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PCI: PM: Avoid skipping bus-level PM on platforms without ACPI

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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 3e26c5feed ("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: 3e26c5feed ("PCI: PM: Skip devices in D0 for suspend-to-idle")
Reported-by: Jon Hunter <[email protected]>
Tested-by: Jon Hunter <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Tested-by: Mika Westerberg <[email protected]>
Reviewed-by: Mika Westerberg <[email protected]>
This commit is contained in:
Rafael J. Wysocki 2019-06-26 00:20:23 +02:00
commit 471a739a47
3 changed files with 31 additions and 6 deletions
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3
kernel/power/suspend.c
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@ -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;