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, 1 deletions

diff --git a/drivers/macintosh/mediabay.c b/drivers/macintosh/mediabay.c
index 51a112815f46..bd8a1d14b45d 100644
--- a/drivers/macintosh/mediabay.c
+++ b/drivers/macintosh/mediabay.c
@@ -698,7 +698,8 @@ static int media_bay_suspend(struct macio_dev *mdev, pm_message_t state)
 {
 	struct media_bay_info	*bay = macio_get_drvdata(mdev);
 
-	if (state.event != mdev->ofdev.dev.power.power_state.event && state.event == PM_EVENT_SUSPEND) {
+	if (state.event != mdev->ofdev.dev.power.power_state.event
+	    && (state.event & PM_EVENT_SLEEP)) {
 		down(&bay->lock);
 		bay->sleeping = 1;
 		set_mb_power(bay, 0);