linux-kernel - Re: [PATCH 3/3 v2] sound/soc/lapis: add platform driver for ML7213 IOH I2S

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Message-ID: <CANKRQnhJhpwhGywGz=r0tVF0k+eWb4vrGkdVD9NdzRFNo9PNtA@mail.gmail.com>
Date:	Tue, 27 Dec 2011 10:25:25 +0900
From:	Tomoya MORINAGA <tomoya.rohm@...il.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Liam Girdwood <lrg@...com>, Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>,
	Mike Frysinger <vapier@...too.org>,
	Daniel Mack <zonque@...il.com>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org, qi.wang@...el.com,
	yong.y.wang@...el.com, joel.clark@...el.com, kok.howg.ewe@...el.com
Subject: Re: [PATCH 3/3 v2] sound/soc/lapis: add platform driver for ML7213
 IOH I2S

2011/12/26 Mark Brown <broonie@...nsource.wolfsonmicro.com>:
> On Mon, Dec 26, 2011 at 03:33:29PM +0900, Tomoya MORINAGA wrote:
>> 2011/12/22 Mark Brown <broonie@...nsource.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?
No. not only underflow but overflow.

> 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.
In case driver layer doesn't have the function,
which part works for the under/overflow ? Application ? or nothing ?

tomoya
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