linux-kernel - Re: [linux-sunxi] [PATCH v2 14/14] ARM: dts: sun8i: Enable DVFS on Orange Pi One

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Date:	Thu, 30 Jun 2016 17:53:08 +0200
From:	Ondřej Jirman <megous@...ous.com>
To:	Michal Suchanek <hramrach@...il.com>
Cc:	dev <dev@...ux-sunxi.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Russell King <linux@...linux.org.uk>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Chen-Yu Tsai <wens@...e.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [linux-sunxi] [PATCH v2 14/14] ARM: dts: sun8i: Enable DVFS on
 Orange Pi One

On 30.6.2016 17:50, Michal Suchanek wrote:
> On 30 June 2016 at 17:16, Michal Suchanek <hramrach@...il.com> wrote:
>> On 30 June 2016 at 16:19, Ondřej Jirman <megous@...ous.com> wrote:
>>> Hello,
>>>
>>> On 30.6.2016 13:13, Michal Suchanek wrote:
>>>> Hello,
>>>>
>>>> On 25 June 2016 at 05:45,  <megous@...ous.com> wrote:
>>>>> From: Ondrej Jirman <megous@...ous.com>
>>>>>
>>>>> Use Xulong Orange Pi One GPIO based regulator for
>>>>> passive cooling and thermal management.
>>>>>
>>>>> Signed-off-by: Ondrej Jirman <megous@...ous.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@...V 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@...V 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.

Regulator output is TP1 on the bottom of the board, next ot the CSI
connector.

regards,
  Ondrej

> I will try with another PSU later.
> 
> Thanks
> 
> Michal
> 



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