[PATCH v2] drm/i915/glk: Apply WaProgramL3SqcReg1DefaultForPerf for GLK too

[Valtteri Rantala]

Testing the texture read performance shows that the same tuning for
the SQ credits is needed on GLK as on BXT/APL. This has been also
confirmed by Altug from the HW team.

V2: Rebase

Signed-off-by: Valtteri Rantala <valtteri.rantala at intel.com>
---
 drivers/gpu/drm/i915/intel_engine_cs.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index fede62d..e1dcc91 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1067,6 +1067,15 @@ static int gen9_init_workarounds(struct intel_engine_cs *engine)
 	/* WaDisableSTUnitPowerOptimization:skl,bxt,kbl,glk,cfl */
 	WA_SET_BIT_MASKED(HALF_SLICE_CHICKEN2, GEN8_ST_PO_DISABLE);
 
+	/* WaProgramL3SqcReg1DefaultForPerf:bxt,glk */
+	if (IS_GEN9_LP(dev_priv)) {
+		u32 val = I915_READ(GEN8_L3SQCREG1);
+
+		val &= ~L3_PRIO_CREDITS_MASK;
+		val |= L3_GENERAL_PRIO_CREDITS(62) | L3_HIGH_PRIO_CREDITS(2);
+		I915_WRITE(GEN8_L3SQCREG1, val);
+	}
+
 	/* WaOCLCoherentLineFlush:skl,bxt,kbl,cfl */
 	I915_WRITE(GEN8_L3SQCREG4, (I915_READ(GEN8_L3SQCREG4) |
 				    GEN8_LQSC_FLUSH_COHERENT_LINES));
-- 
2.7.4