tree b2ff47054b6424f70a6c10bcffd47f2bdd70e4c8
parent 0fca0d6f2ce3336022a22bc7fc2e009e599e63a4
author Tejun Heo <htejun@gmail.com> 1202861709 +0900
committer Jeff Garzik <jeff@garzik.org> 1203527548 -0500

libata: implement libata.force module parameter

This patch implements libata.force module parameter which can
selectively override ATA port, link and device configurations
including cable type, SATA PHY SPD limit, transfer mode and NCQ.

For example, you can say "use 1.5Gbps for all fan-out ports attached
to the second port but allow 3.0Gbps for the PMP device itself, oh,
the device attached to the third fan-out port chokes on NCQ and
shouldn't go over UDMA4" by the following.

 libata.force=2:1.5g,2.15:3.0g,2.03:noncq,udma4

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>