[PATCH RFC v2 12/24] drm/bridge: shutdown and cleanup on bridge unplug

[Luca Ceresoli <luca.ceresoli@bootlin.com>]

With the upcoming support for DRM bridge hot(un)plugging, bridges can be
removed at any time. 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@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 2a112ed69e20..c0a2f7f1ce62 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -509,9 +509,17 @@ 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 was attached, also shutdown CRTCs 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);

-- 
2.55.0