drm/i915/cnl: Configure EU slice power gating.

Cannonlake also supports slice power gating on devices with more
than one slice as SKL. Let's assume that this is the same for SKL+
and exclude BXT only.

v2: Also remove KBL.
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1496781040-20888-7-git-send-email-rodrigo.vivi@intel.com

drivers/gpu/drm/i915/intel_device_info.c

@@ -184,16 +184,15 @@ static void gen9_sseu_info_init(struct drm_i915_private *dev_priv)
 				DIV_ROUND_UP(sseu->eu_total,
 					     sseu_subslice_total(sseu)) : 0;
 	/*
-	 * SKL supports slice power gating on devices with more than
+	 * SKL+ supports slice power gating on devices with more than
 	 * one slice, and supports EU power gating on devices with
-	 * more than one EU pair per subslice. BXT supports subslice
+	 * more than one EU pair per subslice. BXT+ supports subslice
 	 * power gating on devices with more than one subslice, and
 	 * supports EU power gating on devices with more than one EU
 	 * pair per subslice.
 	*/
 	sseu->has_slice_pg =
-		(IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv)) &&
-		hweight8(sseu->slice_mask) > 1;
+		!IS_GEN9_LP(dev_priv) && hweight8(sseu->slice_mask) > 1;
 	sseu->has_subslice_pg =
 		IS_GEN9_LP(dev_priv) && sseu_subslice_total(sseu) > 1;
 	sseu->has_eu_pg = sseu->eu_per_subslice > 2;