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    Subject[PATCH 5/6] iio: hid-sensors: use asynchronous resume
    Date
    Some platforms power off sensor hubs during S3 suspend, which will require
    longer time to resume. This hurts system resume time, so resume
    asynchronously.

    Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
    ---
    drivers/iio/common/hid-sensors/hid-sensor-trigger.c | 21 ++++++++++++++++++++-
    include/linux/hid-sensor-hub.h | 1 +
    2 files changed, 21 insertions(+), 1 deletion(-)

    diff --git a/drivers/iio/common/hid-sensors/hid-sensor-trigger.c b/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
    index 5b41f9d..9784ae3 100644
    --- a/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
    +++ b/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
    @@ -122,6 +122,14 @@ int hid_sensor_power_state(struct hid_sensor_common *st, bool state)
    #endif
    }

    +static void hid_sensor_set_power_work(struct work_struct *work)
    +{
    + struct hid_sensor_common *attrb = container_of(work,
    + struct hid_sensor_common,
    + work);
    + _hid_sensor_power_state(attrb, true);
    +}
    +
    static int hid_sensor_data_rdy_trigger_set_state(struct iio_trigger *trig,
    bool state)
    {
    @@ -170,6 +178,9 @@ int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
    goto error_unreg_trigger;

    iio_device_set_drvdata(indio_dev, attrb);
    +
    + INIT_WORK(&attrb->work, hid_sensor_set_power_work);
    +
    pm_suspend_ignore_children(&attrb->pdev->dev, true);
    pm_runtime_enable(&attrb->pdev->dev);
    /* Default to 3 seconds, but can be changed from sysfs */
    @@ -202,7 +213,15 @@ static int hid_sensor_resume(struct device *dev)
    struct platform_device *pdev = to_platform_device(dev);
    struct iio_dev *indio_dev = platform_get_drvdata(pdev);
    struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
    + schedule_work(&attrb->work);
    + return 0;
    +}

    +static int hid_sensor_runtime_resume(struct device *dev)
    +{
    + struct platform_device *pdev = to_platform_device(dev);
    + struct iio_dev *indio_dev = platform_get_drvdata(pdev);
    + struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
    return _hid_sensor_power_state(attrb, true);
    }

    @@ -211,7 +230,7 @@ static int hid_sensor_resume(struct device *dev)
    const struct dev_pm_ops hid_sensor_pm_ops = {
    SET_SYSTEM_SLEEP_PM_OPS(hid_sensor_suspend, hid_sensor_resume)
    SET_RUNTIME_PM_OPS(hid_sensor_suspend,
    - hid_sensor_resume, NULL)
    + hid_sensor_runtime_resume, NULL)
    };
    EXPORT_SYMBOL(hid_sensor_pm_ops);

    diff --git a/include/linux/hid-sensor-hub.h b/include/linux/hid-sensor-hub.h
    index c02b5ce..dd85f35 100644
    --- a/include/linux/hid-sensor-hub.h
    +++ b/include/linux/hid-sensor-hub.h
    @@ -236,6 +236,7 @@ struct hid_sensor_common {
    struct hid_sensor_hub_attribute_info report_state;
    struct hid_sensor_hub_attribute_info power_state;
    struct hid_sensor_hub_attribute_info sensitivity;
    + struct work_struct work;
    };

    /* Convert from hid unit expo to regular exponent */
    --
    2.5.5
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