drm/i915/guc: Disable send function on fini

In earlier patch 789a625 we were enabling send function only
after successful init. For completeness, we should make sure
that we disable it on fini.

v2: don't group steps by submission flag (Chris)

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170526111326.87280-2-michal.wajdeczko@intel.com

drivers/gpu/drm/i915/intel_uc.c

@@ -410,11 +410,16 @@ void intel_uc_fini_hw(struct drm_i915_private *dev_priv)
 	if (!i915.enable_guc_loading)
 		return;
 
-	if (i915.enable_guc_submission) {
+	if (i915.enable_guc_submission)
 		i915_guc_submission_disable(dev_priv);
+
+	guc_disable_communication(&dev_priv->guc);
+
+	if (i915.enable_guc_submission) {
 		gen9_disable_guc_interrupts(dev_priv);
 		i915_guc_submission_fini(dev_priv);
 	}
+
 	i915_ggtt_disable_guc(dev_priv);
 }