target/linux/bcm27xx/patches-5.4/950-0222-xhci-implement-xhci_fixup_endpoint-for-interval-adju.patch

   1 From 00e1a43b64abc8950b471678b7ed4415f3513f3e 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 | 98 +++++++++++++++++++++++++++++++++++++++++
  14  1 file changed, 98 insertions(+)
  15
  16 --- a/drivers/usb/host/xhci.c
  17 +++ b/drivers/usb/host/xhci.c
  18 @@ -1453,6 +1453,103 @@ 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 +static void xhci_fixup_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
  29 +                               struct usb_host_endpoint *ep, int interval)
  30 +{
  31 +       struct xhci_hcd *xhci;
  32 +       struct xhci_ep_ctx *ep_ctx_out, *ep_ctx_in;
  33 +       struct xhci_command *command;
  34 +       struct xhci_input_control_ctx *ctrl_ctx;
  35 +       struct xhci_virt_device *vdev;
  36 +       int xhci_interval;
  37 +       int ret;
  38 +       int ep_index;
  39 +       unsigned long flags;
  40 +       u32 ep_info_tmp;
  41 +
  42 +       xhci = hcd_to_xhci(hcd);
  43 +       ep_index = xhci_get_endpoint_index(&ep->desc);
  44 +
  45 +       /* FS/LS interval translations */
  46 +       if ((udev->speed == USB_SPEED_FULL ||
  47 +            udev->speed == USB_SPEED_LOW))
  48 +               interval *= 8;
  49 +
  50 +       mutex_lock(&xhci->mutex);
  51 +
  52 +       spin_lock_irqsave(&xhci->lock, flags);
  53 +
  54 +       vdev = xhci->devs[udev->slot_id];
  55 +       /* Get context-derived endpoint interval */
  56 +       ep_ctx_out = xhci_get_ep_ctx(xhci, vdev->out_ctx, ep_index);
  57 +       ep_ctx_in = xhci_get_ep_ctx(xhci, vdev->in_ctx, ep_index);
  58 +       xhci_interval = EP_INTERVAL_TO_UFRAMES(le32_to_cpu(ep_ctx_out->ep_info));
  59 +
  60 +       if (interval == xhci_interval) {
  61 +               spin_unlock_irqrestore(&xhci->lock, flags);
  62 +               mutex_unlock(&xhci->mutex);
  63 +               return;
  64 +       }
  65 +
  66 +       xhci_dbg(xhci, "Fixup interval=%d xhci_interval=%d\n",
  67 +                interval, xhci_interval);
  68 +       command = xhci_alloc_command_with_ctx(xhci, true, GFP_ATOMIC);
  69 +       if (!command) {
  70 +               /* Failure here is benign, poll at the original rate */
  71 +               spin_unlock_irqrestore(&xhci->lock, flags);
  72 +               mutex_unlock(&xhci->mutex);
  73 +               return;
  74 +       }
  75 +
  76 +       /* xHCI uses exponents for intervals... */
  77 +       xhci_interval = fls(interval) - 1;
  78 +       xhci_interval = clamp_val(xhci_interval, 3, 10);
  79 +       ep_info_tmp = le32_to_cpu(ep_ctx_out->ep_info);
  80 +       ep_info_tmp &= ~EP_INTERVAL(255);
  81 +       ep_info_tmp |= EP_INTERVAL(xhci_interval);
  82 +
  83 +       /* Keep the endpoint context up-to-date while issuing the command. */
  84 +       xhci_endpoint_copy(xhci, vdev->in_ctx,
  85 +                          vdev->out_ctx, ep_index);
  86 +       ep_ctx_in->ep_info = cpu_to_le32(ep_info_tmp);
  87 +
  88 +       /*
  89 +        * We need to drop the lock, so take an explicit copy
  90 +        * of the ep context.
  91 +        */
  92 +       xhci_endpoint_copy(xhci, command->in_ctx, vdev->in_ctx, ep_index);
  93 +
  94 +       ctrl_ctx = xhci_get_input_control_ctx(command->in_ctx);
  95 +       if (!ctrl_ctx) {
  96 +               xhci_warn(xhci,
  97 +                         "%s: Could not get input context, bad type.\n",
  98 +                         __func__);
  99 +               spin_unlock_irqrestore(&xhci->lock, flags);
 100 +               xhci_free_command(xhci, command);
 101 +               mutex_unlock(&xhci->mutex);
 102 +               return;
 103 +       }
 104 +       ctrl_ctx->add_flags = xhci_get_endpoint_flag_from_index(ep_index);
 105 +       ctrl_ctx->drop_flags = 0;
 106 +
 107 +       spin_unlock_irqrestore(&xhci->lock, flags);
 108 +
 109 +       ret = xhci_configure_endpoint(xhci, udev, command,
 110 +                                     false, false);
 111 +       if (ret)
 112 +               xhci_warn(xhci, "%s: Configure endpoint failed: %d\n",
 113 +                         __func__, ret);
 114 +       xhci_free_command(xhci, command);
 115 +       mutex_unlock(&xhci->mutex);
 116 +}
 117 +
 118 +/*
 119   * non-error returns are a promise to giveback() the urb later
 120   * we drop ownership so next owner (or urb unlink) can get it
 121   */
 122 @@ -5335,6 +5432,7 @@ static const struct hc_driver xhci_hc_dr
 123         .endpoint_reset =       xhci_endpoint_reset,
 124         .check_bandwidth =      xhci_check_bandwidth,
 125         .reset_bandwidth =      xhci_reset_bandwidth,
 126 +       .fixup_endpoint =       xhci_fixup_endpoint,
 127         .address_device =       xhci_address_device,
 128         .enable_device =        xhci_enable_device,
 129         .update_hub_device =    xhci_update_hub_device,