linux-kernel - Re: [patch]: fixing of pmtimer overflow that make Cx states time incorrect

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Date:	Mon, 9 Feb 2009 11:56:00 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	alex.shi@...el.com
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Len Brown <lenb@...nel.org>
Subject: Re: [patch]: fixing of pmtimer overflow that make Cx states time
 incorrect

On Mon, 02 Feb 2009 09:46:57 +0800
"alex.shi" <alex.shi@...el.com> wrote:

> Yagui want to give a clear explanation to be used for commitment. So I resend
> this again. 
> 
>     On most boxes the ACPI PM timer is 24-bit counter that runs on 3.579545MHz
> clock. In such case the max C-state sleep time should be less than 4687ms when
> it is used to record C2/C3 duration time. 
>     But on some boxes the max C-state sleep time is more than 4687ms. In such
> case the overflow happens and the C-state duration time can't be counted
> accurately.
> 
>     Use clocksource to get the C-state time instead of ACPI PM timer. and use
> div64_u64 to convert US_TO_PM_TIME_TICKS in i386 mode.

It seems that this bugfix was not applied, a cleanup patch was merged
instead and this patch is now wrecked.

I'll need to drop it, sorry.
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