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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 /drivers/acpi/acpi_lpss.c | |
| parent | PM / sleep: Add flags to indicate platform firmware involvement (diff) | |
| download | linux-dev-58a1fbbb2ee873dd1fe327e80bc7b08e80866269.tar.xz linux-dev-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 'drivers/acpi/acpi_lpss.c')
| -rw-r--r-- | drivers/acpi/acpi_lpss.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c index f51bd0d0bc17..f9e0d09f7c66 100644 --- a/drivers/acpi/acpi_lpss.c +++ b/drivers/acpi/acpi_lpss.c @@ -664,7 +664,7 @@ static struct dev_pm_domain acpi_lpss_pm_domain = { #ifdef CONFIG_PM #ifdef CONFIG_PM_SLEEP .prepare = acpi_subsys_prepare, - .complete = acpi_subsys_complete, + .complete = pm_complete_with_resume_check, .suspend = acpi_subsys_suspend, .suspend_late = acpi_lpss_suspend_late, .resume_early = acpi_lpss_resume_early, |