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libata: Power off empty ports

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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: Kristen Carlson Accardi <kristen@linux.intel.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Kristen Carlson Accardi
2011-03-04 10:24:11 -08:00
committed by Jeff Garzik
parent 0afc6f5ba9
commit 8a745f1f39
3 changed files with 10 additions and 3 deletions
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10
drivers/ata/libata-core.c
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@@ -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:
/* no restrictions on LPM transitions */
scontrol &= ~(0x3 << 8);
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);