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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>
hifive-unleashed-5.1
Zhang Rui 2012-03-29 14:09:38 +08:00 committed by Len Brown
parent c16fa4f2ad
commit 3ebc81b893
2 changed files with 9 additions and 2 deletions
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4
drivers/acpi/power.c
View File

@ -500,14 +500,14 @@ int acpi_power_transition(struct acpi_device *device, int state)
{
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. */

7
drivers/acpi/scan.c
View File

@ -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);