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@@ -1740,6 +1740,16 @@ void ironlake_irq_preinstall(struct drm_device *dev)
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INIT_WORK(&dev_priv->rps_work, gen6_pm_rps_work);
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I915_WRITE(HWSTAM, 0xeffe);
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+ if (IS_GEN6(dev)) {
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+ /* Workaround stalls observed on Sandy Bridge GPUs by
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+ * making the blitter command streamer generate a
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+ * write to the Hardware Status Page for
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+ * MI_USER_INTERRUPT. This appears to serialize the
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+ * previous seqno write out before the interrupt
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+ * happens.
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+ */
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+ I915_WRITE(GEN6_BLITTER_HWSTAM, ~GEN6_BLITTER_USER_INTERRUPT);
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+ }
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/* XXX hotplug from PCH */
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Linus Torvalds