usb: xhci: fix TDS for MTK xHCI1.1

commit 72b663a99c074a8d073e7ecdae446cfb024ef551 upstream.

For MTK's xHCI 1.0 or latter, TD size is the number of max
packet sized packets remaining in the TD, not including
this TRB (following spec).

For MTK's xHCI 0.96 and older, TD size is the number of max
packet sized packets remaining in the TD, including this TRB
(not following spec).

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 63735b5310bb17cfc2cf8f1099694bfe16fd2bb3..89a14d5f6ad885c9f19bf5613b131c29d4a1a4e5 100644 (file)
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -3132,7 +3132,7 @@ static u32 xhci_td_remainder(struct xhci_hcd *xhci, int transferred,
 {
        u32 maxp, total_packet_count;
 
-       /* MTK xHCI is mostly 0.97 but contains some features from 1.0 */
+       /* MTK xHCI 0.96 contains some features from 1.0 */
        if (xhci->hci_version < 0x100 && !(xhci->quirks & XHCI_MTK_HOST))
                return ((td_total_len - transferred) >> 10);
 
@@ -3141,8 +3141,8 @@ static u32 xhci_td_remainder(struct xhci_hcd *xhci, int transferred,
            trb_buff_len == td_total_len)
                return 0;
 
-       /* for MTK xHCI, TD size doesn't include this TRB */
-       if (xhci->quirks & XHCI_MTK_HOST)
+       /* for MTK xHCI 0.96, TD size include this TRB, but not in 1.x */
+       if ((xhci->quirks & XHCI_MTK_HOST) && (xhci->hci_version < 0x100))
                trb_buff_len = 0;
 
        maxp = GET_MAX_PACKET(usb_endpoint_maxp(&urb->ep->desc));