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5287 used to be treated as vt6420 but it didn't work. It's new family of controllers called vt8251 which hosts four SATA ports as M/S of the two ATA ports. This configuration is rather peculiar in that although the M/S devices are on the same port, each have its own SCR (or equivalent link status/control) registers which screws up the port-link-device hierarchy assumed by libata. Another controller which falls into this category is ata_piix w/ SIDPR access. libata now has facility to deal with this class of controllers named slave_link. A low level driver for such controllers can just call ata_slave_link_init() on the respective ports and libata will handle all the difficult parts like following up with single SRST after hardresetting both ports. This patch creates new controller class vt8251, implements slave_link aware init sequence and config space based SCR access for it and moves 5287 to the new class. This patch is based on Joseph Chan's larger patch which was created before slave_link was implemented in libata. http://thread.gmane.org/gmane.linux.kernel.commits.mm/40640 Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Joseph Chan <JosephChan@via.com.tw> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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Tejun Heo
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Jeff Garzik
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Oct 31, 2008
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