drm/i915: There's no need to mask all 3D_CHICKEN bits on SNB

The need to set all of the mask bits for 3D_CHICKEN3 was required
only for pre-production hardware.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Antti Koskipää <antti.koskipaa@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index f4ac8f3..08c1a75 100644 (file)
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4696,9 +4696,8 @@ static void gen6_init_clock_gating(struct drm_device *dev)
                   GEN6_RCCUNIT_CLOCK_GATE_DISABLE);
 
        /* WaStripsFansDisableFastClipPerformanceFix:snb */
-       /* Bspec says we need to always set all mask bits. */
-       I915_WRITE(_3D_CHICKEN3, (0xFFFF << 16) |
-                  _3D_CHICKEN3_SF_DISABLE_FASTCLIP_CULL);
+       I915_WRITE(_3D_CHICKEN3,
+                  _MASKED_BIT_ENABLE(_3D_CHICKEN3_SF_DISABLE_FASTCLIP_CULL));
 
        /*
         * Bspec says: