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    Subject[RFC PATCH v2 1/8] ACPI: Introduce ACPI D3_COLD state support
    Date
    From: Zhang Rui <rui.zhang@intel.com>

    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>
    ---
    drivers/acpi/power.c | 4 ++--
    drivers/acpi/scan.c | 7 +++++++
    2 files changed, 9 insertions(+), 2 deletions(-)

    diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
    index 9ac2a9f..0d681fb 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 8ab80ba..571396c 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);
    --
    1.7.2.5


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