Implement ahci_[de]init_port() and use it during initialization and
de-initialization. ahci_[de]init_port() are supersets of what used to
be done during driver [de-]initialization. This patch makes the
following behavior changes.
* Per-port IRQ mask is cleared on driver load as done in other
drivers. The mask will be configured properly during probe.
* During init_one(), HOST_IRQ_STAT is cleared after masking port IRQs
such that there is no race window.
* CMD_SPIN_UP is cleared during init_one() instead of being set. It
is set in port_start(). This is more consistent with overall
structure of initialization. Note that CMD_SPIN_UP simply controls
PHY activation.
* Slumber and staggered spin-up are handled properly.
* All init/deinit operations are done in step-by-step manner as
described in the spec instead of issued as single merged command.
Original implementation is from Zhao, Forrest <forrest.zhao@intel.com>
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Zhao, Forrest <forrest.zhao@intel.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
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