From patchwork Tue Nov 10 09:19:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mika Westerberg X-Patchwork-Id: 11893663 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D2150697 for ; Tue, 10 Nov 2020 09:20:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B5E7220829 for ; Tue, 10 Nov 2020 09:20:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731729AbgKJJUk (ORCPT ); Tue, 10 Nov 2020 04:20:40 -0500 Received: from mga02.intel.com ([134.134.136.20]:52778 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729909AbgKJJUE (ORCPT ); Tue, 10 Nov 2020 04:20:04 -0500 IronPort-SDR: IbHrBAd8GP1xmQzkVugIkB0PPETrVwZoZNkIb5M++EMv8NIsj3xAhSHPtGYkF0WBkuUyJNjPD8 nBgHEtuB3zpA== X-IronPort-AV: E=McAfee;i="6000,8403,9800"; a="156950715" X-IronPort-AV: E=Sophos;i="5.77,466,1596524400"; d="scan'208";a="156950715" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Nov 2020 01:20:02 -0800 IronPort-SDR: uCxQ0LdWe7kqqXei3G5TjN4VOMDWBZI3jGuxVFgV81fXF7hG0Jww9oGEFYm9iHDr02gQjNazYB ijObM0cWPlcA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.77,466,1596524400"; d="scan'208";a="473356418" Received: from black.fi.intel.com ([10.237.72.28]) by orsmga004.jf.intel.com with ESMTP; 10 Nov 2020 01:19:58 -0800 Received: by black.fi.intel.com (Postfix, from userid 1001) id 46AEC1CC; Tue, 10 Nov 2020 11:19:57 +0200 (EET) From: Mika Westerberg To: linux-usb@vger.kernel.org Cc: Michael Jamet , Yehezkel Bernat , Andreas Noever , Isaac Hazan , Lukas Wunner , "David S . Miller" , Greg Kroah-Hartman , Mika Westerberg , netdev@vger.kernel.org Subject: [PATCH v2 01/10] thunderbolt: Do not clear USB4 router protocol adapter IFC and ISE bits Date: Tue, 10 Nov 2020 12:19:48 +0300 Message-Id: <20201110091957.17472-2-mika.westerberg@linux.intel.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201110091957.17472-1-mika.westerberg@linux.intel.com> References: <20201110091957.17472-1-mika.westerberg@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org These fields are marked as vendor defined in the USB4 spec and should not be modified by the software, so only clear them when we are dealing with pre-USB4 hardware. Signed-off-by: Mika Westerberg Acked-by: Yehezkel Bernat --- drivers/thunderbolt/path.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/thunderbolt/path.c b/drivers/thunderbolt/path.c index 03e7b714deab..7c2c45d9ba4a 100644 --- a/drivers/thunderbolt/path.c +++ b/drivers/thunderbolt/path.c @@ -406,10 +406,17 @@ static int __tb_path_deactivate_hop(struct tb_port *port, int hop_index, if (!hop.pending) { if (clear_fc) { - /* Clear flow control */ - hop.ingress_fc = 0; + /* + * Clear flow control. Protocol adapters + * IFC and ISE bits are vendor defined + * in the USB4 spec so we clear them + * only for pre-USB4 adapters. + */ + if (!tb_switch_is_usb4(port->sw)) { + hop.ingress_fc = 0; + hop.ingress_shared_buffer = 0; + } hop.egress_fc = 0; - hop.ingress_shared_buffer = 0; hop.egress_shared_buffer = 0; return tb_port_write(port, &hop, TB_CFG_HOPS,