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linux/drivers/gpu/drm/i915/intel_step.c
José Roberto de Souza b9ef89392c drm/i915/tgl: Simply subplatform detection 
In the past we had a need to differentiate TGL U and TGL Y, there
was a different voltage swing table for each subplatform and some PCI
ids of this subplatforms are shared but it turned out that it was a
specification mistake and the voltage swing table was indeed the same
but we went ahead with that patch because we needed to differentiate
TGL U and Y from TGL H and by that time TGL H was embargoed so that
was the perfect way to land it upstream.

Now the embargo for TGL H is long past and now we even have
INTEL_TGL_12_GT1_IDS with all TGL H ids, so we can drop this PCI root
check and only rely in the PCI ids to differentiate TGL U and Y from
TGL H that actually has code differences.

Besides the simplification this will fix issues in virtualization
environments where the PCI root is virtualized and don't have the same
id as actual hardware.

v2:
- add and set INTEL_SUBPLATFORM_UY

Cc: Fred Gao <fred.gao@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Tested-by: Yu He <yu.he@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220222141424.35165-1-jose.souza@intel.com
2022-02-23 07:41:57 -08:00

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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) .graphics_step = STEP_##x, .display_step = STEP_##x, .media_step = STEP_##x
#define COMMON_GT_MEDIA_STEP(x) .graphics_step = STEP_##x, .media_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] = { COMMON_GT_MEDIA_STEP(B0), .display_step = STEP_B0 },
[2] = { COMMON_GT_MEDIA_STEP(C0), .display_step = STEP_B0 },
[3] = { COMMON_GT_MEDIA_STEP(D0), .display_step = STEP_B0 },
[4] = { COMMON_GT_MEDIA_STEP(F0), .display_step = STEP_C0 },
[5] = { COMMON_GT_MEDIA_STEP(C0), .display_step = STEP_B1 },
[6] = { COMMON_GT_MEDIA_STEP(D1), .display_step = STEP_B1 },
[7] = { COMMON_GT_MEDIA_STEP(G0), .display_step = STEP_C0 },
};
static const struct intel_step_info bxt_revids[] = {
[0xA] = { COMMON_STEP(C0) },
[0xB] = { COMMON_STEP(C0) },
[0xC] = { COMMON_STEP(D0) },
[0xD] = { COMMON_STEP(E0) },
};
static const struct intel_step_info glk_revids[] = {
[3] = { COMMON_STEP(B0) },
};
static const struct intel_step_info icl_revids[] = {
[7] = { COMMON_STEP(D0) },
};
static const struct intel_step_info jsl_ehl_revids[] = {
[0] = { COMMON_STEP(A0) },
[1] = { COMMON_STEP(B0) },
};
static const struct intel_step_info tgl_uy_revids[] = {
[0] = { COMMON_GT_MEDIA_STEP(A0), .display_step = STEP_A0 },
[1] = { COMMON_GT_MEDIA_STEP(B0), .display_step = STEP_C0 },
[2] = { COMMON_GT_MEDIA_STEP(B1), .display_step = STEP_C0 },
[3] = { COMMON_GT_MEDIA_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] = { COMMON_GT_MEDIA_STEP(A0), .display_step = STEP_B0 },
[1] = { COMMON_GT_MEDIA_STEP(B0), .display_step = STEP_D0 },
};
static const struct intel_step_info rkl_revids[] = {
[0] = { COMMON_STEP(A0) },
[1] = { COMMON_STEP(B0) },
[4] = { COMMON_STEP(C0) },
};
static const struct intel_step_info dg1_revids[] = {
[0] = { COMMON_STEP(A0) },
[1] = { COMMON_STEP(B0) },
};
static const struct intel_step_info adls_revids[] = {
[0x0] = { COMMON_GT_MEDIA_STEP(A0), .display_step = STEP_A0 },
[0x1] = { COMMON_GT_MEDIA_STEP(A0), .display_step = STEP_A2 },
[0x4] = { COMMON_GT_MEDIA_STEP(B0), .display_step = STEP_B0 },
[0x8] = { COMMON_GT_MEDIA_STEP(C0), .display_step = STEP_B0 },
[0xC] = { COMMON_GT_MEDIA_STEP(D0), .display_step = STEP_C0 },
};
static const struct intel_step_info adlp_revids[] = {
[0x0] = { COMMON_GT_MEDIA_STEP(A0), .display_step = STEP_A0 },
[0x4] = { COMMON_GT_MEDIA_STEP(B0), .display_step = STEP_B0 },
[0x8] = { COMMON_GT_MEDIA_STEP(C0), .display_step = STEP_C0 },
[0xC] = { COMMON_GT_MEDIA_STEP(C0), .display_step = STEP_D0 },
};
static const struct intel_step_info xehpsdv_revids[] = {
[0x0] = { COMMON_GT_MEDIA_STEP(A0) },
[0x1] = { COMMON_GT_MEDIA_STEP(A1) },
[0x4] = { COMMON_GT_MEDIA_STEP(B0) },
[0x8] = { COMMON_GT_MEDIA_STEP(C0) },
};
static const struct intel_step_info dg2_g10_revid_step_tbl[] = {
[0x0] = { COMMON_GT_MEDIA_STEP(A0), .display_step = STEP_A0 },
[0x1] = { COMMON_GT_MEDIA_STEP(A1), .display_step = STEP_A0 },
[0x4] = { COMMON_GT_MEDIA_STEP(B0), .display_step = STEP_B0 },
[0x8] = { COMMON_GT_MEDIA_STEP(C0), .display_step = STEP_C0 },
};
static const struct intel_step_info dg2_g11_revid_step_tbl[] = {
[0x0] = { COMMON_GT_MEDIA_STEP(A0), .display_step = STEP_B0 },
[0x4] = { COMMON_GT_MEDIA_STEP(B0), .display_step = STEP_C0 },
[0x5] = { COMMON_GT_MEDIA_STEP(B1), .display_step = STEP_C0 },
};
static const struct intel_step_info dg2_g12_revid_step_tbl[] = {
[0x0] = { COMMON_GT_MEDIA_STEP(A0), .display_step = STEP_C0 },
};
static const struct intel_step_info adls_rpls_revids[] = {
[0x4] = { COMMON_GT_MEDIA_STEP(D0), .display_step = STEP_D0 },
[0xC] = { COMMON_GT_MEDIA_STEP(D0), .display_step = STEP_C0 },
};
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_DG2_G10(i915)) {
revids = dg2_g10_revid_step_tbl;
size = ARRAY_SIZE(dg2_g10_revid_step_tbl);
} else if (IS_DG2_G11(i915)) {
revids = dg2_g11_revid_step_tbl;
size = ARRAY_SIZE(dg2_g11_revid_step_tbl);
} else if (IS_DG2_G12(i915)) {
revids = dg2_g12_revid_step_tbl;
size = ARRAY_SIZE(dg2_g12_revid_step_tbl);
} else if (IS_XEHPSDV(i915)) {
revids = xehpsdv_revids;
size = ARRAY_SIZE(xehpsdv_revids);
} else if (IS_ALDERLAKE_P(i915)) {
revids = adlp_revids;
size = ARRAY_SIZE(adlp_revids);
} else if (IS_ADLS_RPLS(i915)) {
revids = adls_rpls_revids;
size = ARRAY_SIZE(adls_rpls_revids);
} else if (IS_ALDERLAKE_S(i915)) {
revids = adls_revids;
size = ARRAY_SIZE(adls_revids);
} else if (IS_DG1(i915)) {
revids = dg1_revids;
size = ARRAY_SIZE(dg1_revids);
} else if (IS_ROCKETLAKE(i915)) {
revids = rkl_revids;
size = ARRAY_SIZE(rkl_revids);
} else if (IS_TGL_UY(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_JSL_EHL(i915)) {
revids = jsl_ehl_revids;
size = ARRAY_SIZE(jsl_ehl_revids);
} else if (IS_ICELAKE(i915)) {
revids = icl_revids;
size = ARRAY_SIZE(icl_revids);
} else if (IS_GEMINILAKE(i915)) {
revids = glk_revids;
size = ARRAY_SIZE(glk_revids);
} else if (IS_BROXTON(i915)) {
revids = bxt_revids;
size = ARRAY_SIZE(bxt_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].graphics_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].graphics_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.graphics_step = STEP_FUTURE;
step.display_step = STEP_FUTURE;
}
}
if (drm_WARN_ON(&i915->drm, step.graphics_step == STEP_NONE))
return;
RUNTIME_INFO(i915)->step = step;
}
#define STEP_NAME_CASE(name) \
case STEP_##name: \
return #name;
const char *intel_step_name(enum intel_step step)
{
switch (step) {
STEP_NAME_LIST(STEP_NAME_CASE);
default:
return "**";
}
}
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