'\" t
.\"     Title: sata_link_scr_lpm
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: June 2017
.\"    Manual: libata Library
.\"    Source: Kernel Hackers Manual 4.9.30
.\"  Language: English
.\"
.TH "SATA_LINK_SCR_LPM" "9" "June 2017" "Kernel Hackers Manual 4\&.9\&." "libata Library"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
sata_link_scr_lpm \- manipulate SControl IPM and SPM fields
.SH "SYNOPSIS"
.HP \w'int\ sata_link_scr_lpm('u
.BI "int sata_link_scr_lpm(struct\ ata_link\ *\ " "link" ", enum\ ata_lpm_policy\ " "policy" ", bool\ " "spm_wakeup" ");"
.SH "ARGUMENTS"
.PP
\fIlink\fR
.RS 4
ATA link to manipulate SControl for
.RE
.PP
\fIpolicy\fR
.RS 4
LPM policy to configure
.RE
.PP
\fIspm_wakeup\fR
.RS 4
initiate LPM transition to active state
.RE
.SH "DESCRIPTION"
.PP
Manipulate the IPM field of the SControl register of
\fIlink\fR
according to
\fIpolicy\fR\&. If
\fIpolicy\fR
is ATA_LPM_MAX_POWER and
\fIspm_wakeup\fR
is
\fBtrue\fR, the SPM field is manipulated to wake up the link\&. This function also clears PHYRDY_CHG before returning\&.
.PP
LOCKING: EH context\&.
.SH "RETURN"
.PP
0 on success, \-errno otherwise\&.
.SH "AUTHOR"
.PP
\fBJeff Garzik\fR
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br