linux-kernel - Re: [PATCH]AHCI: disable sntf cap for ich8

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Message-ID: <4B021646.5040102@garzik.org>
Date:	Mon, 16 Nov 2009 22:19:34 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Shaohua Li <shaohua.li@...el.com>
CC:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	jgarzik@...hat.com, sean.hefty@...el.com,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Alan Cox <alan@...ux.intel.com>
Subject: Re: [PATCH]AHCI: disable sntf cap for ich8

On 11/15/2009 08:56 PM, Shaohua Li wrote:
> I obseved there is a sata_async_notification() for every ahci interrupt. But the
> async notification does nothing (this is hard disk drive and no pmp). This cause
> cpu wastes some time on sntf register access.
>
> It appears ICH AHCI doesn't support SNotification register, but the controller
> reports it does. After quirking it, the async notification disappears.

Patch applied.


> PS. it appears all ICH don't support SNotification register from ICH manual, don't
> know if we need quirk all ICH. I don't have machines with all kinds of ICH.

You work for Intel -- you or somebody needs to research and figure this 
out...  This is an Intel vendor issue that only Intel can definitively 
resolve.

	Jeff


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