From: Richard Zhao <richard.zhao@freescale.com>
To: Shawn Guo <shawn.guo@linaro.org>
Cc: <linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>, <vinod.koul@intel.com>,
<dan.j.williams@intel.com>, <linuxzsc@gmail.com>,
<shawn.guo@gmail.com>, <kernel@pengutronix.de>
Subject: Re: [PATCH 1/1] dma: imx-sdma: buf_tail should be initialize in prepare function
Date: Thu, 24 May 2012 11:27:00 +0800 [thread overview]
Message-ID: <20120524032659.GA19682@b20223-02.ap.freescale.net> (raw)
In-Reply-To: <20120524032026.GB17621@S2101-09.ap.freescale.net>
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@linaro-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@linaro-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
next prev parent reply other threads:[~2012-05-24 3:27 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-21 12:31 Richard Zhao
2012-05-22 10:43 ` Richard Zhao
2012-05-24 3:20 ` Shawn Guo
2012-05-24 3:27 ` Richard Zhao [this message]
2012-05-24 3:33 ` Shawn Guo
2012-05-25 8:09 ` Richard Zhao
2012-05-25 8:20 ` Shawn Guo
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