As with past platforms, the bspec's performance tuning guide provides
recommended MMIO settings. Although not technically "workarounds" we
apply these through the workaround framework to ensure that they're
re-applied at the proper times (e.g., on engine resets) and that any
conflicts with real workarounds are flagged.
Bspec: 72161
Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_gt_regs.h | 5 +++++
drivers/gpu/drm/i915/gt/intel_workarounds.c | 9 +++++++++
2 files changed, 14 insertions(+)
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
index 226557018037..07ef111947b8 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
@@ -981,6 +981,11 @@
#define XEHP_L3SCQREG7 _MMIO(0xb188)
#define BLEND_FILL_CACHING_OPT_DIS REG_BIT(3)
+#define XEHPC_L3SCRUB _MMIO(0xb18c)
+#define SCRUB_CL_DWNGRADE_SHARED REG_BIT(12)
+#define SCRUB_RATE_PER_BANK_MASK REG_GENMASK(2, 0)
+#define SCRUB_RATE_4B_PER_CLK REG_FIELD_PREP(SCRUB_RATE_PER_BANK_MASK, 0x6)
+
#define L3SQCREG1_CCS0 _MMIO(0xb200)
#define FLUSHALLNONCOH REG_BIT(5)
diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index 1e982ac931dc..c4af51144216 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -2679,6 +2679,15 @@ general_render_compute_wa_init(struct intel_engine_cs *engine, struct i915_wa_li
{
struct drm_i915_private *i915 = engine->i915;
+ if (IS_PONTEVECCHIO(i915)) {
+ /*
+ * The following is not actually a "workaround" but rather
+ * a recommended tuning setting documented in the bspec's
+ * performance guide section.
+ */
+ wa_write(wal, XEHPC_L3SCRUB, SCRUB_CL_DWNGRADE_SHARED | SCRUB_RATE_4B_PER_CLK);
+ }
+
if (IS_XEHPSDV(i915)) {
/* Wa_1409954639 */
wa_masked_en(wal,
--
2.35.3
