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authorZhang Rui <rui.zhang@intel.com>2012-03-29 14:09:38 +0800
committerLen Brown <len.brown@intel.com>2012-03-30 01:47:00 -0400
commit3ebc81b8937d2bc1d0d0064bed29434dfce490aa (patch)
treed468d5668d49d50bb36ce99b461ba8e8f26221dd /drivers/acpi
parentc16fa4f2ad19908a47c63d8fa436a1178438c7e7 (diff)
downloadlinux-3ebc81b8937d2bc1d0d0064bed29434dfce490aa.tar.bz2
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>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/power.c4
-rw-r--r--drivers/acpi/scan.c7
2 files changed, 9 insertions, 2 deletions
diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 9ac2a9fa90ff..0d681fb7428b 100644
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -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. */
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);