linux-kernel - Re: [PATCH] HPET: Drop WARN_ON for mismatch on HPET CMP readback

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Date:	Thu, 04 Feb 2010 11:40:42 -0800
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] HPET: Drop WARN_ON for mismatch on HPET CMP readback

On Thu, 2010-02-04 at 11:32 -0800, Andi Kleen wrote:
> On Thu, Feb 04, 2010 at 11:22:15AM -0800, Pallipadi, Venkatesh wrote:
> > On Thu, 2010-02-04 at 11:11 -0800, Andi Kleen wrote:
> > >  HPET: Drop WARN_ON for mismatch on HPET CMP readback
> > >     
> > >     At least one Intel chipset seems to always return a constant value
> > >     when reading back the HPET CMP register. This triggers the WARN_ON_ONCE
> > >     on each boot.
> > 
> > I don't know of chipset returning a constant value. Which chipset is
> > this one?
> 
> Ibex Peak. That is I'm not sure it's fully constant, but at least
> it's always the same value on the HPET read triggering on boot.

OK. Yes. Ibexpeak is the same problem as ICH9, with reads not returning
the most recent write.

Thanks,
Venki


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