linux-kernel - RE: [git patches] libata fixes

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Message-ID: <001b01c7647c$921ced00$4b00a8c0@donald>
Date:	Mon, 12 Mar 2007 09:00:54 +0100
From:	"Paul Rolland" <rol@...917.net>
To:	"'Tejun Heo'" <htejun@...il.com>,
	"'Linus Torvalds'" <torvalds@...ux-foundation.org>
Cc:	"'Jeff Garzik'" <jeff@...zik.org>, "'Alan Cox'" <alan@...hat.com>,
	"'Andrew Morton'" <akpm@...ux-foundation.org>,
	<linux-ide@...r.kernel.org>,
	"'LKML'" <linux-kernel@...r.kernel.org>,
	"'Eric D. Mudama'" <edmudama@...il.com>
Subject: RE: [git patches] libata fixes

Hello,

> It involves a long timeout, so it's bothersome.  This is caused by
> Silicon Image 4726/3726 storage processor (SATA Port Multiplier with
> extra features) attached to one of the ICH ports.

Yes, I think this is the part Asus is using for it's EZ-Raid feature
on this motherboard, and they seem to like their EZ-Raid, so it's likely
to become more and more common.
 
> If the first  downstream port in the PMP is empty and it gets reset in
I confirm it is empty in my config.

> work very well with the current ATA reset sequence and gets identified
> only after a few failures thus causing long timeout.
30s to 1min ;(
 
> I keep forgetting about this.  I'll ask SIMG how to deal with 
> this.  For
> the time being, connecting a device to the PMP port should remove the
> timeouts.

That sounds a quite expensive solution ;)

Paul

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