linux-kernel - Re: [PATCH 1/1] dma: imx-sdma: buf_tail should be initialize in prepare function

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Message-ID: <20120524032659.GA19682@b20223-02.ap.freescale.net>
Date:	Thu, 24 May 2012 11:27:00 +0800
From:	Richard Zhao <richard.zhao@...escale.com>
To:	Shawn Guo <shawn.guo@...aro.org>
CC:	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <vinod.koul@...el.com>,
	<dan.j.williams@...el.com>, <linuxzsc@...il.com>,
	<shawn.guo@...il.com>, <kernel@...gutronix.de>
Subject: Re: [PATCH 1/1] dma: imx-sdma: buf_tail should be initialize in
 prepare function

On Thu, May 24, 2012 at 11:20:29AM +0800, Shawn Guo wrote:
> On Mon, May 21, 2012 at 08:31:34PM +0800, Richard Zhao wrote:
> > This fix audio underrun issue. When SNDRV_PCM_TRIGGER_STOP
> > and SNDRV_PCM_TRIGGER_START, it calls prepare again. buf_tail
> > should be reset to zero.
> > So move buf_tail initialization into prepare function.
> > 
> I tried the patch on imx51, and it does not fix the issue for me.
> 
> Regards,
> Shawn
> 
> root@...aro-developer:~# aplay audio8k16S.wav
> Playing WAVE 'audio8k16S.wav' : Signed 16 bit Little Endian, Rate 8000 Hz, Stere
> o
> ^Z
> [1]+  Stopped                 aplay audio8k16S.wav
> root@...aro-developer:~# fg
> aplay audio8k16S.wav
> underrun!!! (at least 2034.382 ms long)
Does the audio playback recover? Without the patch, sometimes the
playback will have distortion and play too fast.

Thanks
Richard 

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