linux-kernel - Re: [lm-sensors] [PATCH] hwmon: (applesmc) Shorten minimum wait time

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Message-ID: <20120709140748.GA12691@roeck-us.net>
Date:	Mon, 9 Jul 2012 07:07:48 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Henrik Rydberg <rydberg@...omail.se>
Cc:	Guenter Roeck <guenter.roeck@...csson.com>,
	linux-kernel@...r.kernel.org, lm-sensors@...sensors.org
Subject: Re: [lm-sensors] [PATCH] hwmon: (applesmc) Shorten minimum wait time

On Mon, Jul 09, 2012 at 12:10:26PM +0200, Henrik Rydberg wrote:
> The 2012 series of MacBooks have a faster SMC, and the current driver
> timings do not work at all. Tests show that decreasing the minimum
> wait time, from 64 us to 16 us, works well. Since this is still larger
> than the original minimum of 10 us used before 2008, there is nothing
> inherently problematic with changing it. The fail frequency on older
> machines seems to increase slightly, but not enough to be noticeable.
> 
> Tested on MBA11, MBA31, MBA5,2, MBP9,2.
> 
> The patch was originally written by adamski99 (ubuntuforums.org) and
> later tested by janhouse (bbs.archlinux.org).
> 
> Signed-off-by: Henrik Rydberg <rydberg@...omail.se>
> ---
> Hi Guenter,
> 
> This patch enables the mid-2012 MacBook models. The patch affects
> older models slightly, but mostly in a good way; all models get
> slightly faster reads, but some older models see a slight increase in
> read fail frequency. I do not think this will be noticeable, but I
> would hesitate to backport too far. For 3.6.
> 
Queued for 3.6.

Thanks,
Guenter
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