From: arnd@arndb•de (Arnd Bergmann)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 04/18] power: ab8500_fg: Replace msleep() with usleep_range() for greater accuracy
Date: Tue, 15 Jan 2013 13:23:28 +0000 [thread overview]
Message-ID: <201301151323.28879.arnd@arndb.de> (raw)
In-Reply-To: <20130115084821.GT12385@gmail.com>
On Tuesday 15 January 2013, Lee Jones wrote:
> > > @@ -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.
>
> I can't increase the tolerance, as I don't know how that would
> effect the running of the system, and the person who would know
> is off on parental leave.
The function only averages the voltage between a couple of readings.
It won't change much if those register reads are slightly more
uniformly timed. Note that the thread can still be preempted for
a much longer time if anything else is running, and the entire
interrupt handling in this driver looks so fragile that I would
not rely on the interrupt actually happening at the right time
anyway. I think it should first be debugged properly to remove
the need for the enable_irq/disable_irq calls.
Arnd
next prev parent reply other threads:[~2013-01-15 13:23 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-11 13:12 [PATCH 00/18] AB8500 battery management series upgrade Lee Jones
2013-01-11 13:12 ` [PATCH 01/18] power: ab8500_charger: Rename the power_loss function Lee Jones
2013-01-11 13:12 ` [PATCH 02/18] power: ab8500_bm: Skip first CCEOC irq for instant current Lee Jones
2013-01-11 13:12 ` [PATCH 03/18] power: ab8500_charger: Detect charger removal Lee Jones
2013-01-16 1:36 ` Anton Vorontsov
2013-01-16 8:48 ` Lee Jones
2013-01-11 13:12 ` [PATCH 04/18] power: ab8500_fg: Replace msleep() with usleep_range() for greater accuracy Lee Jones
2013-01-14 17:17 ` Joe Perches
2013-01-15 8:48 ` Lee Jones
2013-01-15 8:59 ` Linus Walleij
2013-01-15 13:23 ` Arnd Bergmann [this message]
2013-01-15 13:52 ` Lee Jones
2013-01-15 14:09 ` Lee Jones
2013-01-11 13:12 ` [PATCH 05/18] power: ab8500_charger: Handle gpadc errors Lee Jones
2013-01-11 13:12 ` [PATCH 06/18] power: ab8500_bm: Recharge condition not optimal for battery Lee Jones
2013-01-16 1:44 ` Anton Vorontsov
2013-01-16 8:47 ` Lee Jones
2013-01-11 13:12 ` [PATCH 07/18] power: ab8500_fg: balance IRQ enable Lee Jones
2013-01-11 13:12 ` [PATCH 08/18] power: ab8500_btemp: Allign battery temperature resolution with the framework Lee Jones
2013-01-11 13:12 ` [PATCH 09/18] power: ab8500_btemp: Ignore false btemp low interrupt Lee Jones
2013-01-11 13:12 ` [PATCH 10/18] power: ab8500_bm: Adds support for Car/Travel Adapters Lee Jones
2013-01-11 13:12 ` [PATCH 11/18] power: ab8500_fg: Round capacity output Lee Jones
2013-01-11 13:13 ` [PATCH 12/18] power: ab8500_btemp: remove superfluous BTEMP thermal comp Lee Jones
2013-01-11 13:13 ` [PATCH 13/18] power: ab8500_fg: Added support for BATT_OVV Lee Jones
2013-01-11 13:13 ` [PATCH 14/18] power: pm2301: Add pm2301 charger Lee Jones
2013-01-16 1:37 ` Anton Vorontsov
2013-01-11 13:13 ` [PATCH 15/18] power: ab8500_charger: remove unused defines Lee Jones
2013-01-11 13:13 ` [PATCH 16/18] power: ab8500_charger: Adds support for legacy USB chargers Lee Jones
2013-01-11 13:13 ` [PATCH 17/18] Power: ab8500_fg: Overflow in current calculation Lee Jones
2013-01-11 13:13 ` [PATCH 18/18] power: ab8500_fg: Remove pointless round_jiffies() call Lee Jones
2013-01-16 1:48 ` [PATCH 00/18] AB8500 battery management series upgrade Anton Vorontsov
2013-01-16 8:50 ` Lee Jones
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=201301151323.28879.arnd@arndb.de \
--to=arnd@arndb$(echo .)de \
--cc=linux-arm-kernel@lists$(echo .)infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox