From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jarkko Nikula Subject: Re: [PATCHv2 0/5] FIFO caused playback delay (latency) handling in soc/omap Date: Fri, 12 Mar 2010 10:30:50 +0200 Message-ID: <20100312103050.b83db5c4.jhnikula@gmail.com> References: <1267621689-30337-1-git-send-email-peter.ujfalusi@nokia.com> <20100311222655.GP2900@atomide.com> <186E584F-F553-44F0-A49D-361BB76E0EE4@opensource.wolfsonmicro.com> <201003120818.30290.peter.ujfalusi@nokia.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: Received: from mail-ew0-f220.google.com ([209.85.219.220]:49647 "EHLO mail-ew0-f220.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756460Ab0CLI3a (ORCPT ); Fri, 12 Mar 2010 03:29:30 -0500 Received: by ewy20 with SMTP id 20so374465ewy.1 for ; Fri, 12 Mar 2010 00:29:28 -0800 (PST) In-Reply-To: <201003120818.30290.peter.ujfalusi@nokia.com> Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Peter Ujfalusi Cc: ext Mark Brown , Tony Lindgren , "alsa-devel@alsa-project.org" , "linux-omap@vger.kernel.org" , "lrg@slimlogic.co.uk" , "Nurkkala Eero.An (EXT-Offcode/Oulu)" On Fri, 12 Mar 2010 08:18:30 +0200 Peter Ujfalusi wrote: > On Friday 12 March 2010 00:43:41 ext Mark Brown wrote: > > > I can do, though there was some debate about how useful the > > information the hardware returns actually is - could folks confirm > > what the consensus there was, please? > > Yeah, that thread went silent without final go or no go... > ... > All in all, I think the usage of the BUFFSTAT register is a good compromise for > all cases, and it is needed for the cases, where the codec also have buffer of > it's own. > And one point is that the BUFFSTAT use doesn't make things worse than currently. Now the application doesn't have any information about the HW buffer caused audio latencies so reporting them makes the things better than currently. -- Jarkko