drm/bridge: Add the drm_bridge_get_prev_bridge() helper (ac877c64) · Commits · 戴 / test

The drm_bridge_get_prev_bridge() helper will be useful for bridge drivers that want to do bus format negotiation with their neighbours. Signed-off-by:

Boris Brezillon <boris.brezillon@collabora.com> Reviewed-by:

Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by:

Neil Armstrong <narmstrong@baylibre.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191203141515.3597631-7-boris.brezillon@collabora.com

include/drm/drm_bridge.h

+16 −0

Original line number	Diff line number	Diff line
		@@ -426,6 +426,22 @@ drm_bridge_get_next_bridge(struct drm_bridge *bridge)
		return list_next_entry(bridge, chain_node);
		}

		/**
		* drm_bridge_get_prev_bridge() - Get the previous bridge in the chain
		* @bridge: bridge object
		*
		* RETURNS:
		* the previous bridge in the chain, or NULL if @bridge is the first.
		*/
		static inline struct drm_bridge *
		drm_bridge_get_prev_bridge(struct drm_bridge *bridge)
		{
		if (list_is_first(&bridge->chain_node, &bridge->encoder->bridge_chain))
		return NULL;

		return list_prev_entry(bridge, chain_node);
		}

		/**
		* drm_bridge_chain_get_first_bridge() - Get the first bridge in the chain
		* @encoder: encoder object

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