1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/gpu/drm/ast/ast_fb.c b/drivers/gpu/drm/ast/ast_fb.c
index 3e6584b940dc..81763cad9940 100644
--- a/drivers/gpu/drm/ast/ast_fb.c
+++ b/drivers/gpu/drm/ast/ast_fb.c
@@ -40,6 +40,7 @@
 #include <drm/drmP.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_fb_helper.h>
+#include <drm/drm_crtc_helper.h>
 #include "ast_drv.h"
 
 static void ast_dirty_update(struct ast_fbdev *afbdev,
@@ -314,6 +315,10 @@ int ast_fbdev_init(struct drm_device *dev)
         }
 
         drm_fb_helper_single_add_all_connectors(&afbdev->helper);
+
+        /* disable all the possible outputs/crtcs before entering KMS mode */
+        drm_helper_disable_unused_functions(dev);
+
         drm_fb_helper_initial_config(&afbdev->helper, 32);
         return 0;
 }