drm/i915: Skip fence installation for objects with rotated views (v4)

While pinning a fb object to the display plane, only install a fence
if the object is using a normal view. This corresponds with the
behavior found in i915_gem_object_do_pin() where the fencability
criteria is determined only for objects with normal views.

v2:
Look at the object's map_and_fenceable flag to determine whether to
install a fence or not (Chris).

v3:
Pin and unpin a fence only if the current view type is normal.

v4:
Extend the "view type is normal" check for pin_fence as well.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Ville Syrjala <ville.syrjala@linux.intel.com>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1446170078-20792-1-git-send-email-vivek.kasireddy@intel.comSigned-off-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/intel_display.c

@@ -2389,6 +2389,7 @@ intel_pin_and_fence_fb_obj(struct drm_plane *plane,
 	 * framebuffer compression.  For simplicity, we always install
 	 * a fence as the cost is not that onerous.
 	 */
+	if (view.type == I915_GGTT_VIEW_NORMAL) {
 		ret = i915_gem_object_get_fence(obj);
 		if (ret == -EDEADLK) {
 			/*
@@ -2405,6 +2406,7 @@ intel_pin_and_fence_fb_obj(struct drm_plane *plane,
 			goto err_unpin;
 
 		i915_gem_object_pin_fence(obj);
+	}
 
 	dev_priv->mm.interruptible = true;
 	intel_runtime_pm_put(dev_priv);
@@ -2430,7 +2432,9 @@ static void intel_unpin_fb_obj(struct drm_framebuffer *fb,
 	ret = intel_fill_fb_ggtt_view(&view, fb, plane_state);
 	WARN_ONCE(ret, "Couldn't get view from plane state!");
 
+	if (view.type == I915_GGTT_VIEW_NORMAL)
 		i915_gem_object_unpin_fence(obj);
+
 	i915_gem_object_unpin_from_display_plane(obj, &view);
 }