drm/simple-kms: Add plane-state helpers

Just like regular plane-state helpers, drivers can use these new
callbacks to create and destroy private plane state.

v2:
	* make duplicate_state interface compatible with
	  struct drm_plane_funcs
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Tested-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210208115538.6430-2-tzimmermann@suse.de

drivers/gpu/drm/drm_simple_kms_helper.c

@@ -253,13 +253,47 @@ static const struct drm_plane_helper_funcs drm_simple_kms_plane_helper_funcs = {
 	.atomic_update = drm_simple_kms_plane_atomic_update,
 };
 
+static void drm_simple_kms_plane_reset(struct drm_plane *plane)
+{
+	struct drm_simple_display_pipe *pipe;
+
+	pipe = container_of(plane, struct drm_simple_display_pipe, plane);
+	if (!pipe->funcs || !pipe->funcs->reset_plane)
+		return drm_atomic_helper_plane_reset(plane);
+
+	return pipe->funcs->reset_plane(pipe);
+}
+
+static struct drm_plane_state *drm_simple_kms_plane_duplicate_state(struct drm_plane *plane)
+{
+	struct drm_simple_display_pipe *pipe;
+
+	pipe = container_of(plane, struct drm_simple_display_pipe, plane);
+	if (!pipe->funcs || !pipe->funcs->duplicate_plane_state)
+		return drm_atomic_helper_plane_duplicate_state(plane);
+
+	return pipe->funcs->duplicate_plane_state(pipe);
+}
+
+static void drm_simple_kms_plane_destroy_state(struct drm_plane *plane,
+					       struct drm_plane_state *state)
+{
+	struct drm_simple_display_pipe *pipe;
+
+	pipe = container_of(plane, struct drm_simple_display_pipe, plane);
+	if (!pipe->funcs || !pipe->funcs->destroy_plane_state)
+		drm_atomic_helper_plane_destroy_state(plane, state);
+	else
+		pipe->funcs->destroy_plane_state(pipe, state);
+}
+
 static const struct drm_plane_funcs drm_simple_kms_plane_funcs = {
 	.update_plane		= drm_atomic_helper_update_plane,
 	.disable_plane		= drm_atomic_helper_disable_plane,
 	.destroy		= drm_plane_cleanup,
-	.reset			= drm_atomic_helper_plane_reset,
-	.atomic_duplicate_state	= drm_atomic_helper_plane_duplicate_state,
-	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
+	.reset			= drm_simple_kms_plane_reset,
+	.atomic_duplicate_state	= drm_simple_kms_plane_duplicate_state,
+	.atomic_destroy_state	= drm_simple_kms_plane_destroy_state,
 	.format_mod_supported   = drm_simple_kms_format_mod_supported,
 };
 

include/drm/drm_simple_kms_helper.h

@@ -149,6 +149,33 @@ struct drm_simple_display_pipe_funcs {
 	 * more details.
 	 */
 	void (*disable_vblank)(struct drm_simple_display_pipe *pipe);
+
+	/**
+	 * @reset_plane:
+	 *
+	 * Optional, called by &drm_plane_funcs.reset. Please read the
+	 * documentation for the &drm_plane_funcs.reset hook for more details.
+	 */
+	void (*reset_plane)(struct drm_simple_display_pipe *pipe);
+
+	/**
+	 * @duplicate_plane_state:
+	 *
+	 * Optional, called by &drm_plane_funcs.atomic_duplicate_state.  Please
+	 * read the documentation for the &drm_plane_funcs.atomic_duplicate_state
+	 * hook for more details.
+	 */
+	struct drm_plane_state * (*duplicate_plane_state)(struct drm_simple_display_pipe *pipe);
+
+	/**
+	 * @destroy_plane_state:
+	 *
+	 * Optional, called by &drm_plane_funcs.atomic_destroy_state.  Please
+	 * read the documentation for the &drm_plane_funcs.atomic_destroy_state
+	 * hook for more details.
+	 */
+	void (*destroy_plane_state)(struct drm_simple_display_pipe *pipe,
+				    struct drm_plane_state *plane_state);
 };
 
 /**