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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-06-25 14:04:45 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-06-27 12:29:59 +0200 |
| commit | 21ba237926227121dacccaf5d7863b0cb50f3eda (patch) | |
| tree | cd9c1f2e84d37ad6b583d5c951ad95ae84fa3f25 /drivers/acpi | |
| parent | a3487d8f30635e3fa9db986cee6fca8012a996f4 (diff) | |
| download | linux-21ba237926227121dacccaf5d7863b0cb50f3eda.tar.gz linux-21ba237926227121dacccaf5d7863b0cb50f3eda.tar.bz2 linux-21ba237926227121dacccaf5d7863b0cb50f3eda.zip | |
ACPI: PM: Avoid evaluating _PS3 on transitions from D3hot to D3cold
If the power state of a device with ACPI PM is changed from D3hot to
D3cold, it merely is a matter of dropping references to additional
power resources (specifically, those in the list returned by _PR3),
and the _PS3 method should not be invoked for the device then (as
it has already been evaluated during the previous transition to
D3hot).
Fixes: 20dacb71ad28 (ACPI / PM: Rework device power management to follow ACPI 6)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/device_pm.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c index b859d75eaf9f..3269a4e8b902 100644 --- a/drivers/acpi/device_pm.c +++ b/drivers/acpi/device_pm.c @@ -210,9 +210,15 @@ int acpi_device_set_power(struct acpi_device *device, int state) return -ENODEV; } - result = acpi_dev_pm_explicit_set(device, state); - if (result) - goto end; + /* + * If the device goes from D3hot to D3cold, _PS3 has been + * evaluated for it already, so skip it in that case. + */ + if (device->power.state < ACPI_STATE_D3_HOT) { + result = acpi_dev_pm_explicit_set(device, state); + if (result) + goto end; + } if (device->power.flags.power_resources) result = acpi_power_transition(device, target_state); |