libata: implement LPM support for port multipliers
Port multipliers can do DIPM on fan-out links fine. Implement support
for it. Tested w/ SIMG 57xx and marvell PMPs. Both the host and
fan-out links enter power save modes nicely.
SIMG 37xx and 47xx report link offline on SStatus causing EH to detach
the devices. Blacklisted.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index a645cd3..06a4db1 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -3232,7 +3232,7 @@
static int ata_eh_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
struct ata_device **r_failed_dev)
{
- struct ata_port *ap = link->ap;
+ struct ata_port *ap = ata_is_host_link(link) ? link->ap : NULL;
struct ata_eh_context *ehc = &link->eh_context;
struct ata_device *dev, *link_dev = NULL, *lpm_dev = NULL;
unsigned int hints = ATA_LPM_EMPTY | ATA_LPM_HIPM;
@@ -3278,9 +3278,12 @@
}
}
- rc = ap->ops->set_lpm(link, policy, hints);
- if (!rc && ap->slave_link)
- rc = ap->ops->set_lpm(ap->slave_link, policy, hints);
+ if (ap) {
+ rc = ap->ops->set_lpm(link, policy, hints);
+ if (!rc && ap->slave_link)
+ rc = ap->ops->set_lpm(ap->slave_link, policy, hints);
+ } else
+ rc = sata_pmp_set_lpm(link, policy, hints);
/*
* Attribute link config failure to the first (LPM) enabled
@@ -3412,8 +3415,14 @@
ehc->saved_ncq_enabled &= ~(1 << dev->devno);
/* the link maybe in a deep sleep, wake it up */
- if (link->lpm_policy > ATA_LPM_MAX_POWER)
- link->ap->ops->set_lpm(link, ATA_LPM_MAX_POWER, ATA_LPM_EMPTY);
+ if (link->lpm_policy > ATA_LPM_MAX_POWER) {
+ if (ata_is_host_link(link))
+ link->ap->ops->set_lpm(link, ATA_LPM_MAX_POWER,
+ ATA_LPM_EMPTY);
+ else
+ sata_pmp_set_lpm(link, ATA_LPM_MAX_POWER,
+ ATA_LPM_EMPTY);
+ }
/* Record and count probe trials on the ering. The specific
* error mask used is irrelevant. Because a successful device