From 3ebc81b8937d2bc1d0d0064bed29434dfce490aa Mon Sep 17 00:00:00 2001 From: Zhang Rui Date: Thu, 29 Mar 2012 14:09:38 +0800 Subject: ACPI: Introduce ACPI D3_COLD state support If a device has _PR3, it means the device supports D3_COLD. Add the ability to validate and enter D3_COLD state in ACPI. Signed-off-by: Zhang Rui Signed-off-by: Lin Ming Signed-off-by: Len Brown --- drivers/acpi/scan.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'drivers/acpi/scan.c') diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 8ab80bafe3f1..571396cf6110 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -885,6 +885,13 @@ static int acpi_bus_get_power_flags(struct acpi_device *device) acpi_bus_add_power_resource(ps->resources.handles[j]); } + /* The exist of _PR3 indicates D3Cold support */ + if (i == ACPI_STATE_D3) { + status = acpi_get_handle(device->handle, object_name, &handle); + if (ACPI_SUCCESS(status)) + device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1; + } + /* Evaluate "_PSx" to see if we can do explicit sets */ object_name[2] = 'S'; status = acpi_get_handle(device->handle, object_name, &handle); -- cgit v1.2.3