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
10static void quirk_force_power_link(struct tb_switch *sw)
11{
12	sw->quirks |= QUIRK_FORCE_POWER_LINK_CONTROLLER;
13}
14
15static 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
23struct 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
31static 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 */
48void 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}