ata_piix: unify code for programming PIO and MWDMA timings
Besides making things noticably simpler it results in ~2% decrease in the driver LOC count and also ~2% decrease in the driver binary size (as measured on x86-32). Fix piix_set_piomode() documentation while at it. Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com> Signed-off-by: NJeff Garzik <jgarzik@redhat.com>
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