ata: add ata port hibernate callbacks

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index ba1ed9b..11c9aea 100644 (file)
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5281,12 +5281,24 @@ static int ata_port_request_pm(struct ata_port *ap, pm_message_t mesg,
 
 #define to_ata_port(d) container_of(d, struct ata_port, tdev)
 
-static int ata_port_suspend_common(struct device *dev)
+static int ata_port_suspend_common(struct device *dev, pm_message_t mesg)
 {
        struct ata_port *ap = to_ata_port(dev);
+       unsigned int ehi_flags = ATA_EHI_QUIET;
        int rc;
 
-       rc = ata_port_request_pm(ap, PMSG_SUSPEND, 0, ATA_EHI_QUIET, 1);
+       /*
+        * On some hardware, device fails to respond after spun down
+        * for suspend.  As the device won't be used before being
+        * resumed, we don't need to touch the device.  Ask EH to skip
+        * the usual stuff and proceed directly to suspend.
+        *
+        * http://thread.gmane.org/gmane.linux.ide/46764
+        */
+       if (mesg.event == PM_EVENT_SUSPEND)
+               ehi_flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_NO_RECOVERY;
+
+       rc = ata_port_request_pm(ap, mesg, 0, ehi_flags, 1);
        return rc;
 }
 
@@ -5295,7 +5307,23 @@ static int ata_port_suspend(struct device *dev)
        if (pm_runtime_suspended(dev))
                return 0;
 
-       return ata_port_suspend_common(dev);
+       return ata_port_suspend_common(dev, PMSG_SUSPEND);
+}
+
+static int ata_port_do_freeze(struct device *dev)
+{
+       if (pm_runtime_suspended(dev))
+               pm_runtime_resume(dev);
+
+       return ata_port_suspend_common(dev, PMSG_FREEZE);
+}
+
+static int ata_port_poweroff(struct device *dev)
+{
+       if (pm_runtime_suspended(dev))
+               return 0;
+
+       return ata_port_suspend_common(dev, PMSG_HIBERNATE);
 }
 
 static int ata_port_resume_common(struct device *dev)
@@ -5330,8 +5358,12 @@ static int ata_port_runtime_idle(struct device *dev)
 static const struct dev_pm_ops ata_port_pm_ops = {
        .suspend = ata_port_suspend,
        .resume = ata_port_resume,
+       .freeze = ata_port_do_freeze,
+       .thaw = ata_port_resume,
+       .poweroff = ata_port_poweroff,
+       .restore = ata_port_resume,
 
-       .runtime_suspend = ata_port_suspend_common,
+       .runtime_suspend = ata_port_suspend,
        .runtime_resume = ata_port_resume_common,
        .runtime_idle = ata_port_runtime_idle,
 };