[alsa-devel] [linux-sunxi] [BUG] On Allwinner A20 Board Cubietruck distorted SPDIF opical output

[Markus Mitsch]

2018-05-21 15:17 GMT+02:00 Maxime Ripard <maxime.ripard at bootlin.com>:
> On Mon, May 21, 2018 at 02:43:55PM +0200, Markus Mitsch wrote:
>> 2018-05-21 11:43 GMT+02:00 Markus Mitsch <markusmitsch86 at googlemail.com>:
>> >>> Hello,
>> >>>
>> >>> i have a new problem. if i want to output sound from optical i get
>> >>> distorted sound. At 44.1 khz its like an old vinly, but at 48 khz and
>> >>> higher it is very bad. thanks in advance for your time.
>> >
>> >> Hi Markus,
>> >> I haven't tested it for a while but when I did it worked as high as
>> >> 96K with no issues. Does it work ok with the original cubietruck
>> >> software?,
>> >> CK
>> >
>> > Hello,
>> > i am using arch linux with mainline kernel 4.16.8. parhaps i can try
>> > today with official image.
>> > mfg
>>
>> Hi.
>> So, with debian image from 2014 with 3.4.79 kernel the sound is clear
>> up to 96 khz.
>
> You said that it is a new problem, when was it introduced? Could you
> bisect the issue?
>
> Maxime

Hello.
I dont know since when this problem appears. When saying "new" i
refered to my older post. I tried to look into the dts file and the
code
but i am afraid this is a bit too high for me. I can say that the
analog output works, even at high sampling rates.
And I have read something about a clock source could be the problem.
I'm sorry I can't tell you any more.

mfg
Markus