> From: Alan Stern [mailto:stern@xxxxxxxxxxxxxxxxxxx] > Sent: Wednesday, February 27, 2013 7:22 AM > > On Tue, 26 Feb 2013, Paul Zimmerman wrote: > > > +static struct hc_driver dwc2_hc_driver = { > > + .description = "dwc2_hsotg", > > + .product_desc = "DWC OTG Controller", > > + .hcd_priv_size = sizeof(struct wrapper_priv_data), > > + > > + .irq = _dwc2_hcd_irq, > > + .flags = HCD_MEMORY | HCD_USB2, > > + > > + .start = _dwc2_hcd_start, > > + .stop = _dwc2_hcd_stop, > > + .urb_enqueue = _dwc2_hcd_urb_enqueue, > > + .urb_dequeue = _dwc2_hcd_urb_dequeue, > > + .endpoint_disable = _dwc2_hcd_endpoint_disable, > > + .endpoint_reset = _dwc2_hcd_endpoint_reset, > > + .get_frame_number = _dwc2_hcd_get_frame_number, > > + > > + .hub_status_data = _dwc2_hcd_hub_status_data, > > + .hub_control = _dwc2_hcd_hub_control, > > +}; > > Paul: > > I'm a little puzzled how this driver manages without a > clear_tt_buffer_complete callback, or indeed, without calling > usb_hub_clear_tt_buffer anywhere. Does the hardware manage this for > you automatically, or is it an oversight? Hi Alan, That involves sending a Clear_TT_Buffer request to the downstream hub, right? No, the hardware doesn't do that automatically, so I guess this is an oversight. I can implement that, but do you know of any practical way to test it? That would involve inducing some sort of error on the bus during a split transaction, right? -- Paul -- 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
