drm/i915: Kill leftover GTIIR writes from valleyview_irq_preinstall()

There are two leftover GTIIR writes in valleyview_irq_preinstall().
Looks like the were originally left behind by:

 commit 2def1b01897119a75a96797ab2300bada1afd42a
 Author: Daniel Vetter <daniel.vetter@ffwll.ch>
 Date:   Fri Jul 12 22:43:25 2013 +0200

    drm/i915: unify PM interrupt preinstall sequence

and then the GTIIR reset was added back here:

 commit 5b3cd069c76bf17b8f455fc09bbb044b72333b7f
 Author: Paulo Zanoni <paulo.r.zanoni@intel.com>
 Date:   Tue Apr 1 15:37:14 2014 -0300

    drm/i915: properly clear IIR at irq_uninstall on Gen5+

so we can kill the leftovers from the vlv code.

Cc: Paulo Zanoni <przanoni@gmail.com>
Suggested-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index f2a45f14ab446b22b197865ae5eb26d007df0074..318a6a0724d041c5a6d80fda6b6faf1724595f68 100644 (file)
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -3128,10 +3128,6 @@ 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);
 
-       /* and GT */
-       I915_WRITE(GTIIR, I915_READ(GTIIR));
-       I915_WRITE(GTIIR, I915_READ(GTIIR));
-
        gen5_gt_irq_reset(dev);
 
        I915_WRITE(DPINVGTT, DPINVGTT_STATUS_MASK);