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 <rui.zhang@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 9ac2a9f..0d681fb 100644
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -500,14 +500,14 @@
{
int result;
- if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
+ if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
return -EINVAL;
if (device->power.state == state)
return 0;
if ((device->power.state < ACPI_STATE_D0)
- || (device->power.state > ACPI_STATE_D3))
+ || (device->power.state > ACPI_STATE_D3_COLD))
return -ENODEV;
/* TBD: Resources must be ordered. */
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 8ab80ba..571396c 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -885,6 +885,13 @@
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);