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[libata] ahci: Restore SB600 SATA controller 64 bit DMA

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Community reported one SB600 SATA issue(BZ #9412), which led to 64 bit
DMA disablement for all SB600 revisions by driver maintainers with
commits c7a42156d9 and
4cde32fc4b.

But the root cause is ASUS M2A-VM system BIOS bug in old revisions
like 0901, while forcing into 32bit DMA happens to work as workaround.
Now it's time to withdraw 4cde32fc4b
so as to restore the SB600 SATA 64bit DMA capability.
This patch is also adding the workaround for M2A-VM old BIOS revisions,
but users are suggested to upgrade their system BIOS to the latest one
if they meet this issue.

Signed-off-by: Shane Huang <shane.huang@amd.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Shane Huang
2009-05-27 15:04:43 +08:00
committed by Jeff Garzik
parent 7654db1a92
commit 58a09b38cf
2 changed files with 51 additions and 2 deletions
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1
drivers/firmware/dmi_scan.c
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@ -596,6 +596,7 @@ int dmi_get_year(int field)
return year;
}
EXPORT_SYMBOL(dmi_get_year);
/**
* dmi_walk - Walk the DMI table and get called back for every record