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Commit 3ebc81b8 authored Mar 29, 2012 by Zhang Rui Committed by Len Brown Mar 30, 2012

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>

parent c16fa4f2

drivers/acpi/power.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -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. */

drivers/acpi/scan.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -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);