drm/imx: don't destroy mode objects manually on driver unbind

Instead let drm_mode_config_cleanup() do the work when taking down
the master device. This requires all cleanup functions to be
properly hooked up to the mode object .destroy callback.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
diff --git a/drivers/gpu/drm/imx/ipuv3-crtc.c b/drivers/gpu/drm/imx/ipuv3-crtc.c
index c3d5933..9df29f1 100644
--- a/drivers/gpu/drm/imx/ipuv3-crtc.c
+++ b/drivers/gpu/drm/imx/ipuv3-crtc.c
@@ -124,9 +124,14 @@
 	kfree(to_imx_crtc_state(state));
 }
 
+static void imx_drm_crtc_destroy(struct drm_crtc *crtc)
+{
+	imx_drm_remove_crtc(to_ipu_crtc(crtc)->imx_crtc);
+}
+
 static const struct drm_crtc_funcs ipu_crtc_funcs = {
 	.set_config = drm_atomic_helper_set_config,
-	.destroy = drm_crtc_cleanup,
+	.destroy = imx_drm_crtc_destroy,
 	.page_flip = drm_atomic_helper_page_flip,
 	.reset = imx_drm_crtc_reset,
 	.atomic_duplicate_state = imx_drm_crtc_duplicate_state,
@@ -413,8 +418,6 @@
 {
 	struct ipu_crtc *ipu_crtc = dev_get_drvdata(dev);
 
-	imx_drm_remove_crtc(ipu_crtc->imx_crtc);
-
 	ipu_put_resources(ipu_crtc);
 	if (ipu_crtc->plane[1])
 		ipu_plane_put_resources(ipu_crtc->plane[1]);