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 20dacb71ad28
("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>

diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index ad0a5ff3d4cd724128b36074d428f475155df1b4..9894b752cbb1d7e7fd7e5a4acd62b2baac154148 100644 (file)
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -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 */