ata_timing_cycle2mode(9) centos man page | unix.com

ATA_TIMING_CYCLE2MOD(9) 					  libata Library					   ATA_TIMING_CYCLE2MOD(9)

NAME
       ata_timing_cycle2mode - find xfer mode for the specified cycle duration

SYNOPSIS
       u8 ata_timing_cycle2mode(unsigned int xfer_shift, int cycle);

ARGUMENTS
       xfer_shift
	   ATA_SHIFT_* value for transfer type to examine.

       cycle
	   cycle duration in ns

DESCRIPTION
       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.

LOCKING
       None.

RETURNS
       Matching xfer_mode, 0xff if no match found.

AUTHOR
       Jeff Garzik
	   Author.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   ATA_TIMING_CYCLE2MOD(9)