Input: atmel_mxt_ts: add a second try if initialization fails

For an unknown reason, the maxtouch can not ack the i2c request when we
want to communicate. Trying to establish the communication finally works
after about 200 ms. So when probing the driver if the first time
initilization fails then wait and try a second time.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
[nicolas.ferre@microchip.com: change lost while moving to github driver
re-integrate it here]
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>

drivers/input/touchscreen/atmel_mxt_ts.c

@@ -3727,8 +3727,14 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	}
 
 	error = mxt_initialize(data);
-	if (error)
-		goto err_free_irq;
+	if (error) {
+		/* Wait and try a second time */
+		msleep(MXT_RESET_TIME);
+		dev_warn(&client->dev, "Try a second time to init maxtouch\n");
+		error = mxt_initialize(data);
+		if (error)
+			goto err_free_irq;
+	}
 
 	return 0;