From patchwork Wed Nov 4 14:00:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mika Westerberg X-Patchwork-Id: 11880715 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 0A2DF174A for ; Wed, 4 Nov 2020 14:01:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E3ABF223FD for ; Wed, 4 Nov 2020 14:01:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726884AbgKDOBP (ORCPT ); Wed, 4 Nov 2020 09:01:15 -0500 Received: from mga01.intel.com ([192.55.52.88]:47942 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730162AbgKDOAf (ORCPT ); Wed, 4 Nov 2020 09:00:35 -0500 IronPort-SDR: 2h5XEzWXYmTl4+WyGv/DrxlH313AAdJtfGdp9sjBBpFJ6UGoR/cYdnVA1QLkl+iJvEvhIEhEdA 57KawJYYXFoQ== X-IronPort-AV: E=McAfee;i="6000,8403,9794"; a="187077837" X-IronPort-AV: E=Sophos;i="5.77,451,1596524400"; d="scan'208";a="187077837" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Nov 2020 06:00:34 -0800 IronPort-SDR: 55+C+FN/VNIl1oZWAZxxdiMnvgqPJSBeYe6RX+dPqR5NF9aPwEMGmiPwLtbU+4JjNLWk2xrSgE v/yxAvjeWL3w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.77,451,1596524400"; d="scan'208";a="352684827" Received: from black.fi.intel.com ([10.237.72.28]) by orsmga008.jf.intel.com with ESMTP; 04 Nov 2020 06:00:31 -0800 Received: by black.fi.intel.com (Postfix, from userid 1001) id DB8D512A; Wed, 4 Nov 2020 16:00:30 +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" , Mika Westerberg , netdev@vger.kernel.org Subject: [PATCH 01/10] thunderbolt: Do not clear USB4 router protocol adapter IFC and ISE bits Date: Wed, 4 Nov 2020 17:00:21 +0300 Message-Id: <20201104140030.6853-2-mika.westerberg@linux.intel.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201104140030.6853-1-mika.westerberg@linux.intel.com> References: <20201104140030.6853-1-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 --- 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,