tree fd9d0f14c5a5e329f4c1d2ee737177c5caf24b02
parent 6d32d30f55020d766388df7515f771f68c973033
author Alan Cox <alan@lxorguk.ukuu.org.uk> 1187246016 -0400
committer Jeff Garzik <jeff@garzik.org> 1192215334 -0400

[libata] add ACPI cable detect API

Combined from two Alan Cox patches:

1) libata: ACPI checks for 80wire cable

We can use the ACPI mode information with several drivers as a hint to
cable type. If the ACPI mode set by the BIOS is faster than UDMA33 then
we know the BIOS thinks there are 80wire cables. If it doesn't set such a
mode or it has no ACPI method then we get no further information and can
rely on existing approaches

Introduce the function headers needed. Null it out for non ACPI boxes

Signed-off-by: Alan Cox <alan@redhat.com>

2) libata: ACPI checks for 80wire cable

Provide actual methods for checking if the ACPI support thinks the cable
is 80wire, or doesn't know

Signed-off-by: Alan Cox <alan@redhat.com>

Combined into a single changeset and
Signed-off-by: Jeff Garzik <jeff@garzik.org>