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libata: separate out ata_std_postreset() from ata_sff_postreset()
Separate out generic ATA portion from ata_sff_postreset() into
ata_std_postreset() and implement ata_sff_postreset() using the std
version.
ata_base_port_ops now has ata_std_postreset() for its postreset and
ata_sff_port_ops overrides it to ata_sff_postreset().
This change affects pdc_adma, ahci, sata_fsl and sata_sil24. pdc_adma
now specifies postreset to ata_sff_postreset() explicitly. sata_fsl
and sata_sil24 now use ata_std_postreset() which makes no difference
to them. ahci now calls ata_std_postreset() from its own postreset
method, which causes no behavior difference.
Signed-off-by: Tejun Heo <htejun@gmail.com>