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Subject: RE: [PATCH][i386] HPET setup, duplicate HPET_T0_CMP needed for some platforms
Date: Mon, 7 Feb 2005 11:47:00 -0800
Message-ID: <88056F38E9E48644A0F562A38C64FB6003F3456F@scsmsx403.amr.corp.intel.com>
Thread-Topic: [PATCH][i386] HPET setup, duplicate HPET_T0_CMP needed for some platforms
Thread-Index: AcUMZSKN9Y4IQRrKSWGe3ctZh6p69AA5/8/g
From: "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>
To: "Giuseppe Bilotta" <bilotta78@hotpop.com>, <linux-kernel@vger.kernel.org>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1072
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>-----Original Message-----
>From: linux-kernel-owner@vger.kernel.org 
>[mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of 
>Giuseppe Bilotta
>Sent: Sunday, February 06, 2005 7:59 AM
>To: linux-kernel@vger.kernel.org
>Subject: Re: [PATCH][i386] HPET setup, duplicate HPET_T0_CMP 
>needed for some platforms
>
>Venkatesh Pallipadi wrote:
>> +	/* 
>> +	 * Some systems seems to need two writes to HPET_T0_CMP, 
>> +	 * to get interrupts working
>> +	 */
>> +	hpet_writel(tick, HPET_T0_CMP);
>>  	hpet_writel(tick, HPET_T0_CMP);
>
>Is it known which platforms require two, and which ones require 
>one write? Is it cost-effective to #if CONFIG_ the second 
>write?

Additional write should not be performace critical, as this code is
called
only once, during boot up (and again during system suspend-resume).

Thanks,
Venki
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