drm/i915: rip out old HWSTAM missed irq WA for vlv

This got copy-pasted from an older version. The newer kinds of
workarounds don't need this anymore.

Shame on me for not noticing when picking up the vlv irq patch.

Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 0 insertions, 12 deletions

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 06286a270b07..8496fa55122a 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1998,18 +1998,6 @@ static void valleyview_irq_preinstall(struct drm_device *dev)
         I915_WRITE(RING_IMR(GEN6_BSD_RING_BASE), 0);
         I915_WRITE(RING_IMR(BLT_RING_BASE), 0);
 
-        if (IS_GEN6(dev) || IS_GEN7(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);
-        }
-
         /* and GT */
         I915_WRITE(GTIIR, I915_READ(GTIIR));
         I915_WRITE(GTIIR, I915_READ(GTIIR));