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authorLuca Ceresoli <luca.ceresoli@bootlin.com>2025-08-01 19:05:27 +0200
committerLuca Ceresoli <luca.ceresoli@bootlin.com>2025-09-02 11:38:29 +0200
commite4cedfd4f0fc839bb3c783d7e827e9755e1af5cf (patch)
treee59a4c2e978bfc6b0ce6d7a6095cb63f2d2ec2fb
parentc3183f71c3f1f004a0ca0b84c45c40d8b84dce3d (diff)
drm/bridge: add drm_bridge_is_last()
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 <mripard@kernel.org> Link: https://lore.kernel.org/r/20250801-drm-bridge-alloc-getput-drm_bridge_get_next_bridge-v2-5-888912b0be13@bootlin.com Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
-rw-r--r--include/drm/drm_bridge.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 788517ab00d3..76e05930f50e 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -1321,6 +1321,11 @@ 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