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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - [snb] vsync hang"
href="https://bugs.freedesktop.org/show_bug.cgi?id=68718#c20">Comment # 20</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - [snb] vsync hang"
href="https://bugs.freedesktop.org/show_bug.cgi?id=68718">bug 68718</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>Guessing now, but maybe try this delta patch on top:
diff --git a/src/sna/sna_display.c b/src/sna/sna_display.c
index 99afbd1..2620669 100644
--- a/src/sna/sna_display.c
+++ b/src/sna/sna_display.c
@@ -3984,7 +3984,7 @@ static bool sna_emit_wait_for_scanline_gen6(struct sna
*sna,
b = kgem_get_batch(&sna->kgem);
/* Both the LRI and WAIT_FOR_EVENT must be in the same cacheline */
- if (((sna->kgem.nbatch + 6) >> 4) != (sna->kgem.nbatch + 9) >> 4) {
+ if (((sna->kgem.nbatch + 6) >> 3) != (sna->kgem.nbatch + 10) >> 3) {
int dw = sna->kgem.nbatch + 6;
dw = ALIGN(dw, 16) - dw;
while (dw--)
I think the cacheline it mentions is 64bytes, but we may as check against
32bytes just in case.</pre>
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