From mboxrd@z Thu Jan 1 00:00:00 1970 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 7CBAFC55ABA for ; Tue, 4 Aug 2026 07:16:42 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id DB27310E89F; Tue, 4 Aug 2026 07:16:41 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (1024-bit key; unprotected) header.d=airkyi.com header.i=@airkyi.com header.b="ajVNQUJs"; dkim-atps=neutral Received: from smtpbgsg2.qq.com (smtpbgsg2.qq.com [54.254.200.128]) by gabe.freedesktop.org (Postfix) with ESMTPS id 9182110E89C for ; Tue, 4 Aug 2026 07:16:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=airkyi.com; s=altu2504; t=1785827279; bh=amLbFrLgaWKdM6iuB7UHZh23ZJ9tGg/UXF/7lGM7lOI=; h=From:To:Subject:Date:Message-Id; b=ajVNQUJsNYtpWpHibBj68O0ZfvEmjTRva5PYVPrtXWMNocWW5etM29Xlj50ZaqJe1 aU/dY1xYvSwg1kwfguNlqkdnm4RSwCVQ/BhPY31wEC4dzTC/kUdiCqRhd6HWDXFKqf UIpVsnE4kqwmRVzZHyzggezHo6jWzvdk2HdbS0cI= 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: NG7xP+P+sy64TtYG2Xj/Mfx8Hd53gpXDPG2J2B5YRPydySawGjFE4jmB Tvrf/YoXwHMUA1Y1X6Ly+pFjy0VF98FDEFTv7333tZ5d84HPZpOr26hRIWA4xQd+hMsqiKw vV1zPFjd9d7385GL/K/9NJQi5sIuS2PvNTNL+neg3JpN2qKqIOvTn4HoL7ORdL2CWCzWPXO erDCnOzgKj0J70j+HOjBb+T5PJ53dRCdp4m1g9q7M5H6y/a2qshjl1tby8nyp3f52w5u+5q 5Lt2yF3KbeZ/noV5ZH8Qw6UEAsqwoRmE2pGM5DcbplkNXsuKzuugQAcL+Rov3kUKjySGpby NoZ4x2jLIMK9mAvcgvbG5J3ZEWz11PtPu+60nub7oP5bC73+xyyBWyqA4CX2QqIqzxbuC3h Gn4lrL81K3xaPTEL9/ZyG5iWwBXpshhdLZcjDwLmhRvNQcy+2VAomYz0Ocqx4xV/iPosIRj IGdErbzhG3Xq3n3BoWyFj+/nPAnx41QulalkbmdcYs4s/pNUAa3hhSPqHA09VFHcaG6ehXj vtEAGB6GwdNOAsLv5eCWYFN63lR2bCYjK2x21I4QrF2Vqat6pQIpa4EoYaDLb0QGvHgr0r4 9TAT+Ue6SlxJ1BNcAijrRtQ4HDPL3FLIeaJz1OLGSH/r+vQYt3aJXWet3xP4qBJjgFIMYqJ oZBYT18BG+NrIH0UMVsZnG6sHoGXw/xuGDkWZ63/Qpy/TqY0NfG9qhvgltboSlvUTsWKxc5 TMMUa3O2GOr+SnbYTLRuJFJBRb5QBWFOVUV/i1OAV7h6R4Z0x/7sovgk9BTKVN5a9Mm32Lv 4VKmDigisaesStyqdz18dx81NO7HOSj6FMG2fhQzndsd0G9zG4l6Dwlv2nDlYN8rT8G1QV4 tc7T9u8glaUP2Igw8Tikb5FDh7QduV43SkR+ZJJLcJN3CvmOsM0V77AzysE1gp7yZECG4k9 UPURDc+h2UZEqXbjpd4j6ttAVvbzr9wiIvWzY9wKWqtfhCSXBOpaB58lsNYp4yaJrQ8yNSF FYqjl1uxCprjsO6+F8vMBSURRQoPI= X-QQ-XMRINFO: OD9hHCdaPRBwH5bRRRw8tsiH4UAatJqXfg== X-QQ-RECHKSPAM: 0 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" 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