+static int sas_ex_phy_discover_helper(struct domain_device *dev, u8 *disc_req,
+ u8 *disc_resp, int single)
+{
+ int i, res;
+
+ disc_req[9] = single;
+ for (i = 1 ; i < 3; i++) {
+ struct discover_resp *dr;
+
+ res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
+ disc_resp, DISCOVER_RESP_SIZE);
+ if (res)
+ return res;
+ /* This is detecting a failure to transmit inital
+ * dev to host FIS as described in section G.5 of
+ * sas-2 r 04b */
+ dr = &((struct smp_resp *)disc_resp)->disc;
+ if (!(dr->attached_dev_type == 0 &&
+ dr->attached_sata_dev))
+ break;
+ /* In order to generate the dev to host FIS, we
+ * send a link reset to the expander port */
+ sas_smp_phy_control(dev, single, PHY_FUNC_LINK_RESET, NULL);
+ /* Wait for the reset to trigger the negotiation */
+ msleep(500);
+ }
+ sas_set_ex_phy(dev, single, disc_resp);
+ return 0;
+}
+