From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bali.collaboradmins.com (bali.collaboradmins.com [148.251.105.195]) (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 408DC3B6341; Thu, 30 Apr 2026 22:20:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.251.105.195 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777587643; cv=none; b=G/onLJoU+fttv4zH/JCdHaOc2vNtDwT8A7AeUV44LsQKk1+VDzQZZBGnDKOZNrVNDtOMHxifVKXERJ/qbx9R+V33ETXUwf5EsENnQ0Z69qVwbaw2GbDbItPuGCvdfW+d5FhNaCX31s1O8cnhyed3G09VB0TnWUzu6vkW7wM5Hzo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777587643; c=relaxed/simple; bh=jWWdxoAr7kMuTAhnw7bDZpM00SQYOvDz25/7MfyrqZc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Pj1+Un08hQCpxV/DdLTne9AaEldpQQdRT5m0qj0h3bCIIlIDbsBtDG0Agm5g/Lh392V+fmKoZyR+7QOwUqbqBVM/9XD+llrCpr+S8hetkAvdD1xnug5OEziyxtvjJyHZXj1BUy7QuKCTb2MePYZ7tsmLIwgsCbTUuiz3wgEyxG0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=collabora.com; spf=pass smtp.mailfrom=collabora.com; dkim=pass (2048-bit key) header.d=collabora.com header.i=@collabora.com header.b=fB2UmN0R; arc=none smtp.client-ip=148.251.105.195 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=collabora.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=collabora.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=collabora.com header.i=@collabora.com header.b="fB2UmN0R" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1777587637; bh=jWWdxoAr7kMuTAhnw7bDZpM00SQYOvDz25/7MfyrqZc=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=fB2UmN0RkdD17aFgrOrSniJh+hpFPJ5VF+cIYMWge40eB9glM9/J2kvNYUWOe8DDe f3jEb6cIoEsJbpIdbMweycP6arLc412FFxi5XDrJiiX+kDsKrwXdckooWItjdrBJdd s3tfU9m5E0LIduddmG7jyPlnt0PaET1gczQm1e8TbN8mtzq4TMvkx5kptQ/MwI5bNk MuAxHGyMiEJFRSxccMnJucRDxCKB0B2MnoYwpcEWFppCLja6frRnJc8Q/VSzgtkbD9 i/WVxKYdleBvzvJFnugCYyY5MENJ4KbXcQuea/sX9daISrusiBcIy3TPx6Degz2Dur XQJoxloxVi5SQ== Received: from jupiter.universe (unknown [100.64.1.62]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) (Authenticated sender: sre) by bali.collaboradmins.com (Postfix) with ESMTPSA id B0A4217E157E; Fri, 1 May 2026 00:20:37 +0200 (CEST) Received: by jupiter.universe (Postfix, from userid 1000) id 157C2480038; Fri, 01 May 2026 00:20:37 +0200 (CEST) From: Sebastian Reichel Date: Fri, 01 May 2026 00:20:32 +0200 Subject: [PATCH v2 05/12] drm/bridge: synopsys: dw-dp: Add follow-up bridge support Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260501-synopsys-dw-dp-improvements-v2-5-d7e7f6bac77f@collabora.com> References: <20260501-synopsys-dw-dp-improvements-v2-0-d7e7f6bac77f@collabora.com> In-Reply-To: <20260501-synopsys-dw-dp-improvements-v2-0-d7e7f6bac77f@collabora.com> To: Sandy Huang , =?utf-8?q?Heiko_St=C3=BCbner?= , Andy Yan , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Rob Herring , Krzysztof Kozlowski , Conor Dooley , David Airlie , Simona Vetter , Dmitry Baryshkov , Luca Ceresoli Cc: Cristian Ciocaltea , Damon Ding , Dmitry Baryshkov , Alexey Charkov , dri-devel@lists.freedesktop.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, kernel@collabora.com, linux-arm-kernel@lists.infradead.org, Sebastian Reichel X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=2142; i=sebastian.reichel@collabora.com; h=from:subject:message-id; bh=jWWdxoAr7kMuTAhnw7bDZpM00SQYOvDz25/7MfyrqZc=; b=owJ4nAFtApL9kA0DAAoB2O7X88g7+poByyZiAGnz1bTQsb9vG0AQ72XiT7okzCgQzKb3rRkNV wvTDjDaOyah7IkCMwQAAQoAHRYhBO9mDQdGP4tyanlUE9ju1/PIO/qaBQJp89W0AAoJENju1/PI O/qaBCwP/RmumpuXZh6J0Dzcy/NkNy/U9JB1aBBxqqjKCfK7sGotqh3U+i21ylt+w+GqJPcCLjc dK+9TwypW8cCIFclnx1rUpD1otkICHtT0NNQEPpzJ+XWIsVCUtgGTHjmlfU7IyxVp7EfUeI7S2d 0D3oSKeGrqQ2ryjYluMlcwNLbTP3jUsb9OdE/P9Gt7ZGw6hEdn70ovQC5WyW7F8uYNpPHdyN05b 6JEJPya9di/F5AV2xMhIrejhm+LICtvjuY18dLuHbN756ifjLpf8uckAQ7qR1z7Zlupp2bnow5U pwJ7zw0AGLxpB/I7h4y7zuZPUwHCwK0BGxX3X45A3OPgAMH6KxQ1vX59jYcDwKoi8N0giaNSQEY 0YI+09Wm8LLk0KsL2kZGMskNdC4cU+YFQl7EMuv2DgYD3+pQu1h4U4A8s9LkxUJo0xHYIhTdqSh i8wqEdl1ZLriPAjsEnDsn8b7Jpfci8sHpcZRrV7cmKXhGVtjUADIwtEPCQIhQfu0Q2c3AsIelk5 sAOPFRfNuyJrkruLkDTnRYWhAwUXJ45L5Lmhooynt60fuxJM3H4BtEmY+UaIaJV+8iQWfQJX4yL 3+kbIe+jnP00ZGugsMc6LEbovq34Ik/kIkYnA1g3huNgZvAh1f5luXGcSTWaFNo99ijf4M0k1X7 W9kcP7f/d8DIghFVTWf4wEw== X-Developer-Key: i=sebastian.reichel@collabora.com; a=openpgp; fpr=EF660D07463F8B726A795413D8EED7F3C83BFA9A Add support to use USB-C connectors with the DP altmode helper code on devicetree based platforms. To get this working there must be a DRM bridge chain from the DisplayPort controller to the USB-C connector. E.g. on Rockchip RK3576: root@rk3576 # cat /sys/kernel/debug/dri/0/encoder-0/bridges bridge[0]: dw_dp_bridge_funcs refcount: 7 type: [10] DP OF: /soc/dp@27e40000:rockchip,rk3576-dp ops: [0x47] detect edid hpd bridge[1]: drm_aux_bridge_funcs refcount: 4 type: [0] Unknown OF: /soc/phy@2b010000:rockchip,rk3576-usbdp-phy ops: [0x0] bridge[2]: drm_aux_hpd_bridge_funcs refcount: 5 type: [10] DP OF: /soc/i2c@2ac50000/typec-portc@22/connector:usb-c-connector ops: [0x4] hpd Signed-off-by: Sebastian Reichel --- drivers/gpu/drm/bridge/synopsys/dw-dp.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/bridge/synopsys/dw-dp.c b/drivers/gpu/drm/bridge/synopsys/dw-dp.c index fc4ddb7792d7..ccc55e40e81c 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-dp.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-dp.c @@ -1970,7 +1970,7 @@ struct dw_dp *dw_dp_bind(struct device *dev, struct drm_encoder *encoder, { struct platform_device *pdev = to_platform_device(dev); struct dw_dp *dp; - struct drm_bridge *bridge; + struct drm_bridge *bridge, *next_bridge; void __iomem *res; int ret; @@ -2064,6 +2064,20 @@ struct dw_dp *dw_dp_bind(struct device *dev, struct drm_encoder *encoder, goto unregister_aux; } + next_bridge = devm_drm_of_get_bridge(dev, dev->of_node, 1, 0); + if (IS_ERR(next_bridge)) { + ret = PTR_ERR(next_bridge); + dev_err_probe(dev, ret, "failed to get follow-up bridge.\n"); + goto unregister_aux; + } + + ret = drm_bridge_attach(encoder, next_bridge, bridge, + DRM_BRIDGE_ATTACH_NO_CONNECTOR); + if (ret) { + dev_err_probe(dev, ret, "Failed to attach next bridge\n"); + goto unregister_aux; + } + dw_dp_init_hw(dp); ret = phy_init(dp->phy); -- 2.53.0