usb/core/hub.c

1274 			 * If there was an overcurrent or suspend change
1277 			 * for USB 3.0 hubs, since they don't have a suspend
1851 	 * Set default autosuspend delay as 0 to speedup bus suspend,
1875 	 * - The patch may cause one or more auto suspend/resume on
1880 	 *   suspend timer for hub, also may decrease power consumption
1892 	 * Hubs have proper suspend/resume support, except for root hubs
2418 		/* enable HNP before suspend, it's simpler */
3408  * usb_port_suspend - suspend a usb device's upstream port
3413  * Devices may wake out of a suspend, if anything important happens,
3415  * suspend by the host, using usb_port_resume().  It's also routine
3421  * Selective port suspend reduces power; most suspended devices draw
3425  * Devices leave suspend state when the host wakes them up.  Some devices
3434  * Devices on USB hub ports have only one "suspend" state, corresponding
3438  *   - suspend, resume ... when the VBUS power link stays live
3439  *   - suspend, disconnect ... VBUS lost
3448  * suspended until their bus goes into global suspend (i.e., the root
3486 		dev_err(&udev->dev, "Failed to disable LTM before suspend\n");
3497 	 * For system suspend, we do not need to enable the suspend feature
3499 	 * into suspend a few ms after the root hub stops sending packets.
3500 	 * The USB 2.0 spec calls this "global suspend".
3503 	 * from a downstream port if the port's suspend feature isn't on.
3504 	 * Therefore we will turn on the suspend feature if udev or any of its
3527 				"suspend timeout, status %04x\n", portstatus);
3535 		dev_dbg(&port_dev->dev, "can't suspend, status %d\n", status);
3558 			/* device has up to 10 msec to fully suspend */
3575  * If the USB "suspend" state is in use (rather than "global suspend"),
3576  * many devices will be individually taken out of suspend state using
3597 	 * during many timeouts, but hub_wq can't suspend until later.
3686  * FIXME: If a device was connected before suspend, but was removed
3729  * For example, if a host controller doesn't maintain VBUS suspend current
6007 	.suspend =	hub_suspend,