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

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Message-ID: <20120524032026.GB17621@S2101-09.ap.freescale.net>
Date:	Thu, 24 May 2012 11:20:29 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Richard Zhao <richard.zhao@...escale.com>
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 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)
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