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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
Download patch file Download diff file Expand all files Collapse all files

2
drivers/ata/ahci.c
View file

@ -1932,7 +1932,7 @@ static int ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
void __iomem *mmio = host->iomap[AHCI_PCI_BAR];
u32 ctl;
if (mesg.event == PM_EVENT_SUSPEND) {
if (mesg.event & PM_EVENT_SLEEP) {
/* AHCI spec rev1.1 section 8.3.3:
* Software must disable interrupts prior to requesting a
* transition of the HBA to D3 state.

2
drivers/ata/ata_piix.c
View file

@ -1339,7 +1339,7 @@ static int piix_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
* cycles and power trying to do something to the sleeping
* beauty.
*/
if (piix_broken_suspend() && mesg.event == PM_EVENT_SUSPEND) {
if (piix_broken_suspend() && (mesg.event & PM_EVENT_SLEEP)) {
pci_save_state(pdev);
/* mark its power state as "unknown", since we don't

2
drivers/ata/libata-core.c
View file

@ -7368,7 +7368,7 @@ void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
pci_save_state(pdev);
pci_disable_device(pdev);
if (mesg.event == PM_EVENT_SUSPEND)
if (mesg.event & PM_EVENT_SLEEP)
pci_set_power_state(pdev, PCI_D3hot);
}