diff options
| author | Lin Ming <ming.m.lin@intel.com> | 2012-04-23 09:03:49 +0800 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2012-05-05 01:19:52 -0400 |
| commit | 1cc0c998fdf2cb665d625fb565a0d6db5c81c639 (patch) | |
| tree | 2768315b4d2217ea16082947bf995edfc40d5faf /drivers/acpi/power.c | |
| parent | ec612fcf43e09f5e05d37baf4d3f138b3fcc2f3d (diff) | |
ACPI: Fix D3hot v D3cold confusion
Before this patch, ACPI_STATE_D3 incorrectly referenced D3hot
in some places, but D3cold in other places.
After this patch, ACPI_STATE_D3 always means ACPI_STATE_D3_COLD;
and all references to D3hot use ACPI_STATE_D3_HOT.
ACPI's _PR3 method is used to enter both D3hot and D3cold states.
What distinguishes D3hot from D3cold is the presence _PR3
(Power Resources for D3hot) If these resources are all ON,
then the state is D3hot. If _PR3 is not present,
or all _PR0 resources for the devices are OFF,
then the state is D3cold.
This patch applies after Linux-3.4-rc1.
A future syntax cleanup may remove ACPI_STATE_D3
to emphasize that it always means ACPI_STATE_D3_COLD.
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Reviewed-by: Aaron Lu <aaron.lu@amd.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/power.c')
| -rw-r--r-- | drivers/acpi/power.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c index 7049a7d27c4..330bb4d7585 100644 --- a/drivers/acpi/power.c +++ b/drivers/acpi/power.c @@ -631,7 +631,7 @@ int acpi_power_get_inferred_state(struct acpi_device *device, int *state) * We know a device's inferred power state when all the resources * required for a given D-state are 'on'. */ - for (i = ACPI_STATE_D0; i < ACPI_STATE_D3; i++) { + for (i = ACPI_STATE_D0; i < ACPI_STATE_D3_HOT; i++) { list = &device->power.states[i].resources; if (list->count < 1) continue; |