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=-5.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 CC554C433E0 for ; Fri, 12 Jun 2020 08:10:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 975E5207F7 for ; Fri, 12 Jun 2020 08:10:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ZK69Co/l" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726371AbgFLIKL (ORCPT ); Fri, 12 Jun 2020 04:10:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53916 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726264AbgFLIKK (ORCPT ); Fri, 12 Jun 2020 04:10:10 -0400 Received: from mail-pj1-x1044.google.com (mail-pj1-x1044.google.com [IPv6:2607:f8b0:4864:20::1044]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6A7F9C03E96F for ; Fri, 12 Jun 2020 01:10:10 -0700 (PDT) Received: by mail-pj1-x1044.google.com with SMTP id h95so3546879pje.4 for ; Fri, 12 Jun 2020 01:10:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=FrBOISxwKyWg3yFgNawz44Si/Jo/mcOoYEJcWJFfVoU=; b=ZK69Co/lXBcRsFD7SUsxis7MvrrcFiGb9wXzfn7QAfqobBYK9JDAVVUXXpRpFHMLg0 bvEppJLtKU+QvKbxuYgo0rxwsXP9WiA9uF0rGQy43dpzucJAnjc2IyzVcZ1ElnYntB7l ATrDNsHmMMemgc2y/R9TU7A9JQ3Ve8RNKb8SnaShfdenzGbXzILlFzjWK9lvsREaci4G VYteP+8a1FKn/dMhPPSzX5EuZSXt2zkupMCmExVRxk+qmMa3SQ8qmPp74Y8Ln/IZJW5M g+BVoCzM2yWQoUraZtQxS5HGxkw+Jgl24vvTzDytIgPnaEyNS+OHC2lqEYxJlor1u0zK Q1Mg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=FrBOISxwKyWg3yFgNawz44Si/Jo/mcOoYEJcWJFfVoU=; b=RvHMm+vBBcACqgn5EMhZYeESQ9FH9XnJdeeoe/sByGEVuuadPjnaStCnAf7E/5BQQE 5BOckRKngiF2FrvzirjU3SZibygFhHkreTRmxL9UVldWvArRutACDv6iAs7vOUlhVEh8 vt1sAmrdohwxaIRHLWnhKfajEUZaGSElepn5pLip9ce0yYragNJ6/SwaznOYlTiFOnzU 6OqlbsYJyrsF4Y3j/FkTSzC6ZUo7wFM7jxhdMTmNlqrVbdQ6+/eVlqX+byA2udJH3Pv3 QjCQkvLmxTQzXd3Zp+kAVtJ95+23pZ4PVv+TMLNwiZq1kkbjLyXzHlvi6gurofligxwg AmnA== X-Gm-Message-State: AOAM5329n64ymo2cUTT/EpSix9OJZLDFrE1zEB0zXHYEuhYHrFzb25HE J6ueJ1Buno3ge/KteRvYfE8= X-Google-Smtp-Source: ABdhPJyS8XQ1B9/rurFHEaifuL86DzzigqQvEbE5slis0FR6ePbWM33oVYWhL/dvgVit13H7C4fJKw== X-Received: by 2002:a17:902:bd09:: with SMTP id p9mr10817945pls.214.1591949409605; Fri, 12 Jun 2020 01:10:09 -0700 (PDT) Received: from Asurada-Nvidia (searspoint.nvidia.com. [216.228.112.21]) by smtp.gmail.com with ESMTPSA id 191sm4484589pfz.30.2020.06.12.01.10.09 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Fri, 12 Jun 2020 01:10:09 -0700 (PDT) Date: Fri, 12 Jun 2020 01:10:00 -0700 From: Nicolin Chen To: Shengjiu Wang Cc: lars@metafoo.de, perex@perex.cz, tiwai@suse.com, lgirdwood@gmail.com, broonie@kernel.org, timur@kernel.org, Xiubo.Lee@gmail.com, festevam@gmail.com, alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: Re: [RFC PATCH v3 4/4] ASoC: fsl_asrc_dma: Fix data copying speed issue with EDMA Message-ID: <20200612081000.GD22422@Asurada-Nvidia> References: <424ed6c249bafcbe30791c9de0352821c5ea67e2.1591947428.git.shengjiu.wang@nxp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <424ed6c249bafcbe30791c9de0352821c5ea67e2.1591947428.git.shengjiu.wang@nxp.com> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jun 12, 2020 at 03:37:51PM +0800, Shengjiu Wang wrote: > With EDMA, there is two dma channels can be used for dev_to_dev, > one is from ASRC, one is from another peripheral (ESAI or SAI). > > If we select the dma channel of ASRC, there is an issue for ideal > ratio case, the speed of copy data is faster than sample > frequency, because ASRC output data is very fast in ideal ratio > mode. > > So it is reasonable to use the dma channel of Back-End peripheral. > then copying speed of DMA is controlled by data consumption > speed in the peripheral FIFO, > > Signed-off-by: Shengjiu Wang Reviewed-by: Nicolin Chen