From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 85CAD26136B for ; Thu, 13 Mar 2025 12:00:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741867218; cv=none; b=pmUs0YdDut6xsTUZefSFRmFSHqFk0kcHEqU3zTcyvz/ywwIRLo0QGVjtoWFHPOLH262rCApNPB9HgrXrhEq+2MNuiHmwo6G3JI05hJcIPWTJdv2BL6ofefg7h7a/T7aGMH08mQiZp0pGYPm8gyM3Goafk0oDty17+ecD+bjrlXU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741867218; c=relaxed/simple; bh=gwr3V49Utd/SKmLHHtevd1iF7qftbaASGq6Mah8+cNI=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=lpnUEXpNYSikrJkScAu+5ycmQKTVtGsYjtusSGp5SxFlFk9toScUqGnXhVmWcy6+kRS1oa3BJBXTusgi9MPQVCmhN8Ow6czVlDIEvdjiB3aX3w2ey5Gof/Vukedje17SyjZ2rBY1SAHk1zar1sjZWC+aeHLKcCGLmi/CK7afkVg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Ob/nNi+z; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Ob/nNi+z" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DE6EDC4CEEB; Thu, 13 Mar 2025 12:00:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741867218; bh=gwr3V49Utd/SKmLHHtevd1iF7qftbaASGq6Mah8+cNI=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=Ob/nNi+zhKrLnG39o9effLm7IfK+Aoot/yxke/ynTbBGsZxn5zt6H0gD0JZS5Kv3T yfqzNsGU3KQDINGgZWTbOLfwjXDvNOctQDOp0w7wmM3JQ7AlIR2Uc8GzZGw9Jjes4W GRg70tVrgkbGjnzqmB6OS+R6Se0frXcZoZvqYmtpIhMPfZ9Axl209f4foNfHKFV9Wz 4RUiP1s9DpRaEjYd++2eEKBg97GExRBHNCHFkN/ZYhZ1CQHPfaFqZgiINuUksDDIdM BsE1ALXJENdq/y8OMk7hqs7b0BAjfTPLCywEjmFznligPj18ZHKqUXJlFds73ylfuR xLibtri2i10FQ== From: Maxime Ripard Date: Thu, 13 Mar 2025 12:59:56 +0100 Subject: [PATCH v6 02/16] drm/bridge: Provide a helper to retrieve current bridge state Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250313-bridge-connector-v6-2-511c54a604fb@kernel.org> References: <20250313-bridge-connector-v6-0-511c54a604fb@kernel.org> In-Reply-To: <20250313-bridge-connector-v6-0-511c54a604fb@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=gwr3V49Utd/SKmLHHtevd1iF7qftbaASGq6Mah8+cNI=; b=owGbwMvMwCX2+D1vfrpE4FHG02pJDOmXTuxjtdt9zSEprtvQ3JzvzwUr4YwtbXJOzqtVehfoW rd13+LrKGVhEONikBVTZIkRNl8Sd2rW6042vnkwc1iZQIYwcHEKwERklzIyLA2adUjp2bKvS4JE Jk2eu59/t3iv/+d9DB9eLjRVOaCrJMbI8MV4YiXb9ft3zb4+2sTvy7TgsW5Ok0xOfqpU79LbM+Y wMQEA X-Developer-Key: i=mripard@kernel.org; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D 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 884ff1faa4c896c28a38399ceaa5016ab704c886..cdad3b78a195aa39776c93e2371217d3d3fb6064 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: -- 2.48.1