drm/sun4i: backend: Add a custom plane state

We will need to store some additional data in the future to the state.
Create a custom plane state that will embed those data, in order to store
the pipe or whether or not that plane should use the frontend.

Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Link: https://patchwork.freedesktop.org/patch/msgid/88dd9c2b0caa550595e7b2ff37dc9d0af2c78609.1516613040.git-series.maxime.ripard@free-electrons.com

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/gpu/drm/sun4i/sun4i_layer.h b/drivers/gpu/drm/sun4i/sun4i_layer.h
index 4e84f43..d2c1934 100644
--- a/drivers/gpu/drm/sun4i/sun4i_layer.h
+++ b/drivers/gpu/drm/sun4i/sun4i_layer.h
@@ -22,12 +22,22 @@ struct sun4i_layer {
 	int			id;
 };
 
+struct sun4i_layer_state {
+	struct drm_plane_state	state;
+};
+
 static inline struct sun4i_layer *
 plane_to_sun4i_layer(struct drm_plane *plane)
 {
 	return container_of(plane, struct sun4i_layer, plane);
 }
 
+static inline struct sun4i_layer_state *
+state_to_sun4i_layer_state(struct drm_plane_state *state)
+{
+	return container_of(state, struct sun4i_layer_state, state);
+}
+
 struct drm_plane **sun4i_layers_init(struct drm_device *drm,
 				     struct sunxi_engine *engine);