Commit 3ebc81b8 authored by Zhang Rui's avatar Zhang Rui Committed by Len Brown

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: default avatarZhang Rui <rui.zhang@intel.com>
Signed-off-by: default avatarLin Ming <ming.m.lin@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent c16fa4f2
...@@ -500,14 +500,14 @@ int acpi_power_transition(struct acpi_device *device, int state) ...@@ -500,14 +500,14 @@ int acpi_power_transition(struct acpi_device *device, int state)
{ {
int result; 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; return -EINVAL;
if (device->power.state == state) if (device->power.state == state)
return 0; return 0;
if ((device->power.state < ACPI_STATE_D0) if ((device->power.state < ACPI_STATE_D0)
|| (device->power.state > ACPI_STATE_D3)) || (device->power.state > ACPI_STATE_D3_COLD))
return -ENODEV; return -ENODEV;
/* TBD: Resources must be ordered. */ /* TBD: Resources must be ordered. */
......
...@@ -885,6 +885,13 @@ static int acpi_bus_get_power_flags(struct acpi_device *device) ...@@ -885,6 +885,13 @@ static int acpi_bus_get_power_flags(struct acpi_device *device)
acpi_bus_add_power_resource(ps->resources.handles[j]); 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 */ /* Evaluate "_PSx" to see if we can do explicit sets */
object_name[2] = 'S'; object_name[2] = 'S';
status = acpi_get_handle(device->handle, object_name, &handle); status = acpi_get_handle(device->handle, object_name, &handle);
......
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