From: Jeff Garzik <jeff@garzik.org>
To: Tejun Heo <tj@kernel.org>
Cc: IDE/ATA development list <linux-ide@vger.kernel.org>,
"Zhao, Richard" <Richard.Zhao@amd.com>,
shane.huang@amd.com
Subject: Re: [PATCH RFC] ahci: implement handoff quirk
Date: Sat, 11 Apr 2009 12:54:51 -0400 [thread overview]
Message-ID: <49E0CB5B.3070807@garzik.org> (raw)
In-Reply-To: <485882FE.1060409@kernel.org>
Tejun Heo wrote:
> ahci 1.2 has an exciting! new feature called BIOS/OS handoff which
> basically is there to allow BIOS to keep tinkering with the controller
> even after OS starts executing. I have no idea what this is useful
> for but it's there and we need to do it.
>
> This patch implements the handoff as FIXUP_HEADER as the controller
> needs to be claimed before the OS changes any configuration including
> IRQ routing.
>
> I'm yet to see any controller which actually requires this, so it's
> not for inclusion yet. Maybe keep this in a separate branch?
>
> RFC, DON'T COMMIT
We probably need to do this...
it's not a controller requirement but a BIOS one, so in theory even an
existing, deployed AHCI 1.2 platform could suddenly require BIOS/OS
handoff, if a BIOS update suddenly starts doing new and weird stuff in SMI.
Note that we need to do BIOS/OS handoff upon resume as well as at boot time.
Jeff
next prev parent reply other threads:[~2009-04-11 16:54 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-18 3:37 [PATCH RFC] ahci: implement handoff quirk Tejun Heo
2009-04-11 16:54 ` Jeff Garzik [this message]
2009-04-11 17:51 ` Tejun Heo
2009-04-11 18:02 ` Jeff Garzik
2009-04-14 9:16 ` Tejun Heo
2009-04-14 9:41 ` Jeff Garzik
2009-04-15 1:54 ` Huang, Shane
2009-12-17 6:34 ` Jeff Garzik
2009-12-18 3:54 ` Robert Hancock
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