linux-kernel - Re: [PATCH 1/1] acpi: battery: Accept charges over the design capacity as full

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Date:   Wed, 13 Oct 2021 13:33:59 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     André Almeida <andrealmeid@...labora.com>
Cc:     rjw@...ysocki.net, lenb@...nel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...labora.com,
        krisman@...labora.com, pgriffais@...vesoftware.com,
        hdegoede@...hat.com
Subject: Re: [PATCH 1/1] acpi: battery: Accept charges over the design
 capacity as full

Hi,

On Fri, Oct 08, 2021 at 12:05:29AM -0300, André Almeida wrote:
> Some buggy firmware and/or brand new batteries can support a charge that's
> slightly over the reported design capacity. In such cases, the kernel will
> report to userspace that the charging state of the battery is "Unknown",
> when in reality the battery charge is "Full", at least from the design
> capacity point of view. Make the fallback condition accepts capacities
> over the designed capacity so userspace knows that is full.
> 
> Signed-off-by: André Almeida <andrealmeid@...labora.com>
> ---
>  drivers/acpi/battery.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
> index dae91f906cea..8afa85d6eb6a 100644
> --- a/drivers/acpi/battery.c
> +++ b/drivers/acpi/battery.c
> @@ -169,7 +169,7 @@ static int acpi_battery_is_charged(struct acpi_battery *battery)
>  		return 1;
>  
>  	/* fallback to using design values for broken batteries */
> -	if (battery->design_capacity == battery->capacity_now)
> +	if (battery->design_capacity <= battery->capacity_now)
>  		return 1;
>  
>  	/* we don't do any sort of metric based on percentages */

Reviewed-by: Sebastian Reichel <sebastian.reichel@...labora.com>

-- Sebastian

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