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path: root/drivers/usb/musb/musb_host.c
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Diffstat (limited to 'drivers/usb/musb/musb_host.c')
-rw-r--r--drivers/usb/musb/musb_host.c34
1 files changed, 32 insertions, 2 deletions
diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index 74c4c3698f1e..3421cf9858b5 100644
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -605,8 +605,14 @@ musb_rx_reinit(struct musb *musb, struct musb_qh *qh, struct musb_hw_ep *ep)
musb_writeb(ep->regs, MUSB_RXTYPE, qh->type_reg);
musb_writeb(ep->regs, MUSB_RXINTERVAL, qh->intv_reg);
/* NOTE: bulk combining rewrites high bits of maxpacket */
- musb_writew(ep->regs, MUSB_RXMAXP,
- qh->maxpacket | ((qh->hb_mult - 1) << 11));
+ /* Set RXMAXP with the FIFO size of the endpoint
+ * to disable double buffer mode.
+ */
+ if (musb->hwvers < MUSB_HWVERS_2000)
+ musb_writew(ep->regs, MUSB_RXMAXP, ep->max_packet_sz_rx);
+ else
+ musb_writew(ep->regs, MUSB_RXMAXP,
+ qh->maxpacket | ((qh->hb_mult - 1) << 11));
ep->rx_reinit = 0;
}
@@ -1771,6 +1777,9 @@ 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 +1818,27 @@ 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;
}