Anshuman has requested, on behalf of Chrome OS, that all USB wakeup events be reported to the PM core, using pm_wakeup_event(). Currently such events are not reported if they originate from devices attached to USB-2 root-hub ports. This is because of the timing during system resume; we make it go as fast as possible, deliberately starting a host-initiated port resume before a root-hub port has had enough time to go through a complete remote-wakeup cycle.
This patch fills the gap by making the hub driver query each root hub during resume for ports which have started a remote-wakeup cycle but not yet finished it. The child devices attached to these ports are then reported to the PM core as potential sources of the current wakeup. This requires adding a new HCD method, for getting a bitmap of resuming ports. The patch series implements this new method only for the ehci-hcd and xhci-hcd drivers. Other HCDs may care to implement it later on, or they may not -- the information isn't terribly critical. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
