git.ipfire.org Git - thirdparty/openwrt.git/blob

   1 From a956051a926b0a9e0bc587303ce1a2e153707e80 Mon Sep 17 00:00:00 2001
   2 From: Dom Cobley <popcornmix@gmail.com>
   3 Date: Mon, 31 Jul 2023 13:47:10 +0100
   4 Subject: [PATCH 0061/1085] Revert "Revert "xhci: add quirk for host
   5  controllers that don't update endpoint DCS""
   6
   7 This reverts commit 5bef4b3cb95a5b883dfec8b3ffc0d671323d55bb.
   8
   9 We don't agree with upstream revert so undo it.
  10 ---
  11  drivers/usb/host/xhci-pci.c  |  4 +++-
  12  drivers/usb/host/xhci-ring.c | 25 ++++++++++++++++++++++++-
  13  2 files changed, 27 insertions(+), 2 deletions(-)
  14
  15 --- a/drivers/usb/host/xhci-pci.c
  16 +++ b/drivers/usb/host/xhci-pci.c
  17 @@ -476,6 +476,7 @@ static void xhci_pci_quirks(struct devic
  18         if (pdev->vendor == PCI_VENDOR_ID_VIA && pdev->device == PCI_DEVICE_ID_VIA_VL805) {
  19                 xhci->quirks |= XHCI_LPM_SUPPORT;
  20                 xhci->quirks |= XHCI_TRB_OVERFETCH;
  21 +               xhci->quirks |= XHCI_EP_CTX_BROKEN_DCS;
  22         }
  23
  24         if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
  25 --- a/drivers/usb/host/xhci-ring.c
  26 +++ b/drivers/usb/host/xhci-ring.c
  27 @@ -635,8 +635,11 @@ static int xhci_move_dequeue_past_td(str
  28         struct xhci_ring *ep_ring;
  29         struct xhci_command *cmd;
  30         struct xhci_segment *new_seg;
  31 +       struct xhci_segment *halted_seg = NULL;
  32         union xhci_trb *new_deq;
  33         int new_cycle;
  34 +       union xhci_trb *halted_trb;
  35 +       int index = 0;
  36         dma_addr_t addr;
  37         u64 hw_dequeue;
  38         bool cycle_found = false;
  39 @@ -674,7 +677,27 @@ static int xhci_move_dequeue_past_td(str
  40         hw_dequeue = xhci_get_hw_deq(xhci, dev, ep_index, stream_id);
  41         new_seg = ep_ring->deq_seg;
  42         new_deq = ep_ring->dequeue;
  43 -       new_cycle = hw_dequeue & 0x1;
  44 +
  45 +       /*
  46 +        * Quirk: xHC write-back of the DCS field in the hardware dequeue
  47 +        * pointer is wrong - use the cycle state of the TRB pointed to by
  48 +        * the dequeue pointer.
  49 +        */
  50 +       if (xhci->quirks & XHCI_EP_CTX_BROKEN_DCS &&
  51 +           !(ep->ep_state & EP_HAS_STREAMS))
  52 +               halted_seg = trb_in_td(xhci, td->start_seg,
  53 +                                      td->first_trb, td->last_trb,
  54 +                                      hw_dequeue & ~0xf, false);
  55 +       if (halted_seg) {
  56 +               index = ((dma_addr_t)(hw_dequeue & ~0xf) - halted_seg->dma) /
  57 +                        sizeof(*halted_trb);
  58 +               halted_trb = &halted_seg->trbs[index];
  59 +               new_cycle = halted_trb->generic.field[3] & 0x1;
  60 +               xhci_dbg(xhci, "Endpoint DCS = %d TRB index = %d cycle = %d\n",
  61 +                        (u8)(hw_dequeue & 0x1), index, new_cycle);
  62 +       } else {
  63 +               new_cycle = hw_dequeue & 0x1;
  64 +       }
  65
  66         /*
  67          * We want to find the pointer, segment and cycle state of the new trb