From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtpout-03.galae.net (smtpout-03.galae.net [185.246.85.4]) (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 645FD36215B for ; Fri, 19 Jun 2026 14:09:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.246.85.4 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781878146; cv=none; b=ng5gH3eKJ8oW/yfbuYhxUZNxHP3+1i1USqw0a57GVPBKrNxu5/rHjn9cx7hvcAeM9/nrMh3B1XFhRdEjhIFhGC+FoLYeKFuHXOejomcoY1PiIN7snjAMFDL8peLHSHW0NwEWDk2RB/pe6n0xJfyx91GMCCMeJO3x3Djr85WgJPk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781878146; c=relaxed/simple; bh=n3ZlMvC7xC3v+SUcrKoHWFkah9+5fVpMgiRokB8Ga+8=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Im+OiaQUTAHBg9NaCUkHuUY6Hv7xcfAU2dTR3ye58AEwiAw+UHeqCJBnlRLEWDNipFFriNqcVgw4WLaiWxbyxPkYqT9Vqo4wrbIE+kHpwu4LPZzDn9n+c7y6LXtMIJcxrMChTyZwwj+uMJ9gWn90J9ffYB6aksL2fOm9vRiN/Zo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=ZncerNAw; arc=none smtp.client-ip=185.246.85.4 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="ZncerNAw" Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-03.galae.net (Postfix) with ESMTPS id 15D234E42FC2; 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 Precedence: bulk X-Mailing-List: linux-kernel@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: <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 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