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Date:   Fri, 6 Jul 2018 04:23:15 -0700
From:   Tony Lindgren <tony@atomide.com>
To:     Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Cc:     Pavel Machek <pavel@ucw.cz>, Ladislav Michl <ladis@linux-mips.org>,
        kernel list <linux-kernel@vger.kernel.org>,
        linux-pm@vger.kernel.org,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        linux-omap@vger.kernel.org, nekit1000@gmail.com, mpartap@gmx.net,
        merlijn@wizzup.org
Subject: Re: droid 4: connection refused from voltage_now
Message-ID: <20180706112315.GD112168@atomide.com>
References: <20180704171156.GA3158@amd>
 <20180704194556.GA9189@lenoch>
 <20180704195238.GA13932@amd>
 <20180706111628.mvh46mg6ctqia3iz@earth.universe>
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* Sebastian Reichel <sebastian.reichel@collabora.co.uk> [180706 11:19]:
> Hi,
> 
> On Wed, Jul 04, 2018 at 09:52:38PM +0200, Pavel Machek wrote:
> > On Wed 2018-07-04 21:45:56, Ladislav Michl wrote:
> > > On Wed, Jul 04, 2018 at 07:11:56PM +0200, Pavel Machek wrote:
> > > > Hi!
> > > > 
> > > > I started to use droid 4 as my primary phone... so I have battery
> > > > monitor running for hours... Once every few days it dies with
> > > > "connection refused" error reading battery's "voltage_now". I restart
> > > > it and it continues working...
> > > 
> > > Ha! What exactly that "connection refused" means? Is it ECONNREFUSED (111)?
> > > I have custom at91 based board here with few custom power supply drivers
> > > and it sometimes ends with voltage_now of my driver being unreadable.
> > > (I modified userspace code and waiting what's in errno in case
> > > reading fails)
> > 
> > It seems to be -110:
> > Jul  4 11:48:29 devuan kernel: [ 2908.602600] cpcap_adc cpcap_adc.0: error reading ADC: -110
> > Jul  4 11:48:29 devuan kernel: [ 2908.608123] cpcap_battery cpcap_battery.0: cpcap_battery_get_current failed: -110
> > Jul  4 11:48:30 devuan kernel: [ 2908.922576] cpcap_adc cpcap_adc.0: error reading ADC: -110
> > Jul  4 11:48:30 devuan kernel: [ 2908.928100] cpcap_battery cpcap_battery.0: cpcap_charger_battery_temperature failed: -110
> > Jul  4 11:48:30 devuan kernel: [ 2908.936340] power_supply battery: driver failed to report `voltage_now' property: -110
> 
> The error above is obviously generated by cpcap_adc and only
> propageted by cpcap_battery. Have a look for -ETIMEDOUT (-110)
> in drivers/iio/adc/cpcap-adc.c.

Hmm yeah maybe first try to increase the timeout value a bit
and see if that helps.

If increasing the timeout does not help, try reverting commit
9d965236fe9b ("iio: adc: cpcap: Remove hung interrupt quirk").

Regards,

Tony