From: Tejun Heo <tj@kernel.org>
Date: Tue, 15 Sep 2009 19:18:03 +0000 (+0900)
Subject: ahci: filter FPDMA non-zero offset enable for Aspire 3810T
X-Git-Tag: v2.6.32-rc4~23^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f80ae7e45a0e03da188494c6e947a5c8b0cdfb4a;p=pandora-kernel.git

ahci: filter FPDMA non-zero offset enable for Aspire 3810T

Curiously, Aspire 3810T issues many SATA feature enable commands via
_GTF, of which one is invalid and another is not supported by the
drive.  In the process, it also enables FPDMA non-zero offset.
However, the feature also needs to be supported and enabled from the
controller and it's wrong to enable it from _GTF unless the controller
can do it by default.

Currently, this ends up enabling FPDMA non-zero offset only on the
drive side leading to NCQ command failures and eventual disabling of
NCQ.  This patch makes libata filter out FPDMA non-zero offset enable
for the machine.

This was reported by Marcus Meissner in bnc#522790.

  https://bugzilla.novell.com/show_bug.cgi?id=522790

Reported-by: Marcus Meissner <meissner@novell.com>

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