Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 8a745f1f authored by Kristen Carlson Accardi's avatar Kristen Carlson Accardi Committed by Jeff Garzik
Browse files

libata: Power off empty ports 



Give users the option of completely powering off unoccupied
SATA ports using the existing min_power link_power_management_policy
option.  When the use selects this option on an empty port, we
will power the port off by setting DET to off.  For occupied ports,
behavior is unchanged.

Signed-off-by: default avatarKristen Carlson Accardi <kristen@linux.intel.com>
Signed-off-by: default avatarJeff Garzik <jgarzik@pobox.com>
parent 0afc6f5b

drivers/ata/libata-core.c

+8 −2
Original line number Diff line number Diff line
@@ -3619,8 +3619,14 @@ int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy, 
		scontrol |= (0x2 << 8);

		break;

	case ATA_LPM_MIN_POWER:

		if (ata_link_nr_enabled(link) > 0)

			/* no restrictions on LPM transitions */

			scontrol &= ~(0x3 << 8);

		else {

			/* empty port, power off */

			scontrol &= ~0xf;

			scontrol |= (0x1 << 2);

		}

		break;

	default:

		WARN_ON(1);

drivers/ata/libata-eh.c

+1 −1
Original line number Diff line number Diff line
@@ -3423,7 +3423,7 @@ fail: 
	return rc;

}



static int ata_link_nr_enabled(struct ata_link *link)

int ata_link_nr_enabled(struct ata_link *link)

{

	struct ata_device *dev;

	int cnt = 0;

include/linux/libata.h

+1 −0
Original line number Diff line number Diff line
@@ -1151,6 +1151,7 @@ extern void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset, 
		      ata_reset_fn_t softreset, ata_reset_fn_t hardreset,

		      ata_postreset_fn_t postreset);

extern void ata_std_error_handler(struct ata_port *ap);

extern int ata_link_nr_enabled(struct ata_link *link);



/*

 * Base operations to inherit from and initializers for sht