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

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Message-ID: <20120525082008.GH3332@S2101-09.ap.freescale.net>
Date:	Fri, 25 May 2012 16:20:10 +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 Fri, May 25, 2012 at 04:09:44PM +0800, Richard Zhao wrote:
> 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.
> 
It seems to be the case, so:

Acked-by: Shawn Guo <shawn.guo@...aro.org>

-- 
Regards,
Shawn
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