usb: dwc2: gadget: Add endpoint wedge support

Add enpoint wedge support. Tested by USBCV MSC tests.

Signed-off-by: Argishti Aleksanyan <Argishti.Aleksanyan@synopsys.com>
Signed-off-by: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
Link: https://lore.kernel.org/r/3143ea6b8eee08761709a6c2788216292be46a34.1626087390.git.Minas.Harutyunyan@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/dwc2/core.h

@@ -122,6 +122,7 @@ struct dwc2_hsotg_req;
  * @periodic: Set if this is a periodic ep, such as Interrupt
  * @isochronous: Set if this is a isochronous ep
  * @send_zlp: Set if we need to send a zero-length packet.
+ * @wedged: Set if ep is wedged.
  * @desc_list_dma: The DMA address of descriptor chain currently in use.
  * @desc_list: Pointer to descriptor DMA chain head currently in use.
  * @desc_count: Count of entries within the DMA descriptor chain of EP.
@@ -172,6 +173,7 @@ struct dwc2_hsotg_ep {
 	unsigned int            periodic:1;
 	unsigned int            isochronous:1;
 	unsigned int            send_zlp:1;
+	unsigned int            wedged:1;
 	unsigned int            target_frame;
 #define TARGET_FRAME_INITIAL   0xFFFFFFFF
 	bool			frame_overrun;

drivers/usb/dwc2/gadget.c

@@ -1806,7 +1806,8 @@ static int dwc2_hsotg_process_req_feature(struct dwc2_hsotg *hsotg,
 		case USB_ENDPOINT_HALT:
 			halted = ep->halted;
 
-			dwc2_hsotg_ep_sethalt(&ep->ep, set, true);
+			if (!ep->wedged)
+				dwc2_hsotg_ep_sethalt(&ep->ep, set, true);
 
 			ret = dwc2_hsotg_send_reply(hsotg, ep0, NULL, 0);
 			if (ret) {
@@ -4046,6 +4047,7 @@ static int dwc2_hsotg_ep_enable(struct usb_ep *ep,
 	hs_ep->isochronous = 0;
 	hs_ep->periodic = 0;
 	hs_ep->halted = 0;
+	hs_ep->wedged = 0;
 	hs_ep->interval = desc->bInterval;
 
 	switch (ep_type) {
@@ -4286,6 +4288,27 @@ static int dwc2_hsotg_ep_dequeue(struct usb_ep *ep, struct usb_request *req)
 	return 0;
 }
 
+/**
+ * dwc2_gadget_ep_set_wedge - set wedge on a given endpoint
+ * @ep: The endpoint to be wedged.
+ *
+ */
+static int dwc2_gadget_ep_set_wedge(struct usb_ep *ep)
+{
+	struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
+	struct dwc2_hsotg *hs = hs_ep->parent;
+
+	unsigned long	flags;
+	int		ret;
+
+	spin_lock_irqsave(&hs->lock, flags);
+	hs_ep->wedged = 1;
+	ret = dwc2_hsotg_ep_sethalt(ep, 1, false);
+	spin_unlock_irqrestore(&hs->lock, flags);
+
+	return ret;
+}
+
 /**
  * dwc2_hsotg_ep_sethalt - set halt on a given endpoint
  * @ep: The endpoint to set halt.
@@ -4337,6 +4360,7 @@ static int dwc2_hsotg_ep_sethalt(struct usb_ep *ep, int value, bool now)
 				epctl |= DXEPCTL_EPDIS;
 		} else {
 			epctl &= ~DXEPCTL_STALL;
+			hs_ep->wedged = 0;
 			xfertype = epctl & DXEPCTL_EPTYPE_MASK;
 			if (xfertype == DXEPCTL_EPTYPE_BULK ||
 			    xfertype == DXEPCTL_EPTYPE_INTERRUPT)
@@ -4353,6 +4377,7 @@ static int dwc2_hsotg_ep_sethalt(struct usb_ep *ep, int value, bool now)
 			// STALL bit will be set in GOUTNAKEFF interrupt handler
 		} else {
 			epctl &= ~DXEPCTL_STALL;
+			hs_ep->wedged = 0;
 			xfertype = epctl & DXEPCTL_EPTYPE_MASK;
 			if (xfertype == DXEPCTL_EPTYPE_BULK ||
 			    xfertype == DXEPCTL_EPTYPE_INTERRUPT)
@@ -4392,6 +4417,7 @@ static const struct usb_ep_ops dwc2_hsotg_ep_ops = {
 	.queue		= dwc2_hsotg_ep_queue_lock,
 	.dequeue	= dwc2_hsotg_ep_dequeue,
 	.set_halt	= dwc2_hsotg_ep_sethalt_lock,
+	.set_wedge	= dwc2_gadget_ep_set_wedge,
 	/* note, don't believe we have any call for the fifo routines */
 };