SUN6I a31 OPP table clock issue

[Maxime Ripard]

On Mon, Apr 09, 2018 at 01:35:42PM +0300, Sergey Suloev wrote:
> 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.

Your kernel version is marked as dirty in your logs, which means you
have local changes. So it doesn't really qualify as "as is".

> 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.

Could you add some printk's to ccu_mux_notifier_nb to see which
pointer is NULL?

Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com
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