From: Jeff Garzik <jeff@garzik.org>
Date: Thu, 28 Feb 2008 20:43:48 +0000 (-0500)
Subject: ahci: work around ATI SB600 h/w quirk
X-Git-Tag: v2.6.25-rc5~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a878539ef994787c447a98c2e3ba0fe3dad984ec;p=pandora-kernel.git

ahci: work around ATI SB600 h/w quirk

This addresses the recent ATI SB600 errata, where the hardware does
not like 256-length PRD entries during FPDMA (aka NCQ).

It hurts performance on SB600, but it is more important to get a
correct patch eliminating the data corruption/lockups, and then later
on tune for performance.

We simply limit each command to a maximum of 255 sectors, on SB600.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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