@@ -207,6 +207,27 @@ void drm_encoder_cleanup(struct drm_encoder *encoder)
}
EXPORT_SYMBOL(drm_encoder_cleanup);
+/**
+ * drm_encoder_cleanup_from - remove a given bridge and all the following
+ * @encoder: encoder whole list of bridges shall be pruned
+ * @bridge: first bridge to remove
+ *
+ * Removes from an encoder all the bridges starting with a given bridge
+ * and until the end of the chain.
+ *
+ * This should not be used in "normal" DRM pipelines. It is only useful for
+ * devices whose final part of the DRM chain can be physically removed and
+ * later reconnected (possibly with different hardware).
+ */
+void drm_encoder_cleanup_from(struct drm_encoder *encoder, struct drm_bridge *bridge)
+{
+ struct drm_bridge *next;
+
+ list_for_each_entry_safe_from(bridge, next, &encoder->bridge_chain, chain_node)
+ drm_bridge_detach(bridge);
+}
+EXPORT_SYMBOL(drm_encoder_cleanup_from);
+
static void drmm_encoder_alloc_release(struct drm_device *dev, void *ptr)
{
struct drm_encoder *encoder = ptr;
@@ -320,6 +320,7 @@ static inline struct drm_encoder *drm_encoder_find(struct drm_device *dev,
}
void drm_encoder_cleanup(struct drm_encoder *encoder);
+void drm_encoder_cleanup_from(struct drm_encoder *encoder, struct drm_bridge *bridge);
/**
* drm_for_each_encoder_mask - iterate over encoders specified by bitmask
Supporting hardware whose final part of the DRM pipeline can be physically removed requires the ability to detach all bridges from a given point to the end of the pipeline. Introduce a variant of drm_encoder_cleanup() for this. Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com> --- Changes in v3: none Changed in v2: - fix a typo in a comment --- drivers/gpu/drm/drm_encoder.c | 21 +++++++++++++++++++++ include/drm/drm_encoder.h | 1 + 2 files changed, 22 insertions(+)