thunderbolt: Add missing usb4_port_sb_read() to usb4_port_sw_margin()

Synchronize the operation completion by reading back the software
margining operation completion metadata into margining->results.

Signed-off-by: Aapo Vienamo <aapo.vienamo@linux.intel.com>
Co-developed-by: R Kannappan <r.kannappan@intel.com>
Signed-off-by: R Kannappan <r.kannappan@intel.com>
Co-developed-by: Rene Sapiens <rene.sapiens@intel.com>
Signed-off-by: Rene Sapiens <rene.sapiens@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Author: Aapo Vienamo

drivers/thunderbolt/debugfs.c

@@ -785,9 +785,8 @@ static int margining_run_write(void *data, u64 val)
 			    margining->time ? "time" : "voltage", dev_name(dev),
 			    margining->lanes);
 		ret = usb4_port_sw_margin(port, margining->target, margining->index,
-					  margining->lanes, margining->time,
-					  margining->right_high,
-					  USB4_MARGIN_SW_COUNTER_CLEAR);
+					  margining->lanes, margining->time, margining->right_high,
+					  USB4_MARGIN_SW_COUNTER_CLEAR, &margining->results[0]);
 		if (ret)
 			goto out_clx;
 

drivers/thunderbolt/tb.h

@@ -1360,7 +1360,7 @@ int usb4_port_hw_margin(struct tb_port *port, enum usb4_sb_target target,
 			bool timing, bool right_high, u32 *results);
 int usb4_port_sw_margin(struct tb_port *port, enum usb4_sb_target target,
 			u8 index, unsigned int lanes, bool timing,
-			bool right_high, u32 counter);
+			bool right_high, u32 counter, u32 *results);
 int usb4_port_sw_margin_errors(struct tb_port *port, enum usb4_sb_target target,
 			       u8 index, u32 *errors);
 

drivers/thunderbolt/usb4.c

@@ -1703,14 +1703,15 @@ int usb4_port_hw_margin(struct tb_port *port, enum usb4_sb_target target,
  * @timing: Perform timing margining instead of voltage
  * @right_high: Use Right/high margin instead of left/low
  * @counter: What to do with the error counter
+ * @results: Data word for the operation completion data
  *
  * Runs software lane margining on USB4 port. Read back the error
  * counters by calling usb4_port_sw_margin_errors(). Returns %0 in
  * success and negative errno otherwise.
  */
 int usb4_port_sw_margin(struct tb_port *port, enum usb4_sb_target target,
 			u8 index, unsigned int lanes, bool timing,
-			bool right_high, u32 counter)
+			bool right_high, u32 counter, u32 *results)
 {
 	u32 val;
 	int ret;
@@ -1728,8 +1729,14 @@ int usb4_port_sw_margin(struct tb_port *port, enum usb4_sb_target target,
 	if (ret)
 		return ret;
 
-	return usb4_port_sb_op(port, target, index,
-			       USB4_SB_OPCODE_RUN_SW_LANE_MARGINING, 2500);
+	ret = usb4_port_sb_op(port, target, index,
+			      USB4_SB_OPCODE_RUN_SW_LANE_MARGINING, 2500);
+	if (ret)
+		return ret;
+
+	return usb4_port_sb_read(port, target, index, USB4_SB_DATA, results,
+				 sizeof(*results));
+
 }
 
 /**