[Bug 100007] [SNB][BAT] igt at gem_exec_flush@basic-batch-kernel-default-uc Failed assertion: intel_detect_and_clear_missed_interrupts(fd) == 0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100007

--- Comment #8 from Chris Wilson <chris at chris-wilson.co.uk> ---
 gen6_seqno_barrier(struct intel_engine_cs *engine)
 {
        struct drm_i915_private *dev_priv = engine->i915;
+       int loop;

        /* Workaround to force correct ordering between irq and seqno writes on
         * ivb (and maybe also on snb) by reading from a CS register (like
@@ -937,7 +938,8 @@ gen6_seqno_barrier(struct intel_engine_cs *engine)
         * take the spinlock to guard against concurrent cacheline access.
         */
        spin_lock_irq(&dev_priv->uncore.lock);
-       POSTING_READ_FW(RING_ACTHD(engine->mmio_base));
+       for (loop = 0; loop < 3; loop++)
+               POSTING_READ_FW(RING_ACTHD(engine->mmio_base));
        spin_unlock_irq(&dev_priv->uncore.lock);

was a bust.

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