linux-kernel - Re: Fwd: Re: [PATCH 2/2] ARM: mvebu: dts: Add dts file for DLink DNS-327L

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Message-ID: <b172d775afa24cea69a9490f531c6b37@mail.ncrmnt.org>
Date:	Sun, 12 Apr 2015 18:41:31 +0300
From:	Andrew <andrew@...mnt.org>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Linus Walleij <linus.walleij@...aro.org>,
	Wolfram Sang <wsa@...-dreams.de>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	Jason Cooper <jason@...edaemon.net>
Subject: Re: Fwd: Re: [PATCH 2/2] ARM: mvebu: dts: Add dts file for DLink  DNS-327L

Andrew Lunn писал 12.04.2015 17:58:
>> Okay, got it.
>> I'll file a bug about this issue to the the bugzilla. However 
>> something
>> tells me it might not be cpuidle, but D-link. This one's sounds nasty
>> and it has been around since 3.16.x. How could it go unnoticed?
>> Unfortunately I have no other armada-370 hardware to test it.
> 
> Hi Andrew
> 
> A few of us here do have hardware to test with. Please give a detailed
> description of how you reproduce the issue, and your kernel
> configuration, if different from mvebu_v7_defconfig, or
> multi_v7_defconfig.
> 
> 	Thanks
> 		Andrew

arch/arm/configs/mvebu_v7_defconfig has CONFIG_ARM_MVEBU_V7_CPUIDLE=y,
so it should be sufficient to reproduce the issue. I first encountered
this issue using that very config and observed it on 2 DNS-327L boxes I
own.

All I have to do to trigger the bug - enable cpuidle driver and let the 
box
sit for some 4-12 hours, till it hard-freezes. If wdt is enabled - wdt 
reboot
will happen. With cpuidle disabled I hit 50+ days of uptime with no 
issue.

I have also attached the config that I used to reproduce this issue 
today
on 4.0-rc7. Just in case.

Since DNS-327L has no JTAG whatsoever there's little I can do to debug
this one myself. I had a feeling though it was somehow related to power
supply: e.g. non-stock power supply 'looked like' triggered the bug more
often. But poking with oscilloscope around all the power lines didn't 
show
any difference.

-- 
Regards,
Andrew

View attachment ".config" of type "text/plain" (94427 bytes)