1 // SPDX-License-Identifier: MIT
3 * Copyright © 2020,2021 Intel Corporation
7 #include "intel_step.h"
10 * Some platforms have unusual ways of mapping PCI revision ID to GT/display
11 * steppings. E.g., in some cases a higher PCI revision may translate to a
12 * lower stepping of the GT and/or display IP. This file provides lookup
13 * tables to map the PCI revision into a standard set of stepping values that
14 * can be compared numerically.
16 * Also note that some revisions/steppings may have been set aside as
17 * placeholders but never materialized in real hardware; in those cases there
18 * may be jumps in the revision IDs or stepping values in the tables below.
22 * Some platforms always have the same stepping value for GT and display;
23 * use a macro to define these to make it easier to identify the platforms
24 * where the two steppings can deviate.
26 #define COMMON_STEP(x) .gt_step = STEP_##x, .display_step = STEP_##x
28 static const struct intel_step_info skl_revids[] = {
29 [0x6] = { COMMON_STEP(G0) },
30 [0x7] = { COMMON_STEP(H0) },
31 [0x9] = { COMMON_STEP(J0) },
32 [0xA] = { COMMON_STEP(I1) },
35 static const struct intel_step_info kbl_revids[] = {
36 [1] = { .gt_step = STEP_B0, .display_step = STEP_B0 },
37 [2] = { .gt_step = STEP_C0, .display_step = STEP_B0 },
38 [3] = { .gt_step = STEP_D0, .display_step = STEP_B0 },
39 [4] = { .gt_step = STEP_F0, .display_step = STEP_C0 },
40 [5] = { .gt_step = STEP_C0, .display_step = STEP_B1 },
41 [6] = { .gt_step = STEP_D1, .display_step = STEP_B1 },
42 [7] = { .gt_step = STEP_G0, .display_step = STEP_C0 },
45 static const struct intel_step_info bxt_revids[] = {
46 [0xA] = { COMMON_STEP(C0) },
47 [0xB] = { COMMON_STEP(C0) },
48 [0xC] = { COMMON_STEP(D0) },
49 [0xD] = { COMMON_STEP(E0) },
52 static const struct intel_step_info glk_revids[] = {
53 [3] = { COMMON_STEP(B0) },
56 static const struct intel_step_info icl_revids[] = {
57 [7] = { COMMON_STEP(D0) },
60 static const struct intel_step_info jsl_ehl_revids[] = {
61 [0] = { COMMON_STEP(A0) },
62 [1] = { COMMON_STEP(B0) },
65 static const struct intel_step_info tgl_uy_revids[] = {
66 [0] = { .gt_step = STEP_A0, .display_step = STEP_A0 },
67 [1] = { .gt_step = STEP_B0, .display_step = STEP_C0 },
68 [2] = { .gt_step = STEP_B1, .display_step = STEP_C0 },
69 [3] = { .gt_step = STEP_C0, .display_step = STEP_D0 },
72 /* Same GT stepping between tgl_uy_revids and tgl_revids don't mean the same HW */
73 static const struct intel_step_info tgl_revids[] = {
74 [0] = { .gt_step = STEP_A0, .display_step = STEP_B0 },
75 [1] = { .gt_step = STEP_B0, .display_step = STEP_D0 },
78 static const struct intel_step_info adls_revids[] = {
79 [0x0] = { .gt_step = STEP_A0, .display_step = STEP_A0 },
80 [0x1] = { .gt_step = STEP_A0, .display_step = STEP_A2 },
81 [0x4] = { .gt_step = STEP_B0, .display_step = STEP_B0 },
82 [0x8] = { .gt_step = STEP_C0, .display_step = STEP_B0 },
83 [0xC] = { .gt_step = STEP_D0, .display_step = STEP_C0 },
86 static const struct intel_step_info adlp_revids[] = {
87 [0x0] = { .gt_step = STEP_A0, .display_step = STEP_A0 },
88 [0x4] = { .gt_step = STEP_B0, .display_step = STEP_B0 },
89 [0x8] = { .gt_step = STEP_C0, .display_step = STEP_C0 },
90 [0xC] = { .gt_step = STEP_C0, .display_step = STEP_D0 },
93 void intel_step_init(struct drm_i915_private *i915)
95 const struct intel_step_info *revids = NULL;
97 int revid = INTEL_REVID(i915);
98 struct intel_step_info step = {};
100 if (IS_ALDERLAKE_P(i915)) {
101 revids = adlp_revids;
102 size = ARRAY_SIZE(adlp_revids);
103 } else if (IS_ALDERLAKE_S(i915)) {
104 revids = adls_revids;
105 size = ARRAY_SIZE(adls_revids);
106 } else if (IS_TGL_U(i915) || IS_TGL_Y(i915)) {
107 revids = tgl_uy_revids;
108 size = ARRAY_SIZE(tgl_uy_revids);
109 } else if (IS_TIGERLAKE(i915)) {
111 size = ARRAY_SIZE(tgl_revids);
112 } else if (IS_JSL_EHL(i915)) {
113 revids = jsl_ehl_revids;
114 size = ARRAY_SIZE(jsl_ehl_revids);
115 } else if (IS_ICELAKE(i915)) {
117 size = ARRAY_SIZE(icl_revids);
118 } else if (IS_GEMINILAKE(i915)) {
120 size = ARRAY_SIZE(glk_revids);
121 } else if (IS_BROXTON(i915)) {
123 size = ARRAY_SIZE(bxt_revids);
124 } else if (IS_KABYLAKE(i915)) {
126 size = ARRAY_SIZE(kbl_revids);
127 } else if (IS_SKYLAKE(i915)) {
129 size = ARRAY_SIZE(skl_revids);
132 /* Not using the stepping scheme for the platform yet. */
136 if (revid < size && revids[revid].gt_step != STEP_NONE) {
137 step = revids[revid];
139 drm_warn(&i915->drm, "Unknown revid 0x%02x\n", revid);
142 * If we hit a gap in the revid array, use the information for
145 * This may be wrong in all sorts of ways, especially if the
146 * steppings in the array are not monotonically increasing, but
147 * it's better than defaulting to 0.
149 while (revid < size && revids[revid].gt_step == STEP_NONE)
153 drm_dbg(&i915->drm, "Using steppings for revid 0x%02x\n",
155 step = revids[revid];
157 drm_dbg(&i915->drm, "Using future steppings\n");
158 step.gt_step = STEP_FUTURE;
159 step.display_step = STEP_FUTURE;
163 if (drm_WARN_ON(&i915->drm, step.gt_step == STEP_NONE))
166 RUNTIME_INFO(i915)->step = step;