[Bug 52311] Flash 11.5 video hangs ivy bridge

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https://bugzilla.kernel.org/show_bug.cgi?id=52311





--- Comment #19 from Chris Wilson <chris at chris-wilson.co.uk>  2013-01-23 15:57:22 ---
(In reply to comment #17)
> Created an attachment (id=91701)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=91701) [details]
> i915_error_state from drm-fixed

Here we are supposed to be waiting for the scanline window to be outside of the
[437,438) range. It suggests that maybe IVB has a similar granularity to SNB,
maybe:

diff --git a/src/sna/sna_display.c b/src/sna/sna_display.c
index 967b88b..5eefb20 100644
--- a/src/sna/sna_display.c
+++ b/src/sna/sna_display.c
@@ -2788,6 +2788,12 @@ static bool sna_emit_wait_for_scanline_gen7(struct sna
*s
                y1 = crtc->bounds.y2;
        y2--;

+       /* The scanline granularity is 3 bits */
+       y1 &= ~7;
+       y2 &= ~7;
+       if (y2 == y1)
+               return false;
+
        b = kgem_get_batch(&sna->kgem);

        /* Both the LRI and WAIT_FOR_EVENT must be in the same cacheline */

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