From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Brown Subject: Re: [PATCH 11/20] OMAP: McBSP: Add link DMA mode selection Date: Thu, 30 Jul 2009 14:47:25 +0100 Message-ID: <20090730134725.GA29631@rakim.wolfsonmicro.main> References: <1248958183-15015-5-git-send-email-eduardo.valentin@nokia.com> <1248958183-15015-6-git-send-email-eduardo.valentin@nokia.com> <1248958183-15015-7-git-send-email-eduardo.valentin@nokia.com> <1248958183-15015-8-git-send-email-eduardo.valentin@nokia.com> <1248958183-15015-9-git-send-email-eduardo.valentin@nokia.com> <1248958183-15015-10-git-send-email-eduardo.valentin@nokia.com> <1248958183-15015-11-git-send-email-eduardo.valentin@nokia.com> <1248958183-15015-12-git-send-email-eduardo.valentin@nokia.com> <20090730130442.GD9975@sirena.org.uk> <20090730132808.GA22978@esdhcp037198.research.nokia.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from opensource.wolfsonmicro.com ([80.75.67.52]:56253 "EHLO opensource2.wolfsonmicro.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750912AbZG3Nr0 (ORCPT ); Thu, 30 Jul 2009 09:47:26 -0400 Content-Disposition: inline In-Reply-To: <20090730132808.GA22978@esdhcp037198.research.nokia.com> Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Eduardo Valentin Cc: "linux-omap@vger.kernel.org" , "alsa-devel@vger.kernel.org" , Jarkko Nikula , "Nurkkala Eero.An (EXT-Offcode/Oulu)" , "Ujfalusi Peter (Nokia-D/Tampere)" On Thu, Jul 30, 2009 at 04:28:08PM +0300, Eduardo Valentin wrote: > On Thu, Jul 30, 2009 at 03:04:42PM +0200, ext Mark Brown wrote: > > Is this really something that people would want to tweak at runtime > > (except for test purposes)? > Yes, test purposes, bug also, the same link could be sometime used for low-power > playback while sometime for low-latency processing where as accurate as > possible DMA pointer position info is needed. Latency you *should* be able to infer from the application behaviour.