From 3ebc81b8937d2bc1d0d0064bed29434dfce490aa Mon Sep 17 00:00:00 2001 From: Zhang Rui <rui.zhang@intel.com> Date: Thu, 29 Mar 2012 14:09:38 +0800 Subject: 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> --- drivers/acpi/power.c | 4 ++-- drivers/acpi/scan.c | 7 +++++++ 2 files changed, 9 insertions(+), 2 deletions(-) (limited to 'drivers') diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c index 9ac2a9fa90f..0d681fb7428 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 8ab80bafe3f..571396cf611 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); -- cgit v1.2.3-70-g09d2