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=-5.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham 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 9B092C433E0 for ; Tue, 30 Jun 2020 14:24:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8017720672 for ; Tue, 30 Jun 2020 14:24:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388838AbgF3OYK (ORCPT ); Tue, 30 Jun 2020 10:24:10 -0400 Received: from mga11.intel.com ([192.55.52.93]:53758 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726796AbgF3OYI (ORCPT ); Tue, 30 Jun 2020 10:24:08 -0400 IronPort-SDR: pOq4pq8/CYklsXybLSyFmlJqXXqLl5d8e4+i7qFc2FJcoIQtgMdBUD4/KlHiLmwikIChAKWh3X kwZ4hAXwPJ/A== X-IronPort-AV: E=McAfee;i="6000,8403,9666"; a="144419399" X-IronPort-AV: E=Sophos;i="5.75,297,1589266800"; d="scan'208";a="144419399" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Jun 2020 07:24:06 -0700 IronPort-SDR: sQESveKzFayyMS5hcTi1zub1Bu4kAspDUDRNxWD3JP3oW0JK6SP/Y1wfLDxmHpEArOYo9KBr0q p9b2aAx22mkw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,297,1589266800"; d="scan'208";a="312379155" Received: from mattu-haswell.fi.intel.com (HELO [10.237.72.170]) ([10.237.72.170]) by orsmga008.jf.intel.com with ESMTP; 30 Jun 2020 07:24:03 -0700 Subject: Re: XHCI vs PCM2903B/PCM2904 part 2 To: Rik van Riel , Alan Stern Cc: linux-usb , alsa-devel@alsa-project.org, "linux-kernel@vger.kernel.org" , Mathias Nyman , Greg Kroah-Hartman , Jaroslav Kysela , Takashi Iwai References: <273cc1c074cc4a4058f31afe487fb233f5cf0351.camel@surriel.com> <20200520163840.GA11084@rowland.harvard.edu> <667d8d156fa5d8420ef1c3b1d08b94a10d2398cc.camel@surriel.com> <20200520203417.GA23602@rowland.harvard.edu> <059878e7-75b8-e033-ec9f-7e6b73df8f78@linux.intel.com> <6917929c7dd7786b5b673743ce45bbcd56e6b1f1.camel@surriel.com> <90D456E4-328F-49F7-99C4-D729E38FA04E@surriel.com> 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: <90D456E4-328F-49F7-99C4-D729E38FA04E@surriel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 30.6.2020 16.08, Rik van Riel wrote: > I misread the code, it's not a bitfield, so state 1 means an endpoint marked with running state. The next urb is never getting a response, though. > > However, the xhci spec says an endpoint is halted upon a babble error. I was looking at the same, so according to specs this state shouldn't be possible. > > The code right above the babble handling case adds halted into the endpoint state itself. Does the code handling the babble error need to do something similar to trigger cleanup elsewhere? It's a flag to prevent ringing the doorbell for a halted endpoint. Anyway, reset endpoint is meant to recover an endpoint in a halted state. Resetting non-halted endpoints will just lead to a context state error, and besides, isoc endpoints shouldn't halt. Anyways, I haven't got any better idea at the moment. You can try and see what a forced reset does with: diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 2c255d0620b0..d79aca0df6d4 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -1900,8 +1900,7 @@ static int xhci_requires_manual_halt_cleanup(struct xhci_hcd *xhci, * endpoint anyway. Check if a babble halted the * endpoint. */ - if (GET_EP_CTX_STATE(ep_ctx) == EP_STATE_HALTED) - return 1; + return 1; return 0; } Traces also showed thet endpoint doorbell was rang after th babble error, so we know that didn't help restarting the endpoint. -Mathias