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ACPI / PM: Support D3 COLD device in old BIOS for ZPODD

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D3cold is only regarded as valid if the "_PR3" object is
present for the given device after the commit 20dacb71ad
("ACPI/PM: Rework device power management to follow ACPI 6").

But some old BIOS only defined "_PS3" for the D3COLD device,
such as ZPODD device. And old kernel also believes the device with
"_PS3" is a D3COLD device.

So, add some logics for supporting D3 COLD device with old BIOS
which is compatible with earlier ACPI spec and kernel behavior.

Link: http://marc.info/?l=linux-acpi&m=144946938709759&w=2
Signed-off-by: Ken Xue <Ken.Xue@amd.com>
Reported-and-tested-by: Gang Long <Gang.Long@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Ken Xue 2015-12-09 16:17:30 +08:00 committed by Rafael J. Wysocki
parent 527e9316f8
commit cd7f84c028
1 changed files with 3 additions and 1 deletions
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4
include/acpi/acpi_bus.h
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@ -631,7 +631,9 @@ static inline bool acpi_device_can_wakeup(struct acpi_device *adev)
static inline bool acpi_device_can_poweroff(struct acpi_device *adev)
{
return adev->power.states[ACPI_STATE_D3_COLD].flags.valid;
return adev->power.states[ACPI_STATE_D3_COLD].flags.valid ||
((acpi_gbl_FADT.header.revision < 6) &&
adev->power.states[ACPI_STATE_D3_HOT].flags.explicit_set);
}
#else /* CONFIG_ACPI */