drm/cirrus: Introduce struct cirrus_primary_plane_state

The cirrus driver maintains plane state, format and pitch, in it's
device structure. Introduce a plane state for the primary plane to
store the values.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230215161517.5113-16-tzimmermann@suse.de

drivers/gpu/drm/tiny/cirrus.c

@@ -74,6 +74,16 @@ struct cirrus_device {
 
 #define to_cirrus(_dev) container_of(_dev, struct cirrus_device, dev)
 
+struct cirrus_primary_plane_state {
+	struct drm_shadow_plane_state base;
+};
+
+static inline struct cirrus_primary_plane_state *
+to_cirrus_primary_plane_state(struct drm_plane_state *plane_state)
+{
+	return container_of(plane_state, struct cirrus_primary_plane_state, base.base);
+};
+
 /* ------------------------------------------------------------------ */
 /*
  * The meat of this driver. The core passes us a mode and we have to program
@@ -406,11 +416,58 @@ static const struct drm_plane_helper_funcs cirrus_primary_plane_helper_funcs = {
 	.atomic_update = cirrus_primary_plane_helper_atomic_update,
 };
 
+static struct drm_plane_state *
+cirrus_primary_plane_atomic_duplicate_state(struct drm_plane *plane)
+{
+	struct drm_plane_state *plane_state = plane->state;
+	struct cirrus_primary_plane_state *new_primary_plane_state;
+	struct drm_shadow_plane_state *new_shadow_plane_state;
+
+	if (!plane_state)
+		return NULL;
+
+	new_primary_plane_state = kzalloc(sizeof(*new_primary_plane_state), GFP_KERNEL);
+	if (!new_primary_plane_state)
+		return NULL;
+	new_shadow_plane_state = &new_primary_plane_state->base;
+
+	__drm_gem_duplicate_shadow_plane_state(plane, new_shadow_plane_state);
+
+	return &new_shadow_plane_state->base;
+}
+
+static void cirrus_primary_plane_atomic_destroy_state(struct drm_plane *plane,
+						      struct drm_plane_state *plane_state)
+{
+	struct cirrus_primary_plane_state *primary_plane_state =
+		to_cirrus_primary_plane_state(plane_state);
+
+	__drm_gem_destroy_shadow_plane_state(&primary_plane_state->base);
+	kfree(primary_plane_state);
+}
+
+static void cirrus_reset_primary_plane(struct drm_plane *plane)
+{
+	struct cirrus_primary_plane_state *primary_plane_state;
+
+	if (plane->state) {
+		cirrus_primary_plane_atomic_destroy_state(plane, plane->state);
+		plane->state = NULL; /* must be set to NULL here */
+	}
+
+	primary_plane_state = kzalloc(sizeof(*primary_plane_state), GFP_KERNEL);
+	if (!primary_plane_state)
+		return;
+	__drm_gem_reset_shadow_plane(plane, &primary_plane_state->base);
+}
+
 static const struct drm_plane_funcs cirrus_primary_plane_funcs = {
 	.update_plane = drm_atomic_helper_update_plane,
 	.disable_plane = drm_atomic_helper_disable_plane,
 	.destroy = drm_plane_cleanup,
-	DRM_GEM_SHADOW_PLANE_FUNCS,
+	.reset = cirrus_reset_primary_plane,
+	.atomic_duplicate_state = cirrus_primary_plane_atomic_duplicate_state,
+	.atomic_destroy_state = cirrus_primary_plane_atomic_destroy_state,
 };
 
 static int cirrus_crtc_helper_atomic_check(struct drm_crtc *crtc, struct drm_atomic_state *state)