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.

RETURN
       0 on success, -errno otherwise.

AUTHOR
       Jeff Garzik
           Author.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                      SATA_LINK_SCR_LPM(9)