[Bug 84958] [BDW] Screen stop at certain frame when running Synmark2 cases while FPS is updating

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84958

--- Comment #11 from Chris Wilson <chris at chris-wilson.co.uk> ---
Hmm, VF instancing is the key. Apparently the command to disable instancing
with VF_SGVS is by itself insufficient:

diff --git a/src/sna/gen8_render.c b/src/sna/gen8_render.c
index 9187b38..06cb736 100644
--- a/src/sna/gen8_render.c
+++ b/src/sna/gen8_render.c
@@ -805,6 +805,7 @@ gen8_emit_cc_invariant(struct sna *sna)
 static void
 gen8_emit_vf_invariant(struct sna *sna)
 {
+       int n;
 #if 1
        OUT_BATCH(GEN8_3DSTATE_VF | (2 - 2));
        OUT_BATCH(0);
@@ -818,6 +819,12 @@ gen8_emit_vf_invariant(struct sna *sna)

        OUT_BATCH(GEN8_3DSTATE_VF_STATISTICS | 0);

+       for (n = 0; n < 33; n++) {
+               OUT_BATCH(GEN8_3DSTATE_VF_INSTANCING | (3 - 2));
+               OUT_BATCH(n);
+               OUT_BATCH(0);
+       }
+

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