target/linux/brcm2708/patches-3.10/0054-dwc_otg-add-handling-of-SPLIT-transaction-data-toggl.patch

   1 From f90755cd13b722cd3ea79bee92c29d2828b3905f Mon Sep 17 00:00:00 2001
   2 From: P33M <P33M@github.com>
   3 Date: Sun, 3 Mar 2013 14:45:53 +0000
   4 Subject: [PATCH 054/174] dwc_otg: add handling of SPLIT transaction data
   5  toggle errors
   6
   7 Previously a data toggle error on packets from a USB1.1 device behind
   8 a TT would result in the Pi locking up as the driver never handled
   9 the associated interrupt. Patch adds basic retry mechanism and
  10 interrupt acknowledgement to cater for either a chance toggle error or
  11 for devices that have a broken initial toggle state (FT8U232/FT232BM).
  12 ---
  13  drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c | 19 ++++++++++++++-----
  14  1 file changed, 14 insertions(+), 5 deletions(-)
  15
  16 --- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c
  17 +++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c
  18 @@ -1921,13 +1921,20 @@ static int32_t handle_hc_datatglerr_intr
  19                                          dwc_otg_qtd_t * qtd)
  20  {
  21         DWC_DEBUGPL(DBG_HCDI, "--Host Channel %d Interrupt: "
  22 -                   "Data Toggle Error--\n", hc->hc_num);
  23 +               "Data Toggle Error on %s transfer--\n",
  24 +               hc->hc_num, (hc->ep_is_in ? "IN" : "OUT"));
  25
  26 -       if (hc->ep_is_in) {
  27 +       /* Data toggles on split transactions cause the hc to halt.
  28 +        * restart transfer */
  29 +       if(hc->qh->do_split)
  30 +       {
  31 +               qtd->error_count++;
  32 +               dwc_otg_hcd_save_data_toggle(hc, hc_regs, qtd);
  33 +               update_urb_state_xfer_intr(hc, hc_regs,
  34 +                       qtd->urb, qtd, DWC_OTG_HC_XFER_XACT_ERR);
  35 +               halt_channel(hcd, hc, qtd, DWC_OTG_HC_XFER_XACT_ERR);
  36 +       } else if (hc->ep_is_in) {
  37                 qtd->error_count = 0;
  38 -       } else {
  39 -               DWC_ERROR("Data Toggle Error on OUT transfer,"
  40 -                         "channel %d\n", hc->hc_num);
  41         }
  42
  43         disable_hc_int(hc_regs, datatglerr);
  44 @@ -2080,6 +2087,8 @@ static void handle_hc_chhltd_intr_dma(dw
  45                 handle_hc_babble_intr(hcd, hc, hc_regs, qtd);
  46         } else if (hcint.b.frmovrun) {
  47                 handle_hc_frmovrun_intr(hcd, hc, hc_regs, qtd);
  48 +       } else if (hcint.b.datatglerr) {
  49 +               handle_hc_datatglerr_intr(hcd, hc, hc_regs, qtd);
  50         } else if (!out_nak_enh) {
  51                 if (hcint.b.nyet) {
  52                         /*