Messages in this thread | | | From | Michal Suchanek <> | Date | Thu, 30 Jun 2016 17:50:25 +0200 | Subject | Re: [linux-sunxi] [PATCH v2 14/14] ARM: dts: sun8i: Enable DVFS on Orange Pi One |
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On 30 June 2016 at 17:16, Michal Suchanek <hramrach@gmail.com> wrote: > On 30 June 2016 at 16:19, Ondřej Jirman <megous@megous.com> wrote: >> Hello, >> >> On 30.6.2016 13:13, Michal Suchanek wrote: >>> Hello, >>> >>> On 25 June 2016 at 05:45, <megous@megous.com> wrote: >>>> From: Ondrej Jirman <megous@megous.com> >>>> >>>> Use Xulong Orange Pi One GPIO based regulator for >>>> passive cooling and thermal management. >>>> >>>> Signed-off-by: Ondrej Jirman <megous@megous.com> >>>> --- >>>> arch/arm/boot/dts/sun8i-h3-orangepi-one.dts | 39 +++++++++++++++++++++++++++++ >>>> 1 file changed, 39 insertions(+) >>>> >>>> diff --git a/arch/arm/boot/dts/sun8i-h3-orangepi-one.dts b/arch/arm/boot/dts/sun8i-h3-orangepi-one.dts >>>> index b1bd6b0..a38d871 100644 >>>> --- a/arch/arm/boot/dts/sun8i-h3-orangepi-one.dts >>>> +++ b/arch/arm/boot/dts/sun8i-h3-orangepi-one.dts >>>> @@ -109,6 +109,45 @@ >>>> }; >>>> }; >>>> >>>> +&cpu0 { >>>> + operating-points = < >>>> + /* kHz uV */ >>>> + 1296000 1300000 >>>> + 1200000 1300000 >>> >>> First problem is that the board boots at 1008000 which is not listed >>> and the kernel complains. >>> >>> Second problem is that the board locks up during boot with this enabled. >>> >>> Do you have some suggestion for alternate configuration to test? >> >> Just to verify, did you test with the entire series applied? (especially >> the PLL1 clk application changes) > > Yes, I applied the whole series. > >> >> You may try dropping the highest operating point, it's probably overly >> optimistic for Orange Pi One. >> >> Is the power supply/cable you're using hard enough? > > I use a 7 port hub to power the board. It worked with some other small > devboards. > > The cable is some random Chinese USB to power jack adaptor with an > extra adaptor to fit the Pi socket. It looks ok but I did not test > this particular combination thoroughly. > >> >> Where during the boot process does it lock up? > > Usually sometime around enabling cpufreq before getty starts. > Different runs and settings give slightly different results. In > particular adding the 1008000 point seems to make it go further. > > Removing all traces of the regulator, cpufreq and thermal I can boot > pretty much 100% to login prompt. > > I don't think the difference between 1GHz and 1.3GHz frequency on the > core would put much additional stress on the supply but I can try with > 35W PSU and some alternative cabling to be sure. > > I did some more tests and it seems 1008000@1.1V is fine but switching > to 1.3V crashes the board. Even with only the first 1.3V state. Maybe > there is need for some delay somewhere for the regulator to get > stable? >
Hm, the AW table shows 1008000@1.3V as supported state and it indeed works. So the voltage switching works or does nothing. Can I measure the regulator output somewhere? Clocking the chip higher does not work.
I will try with another PSU later.
Thanks
Michal
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