diff options
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index df603a817a98..c2a0f64f8d1e 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -1143,6 +1143,37 @@ static void dwc3_prepare_one_trb_sg(struct dwc3_ep *dep, req->request.short_not_ok, req->request.no_interrupt, req->request.is_last); + } else if (req->request.zero && req->request.length && + !usb_endpoint_xfer_isoc(dep->endpoint.desc) && + !rem && !chain) { + struct dwc3 *dwc = dep->dwc; + struct dwc3_trb *trb; + + req->needs_extra_trb = true; + + /* Prepare normal TRB */ + dwc3_prepare_one_trb(dep, req, trb_length, true, i); + + /* Prepare one extra TRB to handle ZLP */ + trb = &dep->trb_pool[dep->trb_enqueue]; + req->num_trbs++; + __dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr, 0, + !req->direction, 1, + req->request.stream_id, + req->request.short_not_ok, + req->request.no_interrupt, + req->request.is_last); + + /* Prepare one more TRB to handle MPS alignment */ + if (!req->direction) { + trb = &dep->trb_pool[dep->trb_enqueue]; + req->num_trbs++; + __dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr, maxp, + false, 1, req->request.stream_id, + req->request.short_not_ok, + req->request.no_interrupt, + req->request.is_last); + } } else { dwc3_prepare_one_trb(dep, req, trb_length, chain, i); } |