usb: dwc3: remove special status request handling in ep0

The GetStatus (STD)-request is handled the driver and uses a tiny hack
to send the two bytes long answer. This patch removes the custom hack
uses the normal usb_ep_queue() for that.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

2 files changed, 8 insertions, 25 deletions

diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 6f1e8c98d78..bebb5e1530a 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -575,7 +575,6 @@ struct dwc3_hwparams {
  * @mode: mode of operation
  * @is_selfpowered: true when we are selfpowered
  * @three_stage_setup: set if we perform a three phase setup
- * @ep0_status_pending: ep0 status response without a req is pending
  * @ep0_bounced: true when we used bounce buffer
  * @ep0_expect_in: true when we expect a DATA IN transfer
  * @start_config_issued: true when StartConfig command has been issued
@@ -630,7 +629,6 @@ struct dwc3 {
 
         unsigned                is_selfpowered:1;
         unsigned                three_stage_setup:1;
-        unsigned                ep0_status_pending:1;
         unsigned                ep0_bounced:1;
         unsigned                ep0_expect_in:1;
         unsigned                start_config_issued:1;
diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index 900627cf860..13c898b4cc1 100644
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -191,8 +191,7 @@ int dwc3_gadget_ep0_queue(struct usb_ep *ep, struct usb_request *request,
 
         /* we share one TRB for ep0/1 */
         if (!list_empty(&dwc->eps[0]->request_list) ||
-                        !list_empty(&dwc->eps[1]->request_list) ||
-                        dwc->ep0_status_pending) {
+                        !list_empty(&dwc->eps[1]->request_list)) {
                 ret = -EBUSY;
                 goto out;
         }
@@ -224,7 +223,6 @@ static void dwc3_ep0_stall_and_restart(struct dwc3 *dwc)
                 dwc3_gadget_giveback(dep, req, -ECONNRESET);
         }
 
-        dwc->ep0_status_pending = 0;
         dwc->ep0state = EP0_SETUP_PHASE;
         dwc3_ep0_out_start(dwc);
 }
@@ -255,13 +253,9 @@ static struct dwc3_ep *dwc3_wIndex_to_dep(struct dwc3 *dwc, __le16 wIndex_le)
         return NULL;
 }
 
-static void dwc3_ep0_send_status_response(struct dwc3 *dwc)
+static void dwc3_ep0_status_cmpl(struct usb_ep *ep, struct usb_request *req)
 {
-        dwc3_ep0_start_trans(dwc, 1, dwc->setup_buf_addr,
-                        dwc->ep0_usb_req.length,
-                        DWC3_TRBCTL_CONTROL_DATA);
 }
-
 /*
  * ch 9.4.5
  */
@@ -304,9 +298,10 @@ static int dwc3_ep0_handle_status(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl
         response_pkt = (__le16 *) dwc->setup_buf;
         *response_pkt = cpu_to_le16(usb_status);
         dwc->ep0_usb_req.length = sizeof(*response_pkt);
-        dwc->ep0_status_pending = 1;
-
-        return 0;
+        dwc->ep0_usb_req.dma = dwc->setup_buf_addr;
+        dwc->ep0_usb_req.complete = dwc3_ep0_status_cmpl;
+        return usb_ep_queue(&dwc->eps[1]->endpoint, &dwc->ep0_usb_req,
+                        GFP_ATOMIC);
 }
 
 static int dwc3_ep0_handle_feature(struct dwc3 *dwc,
@@ -567,13 +562,8 @@ static void dwc3_ep0_complete_data(struct dwc3 *dwc,
 
         dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
 
-        if (!dwc->ep0_status_pending) {
-                r = next_request(&dwc->eps[0]->request_list);
-                ur = &r->request;
-        } else {
-                ur = &dwc->ep0_usb_req;
-                dwc->ep0_status_pending = 0;
-        }
+        r = next_request(&dwc->eps[0]->request_list);
+        ur = &r->request;
 
         dwc3_trb_to_nat(dwc->ep0_trb, &trb);
 
@@ -665,11 +655,6 @@ static void dwc3_ep0_do_control_data(struct dwc3 *dwc,
         dep = dwc->eps[0];
         dwc->ep0state = EP0_DATA_PHASE;
 
-        if (dwc->ep0_status_pending) {
-                dwc3_ep0_send_status_response(dwc);
-                return;
-        }
-
         if (list_empty(&dep->request_list)) {
                 dev_vdbg(dwc->dev, "pending request for EP0 Data phase\n");
                 dep->flags |= DWC3_EP_PENDING_REQUEST;