ata_piix: implement LPM support

Now that DIPM can be used independently from HIPM, ata_piix can
support LPM too.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

drivers/ata/ata_piix.c

@@ -175,6 +175,8 @@ static int piix_sidpr_scr_read(struct ata_link *link,
 			       unsigned int reg, u32 *val);
 static int piix_sidpr_scr_write(struct ata_link *link,
 				unsigned int reg, u32 val);
+static int piix_sidpr_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
+			      unsigned hints);
 static bool piix_irq_check(struct ata_port *ap);
 #ifdef CONFIG_PM
 static int piix_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
@@ -348,11 +350,22 @@ static struct ata_port_operations ich_pata_ops = {
 	.set_dmamode		= ich_set_dmamode,
 };
 
+static struct device_attribute *piix_sidpr_shost_attrs[] = {
+	&dev_attr_link_power_management_policy,
+	NULL
+};
+
+static struct scsi_host_template piix_sidpr_sht = {
+	ATA_BMDMA_SHT(DRV_NAME),
+	.shost_attrs		= piix_sidpr_shost_attrs,
+};
+
 static struct ata_port_operations piix_sidpr_sata_ops = {
 	.inherits		= &piix_sata_ops,
 	.hardreset		= sata_std_hardreset,
 	.scr_read		= piix_sidpr_scr_read,
 	.scr_write		= piix_sidpr_scr_write,
+	.set_lpm		= piix_sidpr_set_lpm,
 };
 
 static const struct piix_map_db ich5_map_db = {
@@ -984,6 +997,12 @@ static int piix_sidpr_scr_write(struct ata_link *link,
 	return 0;
 }
 
+static int piix_sidpr_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
+			      unsigned hints)
+{
+	return sata_link_scr_lpm(link, policy, false);
+}
+
 static bool piix_irq_check(struct ata_port *ap)
 {
 	if (unlikely(!ap->ioaddr.bmdma_addr))
@@ -1543,6 +1562,7 @@ static int __devinit piix_init_one(struct pci_dev *pdev,
 	struct device *dev = &pdev->dev;
 	struct ata_port_info port_info[2];
 	const struct ata_port_info *ppi[] = { &port_info[0], &port_info[1] };
+	struct scsi_host_template *sht = &piix_sht;
 	unsigned long port_flags;
 	struct ata_host *host;
 	struct piix_host_priv *hpriv;
@@ -1612,6 +1632,8 @@ static int __devinit piix_init_one(struct pci_dev *pdev,
 		rc = piix_init_sidpr(host);
 		if (rc)
 			return rc;
+		if (host->ports[0]->ops == &piix_sidpr_sata_ops)
+			sht = &piix_sidpr_sht;
 	}
 
 	/* apply IOCFG bit18 quirk */
@@ -1638,7 +1660,7 @@ static int __devinit piix_init_one(struct pci_dev *pdev,
 	host->flags |= ATA_HOST_PARALLEL_SCAN;
 
 	pci_set_master(pdev);
-	return ata_pci_sff_activate_host(host, ata_bmdma_interrupt, &piix_sht);
+	return ata_pci_sff_activate_host(host, ata_bmdma_interrupt, sht);
 }
 
 static void piix_remove_one(struct pci_dev *pdev)