[PATCH 6/7] old-wa

[Chris Wilson]

---
 drivers/gpu/drm/i915/intel_ringbuffer.c | 49 ++-----------------------
 1 file changed, 3 insertions(+), 46 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index ef3c76425843..90271d4d54a6 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1518,12 +1518,6 @@ static inline int mi_set_context(struct i915_request *rq, u32 flags)
 {
 	struct drm_i915_private *i915 = rq->i915;
 	struct intel_engine_cs *engine = rq->engine;
-	enum intel_engine_id id;
-	const int num_rings =
-		/* Use an extended w/a on gen7 if signalling from other rings */
-		(HAS_LEGACY_SEMAPHORES(i915) && IS_GEN7(i915)) ?
-		INTEL_INFO(i915)->num_rings - 1 :
-		0;
 	bool force_restore = false;
 	int len;
 	u32 *cs;
@@ -1537,7 +1531,7 @@ static inline int mi_set_context(struct i915_request *rq, u32 flags)
 
 	len = 4;
 	if (IS_GEN7(i915))
-		len += 2 + (num_rings ? 4*num_rings + 6 : 0);
+		len += 2;
 	if (flags & MI_FORCE_RESTORE) {
 		GEM_BUG_ON(flags & MI_RESTORE_INHIBIT);
 		flags &= ~MI_FORCE_RESTORE;
@@ -1550,23 +1544,8 @@ static inline int mi_set_context(struct i915_request *rq, u32 flags)
 		return PTR_ERR(cs);
 
 	/* WaProgramMiArbOnOffAroundMiSetContext:ivb,vlv,hsw,bdw,chv */
-	if (IS_GEN7(i915)) {
+	if (IS_GEN7(i915))
 		*cs++ = MI_ARB_ON_OFF | MI_ARB_DISABLE;
-		if (num_rings) {
-			struct intel_engine_cs *signaller;
-
-			*cs++ = MI_LOAD_REGISTER_IMM(num_rings);
-			for_each_engine(signaller, i915, id) {
-				if (signaller == engine)
-					continue;
-
-				*cs++ = i915_mmio_reg_offset(
-					   RING_PSMI_CTL(signaller->mmio_base));
-				*cs++ = _MASKED_BIT_ENABLE(
-						GEN6_PSMI_SLEEP_MSG_DISABLE);
-			}
-		}
-	}
 
 	if (force_restore) {
 		/*
@@ -1597,30 +1576,8 @@ static inline int mi_set_context(struct i915_request *rq, u32 flags)
 	 */
 	*cs++ = MI_NOOP;
 
-	if (IS_GEN7(i915)) {
-		if (num_rings) {
-			struct intel_engine_cs *signaller;
-			i915_reg_t last_reg = {}; /* keep gcc quiet */
-
-			*cs++ = MI_LOAD_REGISTER_IMM(num_rings);
-			for_each_engine(signaller, i915, id) {
-				if (signaller == engine)
-					continue;
-
-				last_reg = RING_PSMI_CTL(signaller->mmio_base);
-				*cs++ = i915_mmio_reg_offset(last_reg);
-				*cs++ = _MASKED_BIT_DISABLE(
-						GEN6_PSMI_SLEEP_MSG_DISABLE);
-			}
-
-			/* Insert a delay before the next switch! */
-			*cs++ = MI_STORE_REGISTER_MEM | MI_SRM_LRM_GLOBAL_GTT;
-			*cs++ = i915_mmio_reg_offset(last_reg);
-			*cs++ = i915_ggtt_offset(engine->scratch);
-			*cs++ = MI_NOOP;
-		}
+	if (IS_GEN7(i915))
 		*cs++ = MI_ARB_ON_OFF | MI_ARB_ENABLE;
-	}
 
 	intel_ring_advance(rq, cs);
 
-- 
2.17.1