From nobody Sat Feb 7 20:39:36 2026 Received: from smtpbgsg1.qq.com (smtpbgsg1.qq.com [54.254.200.92]) (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 BD8DF2DC777 for ; Thu, 23 Oct 2025 03:32:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=54.254.200.92 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761190362; cv=none; b=ogi5VUDix+jpWOKdaNLBNuKUaQ89KFJZ/JGawjW0hprmCc8MiTgEUWBa9ytofp/dDlFL9uzihaJGkLTBjRlmbQmyFTvWaDZ5BKMzQzQfzI9vnPQQGL4utpwQcofgjWzER+S1hQH8A5VQlZbKBaLGNUnuEg0MRoidjIKYSur4Rps= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761190362; c=relaxed/simple; bh=VHSKA2HFsM9+jjFn1th+KI+Eh4o3xbpE+Vm5UfGT46M=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References; b=jP7UqqbKQCH1UcAkmcWNevbzTc3U3wjybINpR087cvLv4ZSePMOl1SRfaNgZO3/I8L6f4IrPwIVj7M4cgcqlVymn9a69n6TB/mTC7O5EwZfvIp1SyOJEuG7iHN3/cfbaphv+YIXsychUfCnrs38WQnNecIJbl9JIxL1uoFKI84s= 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=OXkT7nnh; arc=none smtp.client-ip=54.254.200.92 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="OXkT7nnh" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=airkyi.com; s=altu2504; t=1761190234; bh=umNcsJfQXn20u9b8R1M4KUZg1ShG0gK3GbHIbkBThtI=; h=From:To:Subject:Date:Message-Id; b=OXkT7nnhBVPpNBUhTmED0A8BDwM39R6EvAktks43nN8Htg5clFG0Nac3yuGHSjq4h msBCY1Fnag+1s1uCKTQ5XkTruWcoIJMWHBGT/xsrKMkNkloTBF+DUFZS7RtREC4STP vm7oD1UdQ5c7a1EU49AaAfVNF/MbW0rR/Pynrzfw= X-QQ-mid: esmtpsz16t1761190231tebd0ea05 X-QQ-Originating-IP: lmB1WZeKvtf5VM4hJL0jYLeppT9A2VeZOLIbFh5pRJk= Received: from DESKTOP-8BT1A2O.localdomain ( [58.22.7.114]) by bizesmtp.qq.com (ESMTP) with id ; Thu, 23 Oct 2025 11:30:27 +0800 (CST) X-QQ-SSF: 0000000000000000000000000000000 X-QQ-GoodBg: 0 X-BIZMAIL-ID: 18264625426006429648 From: Chaoyi Chen To: Heikki Krogerus , Greg Kroah-Hartman , Dmitry Baryshkov , 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 , Chaoyi Chen , Dragan Simic , Johan Jonker , Diederik de Haas , Peter Robinson 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 Subject: [PATCH v7 2/9] drm/bridge: Implement generic USB Type-C DP HPD bridge Date: Thu, 23 Oct 2025 11:30:02 +0800 Message-Id: <20251023033009.90-3-kernel@airkyi.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20251023033009.90-1-kernel@airkyi.com> References: <20251023033009.90-1-kernel@airkyi.com> X-QQ-SENDSIZE: 520 Feedback-ID: esmtpsz:airkyi.com:qybglogicsvrsz:qybglogicsvrsz4a-0 X-QQ-XMAILINFO: MI8xiyr9SLuAXVPvvA1fD2USjttncnOPXxABKJaZLl1ydENCdNmpS63R /3diLaEzy1tctr5bPdOlG6ijcyH7URCdTO7f0CgLK30QUnJsul2FUH/Yl61mmhWQrGH2R/C 3XZQx9IX+QypkmlztuZxvqGhKXgT+S6dl6vGyakfhW7zNdqwAjXdfy6IUv7DvfavhETi/aH 1E2ov4ryHoZ7pfbG2/Ql64KTxF5sAOoRublXLVqHL7lG/MvsfuW2wupYlgkTfE0xo3c2uWo gwD3OTUpQQmil5oXLn8cl4ZvwBsaxjPZmKgcPO9ki17/xN3uve6pU70f7vzTayO+JulfWJJ MvnH24f+F9xYo379DYa/xiwJyHY1V9f53hXWpZbphFlEty12+5dfNzEYvnE8gVbupjgF+ZN iS9qya1raE0GMR8Uw56f22XYaUatjLH9Ccfk+ZXwnqK1/+wBUKJ4a1dfGJKAyFnawOVJqQn 4lUQb+jcdCPalhB/Uf34w0duWqIlVhWfBbIAN5uK5uv4UunTvGaeP6U0uxxFPLF2eLbXmcz 7B0BAPTjdwV9HeQLjeqDXizRGeYmBHZNwLSUcGLR5w0LoqII2CeKD0khkWqyM4TL+9Ue0tF 6toF7YGbwOlhXRQDTXqmRRk9VKE89ZgmLW6mdGDAwNCFw1bXJ2FtbO8t8WYd7qIsIFU0/T4 HU5lbyMlMHgQWEmYa3uyZTGjwFx23HM8YQ/iua5i0iGIDs7/Fd+8cR/aqtkkXQ7ffOYv/6g vXj0As+FBqvRfoIoNHsdlIZ6VA/4wGidqlN1RB/6X/Tv5cFDi20KAzzvSMpl5s0I6MIFE0U rOU7pYiTVWWmIQbza04Z+E+lVPmti/F8uS3j38tyAvnveXB1APrAOhPqZ/FGaP0rQKV3rM9 9GjC2D9Qy77rCCA3wpP6Pq6FaIWdtQMiwxxD7gYjqBkCq/doN46EvwlSyjUoqngRdAgNi3C oGHX/GG55I6wCgreezRdIYkWaheljyOGFgbZ8aR3TLOdsAjAMPCLdmIqNhc+VlXHziButfr QWGByxWagGAOyN8dO9zjfqBw5c9z4= X-QQ-XMRINFO: OWPUhxQsoeAVDbp3OJHYyFg= X-QQ-RECHKSPAM: 0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Chaoyi Chen Several USB-C controller drivers have already implemented the DP HPD bridge function provided by aux-hpd-bridge.c, but there are still some USB-C controller driver that have not yet implemented it. This patch implements a generic DP HPD bridge based on aux-hpd-bridge.c, so that other USB-C controller drivers don't need to implement it again. Signed-off-by: Chaoyi Chen --- drivers/gpu/drm/bridge/Kconfig | 11 ++++ drivers/gpu/drm/bridge/Makefile | 1 + .../gpu/drm/bridge/aux-hpd-typec-dp-bridge.c | 51 +++++++++++++++++++ 3 files changed, 63 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 b9e0ca85226a..9f31540d3ad8 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -33,6 +33,17 @@ config DRM_AUX_HPD_BRIDGE menu "Display Interface Bridges" depends on DRM && DRM_BRIDGE =20 +config DRM_AUX_TYPEC_DP_HPD_BRIDGE + tristate "TypeC DP HPD bridge" + depends on DRM_BRIDGE && OF && TYPEC + select DRM_AUX_HPD_BRIDGE + help + Simple USB Type-C DP bridge that terminates the bridge chain and + provides HPD support. + + If the USB-C controller driver has not implemented this and you need + the DP HPD support, say "Y" or "m" here. + config DRM_CHIPONE_ICN6211 tristate "Chipone ICN6211 MIPI-DSI/RGB Converter bridge" depends on OF diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makef= ile index 245e8a27e3fc..e91736829167 100644 --- a/drivers/gpu/drm/bridge/Makefile +++ b/drivers/gpu/drm/bridge/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_DRM_AUX_BRIDGE) +=3D aux-bridge.o obj-$(CONFIG_DRM_AUX_HPD_BRIDGE) +=3D aux-hpd-bridge.o +obj-$(CONFIG_DRM_AUX_TYPEC_DP_HPD_BRIDGE) +=3D aux-hpd-typec-dp-bridge.o obj-$(CONFIG_DRM_CHIPONE_ICN6211) +=3D chipone-icn6211.o obj-$(CONFIG_DRM_CHRONTEL_CH7033) +=3D chrontel-ch7033.o obj-$(CONFIG_DRM_CROS_EC_ANX7688) +=3D 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..2235b7438fe9 --- /dev/null +++ b/drivers/gpu/drm/bridge/aux-hpd-typec-dp-bridge.c @@ -0,0 +1,51 @@ +// SPDX-License-Identifier: GPL-2.0+ +#include +#include +#include +#include + +#include + +static int drm_typec_bus_event(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct typec_altmode *alt =3D (struct typec_altmode *)data; + + if (action !=3D TYPEC_ALTMODE_REGISTERED) + goto done; + + if (alt->svid !=3D USB_TYPEC_DP_SID) + goto done; + + /* + * alt->dev.parent->parent : USB-C controller device + * alt->dev.parent : USB-C connector device + */ + 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 =3D { + .notifier_call =3D drm_typec_bus_event, +}; + +static void drm_aux_hpd_typec_dp_bridge_module_exit(void) +{ + typec_unregister_notify(&drm_typec_event_nb); +} + +static int __init drm_aux_hpd_typec_dp_bridge_module_init(void) +{ + typec_register_notify(&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"); --=20 2.49.0