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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-06-26 00:20:23 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-06-26 23:51:56 +0200 |
| commit | 471a739a47aa7d582f0cdf9d392957d04632bae2 (patch) | |
| tree | 2ab59a00c854751954f5d669fda6225a80e70732 /kernel/power | |
| parent | Linux 5.2-rc6 (diff) | |
| download | linux-471a739a47aa7d582f0cdf9d392957d04632bae2.tar.xz linux-471a739a47aa7d582f0cdf9d392957d04632bae2.zip | |
PCI: PM: Avoid skipping bus-level PM on platforms without ACPI
There are platforms that do not call pm_set_suspend_via_firmware(),
so pm_suspend_via_firmware() returns 'false' on them, but the power
states of PCI devices (PCIe ports in particular) are changed as a
result of powering down core platform components during system-wide
suspend. Thus the pm_suspend_via_firmware() checks in
pci_pm_suspend_noirq() and pci_pm_resume_noirq() introduced by
commit 3e26c5feed2a ("PCI: PM: Skip devices in D0 for suspend-to-
idle") are not sufficient to determine that devices left in D0
during suspend will remain in D0 during resume and so the bus-level
power management can be skipped for them.
For this reason, introduce a new global suspend flag,
PM_SUSPEND_FLAG_NO_PLATFORM, set it for suspend-to-idle only
and replace the pm_suspend_via_firmware() checks mentioned above
with checks against this flag.
Fixes: 3e26c5feed2a ("PCI: PM: Skip devices in D0 for suspend-to-idle")
Reported-by: Jon Hunter <jonathanh@nvidia.com>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'kernel/power')
| -rw-r--r-- | kernel/power/suspend.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c index 9505101ed2bc..096211299c07 100644 --- a/kernel/power/suspend.c +++ b/kernel/power/suspend.c @@ -493,6 +493,9 @@ int suspend_devices_and_enter(suspend_state_t state) pm_suspend_target_state = state; + if (state == PM_SUSPEND_TO_IDLE) + pm_set_suspend_no_platform(); + error = platform_suspend_begin(state); if (error) goto Close; |