3.16.42-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx> commit 6b9018d4c1e5c958625be94a160a5984351d4632 upstream. In case of High-Speed, High-Bandwidth endpoints, we need to tell DWC3 that we have more than one packet per interval. We do that by setting PCM1 field of Isochronous-First TRB. Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx> [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx> --- --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -863,6 +863,8 @@ static void dwc3_prepare_one_trb(struct { struct dwc3 *dwc = dep->dwc; struct dwc3_trb *trb; + struct usb_gadget *gadget = &dwc->gadget; + enum usb_device_speed speed = gadget->speed; dev_vdbg(dwc->dev, "%s: req %p dma %08llx length %d%s%s\n", dep->name, req, (unsigned long long) dma, @@ -895,10 +897,16 @@ static void dwc3_prepare_one_trb(struct break; case USB_ENDPOINT_XFER_ISOC: - if (!node) + if (!node) { trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST; - else + + if (speed == USB_SPEED_HIGH) { + struct usb_ep *ep = &dep->endpoint; + trb->size |= DWC3_TRB_SIZE_PCM1(ep->mult - 1); + } + } else { trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS; + } break; case USB_ENDPOINT_XFER_BULK: