target/linux/brcm2708/patches-4.14/950-0135-fiq_fsm-rewind-DMA-pointer-for-OUT-transactions-that.patch

   1 From 3d0898f22d62dd7a05c39de9ea7e200689dc6c20 Mon Sep 17 00:00:00 2001
   2 From: P33M <P33M@users.noreply.github.com>
   3 Date: Fri, 24 Nov 2017 13:49:26 +0000
   4 Subject: [PATCH 135/454] fiq_fsm: rewind DMA pointer for OUT transactions that
   5  fail (#2288)
   6
   7 See: https://github.com/raspberrypi/linux/issues/2140
   8 ---
   9  drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.c | 12 ++++++++++++
  10  1 file changed, 12 insertions(+)
  11
  12 --- a/drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.c
  13 +++ b/drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.c
  14 @@ -267,6 +267,15 @@ static void notrace fiq_fsm_reload_hctsi
  15  }
  16
  17  /**
  18 + * fiq_fsm_reload_hcdma() - for OUT transactions, rewind DMA pointer
  19 + */
  20 +static void notrace fiq_fsm_reload_hcdma(struct fiq_state *st, int n)
  21 +{
  22 +       hcdma_data_t hcdma = st->channel[n].hcdma_copy;
  23 +       FIQ_WRITE(st->dwc_regs_base + HC_START + (HC_OFFSET * n) + HC_DMA, hcdma.d32);
  24 +}
  25 +
  26 +/**
  27   * fiq_iso_out_advance() - update DMA address and split position bits
  28   * for isochronous OUT transactions.
  29   *
  30 @@ -827,11 +836,14 @@ static int notrace noinline fiq_fsm_do_h
  31                         fiq_fsm_setup_csplit(state, n);
  32                 } else if (hcint.b.nak) {
  33                         // No buffer space in TT. Retry on a uframe boundary.
  34 +                       fiq_fsm_reload_hcdma(state, n);
  35                         st->fsm = FIQ_NP_SSPLIT_RETRY;
  36                         handled = 1;
  37                 } else if (hcint.b.xacterr) {
  38                         // The only other one we care about is xacterr. This implies HS bus error - retry.
  39                         st->nr_errors++;
  40 +                       if(st->hcchar_copy.b.epdir == 0)
  41 +                               fiq_fsm_reload_hcdma(state, n);
  42                         st->fsm = FIQ_NP_SSPLIT_RETRY;
  43                         if (st->nr_errors >= 3) {
  44                                 st->fsm = FIQ_NP_SPLIT_HS_ABORTED;