From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtpbguseast3.qq.com (smtpbguseast3.qq.com [54.243.244.52]) (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 7880D39D6C9; Wed, 4 Mar 2026 09:42:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=54.243.244.52 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772617366; cv=none; b=QAy+U6yJhEi969p7yS8axLv/oAUoMSU6CP/z3G44B2stkE1LPsXgu8WzHeJLhpcwLRa9W4WOoTY0DPTvP8gyFuAEDmgzne0mL5Itm/NKqtO/RpI/6bj9x83jNxhpTyKx47mNXRVUZY+KVCnRs95jtSbPaEvR4NjtfziPZZ4gRh0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772617366; c=relaxed/simple; bh=xUSsOkydNp3uq6fFe9PAhbwC4yfTInu6czge2AyPPYU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References; b=GiVv364852Ix64p9YbQYxdgW/BNoWoMzUy7J0r9ENgupwE5fQPj5cLBeLQpD3KHbYzeEPr7IjdcRMQF5THadNK93QA9eBFByzypD74E5Yq0HJAH16tnkBd7idnhzLWkJOYnw1YRRfgZhD06X0ewP8ZwoEkBfsY5nmM6YWG0rN9g= 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=q2fs4vJJ; arc=none smtp.client-ip=54.243.244.52 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="q2fs4vJJ" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=airkyi.com; s=altu2504; t=1772617335; bh=OToeNz4t2oXNHYHV6Pu5IF6zpl5lN3hD9z93ek1ZgZE=; h=From:To:Subject:Date:Message-Id; b=q2fs4vJJ9Pg953M8YSK2nQHMIMiRHdNz52yKawru9WahwbK86GCNmPcX/0a9JcAqW mO4LoKqucSamaECPmvWfaZsAX7j4dsyuWCYEsoAurS30PO7X9rG1v5fxjqFWDroZ9X W3w+aKT/LpzRlxh1g3pvC3mIK2o2TWJ9uQIH+thk= X-QQ-mid: esmtpsz11t1772617328tcb692adf X-QQ-Originating-IP: eI4sld9gb/MYkTQBflnzN3OZF8EXbfFF/XhG0TH49SM= Received: from DESKTOP-8BT1A2O.localdomain ( [58.22.7.114]) by bizesmtp.qq.com (ESMTP) with id ; Wed, 04 Mar 2026 17:42:03 +0800 (CST) X-QQ-SSF: 0000000000000000000000000000000 X-QQ-GoodBg: 0 X-BIZMAIL-ID: 2636057480523225983 From: Chaoyi Chen To: Heikki Krogerus , Greg Kroah-Hartman , Dmitry Baryshkov , Peter Chen , Luca Ceresoli , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Vinod Koul , Kishon Vijay Abraham I , Heiko Stuebner , Sandy Huang , Andy Yan , Yubing Zhang , Frank Wang , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Amit Sunil Dhamne , Dragan Simic , Johan Jonker , Diederik de Haas , Peter Robinson , Hugh Cole-Baker Cc: linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-phy@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, dri-devel@lists.freedesktop.org, Chaoyi Chen Subject: [PATCH v15 1/9] drm/bridge: Implement generic USB Type-C DP HPD bridge Date: Wed, 4 Mar 2026 17:41:44 +0800 Message-Id: <20260304094152.92-2-kernel@airkyi.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20260304094152.92-1-kernel@airkyi.com> References: <20260304094152.92-1-kernel@airkyi.com> X-QQ-SENDSIZE: 520 Feedback-ID: esmtpsz:airkyi.com:qybglogicsvrgz:qybglogicsvrgz6b-0 X-QQ-XMAILINFO: MpO6L0LObisW8Yg5hLugK0zi9RCJcIL0K36m+Rd24XVYe2mRdfwIkBxv uvC8ZZXX5XZ80iW0pWPmv4vvgStOiY4RTMg/lXD6Gs7VLk4IKUi/4LDhrW4+e6x4h22IeQW Kwp8k9ttdsczmc274mAElzdfMnSMmjvF8yhcnkPyhPcrmDSoVLy7iDX+BnsjT0wEkQ/dsQy 1XkND4PT3wBJScYByvs6TfvMQAYod4CMqgf3N5XaZgsCXXRunT04WoDSFwyrZoURDc0Nr33 jKdd/X3CXnbwFl7pSye4cTAQzG8i8Hy3aLXET69aJSjryrBBQK5kcuxphU2+RW3PyjHSnDE fj2Ds8fSv7nGB1vvOphP5CQpdsUac64Pdk0b4FrEzGMjaWNuEkwsjAgHD5tF11ed6LRFTFS kEAJTRZe5P7woiiJ6aBaZxAXCOiL8etQmOxiCA5oz2Xm8EUDxPpUt0QPC7DHTgLpJ4/TXD1 Q24mxeW5Lw/iOhW247cwmcBsrI3UK8INVNo/VDXakTmqTptvJIkzegRejtYLkKRWaPWYmYh /lvkBppy3u7yHRdQkfVYUj9tUstGkQ4SwM1DyFSmYLVP0NK7NMqzdDm5ji8BVlK2rj37QHE Sus1AFD/86YY4ieEcrxEttaBxQ4ZjiOkMS2FE7gSHcKPePYTPNLaCeMbwU5vI5V4E1Lt64M BMiTkAsnfrb+c96Q4bvNjdmZLF3KSDFNcYznXXDbzOqiAJUI1fzZfANtzPcckjAvmS7OktU oF8KhBvemAMzlnuiF+RA+quAQ8XrGvEmsBftodGQEnNfUZgWcL9PkRxrhsMblMbKBx4haLA aj7gl2jhj8Dbb5qXKZ/jKdZlYkBJwKO14zh6mi0wWl8TS0KK1NIEnrCTaRAku4Dq3hATlgs 22CNspAJZcnhPdLI3lNdt22an/qqncbaw8TDjSuyu4sT6+qqzfwc+6PremvJciGj4gQ745W Fx6W/0EI4usiNN3BdreRCjiW/8igccK0ZfUnRNFUMiVl40qkEdCeAQusZ8dmuQ1ebmnxzGP lMcFlbZ5BF+wAsTFGp X-QQ-XMRINFO: NyFYKkN4Ny6FuXrnB5Ye7Aabb3ujjtK+gg== X-QQ-RECHKSPAM: 0 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 --- (no changes since v14) Changes in v13: - Only register drm dp hpd bridge for typec port altmode device. (no changes since v12) Changes in v11: - Switch to using typec bus notifiers. (no changes since v10) Changes in v9: - Remove the exposed DRM_AUX_HPD_BRIDGE option, and select DRM_AUX_HPD_TYPEC_BRIDGE when it is available. - Add more commit comment about problem background. Changes in v8: - Merge generic DP HPD bridge into one module. --- drivers/gpu/drm/bridge/Kconfig | 10 ++++ drivers/gpu/drm/bridge/Makefile | 1 + .../gpu/drm/bridge/aux-hpd-typec-dp-bridge.c | 49 +++++++++++++++++++ 3 files changed, 60 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 a250afd8d662..559487aa09a9 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 c7dc03182e59..a3a0393d2e72 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..d915e0fb0668 --- /dev/null +++ b/drivers/gpu/drm/bridge/aux-hpd-typec-dp-bridge.c @@ -0,0 +1,49 @@ +// SPDX-License-Identifier: GPL-2.0+ +#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) + goto done; + + /* + * 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)); + +done: + 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_DESCRIPTION("DRM TYPEC DP HPD BRIDGE"); +MODULE_LICENSE("GPL"); -- 2.51.1