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 EF90F2FDC5E for ; Mon, 8 Jun 2026 07:11:18 +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=1780902681; cv=none; b=Gacm3+0rdBGIO8wa6VHC1z5+2MMAsQ08E67GPo1ySQrLw5Mlj4q+ZHx72HY9AXoZzMSaeGpEsuxynLeEKeGydHuO103bViyIYq6IVxxCuc7m0s2G2blM3Bo51iYWWP03ykxBjHKqon588Oj0Ql1KNrm2IbcfoP/4B0eNup/ALMM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780902681; c=relaxed/simple; bh=MSfgcxmqx7xmt/pRNG8ZxLZnSJgVAoBcbyg9iN/r/eA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References; b=VedlIEnU6GFC49uKYWbbnc6nWu4Usa+ewEwSz4nz9af+bPtQGilDxrs2eOeAojDWaLErxUBeUA8lEzZhv3IgS2b5hjWPz+DCOO80ime1hllhC2kMnpkw9j94fy/948R+cFp0+8BFn7q7RpaOITsLU0MLKhW4R1zDB0CXlN3fAWI= 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=eEr8jUbb; 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="eEr8jUbb" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=airkyi.com; s=altu2504; t=1780902646; bh=ljRwFnTKGUTVqgA3Lm3Ra0/E+sWBd9mHLzzNshq9MTA=; h=From:To:Subject:Date:Message-Id; b=eEr8jUbbYLtbt462PGeUT1v2Ij2hxcMmJr70MGJuO1rJ604ztZsMacf/povZ8/8zj ZldN86BJrb2Mqb3nUTX8qDOXPC4ClPb3EKqU2kX5WVjKi8JgVe1/puqtGVFm/ZxGwl 7zFfncvWjn9niArK01rkRYuAUr2WNIE8910WZnT4= X-QQ-mid: esmtpsz10t1780902501t3845a4dd X-QQ-Originating-IP: SZa8h0Tea+RZoA9s470z5Mkgz2dnQBWejt+O90a4Yvw= Received: from DESKTOP-8BT1A2O.localdomain ( [58.22.7.114]) by bizesmtp.qq.com (ESMTP) with id ; Mon, 08 Jun 2026 15:08:15 +0800 (CST) X-QQ-SSF: 0000000000000000000000000000000 X-QQ-GoodBg: 0 X-BIZMAIL-ID: 14132758870929029715 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: Nicolas Frattaroli , Sebastian Reichel , 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: Mon, 8 Jun 2026 15:08:01 +0800 Message-Id: <20260608070805.88-2-kernel@airkyi.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20260608070805.88-1-kernel@airkyi.com> References: <20260608070805.88-1-kernel@airkyi.com> X-QQ-SENDSIZE: 520 Feedback-ID: esmtpsz:airkyi.com:qybglogicsvrgz:qybglogicsvrgz6b-0 X-QQ-XMAILINFO: MpJmQ90V4eWU6cn+qBOYfxIb3xzULALuXKsF8sfmUVIbYQTDD0jqg66e dtnvQYsqnS4+P3OAlJL69b+ETmKrXD6fnYo6cXRDi05Z4Dq63rFUy68PSh5FtQ5IwAmi+Pw AVBrYkGWOJz36cX4PWQELby0FlWDqEcij9FEOSQzQ0LuDt+m6B/0WmQaY/0Fm4Jucq3UWgo toSDfwADTn0PL38Xgni2AdBnxGoz5UigNgu8ny4+grxJj4NSdZzX5Z/gdioxpUi1cSHkyou +B8d7jAmyqiNVs0SELu2jVjTZgY4bPjdPcxZKT2mZy8FL4kVdLO5cswFAQlHgtRDlT2/9A4 5nlRP/IbuEc0jbSpr2rw9ifVKzZRZtdFAr4PKmIXKrQpy+d1GjMHYrn1F6ercHKaAwr0FfM Nqf+OxnPKie19yWBArvfLPuEFIh+BgzkF9kLxMHkwm/r2V9sFmXA+wx1sIn3XKv9XCwLUok 6D4twRqNYeLGOVILW+DftwLV7eeS4ExUx0gNrOI3bTDo2JhcycjWC6nT4BXVgm9kzS6zFQx Idinta2nVAvY09zQuQSiOFlAGdrKaKs1TjSH0QhZI2R4PrgHWpahQVMLgdX3AtoC3tYOx2q 2Sybd7NRm/E+Boi7d3qzCFXGF3Ucwy9eV5QJAocsBJ9M1CB9u39fi4pmyjoKz7dLxFlmVIj kd668zmgyOkba0AKKdFUxMyB16H0sQ+9Ml/adII6vtFsnXd61NW723I/mWpVWz5+6FWQwUn EcdCSeDr0dNSAJ3KCPXknfEYQvQmwHRF/I8upP7aKBCjeIaEbw8YN13cQog0jWDClDpobBe ImfQzqICRkSdTVukOX/CwaTRQeGApTdKtp079jP9h3czxaGvEPKwmLusin+NuR2juDNiKwr W0bipesS1GFoCG8wUk8MNNRFdq2zdUORfXUFdA3aXYupLZ97idFYTMOTXeeM4EvqgBQY3zo x4LOnuRxxDTc9Pq5iK/eoJ29SU48RIotyct1hx0OPAHpqSetb4twBKRNbUxyFgW2BNchrVq gI8xSQiFKbCr+DQ/HxD/0Anelgddba42V93DXKSQ== 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 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 --- 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 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..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"); -- 2.54.0