[alsa-devel] [PATCH 0/5] ASoC: fsl_ssi: Fixing various channel slips and bad samples insertions

[Caleb Crome]

On Thu, Jan 14, 2016 at 6:25 AM, Caleb Crome <caleb at crome.org> wrote:
> On Thu, Jan 14, 2016 at 12:40 AM, arnaud.mouiche at invoxia.com
> <arnaud.mouiche at invoxia.com> wrote:
>>
>> [..]
>>>
>>>
>>> SUCCESS!  So far...
>>
>> Great :)
>>
>> I'm preparing a v3 of my patches including the SOR register + rebased on top
>> of v4.4.
>> I will let you propose the water mark / maxburst patch.
>> But it looks obvious to me that triggering the DMA when only 2 words are
>> left in the FIFO can lead to DMA xruns at such data rate.
>>
>> The downside is an increased number of DMA requests.
>> So I don't know if you should propose a configuration through the device
>> tree, or a static configuration as done in your patch.
>>
>
> Sounds to me like the device tree is the right place for it. I'll submit an RFC.
>
> For some reason... looks like it can't yet quite keep up at 48kHz.  it
> was working reliably for a while, but now I can only get it reliable
> at 32kHz.  It seems it's the TX that's broken at 48k.
>
> I'll dig in to see where the failure is.
>
> -C

Okay, setting maxburst and  watermark to 4 instead of 8 seems to solve
the problem at 48kHz.

-Caleb