Symbol: GTT_CACHE_EN_ALL
sys/dev/drm/i915/intel_pm.c
8916
I915_WRITE(HSW_GTT_CACHE_EN, can_use_gtt_cache ? GTT_CACHE_EN_ALL : 0);
sys/dev/drm/i915/intel_pm.c
9187
I915_WRITE(HSW_GTT_CACHE_EN, GTT_CACHE_EN_ALL);