1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index 74c4c3698f1e..c3fdd6d69f5e 100644
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -1771,6 +1771,9 @@ static int musb_schedule(
         int                     best_end, epnum;
         struct musb_hw_ep       *hw_ep = NULL;
         struct list_head        *head = NULL;
+        u8                      toggle;
+        u8                      txtype;
+        struct urb              *urb = next_urb(qh);
 
         /* use fixed hardware for control and bulk */
         if (qh->type == USB_ENDPOINT_XFER_CONTROL) {
@@ -1809,6 +1812,27 @@ static int musb_schedule(
                 diff -= (qh->maxpacket * qh->hb_mult);
 
                 if (diff >= 0 && best_diff > diff) {
+
+                        /*
+                         * Mentor controller has a bug in that if we schedule
+                         * a BULK Tx transfer on an endpoint that had earlier
+                         * handled ISOC then the BULK transfer has to start on
+                         * a zero toggle.  If the BULK transfer starts on a 1
+                         * toggle then this transfer will fail as the mentor
+                         * controller starts the Bulk transfer on a 0 toggle
+                         * irrespective of the programming of the toggle bits
+                         * in the TXCSR register.  Check for this condition
+                         * while allocating the EP for a Tx Bulk transfer.  If
+                         * so skip this EP.
+                         */
+                        hw_ep = musb->endpoints + epnum;
+                        toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in);
+                        txtype = (musb_readb(hw_ep->regs, MUSB_TXTYPE)
+                                        >> 4) & 0x3;
+                        if (!is_in && (qh->type == USB_ENDPOINT_XFER_BULK) &&
+                                toggle && (txtype == USB_ENDPOINT_XFER_ISOC))
+                                continue;
+
                         best_diff = diff;
                         best_end = epnum;
                 }