On Tue, Jul 13, 2021 at 12:36:26PM -0700, Matt Roper wrote:
Switch SKL to use a revid->stepping table as we're trying to do on all
platforms going forward. Also drop the preproduction revisions and add
the newer steppings we hadn't already handled.
Note that SKL has a case where a newer revision ID corresponds to an
older GT/disp stepping (0x9 -> STEP_J0, 0xA -> STEP_I1). Also, the lack
of a revision ID 0x8 in the table is intentional and not an oversight.
We'll re-write the KBL-specific comment to make it clear that these kind
of quirks are expected.
v2:
- Since GT and display steppings are always identical on SKL use a
macro to set both values at once in a more readable manner. (Anusha)
- Drop preproduction steppings.
Bspec: 13626
Cc: Anusha Srivatsa <anusha.srivatsa@xxxxxxxxx>
Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@xxxxxxxxx>
Reviewed-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
Lucas De Marchi
---
drivers/gpu/drm/i915/gt/intel_workarounds.c | 2 +-
drivers/gpu/drm/i915/i915_drv.h | 11 +-------
drivers/gpu/drm/i915/intel_step.c | 30 +++++++++++++++++----
drivers/gpu/drm/i915/intel_step.h | 4 +++
4 files changed, 31 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index 72562c233ad2..9f7cd2e54894 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -890,7 +890,7 @@ skl_gt_workarounds_init(struct drm_i915_private *i915, struct i915_wa_list *wal)
GEN8_EU_GAUNIT_CLOCK_GATE_DISABLE);
/* WaInPlaceDecompressionHang:skl */
- if (IS_SKL_REVID(i915, SKL_REVID_H0, REVID_FOREVER))
+ if (IS_SKL_GT_STEP(i915, STEP_H0, STEP_FOREVER))
wa_write_or(wal,
GEN9_GAMT_ECO_REG_RW_IA,
GAMT_ECO_ENABLE_IN_PLACE_DECOMPRESS);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index c4747f4407ef..f30499ed6787 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1515,16 +1515,7 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
#define IS_TGL_Y(dev_priv) \
IS_SUBPLATFORM(dev_priv, INTEL_TIGERLAKE, INTEL_SUBPLATFORM_ULX)
-#define SKL_REVID_A0 0x0
-#define SKL_REVID_B0 0x1
-#define SKL_REVID_C0 0x2
-#define SKL_REVID_D0 0x3
-#define SKL_REVID_E0 0x4
-#define SKL_REVID_F0 0x5
-#define SKL_REVID_G0 0x6
-#define SKL_REVID_H0 0x7
-
-#define IS_SKL_REVID(p, since, until) (IS_SKYLAKE(p) && IS_REVID(p, since, until))
+#define IS_SKL_GT_STEP(p, since, until) (IS_SKYLAKE(p) && IS_GT_STEP(p, since, until))
#define BXT_REVID_A0 0x0
#define BXT_REVID_A1 0x1
diff --git a/drivers/gpu/drm/i915/intel_step.c b/drivers/gpu/drm/i915/intel_step.c
index 93ccd42f2514..4e6a2b3b4f8a 100644
--- a/drivers/gpu/drm/i915/intel_step.c
+++ b/drivers/gpu/drm/i915/intel_step.c
@@ -7,14 +7,31 @@
#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.
+ * 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) },
+};
-/* FIXME: what about REVID_E0 */
static const struct intel_step_info kbl_revids[] = {
[0] = { .gt_step = STEP_A0, .display_step = STEP_A0 },
[1] = { .gt_step = STEP_B0, .display_step = STEP_B0 },
@@ -76,6 +93,9 @@ void intel_step_init(struct drm_i915_private *i915)
} 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. */
diff --git a/drivers/gpu/drm/i915/intel_step.h b/drivers/gpu/drm/i915/intel_step.h
index 958a8bb5d677..88a77159703e 100644
--- a/drivers/gpu/drm/i915/intel_step.h
+++ b/drivers/gpu/drm/i915/intel_step.h
@@ -31,6 +31,10 @@ enum intel_step {
STEP_E0,
STEP_F0,
STEP_G0,
+ STEP_H0,
+ STEP_I0,
+ STEP_I1,
+ STEP_J0,
STEP_FUTURE,
STEP_FOREVER,
};
--
2.25.4
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