usb: dwc3: gadget: remove duplicated missed isoc handling

Now, this part of the code is duplicated and brings no extra value to
the driver. Let's remove it.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Documentation/driver-api/usb/dwc3.rst

@@ -676,7 +676,6 @@ operations, both of which can be traced. Format is::
   	__entry->flags & DWC3_EP_WEDGE ? 'W' : 'w',
   	__entry->flags & DWC3_EP_TRANSFER_STARTED ? 'B' : 'b',
   	__entry->flags & DWC3_EP_PENDING_REQUEST ? 'P' : 'p',
-  	__entry->flags & DWC3_EP_MISSED_ISOC ? 'M' : 'm',
   	__entry->flags & DWC3_EP_END_TRANSFER_PENDING ? 'E' : 'e',
   	__entry->direction ? '<' : '>'
   )

drivers/usb/dwc3/core.h

@@ -664,7 +664,6 @@ struct dwc3_ep {
 #define DWC3_EP_WEDGE		BIT(2)
 #define DWC3_EP_TRANSFER_STARTED BIT(3)
 #define DWC3_EP_PENDING_REQUEST	BIT(5)
-#define DWC3_EP_MISSED_ISOC	BIT(6)
 #define DWC3_EP_END_TRANSFER_PENDING	BIT(7)
 
 	/* This last one is specific to EP0 */

drivers/usb/dwc3/gadget.c

@@ -1333,8 +1333,7 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
 			return 0;
 		}
 
-		if ((dep->flags & DWC3_EP_TRANSFER_STARTED) &&
-		    !(dep->flags & DWC3_EP_MISSED_ISOC))
+		if (dep->flags & DWC3_EP_TRANSFER_STARTED)
 			goto out;
 
 		return 0;
@@ -2229,7 +2228,6 @@ static int dwc3_gadget_ep_reclaim_completed_trb(struct dwc3_ep *dep,
 {
 	unsigned int		count;
 	unsigned int		s_pkt = 0;
-	unsigned int		trb_status;
 
 	dwc3_ep_inc_deq(dep);
 
@@ -2264,35 +2262,7 @@ static int dwc3_gadget_ep_reclaim_completed_trb(struct dwc3_ep *dep,
 	if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
 		return 1;
 
-	if (dep->direction) {
-		if (count) {
-			trb_status = DWC3_TRB_SIZE_TRBSTS(trb->size);
-			if (trb_status == DWC3_TRBSTS_MISSED_ISOC) {
-				/*
-				 * If missed isoc occurred and there is
-				 * no request queued then issue END
-				 * TRANSFER, so that core generates
-				 * next xfernotready and we will issue
-				 * a fresh START TRANSFER.
-				 * If there are still queued request
-				 * then wait, do not issue either END
-				 * or UPDATE TRANSFER, just attach next
-				 * request in pending_list during
-				 * giveback.If any future queued request
-				 * is successfully transferred then we
-				 * will issue UPDATE TRANSFER for all
-				 * request in the pending_list.
-				 */
-				dep->flags |= DWC3_EP_MISSED_ISOC;
-			} else {
-				dev_err(dep->dwc->dev, "incomplete IN transfer %s\n",
-						dep->name);
-				status = -ECONNRESET;
-			}
-		} else {
-			dep->flags &= ~DWC3_EP_MISSED_ISOC;
-		}
-	} else {
+	if (!dep->direction) {
 		if (count && (event->status & DEPEVT_STATUS_SHORT))
 			s_pkt = 1;
 	}

drivers/usb/dwc3/trace.h

@@ -303,7 +303,7 @@ DECLARE_EVENT_CLASS(dwc3_log_ep,
 		__entry->trb_enqueue = dep->trb_enqueue;
 		__entry->trb_dequeue = dep->trb_dequeue;
 	),
-	TP_printk("%s: mps %d/%d streams %d burst %d ring %d/%d flags %c:%c%c%c%c%c:%c:%c",
+	TP_printk("%s: mps %d/%d streams %d burst %d ring %d/%d flags %c:%c%c%c%c:%c:%c",
 		__get_str(name), __entry->maxpacket,
 		__entry->maxpacket_limit, __entry->max_streams,
 		__entry->maxburst, __entry->trb_enqueue,
@@ -313,7 +313,6 @@ DECLARE_EVENT_CLASS(dwc3_log_ep,
 		__entry->flags & DWC3_EP_WEDGE ? 'W' : 'w',
 		__entry->flags & DWC3_EP_TRANSFER_STARTED ? 'B' : 'b',
 		__entry->flags & DWC3_EP_PENDING_REQUEST ? 'P' : 'p',
-		__entry->flags & DWC3_EP_MISSED_ISOC ? 'M' : 'm',
 		__entry->flags & DWC3_EP_END_TRANSFER_PENDING ? 'E' : 'e',
 		__entry->direction ? '<' : '>'
 	)