usb: dwc3: ep0: drop dead code

There's no such thing as XferNotReady(SETUP), we
can safely drop all that code with no problems
whatsoever.

Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc3/core.h

@@ -457,7 +457,6 @@ enum dwc3_phy {
 enum dwc3_ep0_next {
 	DWC3_EP0_UNKNOWN = 0,
 	DWC3_EP0_COMPLETE,
-	DWC3_EP0_NRDY_SETUP,
 	DWC3_EP0_NRDY_DATA,
 	DWC3_EP0_NRDY_STATUS,
 };
@@ -779,7 +778,6 @@ struct dwc3_event_depevt {
 #define DEPEVT_STREAMEVT_NOTFOUND	2
 
 /* Control-only Status */
-#define DEPEVT_STATUS_CONTROL_SETUP	0
 #define DEPEVT_STATUS_CONTROL_DATA	1
 #define DEPEVT_STATUS_CONTROL_STATUS	2
 

drivers/usb/dwc3/ep0.c

@@ -809,12 +809,6 @@ static void dwc3_ep0_xfer_complete(struct dwc3 *dwc,
 	}
 }
 
-static void dwc3_ep0_do_control_setup(struct dwc3 *dwc,
-		const struct dwc3_event_depevt *event)
-{
-	dwc3_ep0_out_start(dwc);
-}
-
 static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
 		struct dwc3_ep *dep, struct dwc3_request *req)
 {
@@ -926,50 +920,7 @@ static void dwc3_ep0_xfernotready(struct dwc3 *dwc,
 {
 	dwc->setup_packet_pending = true;
 
-	/*
-	 * This part is very tricky: If we have just handled
-	 * XferNotReady(Setup) and we're now expecting a
-	 * XferComplete but, instead, we receive another
-	 * XferNotReady(Setup), we should STALL and restart
-	 * the state machine.
-	 *
-	 * In all other cases, we just continue waiting
-	 * for the XferComplete event.
-	 *
-	 * We are a little bit unsafe here because we're
-	 * not trying to ensure that last event was, indeed,
-	 * XferNotReady(Setup).
-	 *
-	 * Still, we don't expect any condition where that
-	 * should happen and, even if it does, it would be
-	 * another error condition.
-	 */
-	if (dwc->ep0_next_event == DWC3_EP0_COMPLETE) {
-		switch (event->status) {
-		case DEPEVT_STATUS_CONTROL_SETUP:
-			dev_vdbg(dwc->dev, "Unexpected XferNotReady(Setup)\n");
-			dwc3_ep0_stall_and_restart(dwc);
-			break;
-		case DEPEVT_STATUS_CONTROL_DATA:
-			/* FALLTHROUGH */
-		case DEPEVT_STATUS_CONTROL_STATUS:
-			/* FALLTHROUGH */
-		default:
-			dev_vdbg(dwc->dev, "waiting for XferComplete\n");
-		}
-
-		return;
-	}
-
 	switch (event->status) {
-	case DEPEVT_STATUS_CONTROL_SETUP:
-		dev_vdbg(dwc->dev, "Control Setup\n");
-
-		dwc->ep0state = EP0_SETUP_PHASE;
-
-		dwc3_ep0_do_control_setup(dwc, event);
-		break;
-
 	case DEPEVT_STATUS_CONTROL_DATA:
 		dev_vdbg(dwc->dev, "Control Data\n");