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

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Date:	Fri, 25 May 2012 16:09:44 +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 11:33:58AM +0800, Shawn Guo wrote:
> On Thu, May 24, 2012 at 11:27:00AM +0800, Richard Zhao wrote:
> > > 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.
> > 
> No, it does not recover.
Maybe it's not the same issue. It do recover on imx6q sabrelite board.
And from source code, it do be a bug.

Thanks
Richard
> 
> -- 
> Regards,
> Shawn
> 

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