linux-kernel - Re: [PATCH 04/18] power: ab8500_fg: Replace msleep() with usleep

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Date:	Mon, 14 Jan 2013 09:17:37 -0800
From:	Joe Perches <joe@...ches.com>
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,
	cbouatmailru@...il.com, Jonas Aaberg <jonas.aberg@...ricsson.com>
Subject: Re: [PATCH 04/18] power: ab8500_fg: Replace msleep() with
 usleep_range() for greater accuracy

On Fri, 2013-01-11 at 13:12 +0000, Lee Jones wrote:
> Doing so provides a greater degree of accuracy when dealing with
> time-frames between 1us and 20ms. msleep() is only accurate for
> wake-ups greater than 20ms.
[]
> diff --git a/drivers/power/ab8500_fg.c b/drivers/power/ab8500_fg.c
[]
> @@ -956,7 +956,7 @@ static int ab8500_fg_load_comp_volt_to_capacity(struct ab8500_fg *di)
>  	do {
>  		vbat += ab8500_fg_bat_voltage(di);
>  		i++;
> -		msleep(5);
> +		usleep_range(5000, 5001);

If you're going to give a range that small
you might as well use usleep instead.

Otherwise, add some tolerance to allow any
other coalesced wakeup to occur.


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