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// SPDX-License-Identifier: MIT
/*
* Copyright © 2020,2021 Intel Corporation
*/
#include "i915_drv.h"
#include "intel_step.h"
/*
* Some platforms have unusual ways of mapping PCI revision ID to GT/display
* steppings. E.g., in some cases a higher PCI revision may translate to a
* lower stepping of the GT and/or display IP. This file provides lookup
* tables to map the PCI revision into a standard set of stepping values that
* can be compared numerically.
*
* Also note that some revisions/steppings may have been set aside as
* placeholders but never materialized in real hardware; in those cases there
* may be jumps in the revision IDs or stepping values in the tables below.
*/
/*
* Some platforms always have the same stepping value for GT and display;
* use a macro to define these to make it easier to identify the platforms
* where the two steppings can deviate.
*/
#define COMMON_STEP(x) .gt_step = STEP_##x, .display_step = STEP_##x
static const struct intel_step_info skl_revids[] = {
[0x6] = { COMMON_STEP(G0) },
[0x7] = { COMMON_STEP(H0) },
[0x9] = { COMMON_STEP(J0) },
[0xA] = { COMMON_STEP(I1) },
};
static const struct intel_step_info kbl_revids[] = {
[1] = { .gt_step = STEP_B0, .display_step = STEP_B0 },
[2] = { .gt_step = STEP_C0, .display_step = STEP_B0 },
[3] = { .gt_step = STEP_D0, .display_step = STEP_B0 },
[4] = { .gt_step = STEP_F0, .display_step = STEP_C0 },
[5] = { .gt_step = STEP_C0, .display_step = STEP_B1 },
[6] = { .gt_step = STEP_D1, .display_step = STEP_B1 },
[7] = { .gt_step = STEP_G0, .display_step = STEP_C0 },
};
static const struct intel_step_info tgl_uy_revids[] = {
[0] = { .gt_step = STEP_A0, .display_step = STEP_A0 },
[1] = { .gt_step = STEP_B0, .display_step = STEP_C0 },
[2] = { .gt_step = STEP_B1, .display_step = STEP_C0 },
[3] = { .gt_step = STEP_C0, .display_step = STEP_D0 },
};
/* Same GT stepping between tgl_uy_revids and tgl_revids don't mean the same HW */
static const struct intel_step_info tgl_revids[] = {
[0] = { .gt_step = STEP_A0, .display_step = STEP_B0 },
[1] = { .gt_step = STEP_B0, .display_step = STEP_D0 },
};
static const struct intel_step_info adls_revids[] = {
[0x0] = { .gt_step = STEP_A0, .display_step = STEP_A0 },
[0x1] = { .gt_step = STEP_A0, .display_step = STEP_A2 },
[0x4] = { .gt_step = STEP_B0, .display_step = STEP_B0 },
[0x8] = { .gt_step = STEP_C0, .display_step = STEP_B0 },
[0xC] = { .gt_step = STEP_D0, .display_step = STEP_C0 },
};
static const struct intel_step_info adlp_revids[] = {
[0x0] = { .gt_step = STEP_A0, .display_step = STEP_A0 },
[0x4] = { .gt_step = STEP_B0, .display_step = STEP_B0 },
[0x8] = { .gt_step = STEP_C0, .display_step = STEP_C0 },
[0xC] = { .gt_step = STEP_C0, .display_step = STEP_D0 },
};
void intel_step_init(struct drm_i915_private *i915)
{
const struct intel_step_info *revids = NULL;
int size = 0;
int revid = INTEL_REVID(i915);
struct intel_step_info step = {};
if (IS_ALDERLAKE_P(i915)) {
revids = adlp_revids;
size = ARRAY_SIZE(adlp_revids);
} else if (IS_ALDERLAKE_S(i915)) {
revids = adls_revids;
size = ARRAY_SIZE(adls_revids);
} else if (IS_TGL_U(i915) || IS_TGL_Y(i915)) {
revids = tgl_uy_revids;
size = ARRAY_SIZE(tgl_uy_revids);
} else if (IS_TIGERLAKE(i915)) {
revids = tgl_revids;
size = ARRAY_SIZE(tgl_revids);
} else if (IS_KABYLAKE(i915)) {
revids = kbl_revids;
size = ARRAY_SIZE(kbl_revids);
} else if (IS_SKYLAKE(i915)) {
revids = skl_revids;
size = ARRAY_SIZE(skl_revids);
}
/* Not using the stepping scheme for the platform yet. */
if (!revids)
return;
if (revid < size && revids[revid].gt_step != STEP_NONE) {
step = revids[revid];
} else {
drm_warn(&i915->drm, "Unknown revid 0x%02x\n", revid);
/*
* If we hit a gap in the revid array, use the information for
* the next revid.
*
* This may be wrong in all sorts of ways, especially if the
* steppings in the array are not monotonically increasing, but
* it's better than defaulting to 0.
*/
while (revid < size && revids[revid].gt_step == STEP_NONE)
revid++;
if (revid < size) {
drm_dbg(&i915->drm, "Using steppings for revid 0x%02x\n",
revid);
step = revids[revid];
} else {
drm_dbg(&i915->drm, "Using future steppings\n");
step.gt_step = STEP_FUTURE;
step.display_step = STEP_FUTURE;
}
}
if (drm_WARN_ON(&i915->drm, step.gt_step == STEP_NONE))
return;
RUNTIME_INFO(i915)->step = step;
}
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