From patchwork Mon Jan 23 12:23:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jagan Teki X-Patchwork-Id: 13112018 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 78B39C38142 for ; Mon, 23 Jan 2023 12:23:45 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id AA0B110E351; Mon, 23 Jan 2023 12:23:44 +0000 (UTC) Received: from mail-pl1-x62b.google.com (mail-pl1-x62b.google.com [IPv6:2607:f8b0:4864:20::62b]) by gabe.freedesktop.org (Postfix) with ESMTPS id 30BCC10E350 for ; Mon, 23 Jan 2023 12:23:43 +0000 (UTC) Received: by mail-pl1-x62b.google.com with SMTP id jl3so11187256plb.8 for ; Mon, 23 Jan 2023 04:23:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amarulasolutions.com; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=MmdIsQUt1eQ5Mg1zNk3b8g7tN9qiVqUYt0El2a9KJYU=; b=ryMoHDS3aaJoj91vLcOf/+C4iAOKKGvgH4Vl3QQPZXUJ7ZDUPFbqnFuv0h1ehKk3mj bP/+LcDeismbumKBmhozB6X3PvhH/+pd5cqNI2HCSr1S+2kD9byHSWmEpuxkzu6/nWeY d23/KVQ5QNH/rGX4264g1iExAdWVN0g9q6c20= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=MmdIsQUt1eQ5Mg1zNk3b8g7tN9qiVqUYt0El2a9KJYU=; b=IPPo5FUMcW0MQWG7ItRA4pof1jEPhE0NGfBC+ovZBDj1DHeazg7gbThvqJhv4TAMKn cH8dNU8RN77aHz++BRPXISrdxqKE2uxitwEyfVLB0qNgPAKIGpCLRp6FehROINqetNKE Ud/mnPK7Ph3HQGym+RvJEkGsYQUcRqI63Xk/Hj8ejVyMPXjAOTe6ZsM/d/qRTUUeQUrj lRwOFih034dAHtbltJixH1w4VlumuCeMHVXKNl4H1BqkhFM3Pb4DESryrG0PvQJ16kEa EZt0iH+VZ42kyX0fT7R1LlAYJkdhJVl2P0iZNcxQHSv+mT0zkI+TTk7Xw9cyobAdj+Qk uFVg== X-Gm-Message-State: AFqh2ko0ypQLHtyHRO8UH+tZnlBrgGwY8M8SjiFm2qs6BdaRICZ/Mavu qhF85NmyGSXZgIxJ43jhI5uaRg== X-Google-Smtp-Source: AMrXdXvBKbe2cin/lj0o8+udjmil+R8KxV+pgkqGzf4yNnxHQSRSAu3C4KlT6xqMomoeSdcUUokPlw== X-Received: by 2002:a17:902:b209:b0:194:7aae:f272 with SMTP id t9-20020a170902b20900b001947aaef272mr24074654plr.30.1674476622742; Mon, 23 Jan 2023 04:23:42 -0800 (PST) Received: from localhost.localdomain ([2405:201:c00a:a15f:2279:f361:f93b:7971]) by smtp.gmail.com with ESMTPSA id w10-20020a170902e88a00b001960806728asm1291811plg.88.2023.01.23.04.23.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 23 Jan 2023 04:23:42 -0800 (PST) From: Jagan Teki To: Andrzej Hajda , Inki Dae , Marek Szyprowski , Joonyoung Shim , Seung-Woo Kim , Kyungmin Park , Frieder Schrempf , Fancy Fang , Tim Harvey , Michael Nazzareno Trimarchi , Adam Ford , Neil Armstrong , Robert Foss , Laurent Pinchart , Tommaso Merciai , Marek Vasut Subject: [PATCH v11 01/18] drm: of: Lookup if child node has DSI panel or bridge Date: Mon, 23 Jan 2023 17:53:02 +0530 Message-Id: <20230123122319.261341-2-jagan@amarulasolutions.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230123122319.261341-1-jagan@amarulasolutions.com> References: <20230123122319.261341-1-jagan@amarulasolutions.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-samsung-soc@vger.kernel.org, Matteo Lisi , dri-devel@lists.freedesktop.org, NXP Linux Team , linux-amarula , linux-arm-kernel@lists.infradead.org, Jagan Teki Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Devices can also be child nodes when we also control that device through the upstream device (ie, MIPI-DCS for a MIPI-DSI device). Unlike the drm_of_find_panel_or_bridge helper it requires a special case to lookup a child node of the given parent that isn't either port or ports. Lookup for a child DSI node of the given parent that isn't either port or ports. If it is found then it will directly find the panel or bridge otherwise lookup for the child node with a given port and endpoint number as drm_of_find_panel_or_bridge does. Supporting this feature via existing drm_of_find_panel_or_bridge found several issues while handling usecases. Here is the previously failed attempt of similar and the same has been reverted later. commit <80253168dbfd> ("drm: of: Lookup if child node has panel or bridge") So, add a separate helper to handle this DSI use case. Example OF graph representation of DSI host, which has port but not has ports and has child panel node. dsi { compatible = "allwinner,sun6i-a31-mipi-dsi"; #address-cells = <1>; #size-cells = <0>; port { dsi_in_tcon0: endpoint { remote-endpoint = ; }; panel@0 { reg = <0>; }; }; Example OF graph representation of DSI host, which has ports but not has port and has child panel node. dsi { compatible = "samsung,exynos5433-mipi-dsi"; #address-cells = <1>; #size-cells = <0>; ports { #address-cells = <1>; #size-cells = <0>; port@0 { reg = <0>; dsi_to_mic: endpoint { remote-endpoint = <&mic_to_dsi>; }; }; }; panel@0 { reg = <0>; }; }; Example OF graph representation of DSI host, which has neither a port nor a ports but has child panel node. dsi0 { compatible = "ste,mcde-dsi"; #address-cells = <1>; #size-cells = <0>; panel@0 { reg = <0>; }; }; Cc: Maxime Ripard Cc: Laurent Pinchart Cc: Linus Walleij Cc: Maarten Lankhorst Signed-off-by: Jagan Teki --- Changes for v11: - drop extra line Changes for v10: - new patch drivers/gpu/drm/drm_of.c | 112 ++++++++++++++++++++++++++++++++------- include/drm/drm_of.h | 12 +++++ 2 files changed, 104 insertions(+), 20 deletions(-) diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c index 7bbcb999bb75..e165951e3545 100644 --- a/drivers/gpu/drm/drm_of.c +++ b/drivers/gpu/drm/drm_of.c @@ -216,6 +216,35 @@ int drm_of_encoder_active_endpoint(struct device_node *node, } EXPORT_SYMBOL_GPL(drm_of_encoder_active_endpoint); +static int of_drm_find_panel_or_bridge(struct device_node *remote, + struct drm_panel **panel, + struct drm_bridge **bridge) +{ + int ret = -EPROBE_DEFER; + + if (panel) { + *panel = of_drm_find_panel(remote); + if (!IS_ERR(*panel)) + ret = 0; + else + *panel = NULL; + } + + /* No panel found yet, check for a bridge next. */ + if (bridge) { + if (ret) { + *bridge = of_drm_find_bridge(remote); + if (*bridge) + ret = 0; + } else { + *bridge = NULL; + } + } + + of_node_put(remote); + return ret; +} + /** * drm_of_find_panel_or_bridge - return connected panel or bridge device * @np: device tree node containing encoder output ports @@ -238,7 +267,6 @@ int drm_of_find_panel_or_bridge(const struct device_node *np, struct drm_panel **panel, struct drm_bridge **bridge) { - int ret = -EPROBE_DEFER; struct device_node *remote; if (!panel && !bridge) @@ -259,30 +287,74 @@ int drm_of_find_panel_or_bridge(const struct device_node *np, if (!remote) return -ENODEV; - if (panel) { - *panel = of_drm_find_panel(remote); - if (!IS_ERR(*panel)) - ret = 0; - else - *panel = NULL; - } + return of_drm_find_panel_or_bridge(remote, panel, bridge); +} +EXPORT_SYMBOL_GPL(drm_of_find_panel_or_bridge); - /* No panel found yet, check for a bridge next. */ - if (bridge) { - if (ret) { - *bridge = of_drm_find_bridge(remote); - if (*bridge) - ret = 0; - } else { - *bridge = NULL; - } +/** + * drm_of_dsi_find_panel_or_bridge - return connected DSI panel or bridge device + * @np: device tree node containing encoder output ports + * @port: port in the device tree node + * @endpoint: endpoint in the device tree node + * @panel: pointer to hold returned drm_panel + * @bridge: pointer to hold returned drm_bridge + * + * Lookup for a child DSI node of the given parent that isn't either port + * or ports. If it is found then it will directly find the panel or bridge + * otherwise lookup for the child node with a given port and endpoint number + * as drm_of_find_panel_or_bridge does. + * + * Lookup a given child DSI node or a DT node's port and endpoint number, + * find the connected node and return either the associated struct drm_panel + * or drm_bridge device. Either @panel or @bridge must not be NULL. + * + * Returns zero if successful, or one of the standard error codes if it fails. + */ +int drm_of_dsi_find_panel_or_bridge(const struct device_node *np, + int port, int endpoint, + struct drm_panel **panel, + struct drm_bridge **bridge) +{ + struct device_node *remote; + + if (!panel && !bridge) + return -EINVAL; + if (panel) + *panel = NULL; + /** + * Devices can also be child nodes when we also control that device + * through the upstream device (ie, MIPI-DCS for a MIPI-DSI device). + * + * Lookup for a child node of the given parent that isn't either port + * or ports. + */ + for_each_available_child_of_node(np, remote) { + if (of_node_name_eq(remote, "port") || + of_node_name_eq(remote, "ports")) + continue; + + goto of_find_panel_or_bridge; } - of_node_put(remote); - return ret; + /* + * of_graph_get_remote_node() produces a noisy error message if port + * node isn't found and the absence of the port is a legit case here, + * so at first we silently check whether graph presents in the + * device-tree node. + */ + if (!of_graph_is_present(np)) + return -ENODEV; + + remote = of_graph_get_remote_node(np, port, endpoint); + +of_find_panel_or_bridge: + if (!remote) + return -ENODEV; + + return of_drm_find_panel_or_bridge(remote, panel, bridge); } -EXPORT_SYMBOL_GPL(drm_of_find_panel_or_bridge); +EXPORT_SYMBOL_GPL(drm_of_dsi_find_panel_or_bridge); enum drm_of_lvds_pixels { DRM_OF_LVDS_EVEN = BIT(0), diff --git a/include/drm/drm_of.h b/include/drm/drm_of.h index 10ab58c40746..7a97157c1fa0 100644 --- a/include/drm/drm_of.h +++ b/include/drm/drm_of.h @@ -47,6 +47,10 @@ int drm_of_find_panel_or_bridge(const struct device_node *np, int port, int endpoint, struct drm_panel **panel, struct drm_bridge **bridge); +int drm_of_dsi_find_panel_or_bridge(const struct device_node *np, + int port, int endpoint, + struct drm_panel **panel, + struct drm_bridge **bridge); int drm_of_lvds_get_dual_link_pixel_order(const struct device_node *port1, const struct device_node *port2); int drm_of_lvds_get_data_mapping(const struct device_node *port); @@ -99,6 +103,14 @@ static inline int drm_of_find_panel_or_bridge(const struct device_node *np, return -EINVAL; } +static inline int drm_of_dsi_find_panel_or_bridge(const struct device_node *np, + int port, int endpoint, + struct drm_panel **panel, + struct drm_bridge **bridge) +{ + return -EINVAL; +} + static inline int drm_of_lvds_get_dual_link_pixel_order(const struct device_node *port1, const struct device_node *port2)