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

   1 From 6ecef9d4e6add518889432cc642a50e47ee3536b 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 084/196] 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 diff --git a/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c b/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c
  17 index dbff763..488defb 100644
  18 --- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c
  19 +++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c
  20 @@ -2578,12 +2578,24 @@ static void handle_hc_chhltd_intr_dma(dwc_otg_hcd_t * hcd,
  21                                      DWC_READ_REG32(&hcd->
  22                                                     core_if->core_global_regs->
  23                                                     gintsts));
  24 +                               /* Failthrough: use 3-strikes rule */
  25 +                               qtd->error_count++;
  26 +                               dwc_otg_hcd_save_data_toggle(hc, hc_regs, qtd);
  27 +                               update_urb_state_xfer_intr(hc, hc_regs,
  28 +                                          qtd->urb, qtd, DWC_OTG_HC_XFER_XACT_ERR);
  29 +                               halt_channel(hcd, hc, qtd, DWC_OTG_HC_XFER_XACT_ERR);
  30                         }
  31
  32                 }
  33         } else {
  34                 DWC_PRINTF("NYET/NAK/ACK/other in non-error case, 0x%08x\n",
  35                            hcint.d32);
  36 +               /* Failthrough: use 3-strikes rule */
  37 +               qtd->error_count++;
  38 +               dwc_otg_hcd_save_data_toggle(hc, hc_regs, qtd);
  39 +               update_urb_state_xfer_intr(hc, hc_regs,
  40 +                          qtd->urb, qtd, DWC_OTG_HC_XFER_XACT_ERR);
  41 +               halt_channel(hcd, hc, qtd, DWC_OTG_HC_XFER_XACT_ERR);
  42         }
  43  }
  44
  45 --
  46 1.9.1
  47