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 4D235FF8868 for ; Tue, 28 Apr 2026 15:31:42 +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=VsrC/dIKfRU1a6fTx7g9J6CIwsYbpBRHj18mRvL+Qcw=; b=xtI4kTJl3b7VyQy5LVwT5+YriJ LOt6gutMoR81YhIl83+8NMxW04JrIUWqWCZX73FG++yPhqfhR0mMKsPpXaFA6QjIEdEuIiyROTP6L 8l2j/EtHvabdbnn3Qbi2wUwbo82kGpUTfDymJCGfVqwGEApvNJkpVfBwEWX5xh+c28tZEsYeh5N4c B7wfwPnQiwh5ASZGXkAqOtxxTxR07HNVjU901Bk3q7J73Xfj7R14IaLE+sPcANqpWo2FYqvJ3qFJ+ yywSyNo8TbRQihUYm8BoPhaJI4PEGjCpv23pqD5vh4I5h6rWxtBAwphpC8DcNXXM0Wo4WH2mcHOlF yL90SzFg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wHkPR-00000001jwb-10P2; Tue, 28 Apr 2026 15:31:37 +0000 Received: from smtpout-03.galae.net ([185.246.85.4]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1wHkPM-00000001jtg-1SKS for linux-arm-kernel@lists.infradead.org; Tue, 28 Apr 2026 15:31:33 +0000 Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-03.galae.net (Postfix) with ESMTPS id 9C9324E42B5C; Tue, 28 Apr 2026 15:31:30 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id 7087F601D0; Tue, 28 Apr 2026 15:31:30 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 30C621072861C; Tue, 28 Apr 2026 17:31:25 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1777390288; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=VsrC/dIKfRU1a6fTx7g9J6CIwsYbpBRHj18mRvL+Qcw=; b=uv2RqLZz+nNUGe35Hr9Iu/wF/eHNaGy3J5lftvjtoCUc2n545RGFMN1Ybj2uBpviMkOe10 iySoU1xJCfrm33YABPoyiTbDRx0gv22J/LGTECKaEQT25aD1WSQGPi0LVtedRqRp2ehYGl KA00zR+FntIzJe5J/Wwrku22DEc4HdnmlQAgPt1jfm8pekL0eMxGs4nPe0KLRvRFkq7JBl lXVP/mA4lx31Azu3kdqvLNpBeNxc7k1qFvpgNHal0SL26TNl4eRqcQ7Kq7jZknj+2DSNB2 OwO8ltGvsmvAqekwSmEiXk9JUodnfNb92TgHNlMgquqe3KXgYMX7BHkKjz7F3g== From: Luca Ceresoli Date: Tue, 28 Apr 2026 17:30:51 +0200 Subject: [PATCH v3 02/11] drm/bridge: add of_drm_get_bridge_by_endpoint() MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260428-drm-bridge-alloc-getput-panel_or_bridge-v3-2-a537b5567add@bootlin.com> References: <20260428-drm-bridge-alloc-getput-panel_or_bridge-v3-0-a537b5567add@bootlin.com> In-Reply-To: <20260428-drm-bridge-alloc-getput-panel_or_bridge-v3-0-a537b5567add@bootlin.com> To: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Clark , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , Xinliang Liu , Sumit Semwal , Yongqin Liu , John Stultz , Tomi Valkeinen , Michal Simek Cc: Hui Pu , Ian Ray , Thomas Petazzoni , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, Luca Ceresoli , Dmitry Baryshkov X-Mailer: b4 0.15.2 X-Last-TLS-Session-Version: TLSv1.3 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260428_083132_664835_F51D13AF X-CRM114-Status: GOOD ( 18.80 ) 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 drm_of_find_panel_or_bridge() is widely used, but many callers pass NULL into the @panel or the @bridge arguments, thus making a very partial usage of this rather complex function. Besides, the bridge returned in @bridge is not refcounted, thus making this API unsafe when DRM bridge hotplug will be introduced. Solve both issues for the cases of calls to drm_of_find_panel_or_bridge() with a NULL @panel pointer by adding a new function that only looks for bridges (and is thus much simpler) and increments the refcount of the returned bridge. The new function is identical to drm_of_find_panel_or_bridge() except it: - handles bridge refcounting: uses of_drm_find_and_get_bridge() instead of of_drm_find_bridge() internally to return a refcounted bridge - is simpler to use: just takes no @panel parameter, returns the pointer in the return value instead of a double pointer argument - has a simpler implementation: it is equal to drm_of_find_panel_or_bridge() after removing the code that becomes dead when @panel == NULL Also add this function to drm_bridge.c and not drm_of.c because it returns bridges only. Reviewed-by: Dmitry Baryshkov Signed-off-by: Luca Ceresoli --- Changes in v2: - return the bridge in the return value, not a double pointer --- drivers/gpu/drm/drm_bridge.c | 41 +++++++++++++++++++++++++++++++++++++++++ include/drm/drm_bridge.h | 8 ++++++++ 2 files changed, 49 insertions(+) diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c index cea5babbe99e..8a4141bb7b31 100644 --- a/drivers/gpu/drm/drm_bridge.c +++ b/drivers/gpu/drm/drm_bridge.c @@ -1582,6 +1582,47 @@ struct drm_bridge *of_drm_find_bridge(struct device_node *np) return bridge; } EXPORT_SYMBOL(of_drm_find_bridge); + +/** + * of_drm_get_bridge_by_endpoint - return DRM bridge connected to a port/endpoint + * @np: device tree node containing output ports + * @port: port in the device tree node, or -1 for the first port found + * @endpoint: endpoint in the device tree node, or -1 for the first endpoint found + * + * Given a DT node's port and endpoint number, find the connected node and + * return the associated drm_bridge device. + * + * The refcount of the returned bridge is incremented. Use drm_bridge_put() + * when done with it. + * + * Returns a pointer to the connected drm_bridge, or a negative error on failure + */ +struct drm_bridge *of_drm_get_bridge_by_endpoint(const struct device_node *np, + int port, int endpoint) +{ + struct drm_bridge *bridge; + + /* + * 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 ERR_PTR(-ENODEV); + + struct device_node *remote __free(device_node) = + of_graph_get_remote_node(np, port, endpoint); + if (!remote) + return ERR_PTR(-ENODEV); + + bridge = of_drm_find_and_get_bridge(remote); + if (!bridge) + return ERR_PTR(-EPROBE_DEFER); + + return bridge; +} +EXPORT_SYMBOL_GPL(of_drm_get_bridge_by_endpoint); #endif /** diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h index d6cd0f5af045..c96398460618 100644 --- a/include/drm/drm_bridge.h +++ b/include/drm/drm_bridge.h @@ -1327,6 +1327,8 @@ int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge, #ifdef CONFIG_OF struct drm_bridge *of_drm_find_and_get_bridge(struct device_node *np); struct drm_bridge *of_drm_find_bridge(struct device_node *np); +struct drm_bridge *of_drm_get_bridge_by_endpoint(const struct device_node *np, + int port, int endpoint); #else static inline struct drm_bridge *of_drm_find_and_get_bridge(struct device_node *np) { @@ -1336,6 +1338,12 @@ static inline struct drm_bridge *of_drm_find_bridge(struct device_node *np) { return NULL; } +static inline int of_drm_get_bridge_by_endpoint(const struct device_node *np, + int port, int endpoint, + struct drm_bridge **bridge) +{ + return -ENODEV; +} #endif static inline bool drm_bridge_is_last(struct drm_bridge *bridge) -- 2.53.0