diff options
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index ec142724e85c..f091e107d9cb 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -1197,7 +1197,27 @@ static int dwc3_prepare_one_trb_sg(struct dwc3_ep *dep, break; } + return req->num_trbs - num_trbs; + out: + /* + * If we run out of TRBs for MPS alignment setup, then set IOC on the + * previous TRB to get notified for TRB completion to resume when more + * TRBs are available. + * + * Note: normally we shouldn't update the TRB after the HWO bit is set. + * However, the controller doesn't update its internal cache to handle + * the newly prepared TRBs until UPDATE_TRANSFER or START_TRANSFER + * command is executed. At this point, it doesn't happen yet, so we + * should be fine modifying it here. + */ + if (i) { + struct dwc3_trb *trb; + + trb = dwc3_ep_prev_trb(dep, dep->trb_enqueue); + trb->ctrl |= DWC3_TRB_CTRL_IOC; + } + return req->num_trbs - num_trbs; } |