libahci: Allow drivers to override start_engine
Allwinner A10 and A20 ARM SoCs have an AHCI sata controller which needs a
special register to be poked before starting the DMA engine.
This register gets reset on an ahci_stop_engine call, so there is no other
place then ahci_start_engine where this poking can be done.
This commit allows drivers to override ahci_start_engine behavior for use by
the Allwinner AHCI driver (and potentially other drivers in the future).
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index b6a49ce..1d4efe5 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -563,6 +563,7 @@
unsigned long deadline)
{
struct ata_port *ap = link->ap;
+ struct ahci_host_priv *hpriv = ap->host->private_data;
bool online;
int rc;
@@ -573,7 +574,7 @@
rc = sata_link_hardreset(link, sata_ehc_deb_timing(&link->eh_context),
deadline, &online, NULL);
- ahci_start_engine(ap);
+ hpriv->start_engine(ap);
DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
@@ -588,6 +589,7 @@
{
struct ata_port *ap = link->ap;
struct ahci_port_priv *pp = ap->private_data;
+ struct ahci_host_priv *hpriv = ap->host->private_data;
u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
struct ata_taskfile tf;
bool online;
@@ -603,7 +605,7 @@
rc = sata_link_hardreset(link, sata_ehc_deb_timing(&link->eh_context),
deadline, &online, NULL);
- ahci_start_engine(ap);
+ hpriv->start_engine(ap);
/* The pseudo configuration device on SIMG4726 attached to
* ASUS P5W-DH Deluxe doesn't send signature FIS after