From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtpout-02.galae.net (smtpout-02.galae.net [185.246.84.56]) (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 ADF893B7B64 for ; Fri, 14 Aug 2026 14:07:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.246.84.56 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786716430; cv=none; b=OTS33JMx32geReyOjkXZlkpKH7NMrk6jHEr+9Lx5zXEeEkqNUbLB2sQadjkpaToDsIf0U3LHcqEjH5deSFQ0JbsFf2Zceo2owe0Qm5fH+eAIelWeizdfjoQ7hN92njHKzDNuecAPNwCLD0ZDMT13h4xO4dbgbht8SBqtIfyXDY4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786716430; c=relaxed/simple; bh=5EUTZ45EZ7ERUo8JZccbvWEA+0gAUudF1GukT3TSwgA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=GRiB4SDzE2yE9GdyjNQcCtlxyQ6yrFTayuzXgL+cnjdDBfvDPsFtHG+fEegke+Rk6NQNpdDi787z2pqswl+zB6c1Fx8ppkYtATc3Y0N+FxXqGDAUFCZN+w3lvqtSC0ohzwT9RPrnv4lk4rR5Qtmg8t136fP8pcZriY8s0DQGqpg= 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=zD2lVxK/; arc=none smtp.client-ip=185.246.84.56 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="zD2lVxK/" Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-02.galae.net (Postfix) with ESMTPS id 740FD1A163D; Fri, 14 Aug 2026 14:07:04 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id 489F36046D; Fri, 14 Aug 2026 14:07:04 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 02C4B11C4EDAF; Fri, 14 Aug 2026 16:06:59 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1786716423; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=W47g4Q+NYk342rCC6QpiuRC+u7VsigF4CoJiynORV1Y=; b=zD2lVxK/VXoKuOuAbtULGsk9nbiSaPBmFJLXxe4bs81JWRPnhaZn7vmRdR2Y7FbhJKCn9K a0n6r9jpHe7jgIfLI3EpJKiCydHJWRceaHvsMfMS9Qu2UkMd7Ud9TOKeLEg/Y/8+aYeCti ZVfN6jkCHJxui+c7KIncPZCSSpRbBXUI/sN+EsuZvToq5oQO7eEwOXGx3phhuIpgoutpE2 0l16xqQXmCQdnZh05mezWRssxshA3ZpTiyiOQfsyPmOsKqTZVBjVYP9iRimdGElmEQIHqO sETv5AGk3bWFThYa8URcUtUr3kqWrXzo6+iAJbciMu0cdQCmpmT1lQM80UUaEw== From: Luca Ceresoli Date: Fri, 14 Aug 2026 16:05:55 +0200 Subject: [PATCH 07/11] drm/bridge: waveshare-dsi: don't create a panel_bridge 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: <20260814-drm-bridge-every-panel-v1-7-19cd5277cc8d@bootlin.com> References: <20260814-drm-bridge-every-panel-v1-0-19cd5277cc8d@bootlin.com> In-Reply-To: <20260814-drm-bridge-every-panel-v1-0-19cd5277cc8d@bootlin.com> To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Jessica Zhang , Linus Walleij , Inki Dae , Jagan Teki , Marek Szyprowski Cc: Dmitry Baryshkov , Hui Pu , Ian Ray , Thomas Petazzoni , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Luca Ceresoli X-Mailer: b4 0.16.0 X-Last-TLS-Session-Version: TLSv1.3 Now a panel_bridge is automatically created for every drm_panel, so this panel-only call to drm_of_find_panel_or_bridge() would lead to creating a second panel_bridge for the same panel. Fix and simplify the code by just getting a reference to the already-existing panel_bridge using of_drm_get_bridge_by_endpoint(). As of_drm_get_bridge_by_endpoint() returns a refcouncted bridge, take care of putting the bridge reference by using bridge->next_bridge. Signed-off-by: Luca Ceresoli --- drivers/gpu/drm/bridge/waveshare-dsi.c | 16 +++++----------- 1 file changed, 5 insertions(+), 11 deletions(-) diff --git a/drivers/gpu/drm/bridge/waveshare-dsi.c b/drivers/gpu/drm/bridge/waveshare-dsi.c index 420f3b870a74..b79a1d32e679 100644 --- a/drivers/gpu/drm/bridge/waveshare-dsi.c +++ b/drivers/gpu/drm/bridge/waveshare-dsi.c @@ -20,7 +20,6 @@ struct ws_bridge { struct drm_bridge bridge; - struct drm_bridge *next_bridge; struct backlight_device *backlight; struct device *dev; struct regmap *reg_map; @@ -89,7 +88,7 @@ static int ws_bridge_bridge_attach(struct drm_bridge *bridge, { struct ws_bridge *ws = bridge_to_ws_bridge(bridge); - return drm_bridge_attach(encoder, ws->next_bridge, + return drm_bridge_attach(encoder, ws->bridge.next_bridge, &ws->bridge, flags); } @@ -150,7 +149,6 @@ static struct backlight_device *ws_bridge_create_backlight(struct ws_bridge *ws) static int ws_bridge_probe(struct i2c_client *i2c) { struct device *dev = &i2c->dev; - struct drm_panel *panel; struct ws_bridge *ws; int ret; @@ -164,14 +162,10 @@ static int ws_bridge_probe(struct i2c_client *i2c) if (IS_ERR(ws->reg_map)) return dev_err_probe(dev, PTR_ERR(ws->reg_map), "Failed to allocate regmap\n"); - ret = drm_of_find_panel_or_bridge(dev->of_node, 1, -1, &panel, NULL); - if (ret) - return dev_err_probe(dev, ret, "Failed to find remote panel\n"); - - ws->next_bridge = devm_drm_panel_bridge_add(dev, panel); - drm_panel_put(panel); - if (IS_ERR(ws->next_bridge)) - return PTR_ERR(ws->next_bridge); + ws->bridge.next_bridge = of_drm_get_bridge_by_endpoint(dev->of_node, 1, -1); + if (IS_ERR(ws->bridge.next_bridge)) + return dev_err_probe(dev, PTR_ERR(ws->bridge.next_bridge), + "Failed to find remote panel\n"); ws->backlight = ws_bridge_create_backlight(ws); if (IS_ERR(ws->backlight)) { -- 2.55.0