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 8C15A419304 for ; Thu, 3 Sep 2026 08:12:20 +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=1788423142; cv=none; b=AdDM9RgF58GXZWMbEm+Ni8ryXsJ36Ip0lSJca6HTkSKG+TT/humOum2uGLmqpW2Lrk8bVPxlfd3440BsWv+p8JzRSn8TsAj1fTUjCAhjM4BGVUE/lkbJh7JheDxfZKEiWzml3FCe5tG3muvhEgQfxRD++ioGt3lXLv2YrUzLfOQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788423142; c=relaxed/simple; bh=sbS7BPCMYyqCO+Qn7zpLxIOerE/Dp2fAYuLT+8QlNGo=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=fc7wz52q7R6O5f20koUfhThbdGRlYvgKQLZyIIVHyUw+3Xrz28hyB3SutNTm8mm6TgW1E9NppaGSrWPZeN3J1oD5y5+q4b2ThhJsYBgMGCJ07/mPWgoQdPrVxf1VTLl/kBJKIh22NpszWeU6uMP6GwAfP5Oe54G/lTVXHv4Lx/8= 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=B0hdNk1h; 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="B0hdNk1h" Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-02.galae.net (Postfix) with ESMTPS id EFC4E1A198D; Thu, 3 Sep 2026 08:12:18 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id C2ACF602B8; Thu, 3 Sep 2026 08:12:18 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id E96A311C79FFE; Thu, 3 Sep 2026 10:12:13 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1788423137; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=qrl7+kbklONvZ1AqswtkUlrd6of2RCwJAsuQPOn1hyY=; b=B0hdNk1htDpeVEYT429cabUl0ivfFt5yfh/qmVW5njp8XYf4R0GAbJoF/eNG8pmaaTr8p4 pHqHjHwrTU4rgzOWcxywfyzYs+OsSkeLYy5KfDQZu1OtWv1KKJob2Wn1lRsKRLha6ucwyf wIy/Orv+WxGD9BgdsNac8Jr1yKxKAnAuv2x387yvfmt1bzcka/UN4zb6a4NOVpMfhoZjWG RKWsODspw+ceYb/h9EJrAd+H0DUWFOqbIScXQ86Vu69kiDjwqcoOhJi7WE3NnrGywrMydG DCXqbqAHHvpUY1XAKYzlotHjaqMIBTX/FZhWg42y5OqvJhnI/SGDsO6gt5cE3Q== From: Luca Ceresoli Date: Thu, 03 Sep 2026 10:11:10 +0200 Subject: [PATCH RFC v2 07/19] 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: <20260903-drm-bridge-every-panel-v2-7-2ab8ee24538e@bootlin.com> References: <20260903-drm-bridge-every-panel-v2-0-2ab8ee24538e@bootlin.com> In-Reply-To: <20260903-drm-bridge-every-panel-v2-0-2ab8ee24538e@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: Albert Esteve , Anusha Srivatsa , 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 call to devm_drm_panel_bridge_add() would lead to creating a second panel_bridge for the same panel. Update and simplify the code by just getting a reference to the already-existing bridge using of_drm_get_bridge_by_endpoint(). As of_drm_get_bridge_by_endpoint() returns a refcounted 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 | 17 +++++------------ 1 file changed, 5 insertions(+), 12 deletions(-) diff --git a/drivers/gpu/drm/bridge/waveshare-dsi.c b/drivers/gpu/drm/bridge/waveshare-dsi.c index 420f3b870a74..2c40bfef2b45 100644 --- a/drivers/gpu/drm/bridge/waveshare-dsi.c +++ b/drivers/gpu/drm/bridge/waveshare-dsi.c @@ -16,11 +16,9 @@ #include #include #include -#include 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 +87,7 @@ 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 +148,6 @@ 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 +161,10 @@ 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 bridge\n"); ws->backlight = ws_bridge_create_backlight(ws); if (IS_ERR(ws->backlight)) { -- 2.55.0