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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-10-07 00:50:24 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-10-14 02:17:34 +0200 |
| commit | 58a1fbbb2ee873dd1fe327e80bc7b08e80866269 (patch) | |
| tree | 3c3552e6631af82c4afb3f449ae8042bc925bf53 /include/linux/pm.h | |
| parent | ef25ba0476015908ef5960f9faac149ddf34ede0 (diff) | |
| download | lwn-58a1fbbb2ee873dd1fe327e80bc7b08e80866269.tar.gz lwn-58a1fbbb2ee873dd1fe327e80bc7b08e80866269.zip | |
PM / PCI / ACPI: Kick devices that might have been reset by firmware
There is a concern that if the platform firmware was involved in
the system resume that's being completed, some devices might have
been reset by it and if those devices had the power.direct_complete
flag set during the preceding suspend transition, they may stay
in a reset-power-on state indefinitely (until they are runtime-resumed
and then suspended again). That may not be a big deal from the
individual device's perspective, but if the system is an SoC, it may
be prevented from entering deep SoC-wide low-power states on idle
because of that.
The devices that are most likely to be affected by this issue are
PCI devices and ACPI-enumerated devices using the general ACPI PM
domain, so to prevent it from happening for those devices, force a
runtime resume for them if they have their power.direct_complete
flags set and the platform firmware was involved in the resume
transition currently in progress.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/linux/pm.h')
| -rw-r--r-- | include/linux/pm.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/pm.h b/include/linux/pm.h index 35d599e7250d..528be6787796 100644 --- a/include/linux/pm.h +++ b/include/linux/pm.h @@ -732,6 +732,7 @@ extern int pm_generic_poweroff_noirq(struct device *dev); extern int pm_generic_poweroff_late(struct device *dev); extern int pm_generic_poweroff(struct device *dev); extern void pm_generic_complete(struct device *dev); +extern void pm_complete_with_resume_check(struct device *dev); #else /* !CONFIG_PM_SLEEP */ |