[PATCH 25/37] drm/bridge: shutdown and cleanup on bridge unplug

[Luca Ceresoli]

With the upcoming support for DRM bridge hot(un)plugging, bridges can be
removed at any time withotu tearing down the entire card. When this
happens, shutdown the pipeline and detach from the encoder chain the bridge
being removed along with all the following ones.

Signed-off-by: Luca Ceresoli <luca.ceresoli at bootlin.com>
---
 drivers/gpu/drm/drm_bridge.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index 7f2d1a81d730..d45fb74ec8c2 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -462,9 +462,17 @@ EXPORT_SYMBOL(devm_drm_bridge_add);
  * it won't be found by users via of_drm_find_and_get_bridge(), and add it
  * to the lingering bridge list, to keep track of it until its allocated
  * memory is eventually freed.
+ *
+ * If the bridge is attached, also disable the active output and detach
+ * this bridge and the following ones.
  */
 void drm_bridge_remove(struct drm_bridge *bridge)
 {
+	if (bridge->encoder) {
+		drm_atomic_shutdown(bridge->dev);
+		drm_encoder_cleanup_from(bridge->encoder, bridge);
+	}
+
 	mutex_lock(&bridge_lock);
 	list_move_tail(&bridge->list, &bridge_lingering_list);
 	mutex_unlock(&bridge_lock);

-- 
2.54.0