This patch implements the function ahci_restart_engine function to restart the
port dma engine.
---
drivers/ata/ahci.h | 1 +
drivers/ata/libahci.c | 10 ++++++++++
2 files changed, 11 insertions(+)
diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index af63c75..3c1760e 100644
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -372,6 +372,7 @@ int ahci_do_softreset(struct ata_link *link, unsigned int
*class,
int ahci_stop_engine(struct ata_port *ap);
void ahci_start_engine(struct ata_port *ap);
+int ahci_restart_engine(struct ata_port *ap);
int ahci_check_ready(struct ata_link *link);
int ahci_kick_engine(struct ata_port *ap);
int ahci_port_resume(struct ata_port *ap);
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index b986145..584da77 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -742,6 +742,16 @@ static int ahci_set_lpm(struct ata_link *link, enum
ata_lpm_policy policy,
return 0;
}
+int ahci_restart_engine(struct ata_port *ap)
+{
+ ahci_stop_engine(ap);
+ ahci_start_fis_rx(ap);
+ ahci_start_engine(ap);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ahci_restart_engine);
+
#ifdef CONFIG_PM
static void ahci_power_down(struct ata_port *ap)
{
--
1.8.2.1
--
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