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 B198FCD98F2 for ; Fri, 19 Jun 2026 14:09:18 +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:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=TO+8vf61kNju4PwtuIv9SwXy8zceN+AIryuGq2GsET8=; b=VLMqhxUxTDM9PdKzR5RQGHY70n MXlNv0GacY92caDC3+x0UPKUEEFh1ropDlmsCVDrFjasB54qM1BI+v/FquBPixz0oka2RTYEG6BZX 9MpApqbIKXuoZtzNOSTXYo2O34efLhgVp2/EKP9v3rcRgRDWT30xofLdgtUXzwRTnEA6VpT/bE9Zm 4f1L+gOvWnvAZVrWEHNuLAyn9999mWCYeD2+ef8Nrtl0K7VGLdzGNAGfNR+MlM4ucg5rkm88ROIL3 Qjf9iJHD+d088ZEzbpw6MBGQty2fEHsZlTc/1tz/vOxZRmeoxUbJS61yOM7koOCAviqo5T7xJ03+g 9LIAeV3w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1waZu8-00000002XHU-2zBF; Fri, 19 Jun 2026 14:09:08 +0000 Received: from smtpout-02.galae.net ([185.246.84.56]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1waZu5-00000002XEr-2sH2; Fri, 19 Jun 2026 14:09:06 +0000 Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-02.galae.net (Postfix) with ESMTPS id 15E6C1A3A20; Fri, 19 Jun 2026 14:09:04 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id DD1DA601AD; Fri, 19 Jun 2026 14:09:03 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 51781106C8234; Fri, 19 Jun 2026 16:08:59 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1781878142; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=TO+8vf61kNju4PwtuIv9SwXy8zceN+AIryuGq2GsET8=; b=ZncerNAwoGtviiVsHNj7vZKGV3N7lfq5zDOhto3C1/blrMQ53z2GWeVHoX7vP7+4dIPbC/ +Jeyo+IJzxumTF1XTcTSfOrZ6f1DBrPQJBDPdepkjWx8QF5FfT8sHPIZaOCo0AFL0Oa+nB yqft7kAqpDUipMtTE7sOx5MMRPMhHrV5RRhHB3leE485rWqbyZxMMh5XLn6ohPAnKBZC2A /w7Sh5kA5TrE37Xqkwgeai/pWQz3QKwgQYY/MN12t4Ihw2bLsKtMvp2XDsnE6ddMCD5Yxd M/+xKmasavxYoc75xlouIbBOGat6wmKDUaJrQdxs3n/5ZmDvAn52p8Sj+WzMaw== From: Kory Maincent Date: Fri, 19 Jun 2026 16:08:45 +0200 Subject: [PATCH RFC v2 3/4] drm/bridge: Wire drmm_connector_dp_init() via new DRM_BRIDGE_OP_DP flag MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260619-feat_link_cap-v2-3-a3dec4c02ad9@bootlin.com> References: <20260619-feat_link_cap-v2-0-a3dec4c02ad9@bootlin.com> In-Reply-To: <20260619-feat_link_cap-v2-0-a3dec4c02ad9@bootlin.com> To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Jani Nikula , Rodrigo Vivi , Joonas Lahtinen , Tvrtko Ursulin , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Chun-Kuang Hu , Philipp Zabel , Matthias Brugger , AngeloGioacchino Del Regno , Dmitry Baryshkov , Daniel Stone Cc: Thomas Petazzoni , Mark Yacoub , Sean Paul , Manasi Navare , Drew Davenport , Louis Chauvet , Luca Ceresoli , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Kory Maincent X-Mailer: b4 0.15.0 X-Last-TLS-Session-Version: TLSv1.3 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260619_070905_877109_FB1B026C X-CRM114-Status: GOOD ( 14.69 ) 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 Introduce DRM_BRIDGE_OP_DP, a new bridge operation flag for bridges that provide DisplayPort connector operations with link training support. Bridges advertising this flag must fill the dp_link_caps field in struct drm_bridge with their link capabilities. In drm_bridge_connector_init(), when a bridge sets DRM_BRIDGE_OP_DP, use drmm_connector_dp_init() instead of the generic drmm_connector_init() so the connector exposes link training state properties to userspace. This mirrors the existing pattern used for HDMI bridges. Signed-off-by: Kory Maincent --- drivers/gpu/drm/display/drm_bridge_connector.c | 24 ++++++++++++++++++++++++ include/drm/drm_bridge.h | 13 +++++++++++++ 2 files changed, 37 insertions(+) diff --git a/drivers/gpu/drm/display/drm_bridge_connector.c b/drivers/gpu/drm/display/drm_bridge_connector.c index cafa498c38482..6ea4d45e3146b 100644 --- a/drivers/gpu/drm/display/drm_bridge_connector.c +++ b/drivers/gpu/drm/display/drm_bridge_connector.c @@ -108,6 +108,13 @@ struct drm_bridge_connector { * HDMI Audio infrastructure, if any (see &DRM_BRIDGE_OP_HDMI_AUDIO). */ struct drm_bridge *bridge_hdmi_audio; + /** + * @bridge_dp: + * + * The bridge in the chain that implements necessary support for the + * DisplayPort connector infrastructure, if any (see &DRM_BRIDGE_OP_DP). + */ + struct drm_bridge *bridge_dp; /** * @bridge_dp_audio: * @@ -773,6 +780,7 @@ static void drm_bridge_connector_put_bridges(struct drm_device *dev, void *data) drm_bridge_put(bridge_connector->bridge_hdmi_audio); drm_bridge_put(bridge_connector->bridge_dp_audio); drm_bridge_put(bridge_connector->bridge_hdmi_cec); + drm_bridge_put(bridge_connector->bridge_dp); } /** @@ -908,6 +916,15 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm, bridge_connector->bridge_hdmi_audio = drm_bridge_get(bridge); } + if (bridge->ops & DRM_BRIDGE_OP_DP) { + if (bridge_connector->bridge_dp) + return ERR_PTR(-EBUSY); + if (!bridge->dp_link_caps) + return ERR_PTR(-EINVAL); + + bridge_connector->bridge_dp = drm_bridge_get(bridge); + } + if (bridge->ops & DRM_BRIDGE_OP_DP_AUDIO) { if (bridge_connector->bridge_dp_audio) return ERR_PTR(-EBUSY); @@ -996,6 +1013,13 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm, max_bpc); if (ret) return ERR_PTR(ret); + } else if (bridge_connector->bridge_dp) { + ret = drmm_connector_dp_init(drm, connector, + &drm_bridge_connector_funcs, + bridge_connector->bridge_dp->dp_link_caps, + connector_type, ddc); + if (ret) + return ERR_PTR(ret); } else { ret = drmm_connector_init(drm, connector, &drm_bridge_connector_funcs, diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h index 4ba3a5deef9a6..02411e0b71c35 100644 --- a/include/drm/drm_bridge.h +++ b/include/drm/drm_bridge.h @@ -1092,6 +1092,14 @@ enum drm_bridge_ops { * &drm_bridge_funcs->hdmi_clear_spd_infoframe callbacks. */ DRM_BRIDGE_OP_HDMI_SPD_INFOFRAME = BIT(10), + /** + * @DRM_BRIDGE_OP_DP: The bridge provides DisplayPort connector + * operations, including link training support. Bridges that set + * this flag must provide DisplayPort-related information and + * fill the &drm_bridge->dp_link_train_caps link training + * capabilities. + */ + DRM_BRIDGE_OP_DP = BIT(11), }; /** @@ -1267,6 +1275,11 @@ struct drm_bridge { */ void *hpd_data; + /** + * @dp_link_caps: DisplayPort link capabilities + */ + const struct drm_connector_dp_link_caps *dp_link_caps; + /** * @next_bridge: Pointer to the following bridge, automatically put * when this bridge is freed (i.e. at destroy time). This is for -- 2.43.0