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a="77553073" X-IronPort-AV: E=Sophos;i="6.20,248,1758610800"; d="scan'208";a="77553073" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by fmvoesa103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Dec 2025 05:19:08 -0800 X-CSE-ConnectionGUID: 6hnV95oCRRiK6KPTByZfvQ== X-CSE-MsgGUID: HfWUZWD7SnmB6CaIbu9f3w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.20,248,1758610800"; d="scan'208";a="199943225" Received: from rfrazer-mobl3.amr.corp.intel.com (HELO kuha) ([10.124.220.149]) by fmviesa004.fm.intel.com with SMTP; 04 Dec 2025 05:18:57 -0800 Received: by kuha (sSMTP sendmail emulation); Thu, 04 Dec 2025 15:18:48 +0200 Date: Thu, 4 Dec 2025 15:18:48 +0200 From: Heikki Krogerus To: Chaoyi Chen Cc: 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 , Chaoyi Chen , Dragan Simic , Johan Jonker , Diederik de Haas , Peter Robinson , 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: Re: [PATCH v11 03/11] drm/bridge: Implement generic USB Type-C DP HPD bridge Message-ID: References: <20251128020405.90-1-kernel@airkyi.com> <20251128020405.90-4-kernel@airkyi.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251128020405.90-4-kernel@airkyi.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251204_051909_370337_3EC44A29 X-CRM114-Status: GOOD ( 16.61 ) 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 Hi, Fri, Nov 28, 2025 at 10:03:57AM +0800, Chaoyi Chen kirjoitti: > 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..94be3d5f69e9 > --- /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 > + > +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; > + > + if (is_typec_partner_altmode(&alt->dev) || alt->svid != USB_TYPEC_DP_SID) > + goto done; There are also plug altmodes. Just make sure it's a plug altmode. if (!is_typec_plug_altmode(&alt->dev) || 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) > +{ > + 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"); thanks, -- heikki