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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 12ABCCDB465 for ; Mon, 16 Oct 2023 08:47:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232790AbjJPIrY (ORCPT ); Mon, 16 Oct 2023 04:47:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41004 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232918AbjJPIrQ (ORCPT ); Mon, 16 Oct 2023 04:47:16 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3F295F3 for ; Mon, 16 Oct 2023 01:47:15 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5086CC433C7; Mon, 16 Oct 2023 08:47:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1697446034; bh=Dqvw0ovAf1yXELfFlOU0MrezIeyWKw9ZueMRdN/iuN8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XrbdP/U5WKXddlJO2eIDWl3zkHiqpXtxBhNwvtPR/d2aXnPZQs5UZgihpB0DJM26d aURicp3I20Q3l3VpLizAlkhydbgW13SfsSRLG0wAk2XA+/gmhOpcD7UAepS34Vr/zJ Jsii9RF3U4SyhjdplQxvkn1A8wGaMPbI9qeVvC8A= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?Marek=20=C5=A0anta?= , Mika Westerberg Subject: [PATCH 5.15 064/102] thunderbolt: Check that lane 1 is in CL0 before enabling lane bonding Date: Mon, 16 Oct 2023 10:41:03 +0200 Message-ID: <20231016083955.409551587@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231016083953.689300946@linuxfoundation.org> References: <20231016083953.689300946@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mika Westerberg commit a9fdf5f933a6f2b358fad0194b1287b67f6704b1 upstream. Marek reported that when BlackMagic UltraStudio device is connected the kernel repeatedly tries to enable lane bonding without success making the device non-functional. It looks like the device does not have lane 1 connected at all so even though it is enabled we should not try to bond the lanes. For this reason check that lane 1 is in fact CL0 (connected, active) before attempting to bond the lanes. Reported-by: Marek Šanta Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217737 Cc: stable@vger.kernel.org Signed-off-by: Mika Westerberg Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/switch.c | 7 +++++++ 1 file changed, 7 insertions(+) --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -2552,6 +2552,13 @@ int tb_switch_lane_bonding_enable(struct !tb_port_is_width_supported(down, 2)) return 0; + /* + * Both lanes need to be in CL0. Here we assume lane 0 already be in + * CL0 and check just for lane 1. + */ + if (tb_wait_for_port(down->dual_link_port, false) <= 0) + return -ENOTCONN; + ret = tb_port_lane_bonding_enable(up); if (ret) { tb_port_warn(up, "failed to enable lane bonding\n");