suse man page for sata_down_spd_limit

SATA_DOWN_SPD_LIMIT(9)					       libata Core Internals					    SATA_DOWN_SPD_LIMIT(9)

NAME
       sata_down_spd_limit - adjust SATA spd limit downward

SYNOPSIS
       int sata_down_spd_limit(struct ata_link * link, u32 spd_limit);

ARGUMENTS
       link
	   Link to adjust SATA spd limit for

       spd_limit
	   Additional limit

DESCRIPTION
       Adjust SATA spd limit of link downward. Note that this function only adjusts the limit. The change must be applied using sata_set_spd.

       If spd_limit is non-zero, the speed is limited to equal to or lower than spd_limit if such speed is supported. If spd_limit is slower than
       any supported speed, only the lowest supported speed is allowed.

LOCKING
       Inherited from caller.

RETURNS
       0 on success, negative errno on failure

AUTHOR
       Jeff Garzik
	   Author.

COPYRIGHT
Kernel Hackers Manual 2.6.					     July 2010						    SATA_DOWN_SPD_LIMIT(9)