driver:ucb1400: Re-enable pen-down detection via bias mode

drivers/input/touchscreen/ucb1400_ts.c

@@ -205,7 +205,7 @@ static void ucb1400_clear_pending_irq(struct ucb1400_ts *ucb)
 
 static void ucb1400_poll_touch(struct ucb1400_ts *ucb, struct touch_data *data)
 {
-	bool penup, discard, retry, is_pendown = false;
+	bool penup, discard, retry, is_pendown = false, should_sleep = false;
 	int ret;
 
 	int hys_down = SECO_INF_DOWN_HYSTERESIS;
@@ -219,6 +219,14 @@ static void ucb1400_poll_touch(struct ucb1400_ts *ucb, struct touch_data *data)
 		discard = false;
 		retry = false;
 
+		ucb1400_ts_mode_int(ucb);
+
+		if (should_sleep) {
+			should_sleep = false;
+			wait_event_timeout(ucb->ts_wait, ucb->stopped,
+					   msecs_to_jiffies(UCB1400_TS_POLL_PERIOD));
+		}
+
 		penup = ucb1400_ts_pen_up(ucb);
 
 		if (!penup) {
@@ -258,8 +266,7 @@ static void ucb1400_poll_touch(struct ucb1400_ts *ucb, struct touch_data *data)
 				continue;
 
 			/* Skip further processing during debounce period */
-			wait_event_timeout(ucb->ts_wait, ucb->stopped,
-					   msecs_to_jiffies(UCB1400_TS_POLL_PERIOD));
+			should_sleep = true;
 			continue;
 		}
 
@@ -273,15 +280,13 @@ static void ucb1400_poll_touch(struct ucb1400_ts *ucb, struct touch_data *data)
 
 		if (hys_down) {
 			hys_down--;
-			wait_event_timeout(ucb->ts_wait, ucb->stopped,
-					   msecs_to_jiffies(UCB1400_TS_POLL_PERIOD));
+			should_sleep = true;
 			continue;
 		}
 
 		ucb1400_ts_report_event(ucb->ts_idev, data);
 
-		wait_event_timeout(ucb->ts_wait, ucb->stopped,
-				   msecs_to_jiffies(UCB1400_TS_POLL_PERIOD));
+		should_sleep = true;
 	}
 
 	/*