Hi Martin,

   I recompiled integ branch with CONFIG_PWM_MESON=y and now DVFS is
working as expected.
I did some tests using sbc-bench:

* Original Odroid Ubuntu 16.04 with 3.10 kernel (1824MHz): http://ix.io/1zdB
* Armbian 5.75 with 5.0.0-rc5 kernel (1536MHz DVFS): http://ix.io/1APH

Original 3.10 kernel has a big big margin on tinymembench (about twice
as fast as 5.0.0-rc5 with DVFS); 3.10 is 50% faster in OpenSSL and
both kernels are tie on 7-zip (a bit faster 5.0.0-rc5). Do you have
any idea on how to explain the difference in tinymembench? I do not
think 300MHz overclocking is enough to explain the difference.

Attached the kernel-config I used to build kernel as reference and dmesg.

Thanks for your help.
*Ciao
Piero

Il giorno ven 8 feb 2019 alle ore 20:44 Martin Blumenstingl
<martin.blumenstingl@googlemail.com> ha scritto:
>
> Hi,
>
> On Thu, Feb 7, 2019 at 3:53 PM Piero <ottuzzi@gmail.com> wrote:
> >
> > Hi,
> >
> >    looking at linux-meson website[1] it looks like DVFS is available
> > for odroidc1 but from my test compiling 5.0.0-rc5 from amlogic integ
> > branch[2] I cannot see it working: what am I missing?
> can you please show us your kernel .config as well?
> I believe you're missing the PWM driver: CONFIG_PWM_MESON
>
> > Attached you can find dmesg.
> pwm-regulator regulator-vcck: Failed to get PWM: -517
> it's "OK" that this message is shown a few times (assuming you have
> CONFIG_PWM_MESON=m). Linux will solve it once modules are loaded, then
> you'll get the following message:
> pwm-regulator: supplied by regulator-dummy
> (from that point on "lscpu", "cpupower frequency-info" or other tools
> should show DVFS support)
>
>
> Regards
> Martin



-- 
Stupid is as stupid does.
Forrest Gump