drm/i915/plane: add intel_plane_helper_add() helper

Add a small helper to keep intel_plane_helper_funcs static.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210518132426.7567-1-jani.nikula@intel.com

drivers/gpu/drm/i915/display/i9xx_plane.c

@@ -912,7 +912,7 @@ intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
 	zpos = 0;
 	drm_plane_create_zpos_immutable_property(&plane->base, zpos);
 
-	drm_plane_helper_add(&plane->base, &intel_plane_helper_funcs);
+	intel_plane_helper_add(plane);
 
 	return plane;
 

drivers/gpu/drm/i915/display/intel_atomic_plane.c

@@ -601,7 +601,12 @@ int intel_atomic_plane_check_clipping(struct intel_plane_state *plane_state,
 	return 0;
 }
 
-const struct drm_plane_helper_funcs intel_plane_helper_funcs = {
+static const struct drm_plane_helper_funcs intel_plane_helper_funcs = {
 	.prepare_fb = intel_prepare_plane_fb,
 	.cleanup_fb = intel_cleanup_plane_fb,
 };
+
+void intel_plane_helper_add(struct intel_plane *plane)
+{
+	drm_plane_helper_add(&plane->base, &intel_plane_helper_funcs);
+}

drivers/gpu/drm/i915/display/intel_atomic_plane.h

@@ -17,8 +17,6 @@ struct intel_crtc_state;
 struct intel_plane;
 struct intel_plane_state;
 
-extern const struct drm_plane_helper_funcs intel_plane_helper_funcs;
-
 unsigned int intel_adjusted_rate(const struct drm_rect *src,
 				 const struct drm_rect *dst,
 				 unsigned int rate);
@@ -65,5 +63,6 @@ int intel_atomic_plane_check_clipping(struct intel_plane_state *plane_state,
 				      bool can_position);
 void intel_plane_set_invisible(struct intel_crtc_state *crtc_state,
 			       struct intel_plane_state *plane_state);
+void intel_plane_helper_add(struct intel_plane *plane);
 
 #endif /* __INTEL_ATOMIC_PLANE_H__ */

drivers/gpu/drm/i915/display/intel_cursor.c

@@ -801,7 +801,7 @@ intel_cursor_plane_create(struct drm_i915_private *dev_priv,
 	if (DISPLAY_VER(dev_priv) >= 12)
 		drm_plane_enable_fb_damage_clips(&cursor->base);
 
-	drm_plane_helper_add(&cursor->base, &intel_plane_helper_funcs);
+	intel_plane_helper_add(cursor);
 
 	return cursor;
 

drivers/gpu/drm/i915/display/intel_sprite.c

@@ -1856,7 +1856,7 @@ intel_sprite_plane_create(struct drm_i915_private *dev_priv,
 	zpos = sprite + 1;
 	drm_plane_create_zpos_immutable_property(&plane->base, zpos);
 
-	drm_plane_helper_add(&plane->base, &intel_plane_helper_funcs);
+	intel_plane_helper_add(plane);
 
 	return plane;
 

drivers/gpu/drm/i915/display/skl_universal_plane.c

@@ -2179,7 +2179,7 @@ skl_universal_plane_create(struct drm_i915_private *dev_priv,
 						BIT(DRM_SCALING_FILTER_DEFAULT) |
 						BIT(DRM_SCALING_FILTER_NEAREST_NEIGHBOR));
 
-	drm_plane_helper_add(&plane->base, &intel_plane_helper_funcs);
+	intel_plane_helper_add(plane);
 
 	return plane;