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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=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by CO1PEPF000044FD.mail.protection.outlook.com (10.167.241.203) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7113.7 via Frontend Transport; Tue, 12 Dec 2023 19:17:42 +0000 Received: from jatayu.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.34; Tue, 12 Dec 2023 13:17:03 -0600 From: Sanath S To: , , , , , , CC: Sanath S Subject: [Patch v2 2/2] thunderbolt: Teardown tunnels and reset downstream ports created by boot firmware Date: Wed, 13 Dec 2023 00:46:35 +0530 Message-ID: <20231212191635.2022520-3-Sanath.S@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231212191635.2022520-1-Sanath.S@amd.com> References: <20231212191635.2022520-1-Sanath.S@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF000044FD:EE_|SJ0PR12MB6831:EE_ X-MS-Office365-Filtering-Correlation-Id: 83a6067f-bf39-445c-8050-08dbfb470396 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Dec 2023 19:17:42.2939 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 83a6067f-bf39-445c-8050-08dbfb470396 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=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1PEPF000044FD.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR12MB6831 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Boot firmware might have created tunnels of its own. Since we cannot be sure they are usable for us. Tear them down and reset the ports to handle it as a new hotplug for USB3 routers. Suggested-by: Mario Limonciello Signed-off-by: Sanath S Reviewed-by: Mario Limonciello --- drivers/thunderbolt/tb.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c index fd49f86e0353..febd0b6972e3 100644 --- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -2598,6 +2598,17 @@ static int tb_start(struct tb *tb) tb_switch_tmu_enable(tb->root_switch); /* Full scan to discover devices added before the driver was loaded. */ tb_scan_switch(tb->root_switch); + /* + * Boot firmware might have created tunnels of its own. Since we cannot + * be sure they are usable for us, Tear them down and reset the ports + * to handle it as new hotplug for USB4 routers. + */ + if (tb_switch_is_usb4(tb->root_switch)) { + tb_switch_discover_tunnels(tb->root_switch, + &tcm->tunnel_list, false); + tcm->hotplug_active =3D true; + return tb_switch_reset_ports(tb->root_switch); + } /* Find out tunnels created by the boot firmware */ tb_discover_tunnels(tb); /* Add DP resources from the DP tunnels created by the boot firmware */ --=20 2.34.1