drivers/thunderbolt/quirks.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Thunderbolt driver - quirks
   4  *
   5  * Copyright (c) 2020 Mario Limonciello <mario.limonciello@dell.com>
   6  */
   7
   8 #include "tb.h"
   9
  10 static void quirk_force_power_link(struct tb_switch *sw)
  11 {
  12         sw->quirks |= QUIRK_FORCE_POWER_LINK_CONTROLLER;
  13 }
  14
  15 static void quirk_dp_credit_allocation(struct tb_switch *sw)
  16 {
  17         if (sw->credit_allocation && sw->min_dp_main_credits == 56) {
  18                 sw->min_dp_main_credits = 18;
  19                 tb_sw_dbg(sw, "quirked DP main: %u\n", sw->min_dp_main_credits);
  20         }
  21 }
  22
  23 struct tb_quirk {
  24         u16 hw_vendor_id;
  25         u16 hw_device_id;
  26         u16 vendor;
  27         u16 device;
  28         void (*hook)(struct tb_switch *sw);
  29 };
  30
  31 static const struct tb_quirk tb_quirks[] = {
  32         /* Dell WD19TB supports self-authentication on unplug */
  33         { 0x0000, 0x0000, 0x00d4, 0xb070, quirk_force_power_link },
  34         { 0x0000, 0x0000, 0x00d4, 0xb071, quirk_force_power_link },
  35         /*
  36          * Intel Goshen Ridge NVM 27 and before report wrong number of
  37          * DP buffers.
  38          */
  39         { 0x8087, 0x0b26, 0x0000, 0x0000, quirk_dp_credit_allocation },
  40 };
  41
  42 /**
  43  * tb_check_quirks() - Check for quirks to apply
  44  * @sw: Thunderbolt switch
  45  *
  46  * Apply any quirks for the Thunderbolt controller.
  47  */
  48 void tb_check_quirks(struct tb_switch *sw)
  49 {
  50         int i;
  51
  52         for (i = 0; i < ARRAY_SIZE(tb_quirks); i++) {
  53                 const struct tb_quirk *q = &tb_quirks[i];
  54
  55                 if (q->hw_vendor_id && q->hw_vendor_id != sw->config.vendor_id)
  56                         continue;
  57                 if (q->hw_device_id && q->hw_device_id != sw->config.device_id)
  58                         continue;
  59                 if (q->vendor && q->vendor != sw->vendor)
  60                         continue;
  61                 if (q->device && q->device != sw->device)
  62                         continue;
  63
  64                 q->hook(sw);
  65         }
  66 }