From patchwork Tue Feb 25 16:43:50 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 13990285 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5509EC021BE for ; Tue, 25 Feb 2025 16:44:20 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 9555F10E74B; Tue, 25 Feb 2025 16:44:19 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="iRi2Tb4I"; dkim-atps=neutral Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by gabe.freedesktop.org (Postfix) with ESMTPS id 39EB210E1C7 for ; Tue, 25 Feb 2025 16:44:15 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 9A409612AB; Tue, 25 Feb 2025 16:44:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D2E39C4CEDD; Tue, 25 Feb 2025 16:44:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1740501850; bh=JgF9vOJBbu71izE1DQMLADlikJ3dVzuG54ze6IQ0bXQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=iRi2Tb4Ig4lK3NJG8vfPccbtFys8UxvZGObwTUVOxOBvCLKmDDO4ajhT5EP0bx/Q1 7DCZZfUJueCTh6oEsDytufmFjkJrpwm6+D4zoHgIRxd/H66NbEvka7Y3f5bF8e4jHn t7GtMybQN3blI6zMSu9M8CmIT1IjXfQQog4EzJvFcY6Qr/vQ/vnmUPzvOK2uRFAyIO BjEkQzgsYUZmxd23tn/c9OXdvHhQzvXWZzxoJW9BZtQbZQZ8aMEW9OuOnOPnBF3Aaf XyBfeJF7jOL5gNHG3gwsfCV2L7mPhCVKBUKvhEQMFR4ybbHeKOjHMiTeJ+39+tD6c+ p81ImV0wxi4/g== From: Maxime Ripard Date: Tue, 25 Feb 2025 17:43:50 +0100 Subject: [PATCH v4 02/15] drm/bridge: Provide a helper to retrieve current bridge state MIME-Version: 1.0 Message-Id: <20250225-bridge-connector-v4-2-7ecb07b09cad@kernel.org> References: <20250225-bridge-connector-v4-0-7ecb07b09cad@kernel.org> In-Reply-To: <20250225-bridge-connector-v4-0-7ecb07b09cad@kernel.org> To: Maarten Lankhorst , Thomas Zimmermann , David Airlie , Simona Vetter , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Douglas Anderson Cc: Herve Codina , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Maxime Ripard , Dmitry Baryshkov X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1723; i=mripard@kernel.org; h=from:subject:message-id; bh=JgF9vOJBbu71izE1DQMLADlikJ3dVzuG54ze6IQ0bXQ=; b=owGbwMvMwCmsHn9OcpHtvjLG02pJDOl7P3tFTXn0oKhSVIm/ZsJCT22TjO5X+/db7trpaN88V 6vCkOdxx1QWBmFOBlkxRZYnMmGnl7cvrnKwX/kDZg4rE8gQBi5OAZjI5VOMdaaHfYvmfPx/4ubm 6viVGw4xBAmGNbr8Tu1tXa/irsXvuvZ++rTevtl66m6/La7vm6joylifsp5R8DvnyzbXRUca5ZQ CtBdw1jB83BG7WGDSo89XPgtvuaO/rDO4Z6a0zeGPHhm79mcBAA== X-Developer-Key: i=mripard@kernel.org; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The current bridge state is accessible from the drm_bridge structure, but since it's fairly indirect it's not easy to figure out. Provide a helper to retrieve it. Reviewed-by: Dmitry Baryshkov Signed-off-by: Maxime Ripard --- include/drm/drm_bridge.h | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h index 2b65466540306feb0694abdc7cd801369cb9c9f0..6fb1da7c195e99143a67a999d16fe361c1e3f4ab 100644 --- a/include/drm/drm_bridge.h +++ b/include/drm/drm_bridge.h @@ -955,10 +955,42 @@ static inline struct drm_bridge *of_drm_find_bridge(struct device_node *np) { return NULL; } #endif +/** + * drm_bridge_get_current_state() - Get the current bridge state + * @bridge: bridge object + * + * This function must be called with the modeset lock held. + * + * RETURNS: + * + * The current bridge state, or NULL if there is none. + */ +static inline struct drm_bridge_state * +drm_bridge_get_current_state(struct drm_bridge *bridge) +{ + if (!bridge) + return NULL; + + /* + * Only atomic bridges will have bridge->base initialized by + * drm_atomic_private_obj_init(), so we need to make sure we're + * working with one before we try to use the lock. + */ + if (!bridge->funcs || !bridge->funcs->atomic_reset) + return NULL; + + drm_modeset_lock_assert_held(&bridge->base.lock); + + if (!bridge->base.state) + return NULL; + + return drm_priv_to_bridge_state(bridge->base.state); +} + /** * drm_bridge_get_next_bridge() - Get the next bridge in the chain * @bridge: bridge object * * RETURNS: