From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtpbguseast1.qq.com (smtpbguseast1.qq.com [54.204.34.129]) (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 68F8E3F211A for ; Tue, 4 Aug 2026 07:08:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=54.204.34.129 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785827300; cv=none; b=uxNma764a8qP4GM354NISogGfSn94JddLLGDVlmKW9wF5rQ281SKmshGkgq00/ajCQ6iP4n0mUdUjkaAwlXeGewPUwH5PCf4CjqBJmUf7zz3L8Vo274JdDy62QvT9gU5FFm8xP5+DsdNg6LldSPQZUq+OCc8ZKe+Ejs0XSJmv58= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785827300; c=relaxed/simple; bh=dt1yYLhIWfjIc/65Ejosz8UrCO86llS84fUjglXJcTY=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References; b=Lc7brUYIXrdABAxLE1An6Vojx0SoNO3VBrmDtbAoE2y2ri3Chb8zpTotYbheaQczKqhDGo4Oz0mJAt6F3DilLurKyYotFNUXS8U7RaZJKElybjThp+RB4pQV6BZEjIVjF96g5RxOqr4k51bB7LrWOaBN44mQ9a7k6BTiGgK0WHs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=airkyi.com; spf=pass smtp.mailfrom=airkyi.com; dkim=pass (1024-bit key) header.d=airkyi.com header.i=@airkyi.com header.b=cJfvn0qQ; arc=none smtp.client-ip=54.204.34.129 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=airkyi.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=airkyi.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=airkyi.com header.i=@airkyi.com header.b="cJfvn0qQ" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=airkyi.com; s=altu2504; t=1785827278; bh=amLbFrLgaWKdM6iuB7UHZh23ZJ9tGg/UXF/7lGM7lOI=; h=From:To:Subject:Date:Message-Id; b=cJfvn0qQqgJwLba+6SZoAjhEyHrabgBrxCfRCFjnC2X6xNZvCa3ZK9fODfnDkcdEP 3NR7IKdZBa/Q37jda7reVULXaYisQ0JY6GKlFQ0KHNOhoiY6cCXv9HQ9kUx6F350Yb 3GJ6PEdvYa4bhC7MYSW4OmIovpUbS1GTTwwcOXng= X-QQ-mid: esmtpsz19t1785827277tf63c1686 X-QQ-Originating-IP: n7cCnMgNG0f8iJN7ZfLIqZBWbzE4V65U0d+YdsMycP4= Received: from DESKTOP-8BT1A2O.localdomain ( [61.154.14.86]) by bizesmtp.qq.com (ESMTP) with id ; Tue, 04 Aug 2026 15:07:54 +0800 (CST) X-QQ-SSF: 0000000000000000000000000000000 X-QQ-GoodBg: 0 X-BIZMAIL-ID: 13234408375334642489 From: Chaoyi Chen To: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Sandy Huang , =?UTF-8?q?Heiko=20St=C3=BCbner?= , Andy Yan , Vinod Koul , Chaoyi Chen , Sebastian Reichel , Nicolas Frattaroli , Heikki Krogerus Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-phy@lists.infradead.org Subject: [PATCH v6 1/7] drm/bridge: aux-hpd-bridge: Add drm_dev_has_dp_hpd_bridge() Date: Tue, 4 Aug 2026 15:07:24 +0800 Message-Id: <20260804070730.68-2-kernel@airkyi.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20260804070730.68-1-kernel@airkyi.com> References: <20260804070730.68-1-kernel@airkyi.com> X-QQ-SENDSIZE: 520 Feedback-ID: esmtpsz:airkyi.com:qybglogicsvrgz:qybglogicsvrgz6b-0 X-QQ-XMAILINFO: OGvgEoGelOUdnQDqmpVkzPPIpZGxg0gBgEjIiDVod56HxjXzSKhuJwtJ Oj7WvJdiQQbxbc1hntvZhz2f801NZ2Xf0NhURig5Xp9vNXUGIKDbysD2J0kL6YZOH59HFyu iut/vtti8fTK7WkKjFDbhsxToQuY6Xu/RV4alQP/QX1WPg5CI93HXdqH/tlXHakkDz3vllN 2avJ3KvAnU09ODQZJ0/1TP6Jz9+Q7ya8AfTxqkQJ7jpq22aztQhRU5yV4Ii79fVWbpMrU9r rX3tadVBPgCHADXvqUaEnbUnH7Xtm3DX4LTYImZQ+AUqblNEQnVpauceoktPeI4TWNK4hoW z7JFaoePCsM3u4s3utHErDX81bWmgMHhpFxEN7IjvHAj8AlXG5uOfBksJdWpwF6L3BxwqrH 46YDtDNsVtPL1QXpGxKNK6aNhOG7VoxavjuN2uJ2bVqf6ZjqJaAvFsO3AsKMiJq8XHgISJ/ 5cnW4IITqq1bPWmBVO/LnnQaUg1mn1kgdQuPShpfUFH0WhVKP/0w29hFqvzV4zWFtFkvP54 56vf8tnB/ciO0YiDKW4/QZ/HWLLNeF95vNayO4tzP+u6U8xb2SOD8DYm0L7aLNX3NGSo2S9 y7HG2NJgcyAshVqaZaoWO0rO55t+KyZWaG3wCy6teVeJ/euWEXLMC+lx+gk9noaFAVjfWZk VjQzcCcUbELQXEUGlqIiMu83AXCpMsamhYXTsdmmsUM9dKi/1d5TkP8+3x+Ny0Nyj56Bjmz i2HZyJMcvasKQwpnEhOn2UkA/5Qjv2jbhQ4LKCOE/Zs0vpxeBD+jiysPPy78iEMct7xVI/U m5ng6W6eWEGsektDRvAqzTmKa7jZvT/bVbgz3qYU64wHAxMh2hl/+DfUF2MOtD3sqKJc7Vm QRcRH8Ml0F6gCFtUeW79NaSqZQC75FHjKh1Nlw/LezDbNZB9UwKWvM31OplMn9G2QYsAmGN niDuGTZ0mjnAqBJyRYkmwp88D9cIA0ciX1jHSjL6rxhIWjSJuIfNbO4MA8cC/lEgdZnVCpr y/zpEDWnuQSvqukwg1XdBdy24LE+I= X-QQ-XMRINFO: NS+P29fieYNwqS3WCnRCOn9D1NpZuCnCRA== X-QQ-RECHKSPAM: 0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: From: Chaoyi Chen Add a new API to check whether a DisplayPort HPD bridge has already been registered. This helps avoid duplicate registration of the same HPD bridge, although the current framework allows doing so. Suggested-by: Sebastian Reichel Signed-off-by: Chaoyi Chen --- drivers/gpu/drm/bridge/aux-hpd-bridge.c | 42 ++++++++++++++++++++++++- include/drm/bridge/aux-bridge.h | 6 ++++ 2 files changed, 47 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/bridge/aux-hpd-bridge.c b/drivers/gpu/drm/bridge/aux-hpd-bridge.c index f02a38a2638a..a56c88eba005 100644 --- a/drivers/gpu/drm/bridge/aux-hpd-bridge.c +++ b/drivers/gpu/drm/bridge/aux-hpd-bridge.c @@ -12,6 +12,8 @@ #include #include +#define DRM_AUX_HPD_BRIDGE_NAME "dp_hpd_bridge" + static DEFINE_IDA(drm_aux_hpd_bridge_ida); struct drm_aux_hpd_bridge_data { @@ -36,6 +38,44 @@ static void drm_aux_hpd_bridge_free_adev(void *_adev) auxiliary_device_uninit(_adev); } +static int hpd_bridge_match(struct device *dev, const void *data) +{ + const struct device_node *np = data; + struct auxiliary_device *adev; + + if (!dev_is_auxiliary(dev)) + return 0; + + adev = to_auxiliary_dev(dev); + if (strcmp(adev->name, DRM_AUX_HPD_BRIDGE_NAME)) + return 0; + + return adev->dev.platform_data == np; +} + +/** + * drm_dev_has_dp_hpd_bridge - check whether a HPD DisplayPort bridge is registered + * @parent: device instance providing this bridge + * @np: device node pointer corresponding to this bridge instance + * + * Walk the children of @parent and check whether a HPD DisplayPort bridge for + * the given @np has already been registered via devm_drm_dp_hpd_bridge_add(). + * + * Return: true if a HPD bridge for @parent / @np already exists, false otherwise + */ +bool drm_dev_has_dp_hpd_bridge(struct device *parent, struct device_node *np) +{ + struct device *child; + + child = device_find_child(parent, np, hpd_bridge_match); + if (child) { + put_device(child); + return true; + } + return false; +} +EXPORT_SYMBOL_GPL(drm_dev_has_dp_hpd_bridge); + /** * devm_drm_dp_hpd_bridge_alloc - allocate a HPD DisplayPort bridge * @parent: device instance providing this bridge @@ -63,7 +103,7 @@ struct auxiliary_device *devm_drm_dp_hpd_bridge_alloc(struct device *parent, str } adev->id = ret; - adev->name = "dp_hpd_bridge"; + adev->name = DRM_AUX_HPD_BRIDGE_NAME; adev->dev.parent = parent; adev->dev.release = drm_aux_hpd_bridge_release; adev->dev.platform_data = of_node_get(np); diff --git a/include/drm/bridge/aux-bridge.h b/include/drm/bridge/aux-bridge.h index c2f5a855512f..cca07a8e2d45 100644 --- a/include/drm/bridge/aux-bridge.h +++ b/include/drm/bridge/aux-bridge.h @@ -25,6 +25,7 @@ struct auxiliary_device *devm_drm_dp_hpd_bridge_alloc(struct device *parent, str int devm_drm_dp_hpd_bridge_add(struct device *dev, struct auxiliary_device *adev); struct device *drm_dp_hpd_bridge_register(struct device *parent, struct device_node *np); +bool drm_dev_has_dp_hpd_bridge(struct device *parent, struct device_node *np); void drm_aux_hpd_bridge_notify(struct device *dev, enum drm_connector_status status); #else static inline struct auxiliary_device *devm_drm_dp_hpd_bridge_alloc(struct device *parent, @@ -44,6 +45,11 @@ static inline struct device *drm_dp_hpd_bridge_register(struct device *parent, return NULL; } +static inline bool drm_dev_has_dp_hpd_bridge(struct device *parent, struct device_node *np) +{ + return false; +} + static inline void drm_aux_hpd_bridge_notify(struct device *dev, enum drm_connector_status status) { } -- 2.53.0