staging/rdma/hfi1: Load SBus firmware once per ASIC

Using fw_sbus_load to control SBus firmware load doesn't scale across multiple
HFI1 cards in a single system. This patch ensures that the SBus firmware is
loaded once per ASIC.
Reviewed-by: NDean Luick <dean.luick@intel.com>
Reviewed-by: NDennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: NEaswar Hariharan <easwar.hariharan@intel.com>
Signed-off-by: NIra Weiny <ira.weiny@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rdma/hfi1/firmware.c

@@ -1236,35 +1236,20 @@ int load_firmware(struct hfi1_devdata *dd)
 {
 	int ret;
 
-	if (fw_sbus_load || fw_fabric_serdes_load) {
+	if (fw_fabric_serdes_load) {
 		ret = acquire_hw_mutex(dd);
 		if (ret)
 			return ret;
 
 		set_sbus_fast_mode(dd);
 
-		/*
-		 * The SBus contains part of the fabric firmware and so must
-		 * also be downloaded.
-		 */
-		if (fw_sbus_load) {
-			turn_off_spicos(dd, SPICO_SBUS);
-			ret = load_sbus_firmware(dd, &fw_sbus);
-			if (ret)
-				goto clear;
-			fw_sbus_load = 0;
-		}
+		set_serdes_broadcast(dd, all_fabric_serdes_broadcast,
+				fabric_serdes_broadcast[dd->hfi1_id],
+				fabric_serdes_addrs[dd->hfi1_id],
+				NUM_FABRIC_SERDES);
+		turn_off_spicos(dd, SPICO_FABRIC);
+		ret = load_fabric_serdes_firmware(dd, &fw_fabric);
 
-		if (fw_fabric_serdes_load) {
-			set_serdes_broadcast(dd, all_fabric_serdes_broadcast,
-					fabric_serdes_broadcast[dd->hfi1_id],
-					fabric_serdes_addrs[dd->hfi1_id],
-					NUM_FABRIC_SERDES);
-			turn_off_spicos(dd, SPICO_FABRIC);
-			ret = load_fabric_serdes_firmware(dd, &fw_fabric);
-		}
-
-clear:
 		clear_sbus_fast_mode(dd);
 		release_hw_mutex(dd);
 		if (ret)
@@ -1583,7 +1568,7 @@ int load_pcie_firmware(struct hfi1_devdata *dd)
 	/* both firmware loads below use the SBus */
 	set_sbus_fast_mode(dd);
 
-	if (fw_sbus_load) {
+	if (fw_sbus_load && (dd->flags & HFI1_DO_INIT_ASIC)) {
 		turn_off_spicos(dd, SPICO_SBUS);
 		ret = load_sbus_firmware(dd, &fw_sbus);
 		if (ret)

drivers/staging/rdma/hfi1/pcie.c

@@ -947,15 +947,16 @@ int do_pcie_gen3_transition(struct hfi1_devdata *dd)
 	}
 
 retry:
+
 	if (therm) {
-		/* toggle SPICO_ENABLE to get back to the state
-		   just after the firmware load */
+		/*
+		 * toggle SPICO_ENABLE to get back to the state
+		 * just after the firmware load
+		 */
 		sbus_request(dd, SBUS_MASTER_BROADCAST, 0x01,
 			WRITE_SBUS_RECEIVER, 0x00000040);
 		sbus_request(dd, SBUS_MASTER_BROADCAST, 0x01,
 			WRITE_SBUS_RECEIVER, 0x00000140);
-		dd_dev_info(dd, "%s: toggle SPICO_ENABLE to reset the bus\n",
-			    __func__);
 	}
 
 	/* step 3: download SBus Master firmware */
@@ -1198,6 +1199,7 @@ int do_pcie_gen3_transition(struct hfi1_devdata *dd)
 
 	/* clear the DC reset */
 	write_csr(dd, CCE_DC_CTRL, 0);
+
 	/* Set the LED off */
 	if (is_a0(dd))
 		setextled(dd, 0);