dwc2/host: attach debouncing fixes

src/host/usbh.c

@@ -647,6 +647,21 @@ static void _control_blocking_complete_cb(tuh_xfer_t* xfer) {
   *((xfer_result_t*) xfer->user_data) = xfer->result;
 }
 
+TU_ATTR_ALWAYS_INLINE static inline void _control_set_xfer_stage(uint8_t stage) {
+  (void) osal_mutex_lock(_usbh_mutex, OSAL_TIMEOUT_WAIT_FOREVER);
+  _ctrl_xfer.stage = stage;
+  (void) osal_mutex_unlock(_usbh_mutex);
+}
+
+TU_ATTR_ALWAYS_INLINE static inline bool usbh_setup_send(uint8_t daddr, const uint8_t setup_packet[8]) {
+  const uint8_t rhport = usbh_get_rhport(daddr);
+  const bool ret = hcd_setup_send(rhport, daddr, setup_packet);
+  if (!ret) {
+    _control_set_xfer_stage(CONTROL_STAGE_IDLE);
+  }
+  return ret;
+}
+
 // TODO timeout_ms is not supported yet
 bool tuh_control_xfer (tuh_xfer_t* xfer) {
   TU_VERIFY(xfer->ep_addr == 0 && xfer->setup); // EP0 with setup packet
@@ -673,15 +688,13 @@ bool tuh_control_xfer (tuh_xfer_t* xfer) {
   (void) osal_mutex_unlock(_usbh_mutex);
 
   TU_VERIFY(is_idle);
-  const uint8_t rhport = usbh_get_rhport(daddr);
-
   TU_LOG_USBH("[%u:%u] %s: ", rhport, daddr,
               (xfer->setup->bmRequestType_bit.type == TUSB_REQ_TYPE_STANDARD && xfer->setup->bRequest <= TUSB_REQ_SYNCH_FRAME) ?
                   tu_str_std_request[xfer->setup->bRequest] : "Class Request");
   TU_LOG_BUF_USBH(xfer->setup, 8);
 
   if (xfer->complete_cb) {
-    TU_ASSERT(hcd_setup_send(rhport, daddr, (uint8_t const *) &_usbh_epbuf.request));
+    TU_ASSERT(usbh_setup_send(daddr, (uint8_t const *) &_usbh_epbuf.request));
   }else {
     // blocking if complete callback is not provided
     // change callback to internal blocking, and result as user argument
@@ -691,7 +704,7 @@ bool tuh_control_xfer (tuh_xfer_t* xfer) {
     _ctrl_xfer.user_data   = (uintptr_t) &result;
     _ctrl_xfer.complete_cb = _control_blocking_complete_cb;
 
-    TU_ASSERT(hcd_setup_send(rhport, daddr, (uint8_t *) &_usbh_epbuf.request));
+    TU_ASSERT(usbh_setup_send(daddr, (uint8_t const *) &_usbh_epbuf.request));
 
     while (result == XFER_RESULT_INVALID) {
       // Note: this can be called within an callback ie. part of tuh_task()
@@ -713,12 +726,6 @@ bool tuh_control_xfer (tuh_xfer_t* xfer) {
   return true;
 }
 
-TU_ATTR_ALWAYS_INLINE static inline void _set_control_xfer_stage(uint8_t stage) {
-  (void) osal_mutex_lock(_usbh_mutex, OSAL_TIMEOUT_WAIT_FOREVER);
-  _ctrl_xfer.stage = stage;
-  (void) osal_mutex_unlock(_usbh_mutex);
-}
-
 static void _control_xfer_complete(uint8_t daddr, xfer_result_t result) {
   TU_LOG_USBH("\r\n");
 
@@ -735,7 +742,7 @@ static void _control_xfer_complete(uint8_t daddr, xfer_result_t result) {
     .user_data   = _ctrl_xfer.user_data
   };
 
-  _set_control_xfer_stage(CONTROL_STAGE_IDLE);
+  _control_set_xfer_stage(CONTROL_STAGE_IDLE);
 
   if (xfer_temp.complete_cb) {
     xfer_temp.complete_cb(&xfer_temp);
@@ -764,7 +771,7 @@ static bool usbh_control_xfer_cb (uint8_t daddr, uint8_t ep_addr, xfer_result_t
         _ctrl_xfer.actual_len = 0; // reset actual_len
         (void) osal_mutex_unlock(_usbh_mutex);
 
-        TU_ASSERT(hcd_setup_send(rhport, daddr, (uint8_t const *) request));
+        TU_ASSERT(usbh_setup_send(daddr, (uint8_t const *) request));
       } else {
         TU_LOG_USBH("[%u:%u] Control FAILED, xferred_bytes = %" PRIu32 "\r\n", rhport, daddr, xferred_bytes);
         TU_LOG_BUF_USBH(request, 8);
@@ -777,8 +784,8 @@ static bool usbh_control_xfer_cb (uint8_t daddr, uint8_t ep_addr, xfer_result_t
         case CONTROL_STAGE_SETUP:
           if (request->wLength) {
             // DATA stage: initial data toggle is always 1
-            _set_control_xfer_stage(CONTROL_STAGE_DATA);
-            TU_ASSERT( hcd_edpt_xfer(rhport, daddr, tu_edpt_addr(0, request->bmRequestType_bit.direction), _ctrl_xfer.buffer, request->wLength) );
+            _control_set_xfer_stage(CONTROL_STAGE_DATA);
+            TU_ASSERT(hcd_edpt_xfer(rhport, daddr, tu_edpt_addr(0, request->bmRequestType_bit.direction), _ctrl_xfer.buffer, request->wLength));
             return true;
           }
         TU_ATTR_FALLTHROUGH;
@@ -792,7 +799,7 @@ static bool usbh_control_xfer_cb (uint8_t daddr, uint8_t ep_addr, xfer_result_t
         _ctrl_xfer.actual_len = (uint16_t) xferred_bytes;
 
         // ACK stage: toggle is always 1
-        _set_control_xfer_stage(CONTROL_STAGE_ACK);
+        _control_set_xfer_stage(CONTROL_STAGE_ACK);
         TU_ASSERT( hcd_edpt_xfer(rhport, daddr, tu_edpt_addr(0, 1 - request->bmRequestType_bit.direction), NULL, 0) );
         break;
 
@@ -854,7 +861,7 @@ bool tuh_edpt_abort_xfer(uint8_t daddr, uint8_t ep_addr) {
     // control transfer: only 1 control at a time, check if we are aborting the current one
     TU_VERIFY(daddr == _ctrl_xfer.daddr && _ctrl_xfer.stage != CONTROL_STAGE_IDLE);
     hcd_edpt_abort_xfer(rhport, daddr, ep_addr);
-    _set_control_xfer_stage(CONTROL_STAGE_IDLE); // reset control transfer state to idle
+    _control_set_xfer_stage(CONTROL_STAGE_IDLE); // reset control transfer state to idle
   } else {
     usbh_device_t* dev = get_device(daddr);
     TU_VERIFY(dev);
@@ -1321,7 +1328,9 @@ static void process_removing_device(uint8_t rhport, uint8_t hub_addr, uint8_t hu
         clear_device(dev);
 
         // abort on-going control xfer on this device if any
-        if (_ctrl_xfer.daddr == daddr) _set_control_xfer_stage(CONTROL_STAGE_IDLE);
+        if (_ctrl_xfer.daddr == daddr) {
+          _control_set_xfer_stage(CONTROL_STAGE_IDLE);
+        }
       }
     }
 

src/portable/synopsys/dwc2/hcd_dwc2.c

@@ -106,6 +106,7 @@ typedef struct {
 typedef struct {
   hcd_xfer_t xfer[DWC2_CHANNEL_COUNT_MAX];
   hcd_endpoint_t edpt[CFG_TUH_DWC2_ENDPOINT_MAX];
+  bool attach_debounce; // if true: wait for the debounce delay before issuing new attach events
 } hcd_data_t;
 
 hcd_data_t _hcd_data;
@@ -421,6 +422,11 @@ uint32_t hcd_frame_number(uint8_t rhport) {
 
 // Get the current connect status of roothub port
 bool hcd_port_connect_status(uint8_t rhport) {
+  // this is called from enum_new_device() - after the debouncing delays
+  if (_hcd_data.attach_debounce) {
+    _hcd_data.attach_debounce = false; // allow new attach events again
+  }
+
   dwc2_regs_t* dwc2 = DWC2_REG(rhport);
   return dwc2->hprt & HPRT_CONN_STATUS;
 }
@@ -1306,7 +1312,10 @@ static void handle_hprt_irq(uint8_t rhport, bool in_isr) {
     hprt |= HPRT_CONN_DETECT;
 
     if (hprt_bm.conn_status) {
-      hcd_event_device_attach(rhport, in_isr);
+      if (!_hcd_data.attach_debounce) {
+        _hcd_data.attach_debounce = true; // block new attach events until the debounce delay is over
+        hcd_event_device_attach(rhport, in_isr);
+      }
     }
   }
 
@@ -1372,8 +1381,13 @@ void hcd_int_handler(uint8_t rhport, bool in_isr) {
   if (gintsts & GINTSTS_DISCINT) {
     // Device disconnected
     dwc2->gintsts = GINTSTS_DISCINT;
-    if (!(dwc2->hprt & HPRT_CONN_STATUS)) {
-      hcd_event_device_remove(rhport, in_isr);
+
+    // ignore device removal if attach debounce is active
+    // it will evaluate the port status after the debounce delay
+    if (!_hcd_data.attach_debounce) {
+      if (!(dwc2->hprt & HPRT_CONN_STATUS)) {
+        hcd_event_device_remove(rhport, in_isr);
+      }
     }
   }