linux-kernel - Re: [RFC PATCH 01/13] misc: atmel_ssc: add device tree DMA support

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Date:	Thu, 4 Jul 2013 09:15:00 +0800
From:	Bo Shen <voice.shen@...el.com>
To:	Richard Genoud <richard.genoud@...il.com>
CC:	<devicetree-discuss@...ts.ozlabs.org>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: Re: [RFC PATCH 01/13] misc: atmel_ssc: add device tree DMA support

Hi Richard,

On 7/3/2013 23:51, Richard Genoud wrote:
>> >but there's a violent hang (kernel stops, no trace) when I try the record :
>> >arecord -v -V stereo -Dplug:default -f cd -t wav -c 2 /tmp/toto.wav
>> >last thing I see is :
>> >dma dma0chan3: atc_control (3)

I don't meet this issue. Playback and recording works well on my side on 
at91sam9g35ek board.

>> >I'll try to trace that.
> I think it's DMA related.
> the last thing done by the kernel is:
>   i2c i2c-0: i2c_outb: 0x34 A
>   i2c i2c-0: i2c_outb: 0x0c A
>   i2c i2c-0: i2c_outb: 0x5a A
> meaning: enable power on, LINE IN, ADC, OSC, on the WM8731
> so, after that, data is comming from the codec to the SSC and then is
> handled by the DMA.
> there must be something nasty on the DMA bus to hang everything like that...

Will you try i2c without DMA support to test this issue?

> Richard.

Best Regards,
Bo Shen

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