git.openwrt.org Git - openwrt/staging/dangole.git/blob

   1 From e9263b01e122059a6a8ba1aeed8ed7a56cf80028 Mon Sep 17 00:00:00 2001
   2 From: Jonathan Bell <jonathan@raspberrypi.org>
   3 Date: Tue, 11 Jun 2019 11:33:39 +0100
   4 Subject: [PATCH] xhci: implement xhci_fixup_endpoint for interval
   5  adjustments
   6
   7 Must be called in a non-atomic context, after the endpoint
   8 has been registered with the hardware via xhci_add_endpoint
   9 and before the first URB is submitted for the endpoint.
  10
  11 Signed-off-by: Jonathan Bell <jonathan@raspberrypi.org>
  12 ---
  13  drivers/usb/host/xhci.c | 104 ++++++++++++++++++++++++++++++++++++++++
  14  1 file changed, 104 insertions(+)
  15
  16 --- a/drivers/usb/host/xhci.c
  17 +++ b/drivers/usb/host/xhci.c
  18 @@ -1618,6 +1618,109 @@ command_cleanup:
  19  }
  20
  21  /*
  22 + * RPI: Fixup endpoint intervals when requested
  23 + * - Check interval versus the (cached) endpoint context
  24 + * - set the endpoint interval to the new value
  25 + * - force an endpoint configure command
  26 + * XXX: bandwidth is not recalculated. We should probably do that.
  27 + */
  28 +
  29 +static unsigned int xhci_get_endpoint_flag_from_index(unsigned int ep_index)
  30 +{
  31 +       return 1 << (ep_index + 1);
  32 +}
  33 +
  34 +static void xhci_fixup_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
  35 +                               struct usb_host_endpoint *ep, int interval)
  36 +{
  37 +       struct xhci_hcd *xhci;
  38 +       struct xhci_ep_ctx *ep_ctx_out, *ep_ctx_in;
  39 +       struct xhci_command *command;
  40 +       struct xhci_input_control_ctx *ctrl_ctx;
  41 +       struct xhci_virt_device *vdev;
  42 +       int xhci_interval;
  43 +       int ret;
  44 +       int ep_index;
  45 +       unsigned long flags;
  46 +       u32 ep_info_tmp;
  47 +
  48 +       xhci = hcd_to_xhci(hcd);
  49 +       ep_index = xhci_get_endpoint_index(&ep->desc);
  50 +
  51 +       /* FS/LS interval translations */
  52 +       if ((udev->speed == USB_SPEED_FULL ||
  53 +            udev->speed == USB_SPEED_LOW))
  54 +               interval *= 8;
  55 +
  56 +       mutex_lock(&xhci->mutex);
  57 +
  58 +       spin_lock_irqsave(&xhci->lock, flags);
  59 +
  60 +       vdev = xhci->devs[udev->slot_id];
  61 +       /* Get context-derived endpoint interval */
  62 +       ep_ctx_out = xhci_get_ep_ctx(xhci, vdev->out_ctx, ep_index);
  63 +       ep_ctx_in = xhci_get_ep_ctx(xhci, vdev->in_ctx, ep_index);
  64 +       xhci_interval = EP_INTERVAL_TO_UFRAMES(le32_to_cpu(ep_ctx_out->ep_info));
  65 +
  66 +       if (interval == xhci_interval) {
  67 +               spin_unlock_irqrestore(&xhci->lock, flags);
  68 +               mutex_unlock(&xhci->mutex);
  69 +               return;
  70 +       }
  71 +
  72 +       xhci_dbg(xhci, "Fixup interval=%d xhci_interval=%d\n",
  73 +                interval, xhci_interval);
  74 +       command = xhci_alloc_command_with_ctx(xhci, true, GFP_ATOMIC);
  75 +       if (!command) {
  76 +               /* Failure here is benign, poll at the original rate */
  77 +               spin_unlock_irqrestore(&xhci->lock, flags);
  78 +               mutex_unlock(&xhci->mutex);
  79 +               return;
  80 +       }
  81 +
  82 +       /* xHCI uses exponents for intervals... */
  83 +       xhci_interval = fls(interval) - 1;
  84 +       xhci_interval = clamp_val(xhci_interval, 3, 10);
  85 +       ep_info_tmp = le32_to_cpu(ep_ctx_out->ep_info);
  86 +       ep_info_tmp &= ~EP_INTERVAL(255);
  87 +       ep_info_tmp |= EP_INTERVAL(xhci_interval);
  88 +
  89 +       /* Keep the endpoint context up-to-date while issuing the command. */
  90 +       xhci_endpoint_copy(xhci, vdev->in_ctx,
  91 +                          vdev->out_ctx, ep_index);
  92 +       ep_ctx_in->ep_info = cpu_to_le32(ep_info_tmp);
  93 +
  94 +       /*
  95 +        * We need to drop the lock, so take an explicit copy
  96 +        * of the ep context.
  97 +        */
  98 +       xhci_endpoint_copy(xhci, command->in_ctx, vdev->in_ctx, ep_index);
  99 +
 100 +       ctrl_ctx = xhci_get_input_control_ctx(command->in_ctx);
 101 +       if (!ctrl_ctx) {
 102 +               xhci_warn(xhci,
 103 +                         "%s: Could not get input context, bad type.\n",
 104 +                         __func__);
 105 +               spin_unlock_irqrestore(&xhci->lock, flags);
 106 +               xhci_free_command(xhci, command);
 107 +               mutex_unlock(&xhci->mutex);
 108 +               return;
 109 +       }
 110 +       ctrl_ctx->add_flags = xhci_get_endpoint_flag_from_index(ep_index);
 111 +       ctrl_ctx->drop_flags = 0;
 112 +
 113 +       spin_unlock_irqrestore(&xhci->lock, flags);
 114 +
 115 +       ret = xhci_configure_endpoint(xhci, udev, command,
 116 +                                     false, false);
 117 +       if (ret)
 118 +               xhci_warn(xhci, "%s: Configure endpoint failed: %d\n",
 119 +                         __func__, ret);
 120 +       xhci_free_command(xhci, command);
 121 +       mutex_unlock(&xhci->mutex);
 122 +}
 123 +
 124 +/*
 125   * non-error returns are a promise to giveback() the urb later
 126   * we drop ownership so next owner (or urb unlink) can get it
 127   */
 128 @@ -5457,6 +5560,7 @@ static const struct hc_driver xhci_hc_dr
 129         .endpoint_reset =       xhci_endpoint_reset,
 130         .check_bandwidth =      xhci_check_bandwidth,
 131         .reset_bandwidth =      xhci_reset_bandwidth,
 132 +       .fixup_endpoint =       xhci_fixup_endpoint,
 133         .address_device =       xhci_address_device,
 134         .enable_device =        xhci_enable_device,
 135         .update_hub_device =    xhci_update_hub_device,