On Thu, 8 May 2014, Felipe Balbi wrote: > > The dwc3 driver should always prepare a buffer for the next ep0 SETUP > > packet as soon as it retrieves the information for the current SETUP > > packet from the buffer. > > > > Otherwise, as you described it, if the gadget driver never sends its > > delayed status response then the UDC will never respond to any more > > control transfers. > > we _do_ prepare transfers for setup packet everytime a Status phase is > completed (we also restart ep0 in case of stalls): I said that dwc3 should prepare a buffer for a SETUP packet every time a _SETUP_ stage is completed -- not every time a _STATUS_ stage is completed. In principle the host can send a SETUP packet at any time, even in the middle of an ongoing transfer. (Consider the case where a driver on the host unlinks a control transfer before it has completed and then submits a new one.) 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
