linux-kernel - Re: [PATCH v2] ARM: dts: sunxi: Add regulators for LeMaker BananaPi

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Message-ID: <7hzizu924y.fsf@deeprootsystems.com>
Date:	Wed, 07 Oct 2015 07:36:29 -0700
From:	Kevin Hilman <khilman@...nel.org>
To:	"Timo Sigurdsson" <public_timo.s@...entcreek.de>
Cc:	maxime.ripard@...e-electrons.com, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	linux@....linux.org.uk, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-sunxi@...glegroups.com, wens@...e.org,
	tyler.baker@...aro.org, olof@...om.net
Subject: Re: [PATCH v2] ARM: dts: sunxi: Add regulators for LeMaker BananaPi

"Timo Sigurdsson" <public_timo.s@...entcreek.de> writes:

> Kevin Hilman schrieb am 24.09.2015 19:57:
>> kernelci.org started finding boot faiulres[1] on bananapi linux-next
>> around next-20150918, but it was only failing in some labs and not
>> others.  I finally bisected it down to this patch, which landed in
>> linux-next in the form of 2d665a8a8350 ARM: dts: sunxi: Add regulators
>> for LeMaker BananaPi.  Reverting that commit on top of next-20150923
>> gets my bananapi booting again.
>> 
>> Note it's kind of an interesting boot failure.  The kernel boots fully
>> to a shell, but panics after running a few commands.  In particular
>> 'dmesg -n1' seems to trigger it usually[2].
>> 
>> Kevin
>> 
>> [1]
>> http://kernelci.org/boot/sun7i-a20-bananapi/job/next/kernel/next-20150923/defconfig/multi_v7_defconfig/lab/lab-khilman/?_id=5602504359b514be146c326f
>> [2]
>> http://storage.kernelci.org/next/next-20150923/arm-multi_v7_defconfig/lab-khilman/boot-sun7i-a20-bananapi.html
>
> following up on my last email: I'm back from my vacation and I tried to
> reproduce your problem, but my board doesn't seem to be affected, so I
> cannot trigger it.
>
> I still think that the lower voltages may be the cause of your problem
> with that specific board, so could you please test the attached patch on
> top of my patch that you first experienced the problem with? Please let 
> us know whether this solves your issue or whether we need to dig deeper.

Thanks for the patch.  Looks like it's the OPPs.

I went back to next-20150923 and verified it still fails.  Then, I
applied your patch and saw that it boots just fine.

Kevin
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