SUN6I a31 OPP table clock issue

Sergey Suloev ssuloev at orpaltech.com
Mon Apr 9 03:35:42 PDT 2018


On 04/09/2018 11:53 AM, Maxime Ripard wrote:
> On Sat, Apr 07, 2018 at 10:53:10PM +0300, Sergey Suloev wrote:
>> I was able to catch oops coming from OPP table on BananaPi M2.
>>
>> https://pastebin.com/ZRaXTtEx
>>
>> Let me know if need more detail.
> Of course we do.
>
> Which kernel version was this for? With which configuration? What
> makes you say it's related to the OPP table, is it a regression or
> something you just noticed?
Ok, first of all, I am having the problem using linus tree, 4.16 as it 
is, with no extra patches.
My config file is here [1].
The problem is easily avoided by just commenting all freqs out of the 
OPP table except for 1008 MHz, i.e. things work well when there is no 
freq switch at all.
It makes me think that there might be an issue in A31 clocks driver as 
it is the only important component used by cpufreq-dt.
As of cpufreq-dt driver it seems ok because works fine on other boards.

>
> Maxime
>
>
>
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[1] https://pastebin.com/eZxbra2f




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