[PATCH] drm/i915/bdw: Fix GEN8 GTT size calculation

[Ben Widawsky <benjamin.widawsky@intel.com>]

The preliminary HW support check is no longer needed, and the
calculation is simplified while here.

Reported-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 40a2b36..694112a 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -1250,14 +1250,7 @@ static inline unsigned int gen8_get_total_gtt_size(u16 bdw_gmch_ctl)
 {
 	bdw_gmch_ctl >>= BDW_GMCH_GGMS_SHIFT;
 	bdw_gmch_ctl &= BDW_GMCH_GGMS_MASK;
-	if (bdw_gmch_ctl)
-		bdw_gmch_ctl = 1 << bdw_gmch_ctl;
-	if (bdw_gmch_ctl > 4) {
-		WARN_ON(!i915_preliminary_hw_support);
-		return 4<<20;
-	}
-
-	return bdw_gmch_ctl << 20;
+	return 1 << (bdw_gmch_ctl + 20);
 }
 
 static inline size_t gen6_get_stolen_size(u16 snb_gmch_ctl)
-- 
1.9.0