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 X-Spam-Level: X-Spam-Status: No, score=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 63A1AC28CBC for ; Wed, 6 May 2020 16:41:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4DB4320708 for ; Wed, 6 May 2020 16:41:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729911AbgEFQlj (ORCPT ); Wed, 6 May 2020 12:41:39 -0400 Received: from asavdk4.altibox.net ([109.247.116.15]:59562 "EHLO asavdk4.altibox.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729447AbgEFQlh (ORCPT ); Wed, 6 May 2020 12:41:37 -0400 Received: from ravnborg.org (unknown [158.248.194.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by asavdk4.altibox.net (Postfix) with ESMTPS id 798738046E; Wed, 6 May 2020 18:41:34 +0200 (CEST) Date: Wed, 6 May 2020 18:41:33 +0200 From: Sam Ravnborg To: Dmitry Osipenko Cc: Thierry Reding , Laurent Pinchart , Rob Herring , Frank Rowand , linux-tegra@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: Re: [PATCH v5 2/6] drm/of: Make drm_of_find_panel_or_bridge() to check graph's presence Message-ID: <20200506164133.GB19296@ravnborg.org> References: <20200418170703.1583-1-digetx@gmail.com> <20200418170703.1583-3-digetx@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200418170703.1583-3-digetx@gmail.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-CMAE-Score: 0 X-CMAE-Analysis: v=2.3 cv=MOBOZvRl c=1 sm=1 tr=0 a=UWs3HLbX/2nnQ3s7vZ42gw==:117 a=UWs3HLbX/2nnQ3s7vZ42gw==:17 a=kj9zAlcOel0A:10 a=pGLkceISAAAA:8 a=7gkXJVJtAAAA:8 a=e5mUnYsNAAAA:8 a=ZfXzQBuPKYn6lThc9qoA:9 a=CjuIK1q_8ugA:10 a=E9Po1WZjFZOl8hwRPBS3:22 a=Vxmtnl_E_bksehYqCbjh:22 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Apr 18, 2020 at 08:06:59PM +0300, Dmitry Osipenko wrote: > When graph isn't defined in a device-tree, the of_graph_get_remote_node() > prints a noisy error message, telling that port node is not found. This is > undesirable behaviour in our case because absence of a panel/bridge graph > is a valid case. Let's check presence of the local port in a device-tree > before proceeding with parsing the graph. > > Signed-off-by: Dmitry Osipenko Reviewed-by: Sam Ravnborg > --- > drivers/gpu/drm/drm_of.c | 13 ++++++++++++- > 1 file changed, 12 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c > index b50b44e76279..e0652c38f357 100644 > --- a/drivers/gpu/drm/drm_of.c > +++ b/drivers/gpu/drm/drm_of.c > @@ -239,13 +239,24 @@ int drm_of_find_panel_or_bridge(const struct device_node *np, > struct drm_bridge **bridge) > { > int ret = -EPROBE_DEFER; > - struct device_node *remote; > + struct device_node *local, *remote; > > if (!panel && !bridge) > return -EINVAL; > if (panel) > *panel = NULL; > > + /* > + * 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 presence of the local port. > + */ > + local = of_graph_get_local_port(np); > + if (!local) > + return -ENODEV; > + > + of_node_put(local); > + > remote = of_graph_get_remote_node(np, port, endpoint); > if (!remote) > return -ENODEV; > -- > 2.26.0 > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel