On Mon, 7 Jun 2010, Gadiyar, Anand wrote: > Hi all, > > On the OMAP3, we have a new hardware bug that causes the > EHCI controller to lock up under heavy stress. The only > known way to recover is to soft-reset the controller. > > I'm trying to implement some kind of recovery mechanism > for the ehci-omap driver. Is there a way to inform the > USB core that the root-hub and down-stream devices have > been reset and need to be re-enumerated? There's usb_hc_died(). It tells the core that the controller has stopped working. The core then removes all devices below the root hub and marks the root hub as non-operational (the state is set to USB_STATE_NOTATTACHED). But there is no re-enumeration; from that point on the root hub is unusable. This may not be exactly what you want. Perhaps a better match would be usb_reset_device(), but that routine specifically excludes root hubs. You might be able to adjust it in some way, though. Another alternative is simply to unregister the hcd and then re-register it. 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
