ata: add ata port runtime PM callbacks

Add ata port runtime suspend/resume/idle callbacks.
Set ->eh_noresume to skip the runtime PM calls on scsi host
in the error handler to avoid dead lock.
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

drivers/ata/libata-core.c

@@ -66,6 +66,7 @@
 #include <asm/byteorder.h>
 #include <linux/cdrom.h>
 #include <linux/ratelimit.h>
+#include <linux/pm_runtime.h>
 
 #include "libata.h"
 #include "libata-transport.h"
@@ -5307,9 +5308,18 @@ static int ata_port_resume(struct device *dev)
 	return rc;
 }
 
+static int ata_port_runtime_idle(struct device *dev)
+{
+	return pm_runtime_suspend(dev);
+}
+
 static const struct dev_pm_ops ata_port_pm_ops = {
 	.suspend = ata_port_suspend,
 	.resume = ata_port_resume,
+
+	.runtime_suspend = ata_port_suspend_common,
+	.runtime_resume = ata_port_resume,
+	.runtime_idle = ata_port_runtime_idle,
 };
 
 /**

drivers/ata/libata-scsi.c

@@ -3381,6 +3381,7 @@ int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
 		if (!shost)
 			goto err_alloc;
 
+		shost->eh_noresume = 1;
 		*(struct ata_port **)&shost->hostdata[0] = ap;
 		ap->scsi_host = shost;
 

drivers/ata/libata-transport.c

@@ -32,6 +32,7 @@
 #include <linux/libata.h>
 #include <linux/hdreg.h>
 #include <linux/uaccess.h>
+#include <linux/pm_runtime.h>
 
 #include "libata.h"
 #include "libata-transport.h"
@@ -290,6 +291,9 @@ int ata_tport_add(struct device *parent,
 		goto tport_err;
 	}
 
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+
 	transport_add_device(dev);
 	transport_configure_device(dev);