sata_link_scr_lpm (9) Linux Manual Page
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.