117 lines
3.7 KiB
C
117 lines
3.7 KiB
C
// SPDX-License-Identifier: MIT
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/*
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* Copyright © 2020,2021 Intel Corporation
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*/
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#include "i915_drv.h"
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#include "intel_step.h"
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/*
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* KBL revision ID ordering is bizarre; higher revision ID's map to lower
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* steppings in some cases. So rather than test against the revision ID
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* directly, let's map that into our own range of increasing ID's that we
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* can test against in a regular manner.
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*/
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/* FIXME: what about REVID_E0 */
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static const struct intel_step_info kbl_revids[] = {
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[0] = { .gt_step = STEP_A0, .display_step = STEP_A0 },
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[1] = { .gt_step = STEP_B0, .display_step = STEP_B0 },
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[2] = { .gt_step = STEP_C0, .display_step = STEP_B0 },
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[3] = { .gt_step = STEP_D0, .display_step = STEP_B0 },
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[4] = { .gt_step = STEP_F0, .display_step = STEP_C0 },
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[5] = { .gt_step = STEP_C0, .display_step = STEP_B1 },
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[6] = { .gt_step = STEP_D1, .display_step = STEP_B1 },
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[7] = { .gt_step = STEP_G0, .display_step = STEP_C0 },
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};
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static const struct intel_step_info tgl_uy_revid_step_tbl[] = {
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[0] = { .gt_step = STEP_A0, .display_step = STEP_A0 },
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[1] = { .gt_step = STEP_B0, .display_step = STEP_C0 },
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[2] = { .gt_step = STEP_B1, .display_step = STEP_C0 },
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[3] = { .gt_step = STEP_C0, .display_step = STEP_D0 },
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};
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/* Same GT stepping between tgl_uy_revids and tgl_revids don't mean the same HW */
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static const struct intel_step_info tgl_revid_step_tbl[] = {
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[0] = { .gt_step = STEP_A0, .display_step = STEP_B0 },
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[1] = { .gt_step = STEP_B0, .display_step = STEP_D0 },
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};
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static const struct intel_step_info adls_revid_step_tbl[] = {
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[0x0] = { .gt_step = STEP_A0, .display_step = STEP_A0 },
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[0x1] = { .gt_step = STEP_A0, .display_step = STEP_A2 },
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[0x4] = { .gt_step = STEP_B0, .display_step = STEP_B0 },
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[0x8] = { .gt_step = STEP_C0, .display_step = STEP_B0 },
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[0xC] = { .gt_step = STEP_D0, .display_step = STEP_C0 },
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};
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static const struct intel_step_info adlp_revid_step_tbl[] = {
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[0x0] = { .gt_step = STEP_A0, .display_step = STEP_A0 },
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[0x4] = { .gt_step = STEP_B0, .display_step = STEP_B0 },
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[0x8] = { .gt_step = STEP_C0, .display_step = STEP_C0 },
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[0xC] = { .gt_step = STEP_C0, .display_step = STEP_D0 },
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};
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void intel_step_init(struct drm_i915_private *i915)
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{
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const struct intel_step_info *revids = NULL;
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int size = 0;
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int revid = INTEL_REVID(i915);
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struct intel_step_info step = {};
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if (IS_ALDERLAKE_P(i915)) {
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revids = adlp_revid_step_tbl;
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size = ARRAY_SIZE(adlp_revid_step_tbl);
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} else if (IS_ALDERLAKE_S(i915)) {
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revids = adls_revid_step_tbl;
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size = ARRAY_SIZE(adls_revid_step_tbl);
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} else if (IS_TGL_U(i915) || IS_TGL_Y(i915)) {
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revids = tgl_uy_revid_step_tbl;
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size = ARRAY_SIZE(tgl_uy_revid_step_tbl);
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} else if (IS_TIGERLAKE(i915)) {
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revids = tgl_revid_step_tbl;
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size = ARRAY_SIZE(tgl_revid_step_tbl);
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} else if (IS_KABYLAKE(i915)) {
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revids = kbl_revids;
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size = ARRAY_SIZE(kbl_revids);
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}
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/* Not using the stepping scheme for the platform yet. */
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if (!revids)
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return;
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if (revid < size && revids[revid].gt_step != STEP_NONE) {
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step = revids[revid];
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} else {
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drm_warn(&i915->drm, "Unknown revid 0x%02x\n", revid);
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/*
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* If we hit a gap in the revid array, use the information for
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* the next revid.
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*
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* This may be wrong in all sorts of ways, especially if the
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* steppings in the array are not monotonically increasing, but
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* it's better than defaulting to 0.
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*/
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while (revid < size && revids[revid].gt_step == STEP_NONE)
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revid++;
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if (revid < size) {
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drm_dbg(&i915->drm, "Using steppings for revid 0x%02x\n",
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revid);
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step = revids[revid];
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} else {
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drm_dbg(&i915->drm, "Using future steppings\n");
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step.gt_step = STEP_FUTURE;
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step.display_step = STEP_FUTURE;
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}
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}
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if (drm_WARN_ON(&i915->drm, step.gt_step == STEP_NONE))
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return;
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RUNTIME_INFO(i915)->step = step;
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}
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