On Mon, 12 Nov 2012, Lan Tianyu wrote: > >> This will consume more power than suspend it > >> agian. > > > > No it won't, because the device will suspend itself after 3 ms. > But the premise is "they see a constant Idle state on their upstream > facing bus lines for more than 3.0 ms", that means the port's suspend > feature should be set to prevent all the bus activity(e.g sof), right? No, it only means that the port doesn't transmit packets. This could be because the port's suspend feature is set, or it could be because the port's enable feature is clear. > Now I have another concern that the device will maintain address 0 after > repower and not reset-resume. What happen if another device was plugged in? If the port isn't enabled, it doesn't matter. Alan Stern -- 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
