From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay8-d.mail.gandi.net (relay8-d.mail.gandi.net [217.70.183.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F33EC23507A for ; Wed, 9 Jul 2025 16:48:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752079736; cv=none; b=XIIvq1RmsnZXRpmPl3kWBNFCUi6CHVjaFYLF68cVwFrFS40H4H2aQwkbN06UjRc2U5oYd2Rfn+dCw6RCejw0J9Ecn5W//HjQSHeyHYEHoR9np9BOQTrdYZm673kvC74XaFYweAgU9g7Q4KrmpF9Ei3R1sKNqV5mNJC8mRZGMszI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752079736; c=relaxed/simple; bh=Nz5ZaJvq2SpeTCXQeHkX4qjMf8EUFCkGQjQYQii2lhg=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=vFi2fhaJuhqVg/JfBYA6waTrbHSFfyghAEGhWCE+wc9bpW2Gm9vVzU/9rwqV1ofW2u6a34MmghKPNtALNCbGWgJFtVmdEmqL6TdRn9+mfj6t+1WlLXUj6+iCmIs7t7VzBGUuuganoliPvJ/gK5Q8IGagh03bqTeJSLZrSaenB/I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=aXWvZKQX; arc=none smtp.client-ip=217.70.183.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="aXWvZKQX" Received: by mail.gandi.net (Postfix) with ESMTPSA id 92B6E4447A; Wed, 9 Jul 2025 16:48:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1752079733; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=jIibqyJNygtdMjhNsAuXg/eB4j41i3y0QJrk3xzhjtk=; b=aXWvZKQX+FwJvKOOEwvwnHWJWc5ePsuYjerVgeH3T5AVCZVoQwQQhAFd0x8TJ8ihQTDeR2 I0PPdSpmgINr7tKF4/jf+8MIpYUixa+0A57tGK0sso7105mcOITrwYQTK6Mhf+uBX8qbV+ kFO4tI7n88a5ypomXm/Y0D9WrVFuNYvhPDZfPNIm3ocY1DJY1QgF6i4NeZZUSwPAynolPn ZAMTdCkd60t5rCE2FO1gmMNglje8zyBmTCWg7GX60TMjDUIpuVV2JcAExetJgfyKYs3NjG +Tc+iQcJv4jDo+VVFc0ClbqgGU+Gagp1zvaBHm3ctawFrIVqGfNLv+o6XAXajQ== From: Luca Ceresoli Date: Wed, 09 Jul 2025 18:48:04 +0200 Subject: [PATCH 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: <20250709-drm-bridge-alloc-getput-drm_bridge_get_next_bridge-v1-5-48920b9cf369@bootlin.com> References: <20250709-drm-bridge-alloc-getput-drm_bridge_get_next_bridge-v1-0-48920b9cf369@bootlin.com> In-Reply-To: <20250709-drm-bridge-alloc-getput-drm_bridge_get_next_bridge-v1-0-48920b9cf369@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: gggruggvucftvghtrhhoucdtuddrgeeffedrtdefgdefkedtkecutefuodetggdotefrodftvfcurfhrohhfihhlvgemucfitefpfffkpdcuggftfghnshhusghstghrihgsvgenuceurghilhhouhhtmecufedtudenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhephfffufggtgfgkfhfjgfvvefosehtjeertdertdejnecuhfhrohhmpefnuhgtrgcuvegvrhgvshholhhiuceolhhutggrrdgtvghrvghsohhlihessghoohhtlhhinhdrtghomheqnecuggftrfgrthhtvghrnhepieeiuedvffetgfeuudelheeutefggfejieettdetteekueeuueeukeevvedvueevnecukfhppeekjedruddvtddrvddukedrvddtjeenucevlhhushhtvghrufhiiigvpeegnecurfgrrhgrmhepihhnvghtpeekjedruddvtddrvddukedrvddtjedphhgvlhhopegludelvddrudeikedruddrudefngdpmhgrihhlfhhrohhmpehluhgtrgdrtggvrhgvshholhhisegsohhothhlihhnrdgtohhmpdhnsggprhgtphhtthhopedvhedprhgtphhtthhopehtiihimhhmvghrmhgrnhhnsehsuhhsvgdruggvpdhrtghpthhtohepihhmgieslhhishhtshdrlhhinhhugidruggvvhdprhgtphhtthhopefjuhhirdfruhesghgvhhgvrghlthhhtggrrhgvrdgtohhmpdhrtghpthhtohepthhomhhirdhvrghlkhgvihhnvghnsehiuggvrghsohhnsghorghrugdrtghomhdprhgtphhtthhopehvihgtthhorhdrlhhiuhesn higphdrtghomhdprhgtphhtthhopehshhgrfihnghhuoheskhgvrhhnvghlrdhorhhgpdhrtghpthhtohepthhhohhmrghsrdhpvghtrgiiiihonhhisegsohhothhlihhnrdgtohhmpdhrtghpthhtohepphdriigrsggvlhesphgvnhhguhhtrhhonhhigidruggv X-GND-Sasl: luca.ceresoli@bootlin.com 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. 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 9a7e9dd8cbfa54eedb82981032a25009e845a037..c2a7a7d2dfc420e9dcf7ea4c093ce1f1b939c820 100644 --- a/include/drm/drm_bridge.h +++ b/include/drm/drm_bridge.h @@ -1264,6 +1264,11 @@ 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 -- 2.50.0