diff options
Diffstat (limited to 'drivers/acpi/device_pm.c')
| -rw-r--r-- | drivers/acpi/device_pm.c | 43 |
1 files changed, 36 insertions, 7 deletions
diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c index d047739f3380..9e5fd9c440b7 100644 --- a/drivers/acpi/device_pm.c +++ b/drivers/acpi/device_pm.c @@ -900,18 +900,46 @@ EXPORT_SYMBOL_GPL(acpi_dev_resume_early); */ int acpi_subsys_prepare(struct device *dev) { - /* - * Devices having power.ignore_children set may still be necessary for - * suspending their children in the next phase of device suspend. - */ - if (dev->power.ignore_children) - pm_runtime_resume(dev); + struct acpi_device *adev = ACPI_COMPANION(dev); + u32 sys_target; + int ret, state; + + ret = pm_generic_prepare(dev); + if (ret < 0) + return ret; + + if (!adev || !pm_runtime_suspended(dev) + || device_may_wakeup(dev) != !!adev->wakeup.prepare_count) + return 0; + + sys_target = acpi_target_system_state(); + if (sys_target == ACPI_STATE_S0) + return 1; - return pm_generic_prepare(dev); + if (adev->power.flags.dsw_present) + return 0; + + ret = acpi_dev_pm_get_state(dev, adev, sys_target, NULL, &state); + return !ret && state == adev->power.state; } EXPORT_SYMBOL_GPL(acpi_subsys_prepare); /** + * acpi_subsys_complete - Finalize device's resume during system resume. + * @dev: Device to handle. + */ +static void acpi_subsys_complete(struct device *dev) +{ + /* + * If the device had been runtime-suspended before the system went into + * the sleep state it is going out of and it has never been resumed till + * now, resume it in case the firmware powered it up. + */ + if (dev->power.direct_complete) + pm_request_resume(dev); +} + +/** * acpi_subsys_suspend - Run the device driver's suspend callback. * @dev: Device to handle. * @@ -979,6 +1007,7 @@ static struct dev_pm_domain acpi_general_pm_domain = { #endif #ifdef CONFIG_PM_SLEEP .prepare = acpi_subsys_prepare, + .complete = acpi_subsys_complete, .suspend = acpi_subsys_suspend, .suspend_late = acpi_subsys_suspend_late, .resume_early = acpi_subsys_resume_early, |