usb: dwc3: gadget: use TRB type 6 for ISOC transfers

Type 6 should be used for the first transfer during an interval. This is
also what the reference driver is using. Type 7 seems to be for following
or additional transfers within the same interval.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index a324957..ebe6bbc 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -632,7 +632,7 @@ static struct dwc3_request *dwc3_prepare_trbs(struct dwc3_ep *dep,
                        break;
 
                case USB_ENDPOINT_XFER_ISOC:
-                       trb.trbctl = DWC3_TRBCTL_ISOCHRONOUS;
+                       trb.trbctl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;
 
                        /* IOC every DWC3_TRB_NUM / 4 so we can refill */
                        if (!(cur_slot % (DWC3_TRB_NUM / 4)))