Some code needing to know whether a bridge is the last in a chain currently
call drm_bridge_get_next_bridge(). However drm_bridge_get_next_bridge()
will soon increment the refcount of the returned bridge, which would make
such code more annoying to write.
In preparation for drm_bridge_get_next_bridge() to increment the refcount,
as well as to simplify such code, introduce a simple bool function to tell
whether a bridge is the last in the chain.
Reviewed-by: Maxime Ripard <mrip...@kernel.org>
Signed-off-by: Luca Ceresoli <luca.ceres...@bootlin.com>
---
include/drm/drm_bridge.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index
ce51b73e323ec5e188e84c9577803bd4934daf2b..7aeffb8bb3b2aeeae7a3a19435b6a1cf109a45cd
100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -1269,6 +1269,11 @@ static inline struct drm_bridge
*of_drm_find_bridge(struct device_node *np)
}
#endif
+static inline bool drm_bridge_is_last(struct drm_bridge *bridge)
+{
+ return list_is_last(&bridge->chain_node,
&bridge->encoder->bridge_chain);
+}
+
/**
* drm_bridge_get_current_state() - Get the current bridge state
* @bridge: bridge object
--
2.50.1
