On pre-production hardware workload that uses push constant could cause
FIFO overflow and a hang. Disable the push constant buffer in TDL to
workaround.
Bspec: 46047
Bspec: 52890
Cc: Jordan Justen <jordan.l.justen@xxxxxxxxx>
Cc: Aditya Swarup <aditya.swarup@xxxxxxxxx>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_workarounds.c | 8 +++++++-
drivers/gpu/drm/i915/i915_reg.h | 3 +++
2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index 4e292d4bf7b9..b6fc861a8b59 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -576,6 +576,7 @@ static void tgl_ctx_workarounds_init(struct intel_engine_cs *engine,
struct i915_wa_list *wal)
{
u32 val;
+ struct drm_i915_private *i915 = engine->i915;
/* Wa_1409142259:tgl */
WA_SET_BIT_MASKED(GEN11_COMMON_SLICE_CHICKEN3,
@@ -591,8 +592,13 @@ static void tgl_ctx_workarounds_init(struct intel_engine_cs *engine,
* the read of FF_MODE2.
*/
wa_add(wal, FF_MODE2, FF_MODE2_TDS_TIMER_MASK, val,
- IS_TGL_REVID(engine->i915, TGL_REVID_A0, TGL_REVID_A0) ? 0 :
+ IS_TGL_REVID(i915, TGL_REVID_A0, TGL_REVID_A0) ? 0 :
FF_MODE2_TDS_TIMER_MASK);
+
+ /* Wa_1409085225:tgl (pre-prod) */
+ if (IS_TGL_REVID(i915, TGL_REVID_A0, TGL_REVID_A0))
+ WA_SET_BIT_MASKED(GEN9_ROW_CHICKEN4,
+ GEN12_DISABLE_TDL_PUSH_CONSTANT);
}
static void
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 6cc55c103f67..49d8407c079a 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -9141,6 +9141,9 @@ enum {
#define PUSH_CONSTANT_DEREF_DISABLE (1 << 8)
#define GEN11_TDL_CLOCK_GATING_FIX_DISABLE (1 << 1)
+#define GEN9_ROW_CHICKEN4 _MMIO(0xe48c)
+#define GEN12_DISABLE_TDL_PUSH_CONSTANT REG_BIT(9)
+
#define HSW_ROW_CHICKEN3 _MMIO(0xe49c)
#define HSW_ROW_CHICKEN3_L3_GLOBAL_ATOMICS_DISABLE (1 << 6)
--
2.20.1
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