SATA_LINK_SCR_LPM(9) libata Library SATA_LINK_SCR_LPM(9)
NAME
sata_link_scr_lpm - manipulate SControl IPM and SPM fields
SYNOPSIS
int sata_link_scr_lpm(struct ata_link * link, enum ata_lpm_policy policy, bool spm_wakeup);
ARGUMENTS
link
ATA link to manipulate SControl for
policy
LPM policy to configure
spm_wakeup
initiate LPM transition to active state
DESCRIPTION
Manipulate the IPM field of the SControl register of link according to policy. If policy is ATA_LPM_MAX_POWER and spm_wakeup is true, the
SPM field is manipulated to wake up the link. This function also clears PHYRDY_CHG before returning.
LOCKING
EH context.
RETURNS
0 on succes, -errno otherwise.
AUTHOR
Jeff Garzik
Author.
COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 SATA_LINK_SCR_LPM(9)
