diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/acpi/device_pm.c | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c index a8e059f69d50..f09dc987cf17 100644 --- a/drivers/acpi/device_pm.c +++ b/drivers/acpi/device_pm.c @@ -599,10 +599,12 @@ static struct dev_pm_domain acpi_general_pm_domain = { /** * acpi_dev_pm_attach - Prepare device for ACPI power management. * @dev: Device to prepare. + * @power_on: Whether or not to power on the device. * * If @dev has a valid ACPI handle that has a valid struct acpi_device object * attached to it, install a wakeup notification handler for the device and - * add it to the general ACPI PM domain. + * add it to the general ACPI PM domain. If @power_on is set, the device will + * be put into the ACPI D0 state before the function returns. * * This assumes that the @dev's bus type uses generic power management callbacks * (or doesn't use any power management callbacks at all). @@ -610,7 +612,7 @@ static struct dev_pm_domain acpi_general_pm_domain = { * Callers must ensure proper synchronization of this function with power * management callbacks. */ -int acpi_dev_pm_attach(struct device *dev) +int acpi_dev_pm_attach(struct device *dev, bool power_on) { struct acpi_device *adev = acpi_dev_pm_get_node(dev); @@ -622,6 +624,10 @@ int acpi_dev_pm_attach(struct device *dev) acpi_add_pm_notifier(adev, acpi_wakeup_device, dev); dev->pm_domain = &acpi_general_pm_domain; + if (power_on) { + acpi_dev_pm_full_power(adev); + __acpi_device_run_wake(adev, false); + } return 0; } EXPORT_SYMBOL_GPL(acpi_dev_pm_attach); @@ -629,20 +635,34 @@ EXPORT_SYMBOL_GPL(acpi_dev_pm_attach); /** * acpi_dev_pm_detach - Remove ACPI power management from the device. * @dev: Device to take care of. + * @power_off: Whether or not to try to remove power from the device. * * Remove the device from the general ACPI PM domain and remove its wakeup - * notifier. + * notifier. If @power_off is set, additionally remove power from the device if + * possible. * * Callers must ensure proper synchronization of this function with power * management callbacks. */ -void acpi_dev_pm_detach(struct device *dev) +void acpi_dev_pm_detach(struct device *dev, bool power_off) { struct acpi_device *adev = acpi_dev_pm_get_node(dev); if (adev && dev->pm_domain == &acpi_general_pm_domain) { dev->pm_domain = NULL; acpi_remove_pm_notifier(adev, acpi_wakeup_device); + if (power_off) { + /* + * If the device's PM QoS resume latency limit or flags + * have been exposed to user space, they have to be + * hidden at this point, so that they don't affect the + * choice of the low-power state to put the device into. + */ + dev_pm_qos_hide_latency_limit(dev); + dev_pm_qos_hide_flags(dev); + __acpi_device_run_wake(adev, false); + acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0); + } } } EXPORT_SYMBOL_GPL(acpi_dev_pm_detach); |