Am Donnerstag, 26. Januar 2012, 00:36:08 schrieb Sarah Sharp: > The USB 3.0 bus specification introduces a new type of power management > called function suspend. The idea is to be able to suspend different > functions (i.e. a scanner or an SD card reader on a USB printer) > independently. A device can be in U0, but have one or more functions > suspended. Thus, signaling a function resume with the standard device > remote wake signaling was not possible. > > Instead, a device will (without prompt from the host) send a "device > notification" for the function remote wake. A new Set Feature Function > Remote Wa First, this is no criticism of this patch. Second, it seems to me that in the long run, this is asking for trouble. IMHO the function should be represented in the device tree between the device and the interfaces. We have the same constraints as for interfaces and devices. A function's interfaces cannot do PM independently and suspending a device means suspending all its functions. We'd get the handling of multifunction devices for free putting functions into the device tree. Regards Oliver -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
