PCI / PM: Avoid resuming PCI devices during system suspend

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Commit f25c0ae2b4 (ACPI / PM: Avoid resuming devices in ACPI PM
domain during system suspend) modified the ACPI PM domain's system
suspend callbacks to allow devices attached to it to be left in the
runtime-suspended state during system suspend so as to optimize
the suspend process.

This was based on the general mechanism introduced by commit
aae4518b31 (PM / sleep: Mechanism to avoid resuming runtime-suspended
devices unnecessarily).

Extend that approach to PCI devices by modifying the PCI bus type's
->prepare callback to return 1 for devices that are runtime-suspended
when it is being executed and that are in a suitable power state and
need not be resumed going forward.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>

...

This commit is contained in:

Rafael J. Wysocki 2015-01-21 02:17:42 +01:00

parent ec6f34e5b5

commit bac2a909a0

4 changed files with 55 additions and 5 deletions

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17

drivers/pci/pci-acpi.c

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11

drivers/pci/pci-driver.c

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26

drivers/pci/pci.c

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6

drivers/pci/pci.h

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