[PATCH v2 2/9] drm/bridge: add drm_bridge_chain_get_last_bridge()
From: Luca Ceresoli <luca.ceresoli@bootlin.com>
Date: 2025-08-01 17:05:41
Also in:
dri-devel, imx, lkml
Subsystem:
drm drivers, drm drivers for bridge chips, the rest · Maintainers:
David Airlie, Simona Vetter, Andrzej Hajda, Neil Armstrong, Robert Foss, Linus Torvalds
Add an equivalent of drm_bridge_chain_get_first_bridge() to get the last bridge. Reviewed-by: Maxime Ripard <mripard@kernel.org> Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com> --- include/drm/drm_bridge.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 620e119cc24c3491c2be5f08efaf51dfa8f708b3..ce51b73e323ec5e188e84c9577803bd4934daf2b 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h@@ -1358,6 +1358,24 @@ drm_bridge_chain_get_first_bridge(struct drm_encoder *encoder) struct drm_bridge, chain_node)); } +/** + * drm_bridge_chain_get_last_bridge() - Get the last bridge in the chain + * @encoder: encoder object + * + * The refcount of the returned bridge is incremented. Use drm_bridge_put() + * when done with it. + * + * RETURNS: + * the last bridge in the chain, or NULL if @encoder has no bridge attached + * to it. + */ +static inline struct drm_bridge * +drm_bridge_chain_get_last_bridge(struct drm_encoder *encoder) +{ + return drm_bridge_get(list_last_entry_or_null(&encoder->bridge_chain, + struct drm_bridge, chain_node)); +} + /** * drm_for_each_bridge_in_chain() - Iterate over all bridges present in a chain * @encoder: the encoder to iterate bridges on
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2.50.1