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 738E9CCD1AB for ; Thu, 23 Oct 2025 03:31:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: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:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=umNcsJfQXn20u9b8R1M4KUZg1ShG0gK3GbHIbkBThtI=; b=dNuL7GPTg2YUIQsCbxAPrOsCZO yFqbe5rGAnyaTZIoUobaMmBnb7Za/H3jSWulPYYCvYyPqMes7ytE5Yec62r83DOjDHr0QWwf2d3e9 ar4Wl+cFY9IzHriu/pQ7ip9R07qH/ph98vQYn788ANp+F/UdTclzhk6pt4t38Ucc9mYkuc+KUqrzy vOjaj3nrL8dmfyvLj5/klyWRKn8+unUHdiICjQZ4LJx2OnPCRBo+Wo0xXD06USyVxAPKNwNpDaJf9 PxCcCS+HkEV3g8aLwCTTr5x1wdQ7M4LsFEvSgnbZrRMcxomhe1Lj78Jpmr/aOSFy5ZVsorLN/L9qw aD6I2Dfw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vBm2x-00000004w71-1360; Thu, 23 Oct 2025 03:31:27 +0000 Received: from smtpbgau1.qq.com ([54.206.16.166]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vBm2t-00000004vn0-2ylg; Thu, 23 Oct 2025 03:31:25 +0000 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251022_203124_176551_60EED103 X-CRM114-Status: GOOD ( 16.88 ) 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 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 +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/Makefile 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-$(CONFIG_DRM_AUX_BRIDGE) += aux-bridge.o obj-$(CONFIG_DRM_AUX_HPD_BRIDGE) += aux-hpd-bridge.o +obj-$(CONFIG_DRM_AUX_TYPEC_DP_HPD_BRIDGE) += aux-hpd-typec-dp-bridge.o obj-$(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..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 = (struct typec_altmode *)data; + + if (action != TYPEC_ALTMODE_REGISTERED) + goto done; + + if (alt->svid != 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 = { + .notifier_call = 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"); -- 2.49.0