drm/atomic-helper: Use old/new state in drm_atomic_helper_commit_planes_on_crtc()

Update drm_atomic_helper_commit_planes_on_crtc() to use explicit old/new
states instead of relying on obj->state.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180626204144.14769-1-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/drm_atomic_helper.c

@@ -2342,11 +2342,13 @@ drm_atomic_helper_commit_planes_on_crtc(struct drm_crtc_state *old_crtc_state)
 	const struct drm_crtc_helper_funcs *crtc_funcs;
 	struct drm_crtc *crtc = old_crtc_state->crtc;
 	struct drm_atomic_state *old_state = old_crtc_state->state;
+	struct drm_crtc_state *new_crtc_state =
+		drm_atomic_get_new_crtc_state(old_state, crtc);
 	struct drm_plane *plane;
 	unsigned plane_mask;
 
 	plane_mask = old_crtc_state->plane_mask;
-	plane_mask |= crtc->state->plane_mask;
+	plane_mask |= new_crtc_state->plane_mask;
 
 	crtc_funcs = crtc->helper_private;
 	if (crtc_funcs && crtc_funcs->atomic_begin)
@@ -2355,6 +2357,8 @@ drm_atomic_helper_commit_planes_on_crtc(struct drm_crtc_state *old_crtc_state)
 	drm_for_each_plane_mask(plane, crtc->dev, plane_mask) {
 		struct drm_plane_state *old_plane_state =
 			drm_atomic_get_old_plane_state(old_state, plane);
+		struct drm_plane_state *new_plane_state =
+			drm_atomic_get_new_plane_state(old_state, plane);
 		const struct drm_plane_helper_funcs *plane_funcs;
 
 		plane_funcs = plane->helper_private;
@@ -2362,13 +2366,14 @@ drm_atomic_helper_commit_planes_on_crtc(struct drm_crtc_state *old_crtc_state)
 		if (!old_plane_state || !plane_funcs)
 			continue;
 
-		WARN_ON(plane->state->crtc && plane->state->crtc != crtc);
+		WARN_ON(new_plane_state->crtc &&
+			new_plane_state->crtc != crtc);
 
-		if (drm_atomic_plane_disabling(old_plane_state, plane->state) &&
+		if (drm_atomic_plane_disabling(old_plane_state, new_plane_state) &&
 		    plane_funcs->atomic_disable)
 			plane_funcs->atomic_disable(plane, old_plane_state);
-		else if (plane->state->crtc ||
-			 drm_atomic_plane_disabling(old_plane_state, plane->state))
+		else if (new_plane_state->crtc ||
+			 drm_atomic_plane_disabling(old_plane_state, new_plane_state))
 			plane_funcs->atomic_update(plane, old_plane_state);
 	}