Man page 9 : sata_down_spd_limit

sata_down_spd_limit - adjust SATA spd limit downward

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

link
    Link to adjust SATA spd limit for

spd_limit
    Additional limit

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.

Inherited from caller.

0 on success, negative errno on failure

Jeff Garzik
    Author.