tree d87c26e26d52725ee7f54d1cf81e81c0a4adc53f
parent 31f88384443b3e0d7e2c9d36a96647b7e82edad3
author Tejun Heo <htejun@gmail.com> 1190521194 +0900
committer Jeff Garzik <jeff@garzik.org> 1192215344 -0400

sata_sil24: implement PMP support

Implement PMP support.  sil24 supports full FIS-switching.  However,
it has a PMP DMA CS errata which requires port-wide resetting if
commands are outstanding to three or more devices when an error occurs
on one of them.

ATAPI commands often result in CHECK SENSE and it's crucial to not
reset them before fetching sense data.  Unfortunately, ATAPI CHECK
SENSE causes a lot of problem if command is outstanding to any other
device usually resulting in port-wide reset.  So, sata_sil24
implements sil24_qc_defer() which guarantees ATAPI command is run by
itself.

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