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Message-Id: <1265311335.16916.586.camel@localhost.localdomain> Date: Thu, 04 Feb 2010 11:22:15 -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 11:11 -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? There is a chipset ICH9/10 errata where it returns a previous value, instead of most recently written value. I had a patch for that here. http://marc.info/?l=linux-kernel&m=125849385330302&w=2 I wanted to send out final patch with a pointer to ICH9/10 spec update which describes the errata. But, look like that spec update hasn't happened yet. As we found issue with atleast one chipset with this warn_on, I would prefer retaining it, with a fix like above. Thanks, Venki -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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