usb: dwc3: gadget: Refactor TRB completion handler

To prepare for handling of XferComplete event, let's refactor and split
up dwc3_gadget_endpoint_transfer_in_progress() to handle TRBs completion
for different events. The handling of TRBs completion will be the same,
but the status of XferComplete event is different than XferInProgress.
No functional change in this commit.
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

drivers/usb/dwc3/gadget.c

@@ -2654,34 +2654,22 @@ static void dwc3_gadget_endpoint_frame_from_event(struct dwc3_ep *dep,
 	dep->frame_number = event->parameters;
 }
 
-static void dwc3_gadget_endpoint_transfer_in_progress(struct dwc3_ep *dep,
-		const struct dwc3_event_depevt *event)
+static bool dwc3_gadget_endpoint_trbs_complete(struct dwc3_ep *dep,
+		const struct dwc3_event_depevt *event, int status)
 {
 	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;
-
-		if (list_empty(&dep->started_list))
-			stop = true;
-	}
+	bool			no_started_trb = true;
 
 	dwc3_gadget_ep_cleanup_completed_requests(dep, event, status);
 
 	if (dep->flags & DWC3_EP_END_TRANSFER_PENDING)
 		goto out;
 
-	if (stop)
+	if (status == -EXDEV && list_empty(&dep->started_list))
 		dwc3_stop_active_transfer(dep, true, true);
 	else if (dwc3_gadget_ep_should_continue(dep))
-		__dwc3_gadget_kick_transfer(dep);
+		if (__dwc3_gadget_kick_transfer(dep) == 0)
+			no_started_trb = false;
 
 out:
 	/*
@@ -2699,7 +2687,7 @@ static void dwc3_gadget_endpoint_transfer_in_progress(struct dwc3_ep *dep,
 				continue;
 
 			if (!list_empty(&dep->started_list))
-				return;
+				return no_started_trb;
 		}
 
 		reg = dwc3_readl(dwc->regs, DWC3_DCTL);
@@ -2708,6 +2696,25 @@ static void dwc3_gadget_endpoint_transfer_in_progress(struct dwc3_ep *dep,
 
 		dwc->u1u2 = 0;
 	}
+
+	return no_started_trb;
+}
+
+static void dwc3_gadget_endpoint_transfer_in_progress(struct dwc3_ep *dep,
+		const struct dwc3_event_depevt *event)
+{
+	int status = 0;
+
+	if (usb_endpoint_xfer_isoc(dep->endpoint.desc))
+		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;
+
+	dwc3_gadget_endpoint_trbs_complete(dep, event, status);
 }
 
 static void dwc3_gadget_endpoint_transfer_not_ready(struct dwc3_ep *dep,