Fix for occasional problem when attaching mouse after powerup.

It turned out we were getting a "device disconnected" interrupt while
waiting for the port to enable following reset. Simply ignoring the
disconnect interrupt allows everything to work! WTF...

Downstream/Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_hcd.h

@@ -197,7 +197,7 @@ void                HAL_HCD_IRQHandler(HCD_HandleTypeDef *hhcd);
 void                HAL_HCD_SOF_Callback(HCD_HandleTypeDef *hhcd);
 void                HAL_HCD_Connect_Callback(HCD_HandleTypeDef *hhcd);
 void                HAL_HCD_PortEnabled_Callback(HCD_HandleTypeDef *hhcd);
-void                HAL_HCD_Disconnect_Callback(HCD_HandleTypeDef *hhcd);
+HAL_StatusTypeDef   HAL_HCD_Disconnect_Callback(HCD_HandleTypeDef *hhcd);
 void                HAL_HCD_HC_NotifyURBChange_Callback(HCD_HandleTypeDef *hhcd, 
                                                         uint8_t chnum, 
                                                         HCD_URBStateTypeDef urb_state);

Downstream/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_hcd.c

@@ -477,14 +477,14 @@ void HAL_HCD_IRQHandler(HCD_HandleTypeDef *hhcd)
     /* Handle Host Disconnect Interrupts */
     if(__HAL_HCD_GET_FLAG(hhcd, USB_OTG_GINTSTS_DISCINT))
     {
-      
-      /* Cleanup HPRT */
-      USBx_HPRT0 &= ~(USB_OTG_HPRT_PENA | USB_OTG_HPRT_PCDET |\
-        USB_OTG_HPRT_PENCHNG | USB_OTG_HPRT_POCCHNG );
-      
       /* Handle Host Port Interrupts */
-      HAL_HCD_Disconnect_Callback(hhcd);
+      if (HAL_HCD_Disconnect_Callback(hhcd) == HAL_OK)
-      USB_InitFSLSPClkSel(hhcd->Instance ,HCFG_48_MHZ );
+      {
+          /* Cleanup HPRT */
+          USBx_HPRT0 &= ~(USB_OTG_HPRT_PENA | USB_OTG_HPRT_PCDET |\
+            USB_OTG_HPRT_PENCHNG | USB_OTG_HPRT_POCCHNG );
+          USB_InitFSLSPClkSel(hhcd->Instance ,HCFG_48_MHZ );
+      }
       __HAL_HCD_CLEAR_FLAG(hhcd, USB_OTG_GINTSTS_DISCINT);
     }
     
@@ -636,7 +636,7 @@ __weak void HAL_HCD_PortEnabled_Callback(HCD_HandleTypeDef *hhcd)
   * @param  hhcd: HCD handle
   * @retval None
   */
-__weak void HAL_HCD_Disconnect_Callback(HCD_HandleTypeDef *hhcd)
+__weak HAL_StatusTypeDef HAL_HCD_Disconnect_Callback(HCD_HandleTypeDef *hhcd)
 {
   /* NOTE : This function Should not be modified, when the callback is needed,
             the HAL_HCD_Disconnect_Callback could be implemented in the user file

Downstream/Middlewares/ST/STM32_USB_Host_Library/Core/Src/usbh_core.c

@@ -871,6 +871,13 @@ USBH_StatusTypeDef  USBH_LL_PortEnabled (USBH_HandleTypeDef *phost)
   */
 USBH_StatusTypeDef  USBH_LL_Disconnect  (USBH_HandleTypeDef *phost)
 {
+  //Ignore false disconnect interrupt that sometimes intrudes
+  //while we are waiting for the port to enable :(
+  if (phost->gState == HOST_DEV_WAIT_FOR_ATTACHMENT)
+  {
+      return USBH_FAIL;
+  }
+
   /*Stop Host */ 
   USBH_LL_Stop(phost);  
   

Downstream/Src/usbh_config.c

@@ -124,9 +124,13 @@ void HAL_HCD_PortEnabled_Callback(HCD_HandleTypeDef *hhcd)
   * @param  hhcd: HCD handle
   * @retval None
   */
-void HAL_HCD_Disconnect_Callback(HCD_HandleTypeDef *hhcd)
+HAL_StatusTypeDef HAL_HCD_Disconnect_Callback(HCD_HandleTypeDef *hhcd)
 {
-  USBH_LL_Disconnect(hhcd->pData);
+  if (USBH_LL_Disconnect(hhcd->pData) == USBH_OK)
+  {
+      return HAL_OK;
+  }
+  return HAL_ERROR;
 } 
 
 /**