From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eduardo Valentin Subject: Re: [PATCH 0/4] McBSP smart idle and DMA op mode updates for ASoC Date: Wed, 19 May 2010 14:46:40 +0300 Message-ID: <20100519114640.GP4265@besouro.research.nokia.com> References: <1274213594-26554-1-git-send-email-lrg@slimlogic.co.uk> <201005191131.58167.peter.ujfalusi@nokia.com> <20100519105227.GL4265@besouro.research.nokia.com> <201005191436.52149.peter.ujfalusi@nokia.com> Reply-To: eduardo.valentin@nokia.com Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Return-path: Received: from mgw-mx09.nokia.com (smtp.nokia.com [192.100.105.134]) by alsa0.perex.cz (Postfix) with ESMTP id 77AC71038ED for ; Wed, 19 May 2010 13:41:05 +0200 (CEST) Content-Disposition: inline In-Reply-To: <201005191436.52149.peter.ujfalusi@nokia.com> 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: "Ujfalusi Peter (Nokia-D/Tampere)" Cc: "alsa-devel@alsa-project.org" , Tony Lindgren , Mark Brown , "Valentin Eduardo (Nokia-D/Helsinki)" , "linux-omap@vger.kernel.org" , Liam Girdwood List-Id: alsa-devel@alsa-project.org On Wed, May 19, 2010 at 01:36:51PM +0200, Ujfalusi Peter (Nokia-D/Tampere) = wrote: > On Wednesday 19 May 2010 13:52:27 Valentin Eduardo (Nokia-D/Helsinki) wro= te: > > > The DMA pointer is easy, and it was know before as well, but accordin= g to > > > my tests, the McBSP FIFO caused delay reporting is fairly accurate. I= 'll > > > ask my users, if they have done some additional tests. > > = > > OK. fair enough. What if you really want to avoid the delay at all? > = > You can't. the McBSP FIFO can not be bypassed. > The only thing one can do is to take it into consideration. hmmm well, you can still do not use the fifo completely. Use only partially= depending on latency requirement would still be possible. > = > -- = > P=E9ter