target/linux/brcm2708/patches-3.10/0084-dwc_otg-make-channel-halts-with-unknown-state-less-d.patch

   1 From e2c9f557c5bff8c839704d0627d5dd108a0e14f2 Mon Sep 17 00:00:00 2001
   2 From: P33M <P33M@github.com>
   3 Date: Tue, 23 Jul 2013 14:15:32 +0100
   4 Subject: [PATCH 084/174] dwc_otg: make channel halts with unknown state less
   5  damaging
   6
   7 If the IRQ received a channel halt interrupt through the FIQ
   8 with no other bits set, the IRQ would not release the host
   9 channel and never complete the URB.
  10
  11 Add catchall handling to treat as a transaction error and retry.
  12 ---
  13  drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c | 12 ++++++++++++
  14  1 file changed, 12 insertions(+)
  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 @@ -2578,12 +2578,24 @@ static void handle_hc_chhltd_intr_dma(dw
  19                                      DWC_READ_REG32(&hcd->
  20                                                     core_if->core_global_regs->
  21                                                     gintsts));
  22 +                               /* Failthrough: use 3-strikes rule */
  23 +                               qtd->error_count++;
  24 +                               dwc_otg_hcd_save_data_toggle(hc, hc_regs, qtd);
  25 +                               update_urb_state_xfer_intr(hc, hc_regs,
  26 +                                          qtd->urb, qtd, DWC_OTG_HC_XFER_XACT_ERR);
  27 +                               halt_channel(hcd, hc, qtd, DWC_OTG_HC_XFER_XACT_ERR);
  28                         }
  29
  30                 }
  31         } else {
  32                 DWC_PRINTF("NYET/NAK/ACK/other in non-error case, 0x%08x\n",
  33                            hcint.d32);
  34 +               /* Failthrough: use 3-strikes rule */
  35 +               qtd->error_count++;
  36 +               dwc_otg_hcd_save_data_toggle(hc, hc_regs, qtd);
  37 +               update_urb_state_xfer_intr(hc, hc_regs,
  38 +                          qtd->urb, qtd, DWC_OTG_HC_XFER_XACT_ERR);
  39 +               halt_channel(hcd, hc, qtd, DWC_OTG_HC_XFER_XACT_ERR);
  40         }
  41  }
  42