--- zzzz-none-000/linux-2.6.39.4/drivers/gpu/drm/i915/i915_irq.c	2011-08-03 19:43:28.000000000 +0000
+++ puma6-atom-6490-729/linux-2.6.39.4/drivers/gpu/drm/i915/i915_irq.c	2021-11-10 13:38:14.000000000 +0000
@@ -1567,17 +1567,6 @@
 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 
 	I915_WRITE(HWSTAM, 0xeffe);
-	if (IS_GEN6(dev)) {
-		/* Workaround stalls observed on Sandy Bridge GPUs by
-		 * making the blitter command streamer generate a
-		 * write to the Hardware Status Page for
-		 * MI_USER_INTERRUPT.  This appears to serialize the
-		 * previous seqno write out before the interrupt
-		 * happens.
-		 */
-		I915_WRITE(GEN6_BLITTER_HWSTAM, ~GEN6_BLITTER_USER_INTERRUPT);
-		I915_WRITE(GEN6_BSD_HWSTAM, ~GEN6_BSD_USER_INTERRUPT);
-	}
 
 	/* XXX hotplug from PCH */