ata_timing_cycle2mode — find xfer mode for the specified cycle duration
ATA_SHIFT_* value for transfer type to examine.
cycle duration in ns
Return matching xfer mode for cycle. The returned mode is of the transfer type specified by xfer_shift. If cycle is too slow for xfer_shift, 0xff is returned. If cycle is faster than the fastest known mode, the fasted mode is returned.
None.
Matching xfer_mode, 0xff if no match found.