linux-kernel - Re: Motorola Droid 4 -- Stopping charger when battery is full

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Date:   Thu, 13 Apr 2023 17:41:23 +0300
From:   Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
To:     Pavel Machek <pavel@....cz>
Cc:     kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, tony@...mide.com, sre@...nel.org,
        nekit1000@...il.com, mpartap@....net, merlijn@...zup.org,
        martin_rysavy@...trum.cz, phone-devel@...r.kernel.org,
        maemo-leste@...ts.dyne.org
Subject: Re: Motorola Droid 4 -- Stopping charger when battery is full



On 13.04.23 г. 12:34 ч., Pavel Machek wrote:
> Hi!
> 
>>> I complained that "battery life is very poor" with leste. It seems to
>>> be combination of several factors.
>>>
>>> 1) I was using very old battery
>>>
>>> 2) My charger is detected as "USB", not as "AC"
>>>
>>
>> And this is because there is no working charger detection in the driver, so
>> initial current limit is hard-coded to 500mA.
> 
> Aha, thanks, makes sense.
> 
>>> According to my measurements "CPCAP_REG_CRM_FET_OVRD |
>>> CPCAP_REG_CRM_FET_CTRL" results in battery discharding and 0A drawn
>>> frmo the USB.  "CPCAP_REG_CRM_FET_OVRD" is phone powered from USB,
>>> with battery more or less disconnected (<12mA), which is what we want
>>> in battery full situation.
>>>
>>
>> What will happen if phone needs to draw more than N mA (N is the set charger
>> current limit)?
> 
> We may run over the limit, AFAICT. I guess one solution would be to
> only do this when limit is high enough...
> 
> With current setup, phone will not boot if battery is empty, so this
> needs quite urgent solution.
> 
> I updated my leste, and now have:
> 
> user@...uan-droid4:~/g/droid4-linux$ uname -a
> Linux devuan-droid4 6.1.9 #1 SMP PREEMPT Mon Mar 20 15:16:53 UTC 2023 armv7l GNU/Linux
> user@...uan-droid4:~/g$ apt show linux-image-omap
> Package: linux-image-omap
> Version: 6.1.8.0-1+m7
> 
> Where can I find corresponding sources?
> 

https://github.com/maemo-leste/droid4-linux/tree/maemo-6.1.y

> Best regards,
> 							Pavel
>