This patch adds an function to restart the port dma engine.
This patch also exports the function ahci_qc_issue. The subsequent
patches will make use of them.
Signed-off-by: Loc Ho <lho@xxxxxxx>
Signed-off-by: Suman Tripathi <stripathi@xxxxxxx>
---
drivers/ata/ahci.h | 3 ++-
drivers/ata/libahci.c | 16 ++++++++++++++--
2 files changed, 16 insertions(+), 3 deletions(-)
diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index af63c75..98e8839 100644
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -369,9 +369,10 @@ int ahci_reset_controller(struct ata_host *host);
int ahci_do_softreset(struct ata_link *link, unsigned int *class,
int pmp, unsigned long deadline,
int (*check_ready)(struct ata_link *link));
-
+unsigned int ahci_qc_issue(struct ata_queued_cmd *qc);
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..1b86cf4 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -68,7 +68,6 @@ static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state,
static int ahci_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
-static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc);
static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc);
static int ahci_port_start(struct ata_port *ap);
static void ahci_port_stop(struct ata_port *ap);
@@ -742,6 +741,18 @@ static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
return 0;
}
+int ahci_restart_engine(struct ata_port *ap)
+{
+ struct ahci_host_priv *hpriv = ap->host->private_data;
+
+ ahci_stop_engine(ap);
+ ahci_start_fis_rx(ap);
+ hpriv->start_engine(ap);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ahci_restart_engine);
+
#ifdef CONFIG_PM
static void ahci_power_down(struct ata_port *ap)
{
@@ -1940,7 +1951,7 @@ irqreturn_t ahci_interrupt(int irq, void *dev_instance)
}
EXPORT_SYMBOL_GPL(ahci_interrupt);
-static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc)
+unsigned int ahci_qc_issue(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
void __iomem *port_mmio = ahci_port_base(ap);
@@ -1969,6 +1980,7 @@ static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc)
return 0;
}
+EXPORT_SYMBOL_GPL(ahci_qc_issue);
static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc)
{
--
1.8.2.1
--
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