From patchwork Tue Mar 4 11:10:45 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 14000481 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 AFFE0C282D6 for ; Tue, 4 Mar 2025 11:11:14 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 9647E10E520; Tue, 4 Mar 2025 11:11:10 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="GyEHfAg7"; dkim-atps=neutral Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by gabe.freedesktop.org (Postfix) with ESMTPS id 84A1810E575 for ; Tue, 4 Mar 2025 11:11:09 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 2CA795C5AF4; Tue, 4 Mar 2025 11:08:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 555BDC4CEE5; Tue, 4 Mar 2025 11:11:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741086668; bh=JgF9vOJBbu71izE1DQMLADlikJ3dVzuG54ze6IQ0bXQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=GyEHfAg79XpJJhmAImbNHNp9u0Qdgk4wDVq+tQW/TC8AwsusnH298URaFF1sVQolj vmRl/RPgwh20em1oMneORsqAubANTa6vZjlWgv1sFRxR7C/0L4BFbWaMB40W7y1bXv p6xUc+Wo+Jh38enU8zyh0kUiLa95jH1noOkSPPBAeiCAy9TbgGsTG8bIYz9a0IaZAY hSHPFPAjXz2IvT7jJKHmNMJ5JexSr7dGk5tPvy/9R5hbbmBDpz2NJ0pbgmNN8gIqjw WLBz5oQAVjJ6Fa6rLMxyzFfd86O5n5Yea1xN6VG+bEkORXOhku6rBT+QdL8WUylmuG 0YuSbmtv17aMw== From: Maxime Ripard Date: Tue, 04 Mar 2025 12:10:45 +0100 Subject: [PATCH v5 02/16] drm/bridge: Provide a helper to retrieve current bridge state MIME-Version: 1.0 Message-Id: <20250304-bridge-connector-v5-2-aacf461d2157@kernel.org> References: <20250304-bridge-connector-v5-0-aacf461d2157@kernel.org> In-Reply-To: <20250304-bridge-connector-v5-0-aacf461d2157@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=owGbwMvMwCmsHn9OcpHtvjLG02pJDOnH7u81LNNgFXd/0LKj6MejNRvV7yV/+ff59jS/XdyN+ zJjEs686ZjKwiDMySArpsjyRCbs9PL2xVUO9it/wMxhZQIZwsDFKQATWZ/NWJ9ncsom8/HkG+wb thxaEjYreukM0Vbt/Adb1N79l830t6t8wmo1LXJCbKvJliUbpb6p3mKsU+AxsXArjInbKp6w9rG VaO+ciqzpnC5JgvphO8K6nty0SOt4uZun78GLI3NVVm1zNv8NAA== 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: