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=-4.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 9F0ABC433DF for ; Mon, 3 Aug 2020 16:57:38 +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 2633520722 for ; Mon, 3 Aug 2020 16:57:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alsa-project.org header.i=@alsa-project.org header.b="P6bOMlHS" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2633520722 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.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 A8945165E; Mon, 3 Aug 2020 18:56:47 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz A8945165E DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1596473857; bh=bfFq5fzNsmQ/2kpHQv16nK4V1Vqs/OQ7Kttmznrowd0=; h=Date:From:To:Subject:In-Reply-To:References:Cc:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=P6bOMlHSX+E/b/oPWcMtz13wR+LgWmOjYmOnvwM5yOKo80Xwvq+AXeT9m+YEX279J wOlk6X0VJjeDSE50D6lDLvWQgQZPorF+mJEcO9NWAyTusCkZufSsV2x2E2pP3wrlxf UZQg1yjCbFCgZDqE5knuOoZ0clSHPyqslV/BuTgk= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 3EE89F801F7; Mon, 3 Aug 2020 18:56:47 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 08543F80218; Mon, 3 Aug 2020 18:56:45 +0200 (CEST) Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 4C40BF80148 for ; Mon, 3 Aug 2020 18:56:34 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 4C40BF80148 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 19217AB71; Mon, 3 Aug 2020 16:56:49 +0000 (UTC) Date: Mon, 03 Aug 2020 18:56:33 +0200 Message-ID: From: Takashi Iwai To: "Lu, Brent" Subject: Re: [PATCH v3 2/2] ASoC: Intel: Add period size constraint on strago board In-Reply-To: References: <1596020585-11517-1-git-send-email-brent.lu@intel.com> <1596198365-10105-1-git-send-email-brent.lu@intel.com> <1596198365-10105-3-git-send-email-brent.lu@intel.com> <63bca214-3434-16c6-1b60-adf323aec554@linux.intel.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.8 Emacs/25.3 (x86_64-suse-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII Cc: Guennadi Liakhovetski , "alsa-devel@alsa-project.org" , Kai Vehmanen , Kuninori Morimoto , "linux-kernel@vger.kernel.org" , "yuhsuan@google.com" , Takashi Iwai , Jie Yang , "Rojewski, Cezary" , Pierre-Louis Bossart , Liam Girdwood , Sam McNally , Mark Brown , Ranjani Sridharan , Daniel Stuart , Andy Shevchenko , Yu-Hsuan Hsu , Damian van Soelen 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: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" On Mon, 03 Aug 2020 18:45:29 +0200, Lu, Brent wrote: > > > > Hi Takashi, > > > > > > I've double checked with google. It's a must for Chromebooks due to > > > low latency use case. > > > > I wonder if there's a misunderstanding here? > > > > I believe Takashi's question was "is this a must to ONLY accept 240 samples > > for the period size", there was no pushback on the value itself. > > Are those boards broken with e.g. 960 samples? > > I've added google people to discuss directly. > > Hi Yuhsuan, > Would you explain why CRAS needs to use such short period size? Thanks. For avoid further misunderstanding: it's fine that CRAS *uses* such a short period. It's often required for achieving a short latency. However, the question is whether the driver can set *only* this value for making it working. IOW, if we don't have this constraint, what actually happens? If the driver gives the period size alignment, wouldn't CRAS choose 240? Takashi