linux-kernel - Re: [PATCH] Add IDE mode support for SB600 SATA

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Date:	Fri, 24 Nov 2006 11:13:13 +0000
From:	Alan <alan@...rguk.ukuu.org.uk>
To:	Tejun Heo <htejun@...il.com>
Cc:	Conke Hu <conke.hu@....com>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...l.org>, Jeff Garzik <jeff@...zik.org>,
	arjan@...radead.org
Subject: Re: [PATCH] Add IDE mode support for SB600 SATA

> * Unlike Jmicron's case, this doesn't affect PCI bus scan.  Actually, it 
> does change class code but that's not as disruptive as Jmicron's case 
> and as long as ahci ignores class code, it doesn't really matter. 
> Driver can be chosen by changing loading order - this is both plus and 
> minus.

The load order is basically undefined. You want AHCI so we should do
this early. That means either putting the same gunk all over the kernel
(drivers/ide, drivers/ata/*ati* drivers/ata/ahci) or in one place.

> * As Arjan pointed out, that unlock-modify-lock sequence should be done 
> on resume too.  

The infrastructure for this is already handled by the pci resume quirk
patches I sent. 
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