[libata] AHCI: enable AHCI mode, before using AHCI reset

AHCI spec says host-reset bit may only be set when the ahci-enable bit
is also set.

Noticed by Peer Chen <peerchen@gmail.com>

Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Jeff Garzik 2007-09-26 00:02:41 -04:00
commit 3cc3eb1148