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

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Message-ID: <3d218e35-c848-53b3-e65f-df4b70c1e1f8@megous.com>
Date:	Fri, 22 Jul 2016 02:41:59 +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

Hello Michal,

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?

I've identified the problem as incorrectly set up gpio-regulator. During
boot, when it was probed, it would be initiualized with 1.1V for a
moment. This caused random non-specific lockups/crashes afterwards.

Fixed patches are in my branch on github, if you want to try again.

  https://github.com/megous/linux/commits/orange-pi-4.7

regards,
  o.

> Thanks
> 
> Michal
> 



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