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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 <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>
This commit is contained in:
Rafael J. Wysocki 2008-02-23 19:13:25 +01:00 • committed by Linus Torvalds
parent 39273b58a4
commit 3a2d5b7001
18 changed files with 42 additions and 24 deletions
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9
include/linux/pm.h
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@ -143,6 +143,9 @@ typedef struct pm_message {
* the upcoming system state (such as PCI_D3hot), and enable
* wakeup events as appropriate.
*
* HIBERNATE Enter a low power device state appropriate for the hibernation
* state (eg. ACPI S4) and enable wakeup events as appropriate.
*
* FREEZE Quiesce operations so that a consistent image can be saved;
* but do NOT otherwise enter a low power device state, and do
* NOT emit system wakeup events.
@ -166,11 +169,15 @@ typedef struct pm_message {
#define PM_EVENT_ON 0
#define PM_EVENT_FREEZE 1
#define PM_EVENT_SUSPEND 2
#define PM_EVENT_PRETHAW 3
#define PM_EVENT_HIBERNATE 4
#define PM_EVENT_PRETHAW 8
#define PM_EVENT_SLEEP (PM_EVENT_SUSPEND | PM_EVENT_HIBERNATE)
#define PMSG_FREEZE ((struct pm_message){ .event = PM_EVENT_FREEZE, })
#define PMSG_PRETHAW ((struct pm_message){ .event = PM_EVENT_PRETHAW, })
#define PMSG_SUSPEND ((struct pm_message){ .event = PM_EVENT_SUSPEND, })
#define PMSG_HIBERNATE ((struct pm_message){ .event = PM_EVENT_HIBERNATE, })
#define PMSG_ON ((struct pm_message){ .event = PM_EVENT_ON, })
struct dev_pm_info {