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// SPDX-License-Identifier: MIT
/*
* Copyright © 2020,2021 Intel Corporation
*/
#include "i915_drv.h"
#include "intel_step.h"
/*
* KBL revision ID ordering is bizarre; higher revision ID's map to lower
* steppings in some cases. So rather than test against the revision ID
* directly, let's map that into our own range of increasing ID's that we
* can test against in a regular manner.
*/
/* FIXME: what about REVID_E0 */
static const struct i915_rev_steppings kbl_revids[] = {
[0] = { .gt_stepping = STEP_A0, .disp_stepping = STEP_A0 },
[1] = { .gt_stepping = STEP_B0, .disp_stepping = STEP_B0 },
[2] = { .gt_stepping = STEP_C0, .disp_stepping = STEP_B0 },
[3] = { .gt_stepping = STEP_D0, .disp_stepping = STEP_B0 },
[4] = { .gt_stepping = STEP_F0, .disp_stepping = STEP_C0 },
[5] = { .gt_stepping = STEP_C0, .disp_stepping = STEP_B1 },
[6] = { .gt_stepping = STEP_D1, .disp_stepping = STEP_B1 },
[7] = { .gt_stepping = STEP_G0, .disp_stepping = STEP_C0 },
};
const struct i915_rev_steppings tgl_uy_revid_step_tbl[] = {
[0] = { .gt_stepping = STEP_A0, .disp_stepping = STEP_A0 },
[1] = { .gt_stepping = STEP_B0, .disp_stepping = STEP_C0 },
[2] = { .gt_stepping = STEP_B1, .disp_stepping = STEP_C0 },
[3] = { .gt_stepping = STEP_C0, .disp_stepping = STEP_D0 },
};
/* Same GT stepping between tgl_uy_revids and tgl_revids don't mean the same HW */
const struct i915_rev_steppings tgl_revid_step_tbl[] = {
[0] = { .gt_stepping = STEP_A0, .disp_stepping = STEP_B0 },
[1] = { .gt_stepping = STEP_B0, .disp_stepping = STEP_D0 },
};
const struct i915_rev_steppings adls_revid_step_tbl[] = {
[0x0] = { .gt_stepping = STEP_A0, .disp_stepping = STEP_A0 },
[0x1] = { .gt_stepping = STEP_A0, .disp_stepping = STEP_A2 },
[0x4] = { .gt_stepping = STEP_B0, .disp_stepping = STEP_B0 },
[0x8] = { .gt_stepping = STEP_C0, .disp_stepping = STEP_B0 },
[0xC] = { .gt_stepping = STEP_D0, .disp_stepping = STEP_C0 },
};
void intel_step_init(struct drm_i915_private *i915)
{
const struct i915_rev_steppings *revids = NULL;
int size = 0;
int revid = INTEL_REVID(i915);
struct i915_rev_steppings step = {};
if (IS_KABYLAKE(i915)) {
revids = kbl_revids;
size = ARRAY_SIZE(kbl_revids);
}
/* Not using the stepping scheme for the platform yet. */
if (!revids)
return;
if (revid < size && revids[revid].gt_stepping != 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_stepping == 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_stepping = STEP_FUTURE;
step.disp_stepping = STEP_FUTURE;
}
}
if (drm_WARN_ON(&i915->drm, step.gt_stepping == STEP_NONE))
return;
RUNTIME_INFO(i915)->step = step;
}
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