From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jarkko Nikula Subject: Re: [PATCH] ASoC: OMAP: Add checking to detect bufferless pcms Date: Wed, 22 Apr 2009 12:01:28 +0300 Message-ID: References: <49EE7962.6080008@samsung.com> <20090422084349.GB10356@sirena.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail-bw0-f215.google.com (mail-bw0-f215.google.com [209.85.218.215]) by alsa0.perex.cz (Postfix) with ESMTP id 0095824624 for ; Wed, 22 Apr 2009 11:01:29 +0200 (CEST) Received: by bwz11 with SMTP id 11so1690079bwz.32 for ; Wed, 22 Apr 2009 02:01:29 -0700 (PDT) In-Reply-To: <20090422084349.GB10356@sirena.org.uk> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@alsa-project.org Errors-To: alsa-devel-bounces@alsa-project.org To: Mark Brown Cc: kyungmin.park@samsung.com, alsa-devel@alsa-project.org, peter.ujfalusi@nokia.com, Joonyoung Shim , bhmin@samsung.com List-Id: alsa-devel@alsa-project.org On Wed, Apr 22, 2009 at 11:43 AM, Mark Brown wrote: > On Wed, Apr 22, 2009 at 11:30:32AM +0300, Jarkko Nikula wrote: > > > Is this something where DAI driver or another end of connection is used > to > > provide clocking and the whole setup is then controlled with ALSA PCM > API? > > Somehow I have the feeling that would there be a better way to achieve it > > than with dummy bufferless transfer? > > The host isn't transferring any data at all in these cases. Ideally > we'd support multiple platforms and there'd be a dummy platform driver > to go with the dummy DAI driver. > Probably it's better to extend this patch to other architectures as well (at least DaVinci) where possible in order to be more consistent. I just noticed that also PXA is having the same feature. -- Jarkko