usb: dwc3: gadget: check for Missed Isoc from event status

In case we get an event with status set to Missed Isoc, this means we
have missed an isochronous interval and should issue End Transfer
command and wait for the following XferNotReady.

Let's do that early, rather than late.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/dwc3/core.h

@@ -1204,11 +1204,12 @@ struct dwc3_event_depevt {
 /* Within XferNotReady */
 #define DEPEVT_STATUS_TRANSFER_ACTIVE	BIT(3)
 
-/* Within XferComplete */
+/* Within XferComplete or XferInProgress */
 #define DEPEVT_STATUS_BUSERR	BIT(0)
 #define DEPEVT_STATUS_SHORT	BIT(1)
 #define DEPEVT_STATUS_IOC	BIT(2)
-#define DEPEVT_STATUS_LST	BIT(3)
+#define DEPEVT_STATUS_LST	BIT(3) /* XferComplete */
+#define DEPEVT_STATUS_MISSED_ISOC BIT(3) /* XferInProgress */
 
 /* Stream event only */
 #define DEPEVT_STREAMEVT_FOUND		1

drivers/usb/dwc3/gadget.c

@@ -2396,9 +2396,6 @@ static void dwc3_gadget_ep_cleanup_completed_requests(struct dwc3_ep *dep,
 			 * entry is added into request list.
 			 */
 			dep->flags = DWC3_EP_PENDING_REQUEST;
-		} else {
-			dwc3_stop_active_transfer(dep, true);
-			dep->flags = DWC3_EP_ENABLED;
 		}
 	}
 }
@@ -2418,14 +2415,25 @@ static void dwc3_gadget_endpoint_transfer_in_progress(struct dwc3_ep *dep,
 {
 	struct dwc3		*dwc = dep->dwc;
 	unsigned		status = 0;
+	bool			stop = false;
 
 	dwc3_gadget_endpoint_frame_from_event(dep, event);
 
 	if (event->status & DEPEVT_STATUS_BUSERR)
 		status = -ECONNRESET;
 
+	if (event->status & DEPEVT_STATUS_MISSED_ISOC) {
+		status = -EXDEV;
+		stop = true;
+	}
+
 	dwc3_gadget_ep_cleanup_completed_requests(dep, event, status);
 
+	if (stop) {
+		dwc3_stop_active_transfer(dep, true);
+		dep->flags = DWC3_EP_ENABLED;
+	}
+
 	/*
 	 * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.
 	 * See dwc3_gadget_linksts_change_interrupt() for 1st half.