Increase Downstream's host command timeout to 5 seconds. It turns out

some flash drives can take up to 2 seconds to write a single block.

Also, reverting the previous two commits because they didn't actually
help. Aughhhhhh...

Downstream/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_hcd.c

@@ -866,7 +866,8 @@ static void HCD_HC_IN_IRQHandler(HCD_HandleTypeDef *hhcd, uint8_t chnum)
     }
     
     else if((hhcd->hc[chnum].state == HC_XACTERR) ||
-            (hhcd->hc[chnum].state == HC_DATATGLERR))
+            (hhcd->hc[chnum].state == HC_DATATGLERR) ||
+            (hhcd->hc[chnum].state == HC_NAK))
     {
       if(hhcd->hc[chnum].ErrCnt++ > 3)
       {      
@@ -899,20 +900,20 @@ static void HCD_HC_IN_IRQHandler(HCD_HandleTypeDef *hhcd, uint8_t chnum)
   else if ((USBx_HC(chnum)->HCINT) &  USB_OTG_HCINT_NAK)
   {  
       hhcd->hc[chnum].ErrCnt = 0;
-    if(hhcd->hc[chnum].ep_type == EP_TYPE_INTR)
-    {
+//    if(hhcd->hc[chnum].ep_type == EP_TYPE_INTR)
+//    {
       __HAL_HCD_UNMASK_HALT_HC_INT(chnum);
       USB_HC_Halt(hhcd->Instance, chnum);
-    }
-    else if  ((hhcd->hc[chnum].ep_type == EP_TYPE_CTRL)||
-              (hhcd->hc[chnum].ep_type == EP_TYPE_BULK))
-    {
-      /* re-activate the channel */
-      tmpreg = USBx_HC(chnum)->HCCHAR;
-      tmpreg &= ~USB_OTG_HCCHAR_CHDIS;
-      tmpreg |= USB_OTG_HCCHAR_CHENA;
-      USBx_HC(chnum)->HCCHAR = tmpreg;
-    }
+//    }
+//    else if  ((hhcd->hc[chnum].ep_type == EP_TYPE_CTRL)||
+//              (hhcd->hc[chnum].ep_type == EP_TYPE_BULK))
+//    {
+//      /* re-activate the channel */
+//      tmpreg = USBx_HC(chnum)->HCCHAR;
+//      tmpreg &= ~USB_OTG_HCCHAR_CHDIS;
+//      tmpreg |= USB_OTG_HCCHAR_CHENA;
+//      USBx_HC(chnum)->HCCHAR = tmpreg;
+//    }
     hhcd->hc[chnum].state = HC_NAK;
     __HAL_HCD_CLEAR_HC_INT(chnum, USB_OTG_HCINT_NAK);
   }
@@ -1013,13 +1014,6 @@ static void HCD_HC_OUT_IRQHandler  (HCD_HandleTypeDef *hhcd, uint8_t chnum)
   else if ((USBx_HC(chnum)->HCINT) &  USB_OTG_HCINT_CHH)
   {
     __HAL_HCD_MASK_HALT_HC_INT(chnum); 
-    
-    //This shouldn't even exist. So there's a weird host controller hardware bug
-    //on the STM32F407 that manifests when writing to some FAT filesystems.
-    //Transactions will stop partway through a 512-byte write, and nothing can
-    //get them started again. We can avoid this by soft-resetting the 
-    //AHB-interface state machines on every channel halt.
-    USBx->GRSTCTL |= USB_OTG_GRSTCTL_HSRST;
 
     if(hhcd->hc[chnum].state == HC_XFRC)
     {

Downstream/Middlewares/ST/STM32_USB_Host_Library/Class/MSC/Inc/usbh_msc.h

@@ -136,7 +136,9 @@ MSC_HandleTypeDef;
 #define USB_REQ_BOT_RESET                0xFF
 #define USB_REQ_GET_MAX_LUN              0xFE
 
-#define MSC_TIMEOUT_FRAMES_PER_BLOCK    1000
+//#define MSC_TIMEOUT_FRAMES_PER_BLOCK    1000
+#define MSC_TIMEOUT_FIXED               5000    //Some flash drives take 2 seconds to write a single block!
+
 
 /* MSC Class Codes */
 #define USB_MSC_CLASS                                   0x08

Downstream/Middlewares/ST/STM32_USB_Host_Library/Class/MSC/Src/usbh_msc.c

@@ -735,7 +735,7 @@ USBH_StatusTypeDef USBH_MSC_Read(USBH_HandleTypeDef *phost,
   MSC_Handle->unit[lun].state = MSC_READ;
   MSC_Handle->rw_lun = lun;
   MSC_Handle->RdWrCompleteCallback = callback;
-  MSC_Handle->timeout = phost->Timer + (length * MSC_TIMEOUT_FRAMES_PER_BLOCK);
+  MSC_Handle->timeout = phost->Timer + MSC_TIMEOUT_FIXED;
 
   USBH_MSC_SCSI_Read(phost,
                      lun,
@@ -776,7 +776,7 @@ USBH_StatusTypeDef USBH_MSC_Write(USBH_HandleTypeDef *phost,
   MSC_Handle->unit[lun].state = MSC_WRITE;
   MSC_Handle->rw_lun = lun;
   MSC_Handle->RdWrCompleteCallback = callback;
-  MSC_Handle->timeout = phost->Timer + (length * MSC_TIMEOUT_FRAMES_PER_BLOCK);
+  MSC_Handle->timeout = phost->Timer + MSC_TIMEOUT_FIXED;
 
   USBH_MSC_SCSI_Write(phost,
                      lun,