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 52425CD343F for ; Thu, 21 May 2026 03:39:13 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B464C10F1C9; Thu, 21 May 2026 03:39:12 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (1024-bit key; unprotected) header.d=airkyi.com header.i=@airkyi.com header.b="hQH5r9+f"; dkim-atps=neutral X-Greylist: delayed 542 seconds by postgrey-1.36 at gabe; Thu, 21 May 2026 03:39:10 UTC Received: from smtpbgbr2.qq.com (smtpbgbr2.qq.com [54.207.22.56]) by gabe.freedesktop.org (Postfix) with ESMTPS id 7A6BE10F1C9 for ; Thu, 21 May 2026 03:39:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=airkyi.com; s=altu2504; t=1779334745; bh=dvxDCR9NEJvWoy2vX4KZL4araFw0lNuTo/DvCOAIkrU=; h=From:To:Subject:Date:Message-Id; b=hQH5r9+fT0XBBjE6G7SF685Nx+Xh6cyetCklaleK265tcElDtZvcXuSHygJCeQMlJ MjHVxGv2oltrKymBaCqt2zPwQPOlo5ng0S/m9f4pJEgaSeuclq3rbbIe8DFVqYIzHI bNOUXa4Wz5Iza/5Tep1g8Whp1NrQc9OYieeih62M= X-QQ-mid: zesmtpsz7t1779334159t70c25ab6 X-QQ-Originating-IP: ADiEYj7Uo9gkcTDRzLm44seRmsr0fa8KAQZuAK83eDk= Received: from DESKTOP-8BT1A2O.localdomain ( [58.22.7.114]) by bizesmtp.qq.com (ESMTP) with id ; Thu, 21 May 2026 11:29:13 +0800 (CST) X-QQ-SSF: 0000000000000000000000000000000 X-QQ-GoodBg: 0 X-BIZMAIL-ID: 1170275653122731540 From: Chaoyi Chen To: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Sandy Huang , =?UTF-8?q?Heiko=20St=C3=BCbner?= , Andy Yan , Vinod Koul Cc: Heikki Krogerus , Dmitry Baryshkov , Luca Ceresoli , 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, Chaoyi Chen Subject: [PATCH 1/5] drm/bridge: Implement generic USB Type-C DP HPD bridge Date: Thu, 21 May 2026 11:28:50 +0800 Message-Id: <20260521032854.103-2-kernel@airkyi.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20260521032854.103-1-kernel@airkyi.com> References: <20260521032854.103-1-kernel@airkyi.com> X-QQ-SENDSIZE: 520 Feedback-ID: zesmtpsz:airkyi.com:qybglogicsvrgz:qybglogicsvrgz6b-0 X-QQ-XMAILINFO: NO0eLx0aUO/YSqzQtUTy63sGaqEINr5cyPkxOaLWSSjHeAlLajpeXlUu 3dd79oqC9SnBxs7z47eaiKWE9gLkemQ9qFuVB6a4PCj5WysPh4E2OP+1XYvBP8VTs7lu8Dr +2fBmi76kvqBTrSy/KSmPSvZBshPbfAqKtJ1J3bV6GXs/MEzYGM0pHIBYmNaaBEtMdQOt+D 9xiVkC3r1rTB67G/Ukm2X3todpBMjC02+GByQPdnZ0Mu55Gj7m4VAWBfeccfOr4eQWtnZLO CHz577w657vFQjAXjduh3PNgvT8gH4uEyM05z/1B/H+5u/SRFfFj4hl/jVy8w7KK2b9Y4bp h2Or+0FeK7SmxVXAdxWQvxzj5lTd2WFLPG40FIVxW5QTo8dIhG/9V81f8BqbtSQW0juFfSD pOoK2F7xR6l8MBUlct37Ldt/rPvZv1Ig3s9Oq0S4d492kZW4PyBH923S6eIm9PpA2LBv65t mZmSIcN4gJwUf4FZIaVKGqWC80iMWfXHeibs8uDx7Ygqdqc9ANMZpq1YqsNap4nhmMfxbYn E5KjMkGNK3+SLyTbPQLF7k9JubvRDb6AW2+bKptOEGmXi10uAN295hmZ97Te4LPfv40i1Nm 0VuGG9E21LbjRc+MxfTVii/SZd255o6Wg1W8ObO16pFl812ZnRH87+tYWMIebH1e+6UFTjL H+BpaGao5BtJoz434td//wQtW4nmBwAUnX28rGL9RVmaehdMmC53jBVyVAG1THlY4wy3NfR gMxnieMSQG07voW2eqBY7zRTmsWHOVBXhcA5ORE7umDsQpSC13yFvcAhrGMTOLpj4ZKAAwK D/OVHVsKsPZTBFCcC8UxE/LPDrXUYfzcF6gnTiEskWkwnC+nRyLI63tFeRxa9Zt76tylH+H G/jj8y0BFfgeL/vZoJS45WRbtgQS6B5d+s2jYi3Dn5Q3b9LBXOxxIlFKhLFnYLE9LuamuGs o+qi/SXsiHocKkTG1gINnDJB3GkPZsrSEx8G25lz/3vdv0wsElCS45uA6215l6ZRx9vUiVT 1wV3OQyuCbUOy0P0aqlVex9EKnwwBeCOGL2BtkbQzJOPQkJq7P X-QQ-XMRINFO: NS+P29fieYNwqS3WCnRCOn9D1NpZuCnCRA== 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 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 --- 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 c3209b0f4678..d92e93875793 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 beab5b695a6e..c4761526ba0a 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"); -- 2.53.0