staging/rdma/hfi1: Reset firmware instead of reloading Sbus

Reset firmware instead of reloading Sbus firmware if it's already done for this
ASIC.  To work around thermal polling problem in firmware, don't reload Sbus
firmware, instead, reset the firmware on the initialization of the second HFI.
Reviewed-by: NEaswar Hariharan <easwar.hariharan@intel.com>
Reviewed-by: NDennis Dalessandro <dennis.dalessandro@intel.com>
Reviewed-by: NDean Luick <dean.luick@intel.com>
Signed-off-by: NCaz Yokoyama <caz.yokoyama@intel.com>
Signed-off-by: NIra Weiny <ira.weiny@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rdma/hfi1/chip.h

@@ -609,6 +609,7 @@ static inline void write_uctxt_csr(struct hfi1_devdata *dd, int ctxt,
 u64 create_pbc(struct hfi1_pportdata *ppd, u64, int, u32, u32);
 
 /* firmware.c */
+#define SBUS_MASTER_BROADCAST 0xfd
 #define NUM_PCIE_SERDES 16	/* number of PCIe serdes on the SBus */
 extern const u8 pcie_serdes_broadcast[];
 extern const u8 pcie_pcs_addrs[2][NUM_PCIE_SERDES];

drivers/staging/rdma/hfi1/firmware.c

@@ -924,9 +924,6 @@ static int load_8051_firmware(struct hfi1_devdata *dd,
 	return 0;
 }
 
-/* SBus Master broadcast address */
-#define SBUS_MASTER_BROADCAST 0xfd
-
 /*
  * Write the SBus request register
  *
@@ -1255,6 +1252,7 @@ int load_firmware(struct hfi1_devdata *dd)
 			ret = load_sbus_firmware(dd, &fw_sbus);
 			if (ret)
 				goto clear;
+			fw_sbus_load = 0;
 		}
 
 		if (fw_fabric_serdes_load) {

drivers/staging/rdma/hfi1/pcie.c

@@ -946,9 +946,20 @@ int do_pcie_gen3_transition(struct hfi1_devdata *dd)
 			    __func__);
 	}
 
+retry:
+	if (therm) {
+		/* 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 */
 	/* step 4: download PCIe Gen3 SerDes firmware */
-retry:
 	dd_dev_info(dd, "%s: downloading firmware\n", __func__);
 	ret = load_pcie_firmware(dd);
 	if (ret)