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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB03.amd.com; Received: from SATLEXMB03.amd.com (165.204.84.17) by BN8NAM11FT062.mail.protection.outlook.com (10.13.177.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.5206.12 via Frontend Transport; Thu, 28 Apr 2022 12:49:48 +0000 Received: from SATLEXMB04.amd.com (10.181.40.145) by SATLEXMB03.amd.com (10.181.40.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Thu, 28 Apr 2022 07:49:47 -0500 Received: from wayne-System-Product-Name.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server id 15.1.2375.24 via Frontend Transport; Thu, 28 Apr 2022 07:49:45 -0500 From: Wayne Lin To: Subject: [PATCH] drm/dp_mst: Lower down debug info level when receive NAK Date: Thu, 28 Apr 2022 20:49:44 +0800 Message-ID: <20220428124944.1683680-1-Wayne.Lin@amd.com> X-Mailer: git-send-email 2.36.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 30eab8fa-3b37-4449-66ec-08da2915940c X-MS-TrafficTypeDiagnostic: MN2PR12MB3069:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Apr 2022 12:49:48.0614 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 30eab8fa-3b37-4449-66ec-08da2915940c X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT062.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB3069 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: rodrigo.siqueira@amd.com, jerry.zuo@amd.com, Wayne Lin Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" [Why] It's reasonable that we receive NAK while doing DP_REMOTE_DPCD_READ. Downstream device might reply NAK with the reason and source should react accordingly. e.g. 1. When downstream device can't handle corresponding message in time, it then replies NAK as reason been set as DEFER. 2. When multi-function branch-sink device doesn't enumerate virtual DP peer devices for those multi-function down facing ports. Without virtual DPCD, branch device might reply NAK with reason as BAD_PARAM indicating this port can't do aux DPCD read. It's expected result. Not an error. [How] Use drm_dbg_kms() to replace drm_err() when receive NAK. Changes since v1: * drm_dp_mst_topology.c file path changed. Folder was rename from 'dp' to 'display' Signed-off-by: Wayne Lin Reviewed-by: Harry Wentland --- drivers/gpu/drm/display/drm_dp_mst_topology.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c index 8526aae75c6d..f27aa0b95bea 100644 --- a/drivers/gpu/drm/display/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c @@ -3557,9 +3557,8 @@ static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, if (ret < 0) goto fail_free; - /* DPCD read should never be NACKed */ if (txmsg->reply.reply_type == 1) { - drm_err(mgr->dev, "mstb %p port %d: DPCD read on addr 0x%x for %d bytes NAKed\n", + drm_dbg_kms(mgr->dev, "mstb %p port %d: DPCD read on addr 0x%x for %d bytes NAKed\n", mstb, port->port_num, offset, size); ret = -EIO; goto fail_free; -- 2.36.0