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Bluetooth: hci_bcm: Streamline runtime PM code 

This driver seeks to force the Bluetooth device on for the duration of
5 seconds when the Bluetooth device has woken the host and after a
complete packet has been received.  It does that by calling:

    pm_runtime_get();
    pm_runtime_mark_last_busy();
    pm_runtime_put_autosuspend();

The same can be achieved more succinctly with:

    pm_request_resume();

That's because after runtime resuming the device, rpm_resume() invokes
pm_runtime_mark_last_busy() followed by rpm_idle(), which will cause
the device to be suspended after expiration of the autosuspend_delay.

No functional change intended.

Cc: Frédéric Danis <frederic.danis.oss@gmail.com>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Lukas Wunner 2017-12-26 17:07:34 +02:00 committed by Marcel Holtmann
parent 27378f4c1b
commit 43fff76834
1 changed files with 3 additions and 8 deletions
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11
drivers/bluetooth/hci_bcm.c
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@ -191,9 +191,7 @@ static irqreturn_t bcm_host_wake(int irq, void *data)
bt_dev_dbg(bdev, "Host wake IRQ");
pm_runtime_get(bdev->dev);
pm_runtime_mark_last_busy(bdev->dev);
pm_runtime_put_autosuspend(bdev->dev);
pm_request_resume(bdev->dev);
return IRQ_HANDLED;
}
@ -512,11 +510,8 @@ static int bcm_recv(struct hci_uart *hu, const void *data, int count)
} else if (!bcm->rx_skb) {
/* Delay auto-suspend when receiving completed packet */
mutex_lock(&bcm_device_lock);
if (bcm->dev && bcm_device_exists(bcm->dev)) {
pm_runtime_get(bcm->dev->dev);
pm_runtime_mark_last_busy(bcm->dev->dev);
pm_runtime_put_autosuspend(bcm->dev->dev);
}
if (bcm->dev && bcm_device_exists(bcm->dev))
pm_request_resume(bcm->dev->dev);
mutex_unlock(&bcm_device_lock);
}