Subject: [PATCH 31/37] drm/bridge: panel: implement .is_tail

From: Luca Ceresoli <[email-masked]>
Date: Tue, 19 May 2026 12:37:48 +0200

This bridge is always a tail bridge, i.e. it never needs a following bridge
to complete the pipeline. Add a is_tail func to expose this.

Signed-off-by: Luca Ceresoli <[email-masked]>
---
 drivers/gpu/drm/bridge/panel.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
index 4978ec98a082..102f987b1235 100644
--- a/drivers/gpu/drm/bridge/panel.c
+++ b/drivers/gpu/drm/bridge/panel.c
@@ -58,6 +58,11 @@ static const struct drm_connector_funcs panel_bridge_connector_funcs = {
 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 };
 
+static bool panel_bridge_is_tail(struct drm_bridge *bridge)
+{
+	return true;
+}
+
 static int panel_bridge_attach(struct drm_bridge *bridge,
 			       struct drm_encoder *encoder,
 			       enum drm_bridge_attach_flags flags)
@@ -206,6 +211,7 @@ static void panel_bridge_debugfs_init(struct drm_bridge *bridge,
 }
 
 static const struct drm_bridge_funcs panel_bridge_bridge_funcs = {
+	.is_tail = panel_bridge_is_tail,
 	.attach = panel_bridge_attach,
 	.detach = panel_bridge_detach,
 	.atomic_pre_enable = panel_bridge_atomic_pre_enable,
@@ -297,7 +303,7 @@ struct drm_bridge *drm_panel_bridge_add_typed(struct drm_panel *panel,
 	panel_bridge->panel = panel;
 
 	panel_bridge->bridge.of_node = panel->dev->of_node;
-	panel_bridge->bridge.ops = DRM_BRIDGE_OP_MODES;
+	panel_bridge->bridge.ops = DRM_BRIDGE_OP_MODES | DRM_BRIDGE_OP_IS_TAIL;
 	panel_bridge->bridge.type = connector_type;
 	panel_bridge->bridge.pre_enable_prev_first = panel->prepare_prev_first;

-- 
2.54.0