diff --recursive -u ./clean/linux-4.9.80/drivers/ata/libahci.c linux-4.9.80/drivers/ata/libahci.c
--- ./clean/linux-4.9.80/drivers/ata/libahci.c	2018-02-03 11:05:43.000000000 -0500
+++ linux-4.9.80/drivers/ata/libahci.c	2018-02-07 18:02:32.526535910 -0500
@@ -537,8 +537,12 @@
 	}
 
 	/* fabricate port_map from cap.nr_ports for < AHCI 1.3 */
-	if (!port_map && vers < 0x10300) {
-		port_map = (1 << ahci_nr_ports(cap)) - 1;
+	if (!port_map) { //  && vers < 0x10300) {
+		printk("%s: saved_port=%02x\n", __func__, hpriv->saved_port_map);
+		writel(0x1, mmio + HOST_PORTS_IMPL);
+		port_map = readl(mmio + HOST_PORTS_IMPL);
+
+		//port_map = (1 << ahci_nr_ports(cap)) - 1;
 		dev_warn(dev, "forcing PORTS_IMPL to 0x%lx\n", port_map);
 
 		/* write the fixed up value to the PI register */