From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1755391Ab1LZMMO (ORCPT <rfc822;w@1wt.eu>);
	Mon, 26 Dec 2011 07:12:14 -0500
Received: from opensource.wolfsonmicro.com ([80.75.67.52]:46834 "EHLO
	opensource.wolfsonmicro.com" rhost-flags-OK-OK-OK-OK)
	by vger.kernel.org with ESMTP id S1755332Ab1LZMMM (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Mon, 26 Dec 2011 07:12:12 -0500
Date: Mon, 26 Dec 2011 12:12:08 +0000
From: Mark Brown <broonie@opensource.wolfsonmicro.com>
To: Tomoya MORINAGA <tomoya.rohm@gmail.com>
Cc: Liam Girdwood <lrg@ti.com>, Jaroslav Kysela <perex@perex.cz>,
        Takashi Iwai <tiwai@suse.de>, Lars-Peter Clausen <lars@metafoo.de>,
        Dimitris Papastamos <dp@opensource.wolfsonmicro.com>,
        Mike Frysinger <vapier@gentoo.org>, Daniel Mack <zonque@gmail.com>,
        alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org,
        qi.wang@intel.com, yong.y.wang@intel.com, joel.clark@intel.com,
        kok.howg.ewe@intel.com
Subject: Re: [PATCH 3/3 v2] sound/soc/lapis: add platform driver for ML7213
 IOH I2S
Message-ID: <20111226121207.GF8722@opensource.wolfsonmicro.com>
References: <1324349144-12784-1-git-send-email-tomoya.rohm@gmail.com>
 <1324349144-12784-3-git-send-email-tomoya.rohm@gmail.com>
 <20111220132314.GQ2866@opensource.wolfsonmicro.com>
 <CANKRQng8N3oS2o17HPUZeonXB3KLBK9oNQj-zd9+aUUvWcTo0A@mail.gmail.com>
 <20111222005816.GB27144@opensource.wolfsonmicro.com>
 <CANKRQnjCTAX02wJt7StjB0rXkg3Q6bPBRYCbkgq6vS5NFd97Fg@mail.gmail.com>
 <20111222103946.GA4546@opensource.wolfsonmicro.com>
 <CANKRQng+H4NxaSLpZpYOCT-CdovxbToT-waz0JNMFT2AcD_gvA@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CANKRQng+H4NxaSLpZpYOCT-CdovxbToT-waz0JNMFT2AcD_gvA@mail.gmail.com>
X-Cookie: You are fairminded, just and loving.
User-Agent: Mutt/1.5.21 (2010-09-15)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Mon, Dec 26, 2011 at 03:33:29PM +0900, Tomoya MORINAGA wrote:
> 2011/12/22 Mark Brown <broonie@opensource.wolfsonmicro.com>:

> >> Not sorted but queuing only.
> >> In sound/voice control system, queuing is not rare, I think.
> >> If necessary, though this method is very common, I can send the method
> >> of the queue.

> > No, please describe the problem you're trying to fix.

> When CPU is heavy load, this buffer is useful.
> The heavy load causes delaying receiving processing.
> If there is no buffer, stream sound/voice can be broken.
> If there is the buffer, it can prevent the broken sound.

So you're just talking about standard underflows if the application
can't keep up?  There's *no* reason for your driver to do anything about
this, it's a really basic thing that affects all audio hardware.  Just
write a driver for the hardware.