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 X-Spam-Level: X-Spam-Status: No, score=-7.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1FEABC433DF for ; Mon, 24 Aug 2020 13:45:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E8C672074D for ; Mon, 24 Aug 2020 13:45:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726187AbgHXNpb (ORCPT ); Mon, 24 Aug 2020 09:45:31 -0400 Received: from mga03.intel.com ([134.134.136.65]:61093 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726024AbgHXNpa (ORCPT ); Mon, 24 Aug 2020 09:45:30 -0400 IronPort-SDR: at0WDYbrUWUIkv12KMrWFvSf9olDQAp+RzY523gxtDEHqmQX52FNJfRxAHeoqYQzgZO3BuLr2y tpNMuCCFIPuw== X-IronPort-AV: E=McAfee;i="6000,8403,9722"; a="155882505" X-IronPort-AV: E=Sophos;i="5.76,348,1592895600"; d="scan'208";a="155882505" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Aug 2020 06:45:29 -0700 IronPort-SDR: UfO5vfJKqd+PELLEYNYN9SgcEMYprtbYEVGf0H17XsK1IP+SV4iRB0CT7ZRoxYa6LGmZYn/Q94 BzTkY5VWGkGg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.76,348,1592895600"; d="scan'208";a="331024908" Received: from mattu-haswell.fi.intel.com (HELO [10.237.72.170]) ([10.237.72.170]) by fmsmga002.fm.intel.com with ESMTP; 24 Aug 2020 06:45:28 -0700 Subject: Re: Data toggles not reset on "set configuration" for ports handled by "xhci_hcd" driver To: Martin Thierer Cc: Alan Stern , linux-usb@vger.kernel.org References: <20200821160321.GA256196@rowland.harvard.edu> <20200821170106.GB256196@rowland.harvard.edu> From: Mathias Nyman Openpgp: preference=signencrypt Autocrypt: addr=mathias.nyman@linux.intel.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On 24.8.2020 16.10, Martin Thierer wrote: >> True, xHCI doesn't reset the toggle in this case. >> xHC only keeps track of added or dropped endpoints, it doesn't track >> which configuration or interface is set. > > I'm not sure if it's relevant, but I found that calling libusb's > set_interface() *does* seem to reset the data toggles also on xhci > ports, even if it does not actually change the interface. > > Martin It does, I checked that usb_set_configuration() ends up dropping and re-adding the endpoint when it calls usb_hcd_alloc_bandwidth(), this should cause xhci driver to reset the toggles. Looks like libusb set_configuration could end up calling usb_reset_configuration() instead. If there are no changes it's possible usb_hcd_alloc_bandwidth() never gets called, and toggles never reset. see drivers/usb/core/devio.c proc_setconfig() -Mathias