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| author | Rafael J. Wysocki <rjw@sisk.pl> | 2012-05-20 13:58:00 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2012-05-29 21:20:24 +0200 |
| commit | 38c92fff988d518fe80dc23d0d44d66bd7e47ddd (patch) | |
| tree | c18cc469f47bf0e79f3617c59175978e60f31878 /drivers/acpi/power.c | |
| parent | 63a1a765dffb1e59d82c7948638e56d5f4f2e3a1 (diff) | |
| download | linux-38c92fff988d518fe80dc23d0d44d66bd7e47ddd.tar.bz2 | |
ACPI / PM: Make __acpi_bus_get_power() cover D3cold correctly
After recent changes of the ACPI device power states definitions, if
power resources are not used for the device's power management, the
state returned by __acpi_bus_get_power() cannot exceed D3hot, because
the return values of _PSC are 0 through 3. However, if the _PR3
method is not present for the device and _PS3 returns 3, we have to
assume that the device is in D3cold, so the value returned by
__acpi_bus_get_power() in that case should be 4.
Similarly, acpi_power_get_inferred_state() should take the power
resources for the D3hot state into account in general, so that it
can return 3 if those resources are "on" or 4 (D3cold) otherwise.
Fix the the above two issues and make sure that if both _PSC and
_PR3 are present for the device, the power resources listed by _PR3
will be used to determine if the number 3 returned by _PSC is meant
to represent D3cold or D3hot.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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 0500f719f63e..dd6d6a3c6780 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_HOT; i++) { + for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { list = &device->power.states[i].resources; if (list->count < 1) continue; |