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=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 6F34AC433E5 for ; Thu, 16 Jul 2020 14:26:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 56C62206F4 for ; Thu, 16 Jul 2020 14:26:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728906AbgGPO0g (ORCPT ); Thu, 16 Jul 2020 10:26:36 -0400 Received: from bhuna.collabora.co.uk ([46.235.227.227]:46208 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728182AbgGPO0f (ORCPT ); Thu, 16 Jul 2020 10:26:35 -0400 Received: from [IPv6:2a01:e35:2fb5:1510:95f7:ce7f:fb76:c54a] (unknown [IPv6:2a01:e35:2fb5:1510:95f7:ce7f:fb76:c54a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: aferraris) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id 0879D261064; Thu, 16 Jul 2020 15:26:32 +0100 (BST) Subject: Re: [PATCH 0/4] ASoC: fsl_asrc: allow selecting arbitrary clocks To: Mark Brown , Nicolin Chen Cc: alsa-devel@alsa-project.org, Timur Tabi , Xiubo Li , linux-kernel@vger.kernel.org, Takashi Iwai , Liam Girdwood , Rob Herring , kernel@collabora.com, Fabio Estevam References: <20200702142235.235869-1-arnaud.ferraris@collabora.com> <20200702184226.GA23935@Asurada-Nvidia> <3f39a0bb-a766-f646-28b3-a51cf9983c6b@collabora.com> <3fea8912-63df-ff27-0c29-6284a85107ab@collabora.com> <20200714201544.GA10501@Asurada-Nvidia> <20200714202753.GM4900@sirena.org.uk> <20200714205050.GB10501@Asurada-Nvidia> <20200715140519.GH5431@sirena.org.uk> <20200715210308.GA14589@Asurada-Nvidia> <20200716121821.GA5105@sirena.org.uk> From: Arnaud Ferraris Autocrypt: addr=arnaud.ferraris@collabora.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20200716121821.GA5105@sirena.org.uk> Content-Type: text/plain; charset=windows-1252 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 Le 16/07/2020 à 14:18, Mark Brown a écrit : > On Wed, Jul 15, 2020 at 02:03:08PM -0700, Nicolin Chen wrote: >> On Wed, Jul 15, 2020 at 03:05:19PM +0100, Mark Brown wrote: >>> On Tue, Jul 14, 2020 at 01:50:50PM -0700, Nicolin Chen wrote: > >>>> Thanks for the input. Fox i.MX6, I don't feel it would be that >>>> drastically different though. And both SSI1 and SSI2 can simply >>>> select the same root clock source to avoid that happen. > >>> If you've got two radios that both need to sync to some radio derived >>> frequency it gets a bit more entertaining. > >> I'm simply curious what could be a problem. Do you mind educating >> me a bit? And ASRC here isn't a radio but a sample rate converter >> working as a BE in DPCM setup, using radio-capture for example... > > My understanding was that this application was using the ASRC to convert > between the sample rates of two different radios - the rates may be > nominaly the same but in practice different so the audio will glitch > after a while when the clocks drift far enough apart. That's part of the issues we had to solve, yes. The other part is more traditional sample rate conversion on an as-needed basis, as we can't assume which rate will be used (iPhone's use 16kHz, Android phones stick to 8kHz, and headsets can use both depending on their capabilities). 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Thu, 16 Jul 2020 16:26:40 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id A996EF801EC; Thu, 16 Jul 2020 16:26:38 +0200 (CEST) Received: from bhuna.collabora.co.uk (bhuna.collabora.co.uk [46.235.227.227]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 21054F8014C for ; Thu, 16 Jul 2020 16:26:33 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 21054F8014C Received: from [IPv6:2a01:e35:2fb5:1510:95f7:ce7f:fb76:c54a] (unknown [IPv6:2a01:e35:2fb5:1510:95f7:ce7f:fb76:c54a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: aferraris) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id 0879D261064; Thu, 16 Jul 2020 15:26:32 +0100 (BST) Subject: Re: [PATCH 0/4] ASoC: fsl_asrc: allow selecting arbitrary clocks To: Mark Brown , Nicolin Chen References: <20200702142235.235869-1-arnaud.ferraris@collabora.com> <20200702184226.GA23935@Asurada-Nvidia> <3f39a0bb-a766-f646-28b3-a51cf9983c6b@collabora.com> <3fea8912-63df-ff27-0c29-6284a85107ab@collabora.com> <20200714201544.GA10501@Asurada-Nvidia> <20200714202753.GM4900@sirena.org.uk> <20200714205050.GB10501@Asurada-Nvidia> <20200715140519.GH5431@sirena.org.uk> <20200715210308.GA14589@Asurada-Nvidia> <20200716121821.GA5105@sirena.org.uk> From: Arnaud Ferraris Autocrypt: addr=arnaud.ferraris@collabora.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20200716121821.GA5105@sirena.org.uk> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 8bit Cc: alsa-devel@alsa-project.org, Timur Tabi , Xiubo Li , linux-kernel@vger.kernel.org, Liam Girdwood , Takashi Iwai , Rob Herring , kernel@collabora.com, Fabio Estevam 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" Le 16/07/2020 à 14:18, Mark Brown a écrit : > On Wed, Jul 15, 2020 at 02:03:08PM -0700, Nicolin Chen wrote: >> On Wed, Jul 15, 2020 at 03:05:19PM +0100, Mark Brown wrote: >>> On Tue, Jul 14, 2020 at 01:50:50PM -0700, Nicolin Chen wrote: > >>>> Thanks for the input. Fox i.MX6, I don't feel it would be that >>>> drastically different though. And both SSI1 and SSI2 can simply >>>> select the same root clock source to avoid that happen. > >>> If you've got two radios that both need to sync to some radio derived >>> frequency it gets a bit more entertaining. > >> I'm simply curious what could be a problem. Do you mind educating >> me a bit? And ASRC here isn't a radio but a sample rate converter >> working as a BE in DPCM setup, using radio-capture for example... > > My understanding was that this application was using the ASRC to convert > between the sample rates of two different radios - the rates may be > nominaly the same but in practice different so the audio will glitch > after a while when the clocks drift far enough apart. That's part of the issues we had to solve, yes. The other part is more traditional sample rate conversion on an as-needed basis, as we can't assume which rate will be used (iPhone's use 16kHz, Android phones stick to 8kHz, and headsets can use both depending on their capabilities).