ahci: st: Add ports-implemented property in support

Despite ST AHCI version = 1.3, reading HOST_PORTS_IMPL
returns 0. So force_port_map to 1 by using ports-implemented
DT property.

Signed-off-by: Patrice Chotard <[e-mail]>
Signed-off-by: Tejun Heo <[e-mail]>

drivers/ata/ahci_st.c

···
 
 static int st_ahci_probe(struct platform_device *pdev)
 {
+	struct device *dev = &pdev->dev;
 	struct st_ahci_drv_data *drv_data;
 	struct ahci_host_priv *hpriv;
 	int err;
···
 		return err;
 
 	st_ahci_configure_oob(hpriv->mmio);
+
+	of_property_read_u32(dev->of_node,
+			     "ports-implemented", &hpriv->force_port_map);
 
 	err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info,
 				      &ahci_platform_sht);