Am Dienstag, 26. Juli 2011, 10:17:59 schrieb Ming Lei: > > This precise instruction is a fairly clear indication that the > > rhdev->bus_mA value is a per-port limit and not a global hub limit. > > Otherwise, there wouldn't have been this maximum value of 500mA. > > I understand 500mA is shared by all bus-powered devices attached to > the port of root hub, so rhdev->bus_mA should be used as global value. > And for each individual port of root hub, the max power is 500mA. Some very small battery powered devices (IIRC it was reported for a device called Spitz by Pavel Machek) cannot supply the full 500mA. Hence we have code to deal with this special situation. 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
