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=-5.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, 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 0CAA3C433EA for ; Tue, 28 Jul 2020 19:29:19 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8CD2F20656 for ; Tue, 28 Jul 2020 19:29:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alsa-project.org header.i=@alsa-project.org header.b="B5t7+Il6"; dkim=pass (1024-bit key) header.d=marzen.de header.i=@marzen.de header.b="DvwDoVys" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8CD2F20656 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=marzen.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=alsa-devel-bounces@alsa-project.org Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id EFF4E1742; Tue, 28 Jul 2020 21:28:26 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz EFF4E1742 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1595964557; bh=2CQkSF3z2Khr3ozs8hZxvRORlmBNOttbUHW3xO2homg=; h=Date:From:To:Subject:List-Id:List-Unsubscribe:List-Archive: List-Post:List-Help:List-Subscribe:Reply-To:From; b=B5t7+Il6PXACX4DdbhPOdb4WZKlXvKvsk/L/SqVQw1ZkpTPCnwGT7Wu6bMqQPebp9 IEquz0XwvdXQ1Tz1TNSsf2lG6TXZYC+9EI5FMh/di+Ei5GIfC18omkhd9c1FWztT+j 4w+24ZeNchZh6eZ7M3hw61aOSI6X2dp6AOgE9QtY= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 72EA3F8029B; Tue, 28 Jul 2020 21:27:46 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 01BA6F802BD; Tue, 28 Jul 2020 21:27:46 +0200 (CEST) Received: from schnee.saar.de (schnee.saar.de [192.109.53.243]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id CB862F8027B for ; Tue, 28 Jul 2020 21:27:43 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz CB862F8027B Authentication-Results: alsa1.perex.cz; dkim=pass (1024-bit key) header.d=marzen.de header.i=@marzen.de header.b="DvwDoVys" Received: from bubu.intern.marzen.de (bubu.intern.marzen.de [10.66.53.29]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by schnee.saar.de (Postfix) with ESMTPS id A4B0063F63 for ; Tue, 28 Jul 2020 21:27:42 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=marzen.de; s=201902; t=1595964462; bh=2CQkSF3z2Khr3ozs8hZxvRORlmBNOttbUHW3xO2homg=; h=Date:From:Reply-To:To:Subject:From; b=DvwDoVysC108Vk5JwwVcZMWXrtUA0Zkltq/tLiuhLM+I7ZQplYSvHPy1UoHfy3mqm 7RGQV98NnC4uUbDchKj1ONr/iI42NiCwcsXVdjfkC4LrkkIRcDOEv3bvdrhi4DSnmn Ns6zHAuwXv/sBim9iZ2OqIsczJXib9zi/iOsYhKw= Date: Tue, 28 Jul 2020 21:27:42 +0200 (CEST) From: Holger Marzen X-X-Sender: hm@bubu.intern.marzen.de To: alsa-devel@alsa-project.org Subject: MOTU Ultralite AVB: Modulo-8 output channel hopping Message-ID: User-Agent: Alpine 2.20 (DEB 67 2015-01-07) MIME-Version: 1.0 Content-Type: multipart/mixed; BOUNDARY="8323329-1219487617-1595925347=:4307" Content-ID: X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: holger@marzen.de Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" --8323329-1219487617-1595925347=:4307 Content-Type: text/plain; charset=US-ASCII Content-ID: Hi all, I am using the MOTU Ultralite AVB USB audio interface. With recent firmwares MOTU uses implicit feedback. Kernel 5.8-rc6 can handle it when I apply the attached patch with the MOTU signatures. But both with the old and the new firmware there is an occasional modulo 8 output channel hopping. What goes out to system:playback_1 in jackd ends on channel 1, 9 or 17 in the interface. Same for system:playback_2. I can force a hop when changing jackd's buffer size on the fly with jack_bufsize. One user reports this issue with ALSA clients, too, so it's probably no jackd issue. Since I never found this issue reported from a Windows or Mac user it may be buried deep in the ALSA kernel code. For me it seems that flaws/timeouts in the USB communication force this hopping in the ALSA kernel. Any ideas how to find out where the hopping happens? sound/usb/endpoint.c ? sound/usb/stream.c? Regards Holger --8323329-1219487617-1595925347=:4307 Content-Type: text/plain; name=drumbell_avb-patch_for_linux_5.8.rc6.txt; charset=us-ascii Content-Transfer-Encoding: BASE64 Content-ID: Content-Description: Content-Disposition: attachment; filename=drumbell_avb-patch_for_linux_5.8.rc6.txt LS0tIHNvdW5kL3VzYi9jbG9jay5jLm9yaWcJMjAyMC0wNy0yNSAyMzozOToy My42ODY5MTU5NTUgKzAyMDANCisrKyBzb3VuZC91c2IvY2xvY2suYwkyMDIw LTA3LTI2IDAwOjAzOjIwLjA3NzAzNDYyNiArMDIwMA0KQEAgLTE4Niw3ICsx ODYsOCBAQA0KIAkgKiBTYW1wbGUgcmF0ZSBjaGFuZ2VzIHRha2VzIG1vcmUg dGhhbiAyIHNlY29uZHMgZm9yIHRoaXMgZGV2aWNlLiBDbG9jaw0KIAkgKiB2 YWxpZGl0eSByZXF1ZXN0IHJldHVybnMgZmFsc2UgZHVyaW5nIHRoYXQgcGVy aW9kLg0KIAkgKi8NCi0JaWYgKGNoaXAtPnVzYl9pZCA9PSBVU0JfSUQoMHgw N2ZkLCAweDAwMDQpKSB7DQorICBpZiAoY2hpcC0+dXNiX2lkID09IFVTQl9J RCgweDA3ZmQsIDB4MDAwNCkgfHwNCisgICAgICBjaGlwLT51c2JfaWQgPT0g VVNCX0lEKDB4MDdmZCwgMHgwMDA1KSkgew0KIAkJY291bnQgPSAwOw0KIA0K IAkJd2hpbGUgKCghcmV0KSAmJiAoY291bnQgPCA1MCkpIHsNCi0tLSBzb3Vu ZC91c2IvcGNtLmMub3JpZwkyMDIwLTA3LTI1IDIzOjQyOjU3LjI2NzE5Njgx OSArMDIwMA0KKysrIHNvdW5kL3VzYi9wY20uYwkyMDIwLTA3LTI1IDIzOjQy OjI4Ljk1ODU3Nzc5OCArMDIwMA0KQEAgLTM2Niw2ICszNjYsMTAgQEANCiAJ CWVwID0gMHg4NDsNCiAJCWlmbnVtID0gMDsNCiAJCWdvdG8gYWRkX3N5bmNf ZXBfZnJvbV9pZm51bTsNCisgIGNhc2UgVVNCX0lEKDB4MDdmZCwgMHgwMDA1 KTogLyogTU9UVSBBVkIgU2VyaWVzICovDQorICAgIGVwID0gMHg4NzsNCisg ICAgaWZudW0gPSAyOw0KKyAgICBnb3RvIGFkZF9zeW5jX2VwX2Zyb21faWZu dW07DQogCWNhc2UgVVNCX0lEKDB4MDdmZCwgMHgwMDA4KTogLyogTU9UVSBN IFNlcmllcyAqLw0KIAljYXNlIFVTQl9JRCgweDMxZTksIDB4MDAwMik6IC8q IFNvbGlkIFN0YXRlIExvZ2ljIFNTTDIrICovDQogCWNhc2UgVVNCX0lEKDB4 MGQ5YSwgMHgwMGRmKTogLyogUlRYNjAwMSAqLw0K --8323329-1219487617-1595925347=:4307--