staging/rdma/hfi1: Fix port bounce issues with 0.22 DC firmware

The DC firmware overwrites the enable_lane_tx register and does not update it
on a host request to go to Poll. This causes an infinite loop through the LNI
state machine if a link width downgrade occurs. This patch re-sets the
enable_lane_tx register to all 4 lanes.
Reviewed-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Easwar Hariharan <easwar.hariharan@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rdma/hfi1/chip.c

@@ -5415,6 +5415,8 @@ static int set_local_link_attributes(struct hfi1_pportdata *ppd)
 		if (ppd->link_speed_enabled & OPA_LINK_SPEED_12_5G)
 			ppd->local_tx_rate |= 1;
 	}
+
+	enable_lane_tx = 0xF; /* enable all four lanes */
 	ret = write_tx_settings(dd, enable_lane_tx, tx_polarity_inversion,
 		     rx_polarity_inversion, ppd->local_tx_rate);
 	if (ret != HCMD_SUCCESS)