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

[Bo Shen]

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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