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=-5.3 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 25C85C433B4 for ; Fri, 16 Apr 2021 12:07:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DE5CF61184 for ; Fri, 16 Apr 2021 12:07:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233008AbhDPMIP (ORCPT ); Fri, 16 Apr 2021 08:08:15 -0400 Received: from mga05.intel.com ([192.55.52.43]:49170 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232130AbhDPMIP (ORCPT ); Fri, 16 Apr 2021 08:08:15 -0400 IronPort-SDR: Wb9sutoC3qQIicUOZnuaTKcCBipV7yKvZi3eOKIt0q0gnl4GsG+zIhBKwUhiVOzQDhiST9/22d O8R9fayurY+Q== X-IronPort-AV: E=McAfee;i="6200,9189,9955"; a="280348816" X-IronPort-AV: E=Sophos;i="5.82,226,1613462400"; d="scan'208";a="280348816" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Apr 2021 05:07:50 -0700 IronPort-SDR: At88vdDMJq4OkaPF0eHHr5ff5kA8Sx58hwfacQwc0MRkU4UJoePg2BisuQortmNZp9SmOzlszs L9xc8pD3faFA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.82,226,1613462400"; d="scan'208";a="615942141" Received: from mattu-haswell.fi.intel.com (HELO [10.237.72.170]) ([10.237.72.170]) by fmsmga005.fm.intel.com with ESMTP; 16 Apr 2021 05:07:49 -0700 Subject: Re: [PATCH] [RFC] xhci: Add Link TRB sync quirk for ASM3142 To: Ole Salscheider , linux-usb@vger.kernel.org Cc: Mathias Nyman References: <20210416093729.41865-1-ole@salscheider.org> From: Mathias Nyman Autocrypt: addr=mathias.nyman@linux.intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210416093729.41865-1-ole@salscheider.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Hi Ole On 16.4.2021 12.37, Ole Salscheider wrote: > This patch adds a quirk to the xhci driver so that link TRBs are only > given to the host controller once it has processed all previous TRBs on > this segment. > > This quirk is necessary for me on an ASMedia ASM3142 host controller. > Without it, I get the following errors when accessing a SuperSpeed UVC > camera: > > Transfer event TRB DMA ptr not part of current TD ep_index XX comp_code XX > > You can find more details in my previous mail about the problem: > https://lkml.org/lkml/2021/3/31/355 > > This patch fixes my problem, but it is probably terribly wrong. I am not > even sure if I can rely on handle_tx_event being called before each link > TRB in the segment. Some feedback would be very welcome. I think we need to look at the cause more closely. We normally only get events for the last TRB of a TD, or for short transfers like in your case. So not every transfer TRB generates events. There are several things going on here that combined could cause this. Last transfer TRB of a segment has some alignment requirements which might not be handled in the isoc case. The amount of untransferred data is large, (16388 bytes) so the TRB causing the short packet could be far from the last TRB we expect the event on. Due to new segment and link trb maybe the stored last_trb for this TD is just set wrong Anyway, more detailed traces together with dynamic debug show us more: mount -t debugfs none /sys/kernel/debug echo 'module xhci_hcd =p' >/sys/kernel/debug/dynamic_debug/control echo 'module usbcore =p' >/sys/kernel/debug/dynamic_debug/control echo 81920 > /sys/kernel/debug/tracing/buffer_size_kb echo 1 > /sys/kernel/debug/tracing/events/xhci-hcd/enable < trigger the issue > Send output of dmesg Send content of /sys/kernel/debug/tracing/trace trace accumulates pretty fast so try to copy it as soon as the issue is seen. Thanks -Mathias