Commit cd7f84c0 authored Dec 09, 2015 by Ken Xue Committed by Rafael J. Wysocki Dec 09, 2015

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

D3cold is only regarded as valid if the "_PR3" object is
present for the given device after the commit 20dacb71
("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>

parent 527e9316

include/acpi/acpi_bus.h

+3 −1

Original line number	Diff line number	Diff line
		@@ -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 */

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