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>
[eugen.hristev@microchip.com: adapted original patch to 4.14>
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>

Author: ldesroches

drivers/input/touchscreen/atmel_mxt_ts.c

@@ -3210,8 +3210,14 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	disable_irq(client->irq);
 
 	error = mxt_initialize(data);
-	if (error)
-		return error;
+	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)
+			return error;
+	}
 
 	error = sysfs_create_group(&client->dev.kobj, &mxt_attr_group);
 	if (error) {