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. Reference: http://marc.info/?l=linux-acpi&m=144946938709759&w=2 Signed-off-by: Ken Xue <ken....@amd.com> Reported-and-tested-by: Gang Long <gang.l...@amd.com> --- include/acpi/acpi_bus.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index ad0a5ff..9894b75 100644 --- 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 */ -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
