drm/imx: imx-ldb: use drm managed resources

Use drmm_simple_encoder_alloc() to align encoder memory lifetime with
the drm device. drm_encoder_cleanup() is called automatically before
the memory is freed.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/imx/imx-ldb.c

@@ -22,6 +22,7 @@
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_bridge.h>
 #include <drm/drm_fb_helper.h>
+#include <drm/drm_managed.h>
 #include <drm/drm_of.h>
 #include <drm/drm_panel.h>
 #include <drm/drm_print.h>
@@ -47,12 +48,18 @@
 #define LDB_DI1_VS_POL_ACT_LOW		(1 << 10)
 #define LDB_BGREF_RMODE_INT		(1 << 15)
 
+struct imx_ldb_channel;
+
+struct imx_ldb_encoder {
+	struct drm_connector connector;
+	struct drm_encoder encoder;
+	struct imx_ldb_channel *channel;
+};
+
 struct imx_ldb;
 
 struct imx_ldb_channel {
 	struct imx_ldb *ldb;
-	struct drm_connector connector;
-	struct drm_encoder encoder;
 
 	/* Defines what is connected to the ldb, only one at a time */
 	struct drm_panel *panel;
@@ -70,12 +77,12 @@ struct imx_ldb_channel {
 
 static inline struct imx_ldb_channel *con_to_imx_ldb_ch(struct drm_connector *c)
 {
-	return container_of(c, struct imx_ldb_channel, connector);
+	return container_of(c, struct imx_ldb_encoder, connector)->channel;
 }
 
 static inline struct imx_ldb_channel *enc_to_imx_ldb_ch(struct drm_encoder *e)
 {
-	return container_of(e, struct imx_ldb_channel, encoder);
+	return container_of(e, struct imx_ldb_encoder, encoder)->channel;
 }
 
 struct bus_mux {
@@ -411,12 +418,19 @@ static int imx_ldb_register(struct drm_device *drm,
 	struct imx_ldb_channel *imx_ldb_ch)
 {
 	struct imx_ldb *ldb = imx_ldb_ch->ldb;
-	struct drm_connector *connector = &imx_ldb_ch->connector;
-	struct drm_encoder *encoder = &imx_ldb_ch->encoder;
+	struct imx_ldb_encoder *ldb_encoder;
+	struct drm_connector *connector;
+	struct drm_encoder *encoder;
 	int ret;
 
-	memset(connector, 0, sizeof(*connector));
-	memset(encoder, 0, sizeof(*encoder));
+	ldb_encoder = drmm_simple_encoder_alloc(drm, struct imx_ldb_encoder,
+						encoder, DRM_MODE_ENCODER_LVDS);
+	if (IS_ERR(ldb_encoder))
+		return PTR_ERR(ldb_encoder);
+
+	ldb_encoder->channel = imx_ldb_ch;
+	connector = &ldb_encoder->connector;
+	encoder = &ldb_encoder->encoder;
 
 	ret = imx_drm_encoder_parse_of(drm, encoder, imx_ldb_ch->child);
 	if (ret)
@@ -433,7 +447,6 @@ static int imx_ldb_register(struct drm_device *drm,
 	}
 
 	drm_encoder_helper_add(encoder, &imx_ldb_encoder_helper_funcs);
-	drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_LVDS);
 
 	if (imx_ldb_ch->bridge) {
 		ret = drm_bridge_attach(encoder, imx_ldb_ch->bridge, NULL, 0);