@ pmac_ide_macio_suspend(struct macio_dev *mdev, pm_message_t mesg)
         int             rc = 0;
 
         if (mesg.event != mdev->ofdev.dev.power.power_state.event
-                        && mesg.event == PM_EVENT_SUSPEND) {
+                        && (mesg.event & PM_EVENT_SLEEP)) {
                 rc = pmac_ide_do_suspend(hwif);
                 if (rc == 0)
                         mdev->ofdev.dev.power.power_state = mesg;
@@ -1364,7 +1364,7 @@ pmac_ide_pci_suspend(struct pci_dev *pdev, pm_message_t mesg)
         int             rc = 0;
         
         if (mesg.event != pdev->dev.power.power_state.event
-                        && mesg.event == PM_EVENT_SUSPEND) {
+                        && (mesg.event & PM_EVENT_SLEEP)) {
                 rc = pmac_ide_do_suspend(hwif);
                 if (rc == 0)
                         pdev->dev.power.power_state = mesg;