[RFC PATCH v2 1/8] ACPI: Introduce ACPI D3_COLD state support
From: Lin Ming <hidden>
Date: 2012-03-01 09:04:35
Also in:
linux-acpi, linux-scsi, lkml
Subsystem:
acpi, the rest · Maintainers:
"Rafael J. Wysocki", Linus Torvalds
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 <redacted> --- 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);
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1.7.2.5