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bh=oM95PjcRikyO3sPH9AVOKQwjpoJ/s1h7pZhmKVi6Q4M=; b=R4KIPmXLfMb2D5hYOdhjbeFLTMUOBhnAi5q6APf38pqzbdicvp8iNMiwm14Yid68lqhduj 4ktqdnyVbIHmA3OYfbfV88crIo/miNYH9peK656A57r7LYXygFxBmnEboKgM0+qEtYEpju Z2XN5wxmlY9V7MFTLBlOEXucVlLKh2d3DQj9m04h4djEkOw1gpqV2T4z4d7O5rGCbtzyMf OgKizfrTaRlnmLSm+wk2tKnnemwC21bzvkZAo18FflV8xqpU/JHgEaJolZJ1DWXnWqXWFF tACPDdVrTmqsL08jwlcnq9I03eJBo70aQAlYaRmACEhO0jblZzEI+Z4gEbtKJA== From: Luca Ceresoli Date: Fri, 01 Aug 2025 19:05:27 +0200 Subject: [PATCH v2 5/9] drm/bridge: add drm_bridge_is_last() Precedence: bulk X-Mailing-List: imx@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250801-drm-bridge-alloc-getput-drm_bridge_get_next_bridge-v2-5-888912b0be13@bootlin.com> References: <20250801-drm-bridge-alloc-getput-drm_bridge_get_next_bridge-v2-0-888912b0be13@bootlin.com> In-Reply-To: <20250801-drm-bridge-alloc-getput-drm_bridge_get_next_bridge-v2-0-888912b0be13@bootlin.com> To: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Liu Ying , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Tomi Valkeinen , Philipp Zabel Cc: Hui Pu , Thomas Petazzoni , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, Luca Ceresoli X-Mailer: b4 0.14.2 X-GND-State: clean X-GND-Score: -100 X-GND-Cause: gggruggvucftvghtrhhoucdtuddrgeeffedrtdefgddutdegvdegucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuifetpfffkfdpucggtfgfnhhsuhgsshgtrhhisggvnecuuegrihhlohhuthemuceftddunecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhfffugggtgffkfhgjvfevofesthejredtredtjeenucfhrhhomhepnfhutggrucevvghrvghsohhlihcuoehluhgtrgdrtggvrhgvshholhhisegsohhothhlihhnrdgtohhmqeenucggtffrrghtthgvrhhnpeeiieeuvdfftefgueduleehueetgffgjeeitedtteetkeeuueeuueekveevvdeuveenucfkphepvdgrtddvmeeijedtmedvtddvtdemvggrtddumegsvgegudemleehvgejmeefgeefmeeludefvgenucevlhhushhtvghrufhiiigvpedvnecurfgrrhgrmhepihhnvghtpedvrgdtvdemieejtdemvddtvddtmegvrgdtudemsggvgedumeelhegvjeemfeegfeemledufegvpdhhvghloheplgduledvrdduieekrddujeekrdduudekngdpmhgrihhlfhhrohhmpehluhgtrgdrtggvrhgvshholhhisegsohhothhlihhnrdgtohhmpdhnsggprhgtphhtthhopedvhedprhgtphhtthhopehmrggrrhhtvghnrdhlrghnkhhhohhrshhtsehlihhnuhigrdhinhhtvghlrdgtohhmpdhrtghpthhtohepphdriigrsggvlhesphgvnhhguhhtrhhonhhigidruggvpdhrtghpthhtohepshhhrgifnhhguhhosehkvghrnhgvl hdrohhrghdprhgtphhtthhopefjuhhirdfruhesghgvhhgvrghlthhhtggrrhgvrdgtohhmpdhrtghpthhtohepughrihdquggvvhgvlheslhhishhtshdrfhhrvggvuggvshhkthhophdrohhrghdprhgtphhtthhopegrnhgurhiivghjrdhhrghjuggrsehinhhtvghlrdgtohhmpdhrtghpthhtoheprhhfohhssheskhgvrhhnvghlrdhorhhgpdhrtghpthhtohepthhhohhmrghsrdhpvghtrgiiiihonhhisegsohhothhlihhnrdgtohhm 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 Signed-off-by: Luca Ceresoli --- 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