Add the definition of ahci_port_suspend(), which will be used to suspend a
port.
Signed-off-by: Forrest Zhao <forrest.zhao@xxxxxxxxx>
---
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
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