drm/bridge: Make (pre/post) enable/disable callbacks optional

Instead of forcing bridges to implement empty callbacks make them all
optional.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

1 files changed, 8 insertions, 4 deletions

diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index bd93453afa61..b3654404abd0 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -186,7 +186,8 @@ void drm_bridge_disable(struct drm_bridge *bridge)
 
         drm_bridge_disable(bridge->next);
 
-        bridge->funcs->disable(bridge);
+        if (bridge->funcs->disable)
+                bridge->funcs->disable(bridge);
 }
 EXPORT_SYMBOL(drm_bridge_disable);
 
@@ -206,7 +207,8 @@ void drm_bridge_post_disable(struct drm_bridge *bridge)
         if (!bridge)
                 return;
 
-        bridge->funcs->post_disable(bridge);
+        if (bridge->funcs->post_disable)
+                bridge->funcs->post_disable(bridge);
 
         drm_bridge_post_disable(bridge->next);
 }
@@ -256,7 +258,8 @@ void drm_bridge_pre_enable(struct drm_bridge *bridge)
 
         drm_bridge_pre_enable(bridge->next);
 
-        bridge->funcs->pre_enable(bridge);
+        if (bridge->funcs->pre_enable)
+                bridge->funcs->pre_enable(bridge);
 }
 EXPORT_SYMBOL(drm_bridge_pre_enable);
 
@@ -276,7 +279,8 @@ void drm_bridge_enable(struct drm_bridge *bridge)
         if (!bridge)
                 return;
 
-        bridge->funcs->enable(bridge);
+        if (bridge->funcs->enable)
+                bridge->funcs->enable(bridge);
 
         drm_bridge_enable(bridge->next);
 }