From b9afb9cb614d2ad44330eed03b3f577a35184a88 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Tue, 4 Dec 2012 11:14:58 +0000
Subject: [PATCH] sna/gen4: Avoid emitting URB_FENCE across a cache-line

Old erratum.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 src/sna/gen4_render.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/sna/gen4_render.c b/src/sna/gen4_render.c
index e686cad6..6b742029 100644
--- a/src/sna/gen4_render.c
+++ b/src/sna/gen4_render.c
@@ -1106,6 +1106,9 @@ gen4_emit_urb(struct sna *sna)
 	urb_cs_start = urb_sf_start + urb_sf_size;
 	urb_cs_size = URB_CS_ENTRIES * URB_CS_ENTRY_SIZE;
 
+	while ((sna->kgem.nbatch & 15) > 12)
+		OUT_BATCH(MI_NOOP);
+
 	OUT_BATCH(GEN4_URB_FENCE |
 		  UF0_CS_REALLOC |
 		  UF0_SF_REALLOC |