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PM: Introduce PM_EVENT_HIBERNATE callback state

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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 <[email protected]>
Acked-by: Pavel Machek <[email protected]>
Tested-by: Jeff Chua <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Rafael J. Wysocki 2008-02-23 19:13:25 +01:00 • committed by Linus Torvalds
commit 3a2d5b7001
18 changed files with 42 additions and 24 deletions
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3
drivers/macintosh/mediabay.c
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@ -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);