[PATCH 4/6] The definition of ahci_port_suspend()

["zhao, forrest" <forrest.zhao@intel.com>]

Add the definition of ahci_port_suspend(), which will be used to suspend a
port.


Signed-off-by: Forrest Zhao <forrest.zhao@intel.com>

---

 drivers/scsi/ahci.c |   35 ++++++++++++++++++++++++++++++++++-
 1 files changed, 34 insertions(+), 1 deletions(-)

753c1cc8b4138938187e773a05255478a737bbe9
diff --git a/drivers/scsi/ahci.c b/drivers/scsi/ahci.c
index 12eed7e..1d9c158 100644
--- a/drivers/scsi/ahci.c
+++ b/drivers/scsi/ahci.c
@@ -216,6 +216,7 @@ static int ahci_port_start(struct ata_po
 static void ahci_port_stop(struct ata_port *ap);
 static int ahci_port_standby(void __iomem *port_mmio, u32 cap);
 static int ahci_port_spinup(void __iomem *port_mmio, u32 cap);
+static int ahci_port_suspend(struct ata_port *ap, pm_message_t state);
 static void ahci_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
 static void ahci_qc_prep(struct ata_queued_cmd *qc);
 static u8 ahci_check_status(struct ata_port *ap);
@@ -434,7 +435,6 @@ static int ahci_port_start(struct ata_po
 	return 0;
 }
 
-
 static void ahci_port_stop(struct ata_port *ap)
 {
 	struct device *dev = ap->host_set->dev;
@@ -460,6 +460,39 @@ static void ahci_port_stop(struct ata_po
 	kfree(pp);
 }
 
+static int ahci_port_suspend(struct ata_port *ap, pm_message_t state)
+{
+	void __iomem *mmio = ap->host_set->mmio_base;
+	void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
+	struct ahci_host_priv *hpriv = ap->host_set->private_data;
+	int rc;
+
+	/*
+	 * Disable DMA
+	 */
+	rc = ahci_stop_engine(port_mmio);
+	if (rc) {
+		ata_port_printk(ap, KERN_WARNING, "DMA engine busy\n");
+		return rc;
+	}
+
+	/*
+	 * Disable FIS reception
+	 */
+	rc = ahci_stop_fis_rx(port_mmio);
+	if (rc)
+		ata_port_printk(ap, KERN_WARNING, "FIS RX still running"
+				" (%d)\n", rc);
+
+	/*
+	 * Put device into slumber mode
+	 */
+	if (!rc && state.event != PM_EVENT_FREEZE)
+		ahci_port_standby(port_mmio, hpriv->cap);
+
+	return rc;
+}
+
 static u32 ahci_scr_read (struct ata_port *ap, unsigned int sc_reg_in)
 {
 	unsigned int sc_reg;
-- 
1.2.6