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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 589C1C44515 for ; Fri, 17 Jul 2026 07:24:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:List-Subscribe:List-Help: List-Post:List-Archive:List-Unsubscribe:List-Id:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=KJfysi7CFmR0L50w3YIH8UMrf4Dla+tQ2kAKh0E023s=; b=2QSxLDWC8wSDju /6P4eN6wgt3HLuqTl5lpPQyvBeFLnJD2l1Vqf33ZLAYCdkKFrzEgwcxSBsRrW1ziy00YXtZr/Q7XT yLu7x2PUP8JV4QMhhX7rXBjyVpNG+4tO4QCM/8VnZyFQDHyiCNYZkgQknZp6DKzQauuManFBcNpu4 x+EYgFK/KbeWnhe4px6eq8y/PSBFDLHIG813zeugzeySQpvyEXsFTm8co4NYOkWcteEFSLTIwC3jL uC46kTDEywT9kLq2xV7UmLQ1DFRqYjAWLFk6Ql197oBuOHcb6motW/lZ+8GD0HLn/Lm0gv9UeEwkJ 0b5s/wlVBzwD3XJPjb9g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wkcw5-00000001QMH-0FhR; Fri, 17 Jul 2026 07:24:41 +0000 Received: from smtpbguseast2.qq.com ([54.204.34.130]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wkcvs-00000001Q8C-2a9J; Fri, 17 Jul 2026 07:24:30 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=airkyi.com; s=altu2504; t=1784273017; bh=wyo7ub+4BApocKz9R0jl9tIayPTluBedW1dt0z+RsIE=; h=From:To:Subject:Date:Message-Id; b=DlqopraUkFrslsy1LOTBas2mktEhaeZbD6RmGUYXv1ziJ6kUrJwFc9qycfSb00Cee /YsaAxl3c6pan71zbzCB4Jyz2gJ09V8RRkJXoGrieIhDD00WOpzUyAYaOzM+S7HO24 uvMTsmdRq+URJ0KsND/43adg8LUCl2lH5zjkTmsE= X-QQ-mid: esmtpsz21t1784273015t55286922 X-QQ-Originating-IP: FCFwPLEn8pNCTJOV0JUPVpFgU5y4+bvUtPQEL4lUcV8= Received: from DESKTOP-8BT1A2O.localdomain ( [61.154.14.86]) by bizesmtp.qq.com (ESMTP) with id ; Fri, 17 Jul 2026 15:23:31 +0800 (CST) X-QQ-SSF: 0000000000000000000000000000000 X-QQ-GoodBg: 0 X-BIZMAIL-ID: 5852056859405087285 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 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 v3 1/5] drm/bridge: Implement generic USB Type-C DP HPD bridge Date: Fri, 17 Jul 2026 15:23:19 +0800 Message-Id: <20260717072323.96-2-kernel@airkyi.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20260717072323.96-1-kernel@airkyi.com> References: <20260717072323.96-1-kernel@airkyi.com> X-QQ-SENDSIZE: 520 Feedback-ID: esmtpsz:airkyi.com:qybglogicsvrgz:qybglogicsvrgz6b-0 X-QQ-XMAILINFO: OWrCF2BxNSO81qFU42EyhaIDJdXefRnEV+bk3DTVZttVbLicgPYAQwta mZJWcJXqz85rRgUPyWNaG5CSdIl7863t/GTzBDnCeZzjvbXZBQzoGwG7s6I5hXrWbut1FyH XwtxpyHnchv+VKBxSysnT2CGS2YnmH8G2/XVRQ7v9CuPTn/voeo+0CiP2LwhRNyY5hzN3PC AW760GIevzS+R7lnqza67DIgkVtBjOhibEKdhWddIsWK4Z9YYawCMgrqjOLt8fVb9IE5GJI sY3UpmIrZBXZIpRek2mxx4lXUOphew4oz+z3AUpKnnrKmsKP4uuGEJ1goVVlkJOmf2Bb5/U pS2tY9Nw/1OdCVmzSRCTjMxjiWAnPfo6Jxd2oDmVL8Xo5rum0zRLXnLYrtbOppw3dgbw1GE qUNLflpUY+ujndXHvp9wTvBgviCq8uSaRm9OMr8TXJiAJBqq5EyeP6BZIGIZMS4WZ92Hn6E tmWL58UFtMmS1+XmhdGjb5UB7wqplQ/xRYYadK+wgVrJF4+wKLUvR4Sm3Ks/SkZpQoqMjNl uI5Zvasq1JFoBdQDHdHlxyUg4tmzbMBANfPmRdPdSdLdDWhYQRo0T3L2Xp763CetTYJGv5F Uw+B5Pd161224BblCQGpJRVMUWWLURpMS0534SLJTHJvTaeLlYUEg2rIAY58nd39/EXxYMX kDyD14RnVo3IKqdssC4OIpCiJrZ8suG5v83QFZcDbkvXA7rFHp1NnVuMVuQyBc9AKXHa5Td j9ZNs7n4W903Pk4dBdhyXr0reBWDaaSsy3QytO8KySSFXX9oTDRcty4G0ZT6opUIljDmJOW GWgM2s9xRxrw9/93w2ZTqvUyiT61zlX11S789Zqi6eanSWLU7H5Sz3Bzjf1lylaQDw11z5H C9bV0kgOEzb4GfQM1eJOs+7u5DluBywpojTK9hckg+IvbFV0UNcf7Uhs7/umQGFzdMN7KNN hzqV3kdC11XQCphLJbJhJhE5L3sVR4ial/+VG52otDQihGYIp9NwaXPtHJi1hLOus3Bixel J7hhUExuxmpinOhadAf4X7qJW34L6gQZLaaVTTkg== X-QQ-XMRINFO: OD9hHCdaPRBwH5bRRRw8tsiH4UAatJqXfg== X-QQ-RECHKSPAM: 0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260717_002429_192808_A2F2FE23 X-CRM114-Status: GOOD ( 18.89 ) X-BeenThere: linux-phy@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux Phy Mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.org From: Chaoyi Chen The HPD function of Type-C DP is implemented through drm_connector_oob_hotplug_event(). For embedded DP, it is required that the DRM connector fwnode corresponds to the Type-C port fwnode. To describe the relationship between the DP controller and the Type-C port device, we usually using drm_bridge to build a bridge chain. Now several USB-C controller drivers have already implemented the DP HPD bridge function provided by aux-hpd-bridge.c, it will build a DP HPD bridge on USB-C connector port device. But this requires the USB-C controller driver to manually register the HPD bridge. If the driver does not implement this feature, the bridge will not be create. So this patch implements a generic DP HPD bridge based on aux-hpd-bridge.c. It will monitor Type-C bus events, and when a Type-C port device containing the DP svid is registered, it will create an HPD bridge for it without the need for the USB-C controller driver to implement it. Signed-off-by: Chaoyi Chen Reviewed-by: Heikki Krogerus Reviewed-by: Nicolas Frattaroli --- (no changes since v3) Changes in v2: - Add copyright text. - Remove useless goto. --- drivers/gpu/drm/bridge/Kconfig | 10 ++++ drivers/gpu/drm/bridge/Makefile | 1 + .../gpu/drm/bridge/aux-hpd-typec-dp-bridge.c | 54 +++++++++++++++++++ 3 files changed, 65 insertions(+) create mode 100644 drivers/gpu/drm/bridge/aux-hpd-typec-dp-bridge.c diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index 4a57d49b4c6d..9739b2a19758 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -30,6 +30,16 @@ config DRM_AUX_HPD_BRIDGE Simple bridge that terminates the bridge chain and provides HPD support. +if DRM_AUX_HPD_BRIDGE +config DRM_AUX_HPD_TYPEC_BRIDGE + tristate + depends on TYPEC || !TYPEC + default TYPEC + help + Simple bridge that terminates the bridge chain and provides HPD + support. It build bridge on each USB-C connector device node. +endif + menu "Display Interface Bridges" depends on DRM && DRM_BRIDGE diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile index 15cc821d85b7..d88a9e1ccc9a 100644 --- a/drivers/gpu/drm/bridge/Makefile +++ b/drivers/gpu/drm/bridge/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_DRM_AUX_BRIDGE) += aux-bridge.o obj-$(CONFIG_DRM_AUX_HPD_BRIDGE) += aux-hpd-bridge.o +obj-$(CONFIG_DRM_AUX_HPD_TYPEC_BRIDGE) += aux-hpd-typec-dp-bridge.o obj-$(CONFIG_DRM_CHIPONE_ICN6211) += chipone-icn6211.o obj-$(CONFIG_DRM_CHRONTEL_CH7033) += chrontel-ch7033.o obj-$(CONFIG_DRM_CROS_EC_ANX7688) += cros-ec-anx7688.o diff --git a/drivers/gpu/drm/bridge/aux-hpd-typec-dp-bridge.c b/drivers/gpu/drm/bridge/aux-hpd-typec-dp-bridge.c new file mode 100644 index 000000000000..c09579ff7ab9 --- /dev/null +++ b/drivers/gpu/drm/bridge/aux-hpd-typec-dp-bridge.c @@ -0,0 +1,54 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2026 Rockchip Electronics Co., Ltd. + * + * Author: Chaoyi Chen + */ +#include +#include +#include + +#include + +static int drm_typec_bus_event(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct device *dev = (struct device *)data; + struct typec_altmode *alt = to_typec_altmode(dev); + + if (action != BUS_NOTIFY_ADD_DEVICE) + return NOTIFY_OK; + + /* + * alt->dev.parent->parent : USB-C controller device + * alt->dev.parent : USB-C connector device + */ + if (is_typec_port_altmode(&alt->dev) && alt->svid == USB_TYPEC_DP_SID) + drm_dp_hpd_bridge_register(alt->dev.parent->parent, + to_of_node(alt->dev.parent->fwnode)); + + return NOTIFY_OK; +} + +static struct notifier_block drm_typec_event_nb = { + .notifier_call = drm_typec_bus_event, +}; + +static void drm_aux_hpd_typec_dp_bridge_module_exit(void) +{ + bus_unregister_notifier(&typec_bus, &drm_typec_event_nb); +} + +static int __init drm_aux_hpd_typec_dp_bridge_module_init(void) +{ + bus_register_notifier(&typec_bus, &drm_typec_event_nb); + + return 0; +} + +module_init(drm_aux_hpd_typec_dp_bridge_module_init); +module_exit(drm_aux_hpd_typec_dp_bridge_module_exit); + +MODULE_AUTHOR("Chaoyi Chen "); +MODULE_DESCRIPTION("DRM TYPEC DP HPD BRIDGE"); +MODULE_LICENSE("GPL"); -- 2.53.0 -- linux-phy mailing list linux-phy@lists.infradead.org https://lists.infradead.org/mailman/listinfo/linux-phy 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 07526C44517 for ; Fri, 17 Jul 2026 07:24:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:List-Subscribe:List-Help: List-Post:List-Archive:List-Unsubscribe:List-Id:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; 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Fri, 17 Jul 2026 15:23:31 +0800 (CST) X-QQ-SSF: 0000000000000000000000000000000 X-QQ-GoodBg: 0 X-BIZMAIL-ID: 5852056859405087285 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 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 v3 1/5] drm/bridge: Implement generic USB Type-C DP HPD bridge Date: Fri, 17 Jul 2026 15:23:19 +0800 Message-Id: <20260717072323.96-2-kernel@airkyi.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20260717072323.96-1-kernel@airkyi.com> References: <20260717072323.96-1-kernel@airkyi.com> X-QQ-SENDSIZE: 520 Feedback-ID: esmtpsz:airkyi.com:qybglogicsvrgz:qybglogicsvrgz6b-0 X-QQ-XMAILINFO: OWrCF2BxNSO81qFU42EyhaIDJdXefRnEV+bk3DTVZttVbLicgPYAQwta mZJWcJXqz85rRgUPyWNaG5CSdIl7863t/GTzBDnCeZzjvbXZBQzoGwG7s6I5hXrWbut1FyH XwtxpyHnchv+VKBxSysnT2CGS2YnmH8G2/XVRQ7v9CuPTn/voeo+0CiP2LwhRNyY5hzN3PC AW760GIevzS+R7lnqza67DIgkVtBjOhibEKdhWddIsWK4Z9YYawCMgrqjOLt8fVb9IE5GJI sY3UpmIrZBXZIpRek2mxx4lXUOphew4oz+z3AUpKnnrKmsKP4uuGEJ1goVVlkJOmf2Bb5/U pS2tY9Nw/1OdCVmzSRCTjMxjiWAnPfo6Jxd2oDmVL8Xo5rum0zRLXnLYrtbOppw3dgbw1GE qUNLflpUY+ujndXHvp9wTvBgviCq8uSaRm9OMr8TXJiAJBqq5EyeP6BZIGIZMS4WZ92Hn6E tmWL58UFtMmS1+XmhdGjb5UB7wqplQ/xRYYadK+wgVrJF4+wKLUvR4Sm3Ks/SkZpQoqMjNl uI5Zvasq1JFoBdQDHdHlxyUg4tmzbMBANfPmRdPdSdLdDWhYQRo0T3L2Xp763CetTYJGv5F Uw+B5Pd161224BblCQGpJRVMUWWLURpMS0534SLJTHJvTaeLlYUEg2rIAY58nd39/EXxYMX kDyD14RnVo3IKqdssC4OIpCiJrZ8suG5v83QFZcDbkvXA7rFHp1NnVuMVuQyBc9AKXHa5Td j9ZNs7n4W903Pk4dBdhyXr0reBWDaaSsy3QytO8KySSFXX9oTDRcty4G0ZT6opUIljDmJOW GWgM2s9xRxrw9/93w2ZTqvUyiT61zlX11S789Zqi6eanSWLU7H5Sz3Bzjf1lylaQDw11z5H C9bV0kgOEzb4GfQM1eJOs+7u5DluBywpojTK9hckg+IvbFV0UNcf7Uhs7/umQGFzdMN7KNN hzqV3kdC11XQCphLJbJhJhE5L3sVR4ial/+VG52otDQihGYIp9NwaXPtHJi1hLOus3Bixel J7hhUExuxmpinOhadAf4X7qJW34L6gQZLaaVTTkg== X-QQ-XMRINFO: OD9hHCdaPRBwH5bRRRw8tsiH4UAatJqXfg== X-QQ-RECHKSPAM: 0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260717_002429_192808_A2F2FE23 X-CRM114-Status: GOOD ( 18.89 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org From: Chaoyi Chen The HPD function of Type-C DP is implemented through drm_connector_oob_hotplug_event(). For embedded DP, it is required that the DRM connector fwnode corresponds to the Type-C port fwnode. To describe the relationship between the DP controller and the Type-C port device, we usually using drm_bridge to build a bridge chain. Now several USB-C controller drivers have already implemented the DP HPD bridge function provided by aux-hpd-bridge.c, it will build a DP HPD bridge on USB-C connector port device. But this requires the USB-C controller driver to manually register the HPD bridge. If the driver does not implement this feature, the bridge will not be create. So this patch implements a generic DP HPD bridge based on aux-hpd-bridge.c. It will monitor Type-C bus events, and when a Type-C port device containing the DP svid is registered, it will create an HPD bridge for it without the need for the USB-C controller driver to implement it. Signed-off-by: Chaoyi Chen Reviewed-by: Heikki Krogerus Reviewed-by: Nicolas Frattaroli --- (no changes since v3) Changes in v2: - Add copyright text. - Remove useless goto. --- drivers/gpu/drm/bridge/Kconfig | 10 ++++ drivers/gpu/drm/bridge/Makefile | 1 + .../gpu/drm/bridge/aux-hpd-typec-dp-bridge.c | 54 +++++++++++++++++++ 3 files changed, 65 insertions(+) create mode 100644 drivers/gpu/drm/bridge/aux-hpd-typec-dp-bridge.c diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index 4a57d49b4c6d..9739b2a19758 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -30,6 +30,16 @@ config DRM_AUX_HPD_BRIDGE Simple bridge that terminates the bridge chain and provides HPD support. +if DRM_AUX_HPD_BRIDGE +config DRM_AUX_HPD_TYPEC_BRIDGE + tristate + depends on TYPEC || !TYPEC + default TYPEC + help + Simple bridge that terminates the bridge chain and provides HPD + support. It build bridge on each USB-C connector device node. +endif + menu "Display Interface Bridges" depends on DRM && DRM_BRIDGE diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile index 15cc821d85b7..d88a9e1ccc9a 100644 --- a/drivers/gpu/drm/bridge/Makefile +++ b/drivers/gpu/drm/bridge/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_DRM_AUX_BRIDGE) += aux-bridge.o obj-$(CONFIG_DRM_AUX_HPD_BRIDGE) += aux-hpd-bridge.o +obj-$(CONFIG_DRM_AUX_HPD_TYPEC_BRIDGE) += aux-hpd-typec-dp-bridge.o obj-$(CONFIG_DRM_CHIPONE_ICN6211) += chipone-icn6211.o obj-$(CONFIG_DRM_CHRONTEL_CH7033) += chrontel-ch7033.o obj-$(CONFIG_DRM_CROS_EC_ANX7688) += cros-ec-anx7688.o diff --git a/drivers/gpu/drm/bridge/aux-hpd-typec-dp-bridge.c b/drivers/gpu/drm/bridge/aux-hpd-typec-dp-bridge.c new file mode 100644 index 000000000000..c09579ff7ab9 --- /dev/null +++ b/drivers/gpu/drm/bridge/aux-hpd-typec-dp-bridge.c @@ -0,0 +1,54 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2026 Rockchip Electronics Co., Ltd. + * + * Author: Chaoyi Chen + */ +#include +#include +#include + +#include + +static int drm_typec_bus_event(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct device *dev = (struct device *)data; + struct typec_altmode *alt = to_typec_altmode(dev); + + if (action != BUS_NOTIFY_ADD_DEVICE) + return NOTIFY_OK; + + /* + * alt->dev.parent->parent : USB-C controller device + * alt->dev.parent : USB-C connector device + */ + if (is_typec_port_altmode(&alt->dev) && alt->svid == USB_TYPEC_DP_SID) + drm_dp_hpd_bridge_register(alt->dev.parent->parent, + to_of_node(alt->dev.parent->fwnode)); + + return NOTIFY_OK; +} + +static struct notifier_block drm_typec_event_nb = { + .notifier_call = drm_typec_bus_event, +}; + +static void drm_aux_hpd_typec_dp_bridge_module_exit(void) +{ + bus_unregister_notifier(&typec_bus, &drm_typec_event_nb); +} + +static int __init drm_aux_hpd_typec_dp_bridge_module_init(void) +{ + bus_register_notifier(&typec_bus, &drm_typec_event_nb); + + return 0; +} + +module_init(drm_aux_hpd_typec_dp_bridge_module_init); +module_exit(drm_aux_hpd_typec_dp_bridge_module_exit); + +MODULE_AUTHOR("Chaoyi Chen "); +MODULE_DESCRIPTION("DRM TYPEC DP HPD BRIDGE"); +MODULE_LICENSE("GPL"); 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Fri, 17 Jul 2026 15:23:31 +0800 (CST) X-QQ-SSF: 0000000000000000000000000000000 X-QQ-GoodBg: 0 X-BIZMAIL-ID: 5852056859405087285 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 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 v3 1/5] drm/bridge: Implement generic USB Type-C DP HPD bridge Date: Fri, 17 Jul 2026 15:23:19 +0800 Message-Id: <20260717072323.96-2-kernel@airkyi.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20260717072323.96-1-kernel@airkyi.com> References: <20260717072323.96-1-kernel@airkyi.com> X-QQ-SENDSIZE: 520 Feedback-ID: esmtpsz:airkyi.com:qybglogicsvrgz:qybglogicsvrgz6b-0 X-QQ-XMAILINFO: OWrCF2BxNSO81qFU42EyhaIDJdXefRnEV+bk3DTVZttVbLicgPYAQwta mZJWcJXqz85rRgUPyWNaG5CSdIl7863t/GTzBDnCeZzjvbXZBQzoGwG7s6I5hXrWbut1FyH XwtxpyHnchv+VKBxSysnT2CGS2YnmH8G2/XVRQ7v9CuPTn/voeo+0CiP2LwhRNyY5hzN3PC AW760GIevzS+R7lnqza67DIgkVtBjOhibEKdhWddIsWK4Z9YYawCMgrqjOLt8fVb9IE5GJI sY3UpmIrZBXZIpRek2mxx4lXUOphew4oz+z3AUpKnnrKmsKP4uuGEJ1goVVlkJOmf2Bb5/U pS2tY9Nw/1OdCVmzSRCTjMxjiWAnPfo6Jxd2oDmVL8Xo5rum0zRLXnLYrtbOppw3dgbw1GE qUNLflpUY+ujndXHvp9wTvBgviCq8uSaRm9OMr8TXJiAJBqq5EyeP6BZIGIZMS4WZ92Hn6E tmWL58UFtMmS1+XmhdGjb5UB7wqplQ/xRYYadK+wgVrJF4+wKLUvR4Sm3Ks/SkZpQoqMjNl uI5Zvasq1JFoBdQDHdHlxyUg4tmzbMBANfPmRdPdSdLdDWhYQRo0T3L2Xp763CetTYJGv5F Uw+B5Pd161224BblCQGpJRVMUWWLURpMS0534SLJTHJvTaeLlYUEg2rIAY58nd39/EXxYMX kDyD14RnVo3IKqdssC4OIpCiJrZ8suG5v83QFZcDbkvXA7rFHp1NnVuMVuQyBc9AKXHa5Td j9ZNs7n4W903Pk4dBdhyXr0reBWDaaSsy3QytO8KySSFXX9oTDRcty4G0ZT6opUIljDmJOW GWgM2s9xRxrw9/93w2ZTqvUyiT61zlX11S789Zqi6eanSWLU7H5Sz3Bzjf1lylaQDw11z5H C9bV0kgOEzb4GfQM1eJOs+7u5DluBywpojTK9hckg+IvbFV0UNcf7Uhs7/umQGFzdMN7KNN hzqV3kdC11XQCphLJbJhJhE5L3sVR4ial/+VG52otDQihGYIp9NwaXPtHJi1hLOus3Bixel J7hhUExuxmpinOhadAf4X7qJW34L6gQZLaaVTTkg== X-QQ-XMRINFO: OD9hHCdaPRBwH5bRRRw8tsiH4UAatJqXfg== X-QQ-RECHKSPAM: 0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260717_002429_192808_A2F2FE23 X-CRM114-Status: GOOD ( 18.89 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Chaoyi Chen The HPD function of Type-C DP is implemented through drm_connector_oob_hotplug_event(). For embedded DP, it is required that the DRM connector fwnode corresponds to the Type-C port fwnode. To describe the relationship between the DP controller and the Type-C port device, we usually using drm_bridge to build a bridge chain. Now several USB-C controller drivers have already implemented the DP HPD bridge function provided by aux-hpd-bridge.c, it will build a DP HPD bridge on USB-C connector port device. But this requires the USB-C controller driver to manually register the HPD bridge. If the driver does not implement this feature, the bridge will not be create. So this patch implements a generic DP HPD bridge based on aux-hpd-bridge.c. It will monitor Type-C bus events, and when a Type-C port device containing the DP svid is registered, it will create an HPD bridge for it without the need for the USB-C controller driver to implement it. Signed-off-by: Chaoyi Chen Reviewed-by: Heikki Krogerus Reviewed-by: Nicolas Frattaroli --- (no changes since v3) Changes in v2: - Add copyright text. - Remove useless goto. --- drivers/gpu/drm/bridge/Kconfig | 10 ++++ drivers/gpu/drm/bridge/Makefile | 1 + .../gpu/drm/bridge/aux-hpd-typec-dp-bridge.c | 54 +++++++++++++++++++ 3 files changed, 65 insertions(+) create mode 100644 drivers/gpu/drm/bridge/aux-hpd-typec-dp-bridge.c diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index 4a57d49b4c6d..9739b2a19758 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -30,6 +30,16 @@ config DRM_AUX_HPD_BRIDGE Simple bridge that terminates the bridge chain and provides HPD support. +if DRM_AUX_HPD_BRIDGE +config DRM_AUX_HPD_TYPEC_BRIDGE + tristate + depends on TYPEC || !TYPEC + default TYPEC + help + Simple bridge that terminates the bridge chain and provides HPD + support. It build bridge on each USB-C connector device node. +endif + menu "Display Interface Bridges" depends on DRM && DRM_BRIDGE diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile index 15cc821d85b7..d88a9e1ccc9a 100644 --- a/drivers/gpu/drm/bridge/Makefile +++ b/drivers/gpu/drm/bridge/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_DRM_AUX_BRIDGE) += aux-bridge.o obj-$(CONFIG_DRM_AUX_HPD_BRIDGE) += aux-hpd-bridge.o +obj-$(CONFIG_DRM_AUX_HPD_TYPEC_BRIDGE) += aux-hpd-typec-dp-bridge.o obj-$(CONFIG_DRM_CHIPONE_ICN6211) += chipone-icn6211.o obj-$(CONFIG_DRM_CHRONTEL_CH7033) += chrontel-ch7033.o obj-$(CONFIG_DRM_CROS_EC_ANX7688) += cros-ec-anx7688.o diff --git a/drivers/gpu/drm/bridge/aux-hpd-typec-dp-bridge.c b/drivers/gpu/drm/bridge/aux-hpd-typec-dp-bridge.c new file mode 100644 index 000000000000..c09579ff7ab9 --- /dev/null +++ b/drivers/gpu/drm/bridge/aux-hpd-typec-dp-bridge.c @@ -0,0 +1,54 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2026 Rockchip Electronics Co., Ltd. + * + * Author: Chaoyi Chen + */ +#include +#include +#include + +#include + +static int drm_typec_bus_event(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct device *dev = (struct device *)data; + struct typec_altmode *alt = to_typec_altmode(dev); + + if (action != BUS_NOTIFY_ADD_DEVICE) + return NOTIFY_OK; + + /* + * alt->dev.parent->parent : USB-C controller device + * alt->dev.parent : USB-C connector device + */ + if (is_typec_port_altmode(&alt->dev) && alt->svid == USB_TYPEC_DP_SID) + drm_dp_hpd_bridge_register(alt->dev.parent->parent, + to_of_node(alt->dev.parent->fwnode)); + + return NOTIFY_OK; +} + +static struct notifier_block drm_typec_event_nb = { + .notifier_call = drm_typec_bus_event, +}; + +static void drm_aux_hpd_typec_dp_bridge_module_exit(void) +{ + bus_unregister_notifier(&typec_bus, &drm_typec_event_nb); +} + +static int __init drm_aux_hpd_typec_dp_bridge_module_init(void) +{ + bus_register_notifier(&typec_bus, &drm_typec_event_nb); + + return 0; +} + +module_init(drm_aux_hpd_typec_dp_bridge_module_init); +module_exit(drm_aux_hpd_typec_dp_bridge_module_exit); + +MODULE_AUTHOR("Chaoyi Chen "); +MODULE_DESCRIPTION("DRM TYPEC DP HPD BRIDGE"); +MODULE_LICENSE("GPL"); -- 2.53.0