linux-kernel - Re: [PATCH 06/18] power: ab8500_bm: Recharge condition not optimal for battery

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Message-ID: <20130116014442.GA17659@lizard.fhda.edu>
Date:	Tue, 15 Jan 2013 17:44:43 -0800
From:	Anton Vorontsov <anton.vorontsov@...aro.org>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	arnd@...db.de, linus.walleij@...ricsson.com,
	Marcus Cooper <marcus.xm.cooper@...ricsson.com>
Subject: Re: [PATCH 06/18] power: ab8500_bm: Recharge condition not optimal
 for battery

On Fri, Jan 11, 2013 at 01:12:54PM +0000, Lee Jones wrote:
> From: Marcus Cooper <marcus.xm.cooper@...ricsson.com>
> 
> Today the battery recharge is determined with a voltage threshold. This
> voltage threshold is only valid when the battery is relaxed. In charging
> algorithm the voltage read is the loaded battery voltage and no
> compensation is done to get the relaxed voltage. When maintenance
> charging is not selected, this makes the recharging condition to almost
> immediately activate when there is a discharge present on the battery.
> 
> Depending on which vendor the battery comes from this behavior can wear
> out the battery much faster than normal.
> 
> The fuelgauge driver is responsible to monitor the actual battery
> capacity and is able to estimate the remaining capacity. It is better to
> use the remaining capacity as a limit to determine when battery should
> be recharged.
> 
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> Signed-off-by: Marcus Cooper <marcus.xm.cooper@...ricsson.com>
> Reviewed-by: Hakan BERG <hakan.berg@...ricsson.com>
> Reviewed-by: Jonas ABERG <jonas.aberg@...ricsson.com>
> ---
> +	.maint_thres = 95,
>  	.user_cap_limit = 15,
>  	.maint_thres = 97,
>  };

95 or 97? These are both specified. I removed 97, assuming it was a merge
error on your side. But please double check, it could be that you really
want 97 here.
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