Am Dienstag, 26. Juli 2011, 16:16:28 schrieb Alan Stern: > > I am afraid this is a true problem. We need to make the computation of > > the available power dynamic. The computation of hub->mA_per_port > > once is insufficient, as we cannot say that a limit valid for any port is valid > > for every port forever. > > You have misunderstood the purpose of hub->mA_per_port. It is not a > dynamic value reflecting the amount of current available at any moment. > Rather, it is a static upper limit reflecting the computations > prescribed by the USB-2.0 spec, section 7.2.1. The problem here is that the host violates the requirements of the section. It cannot supply both ports at the same time with enough power. We could ignore that issue. But if we don't, I think we need to go dynamic. Regards Oliver -- - - - SUSE LINUX Products GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 16746 (AG Nürnberg) Maxfeldstraße 5 90409 Nürnberg Germany - - - -- 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
