tty/serial: atmel: remove unneeded atmel_get_lines_status function

Since commit 18dfef9c ("serial: atmel: convert to irq handling
provided mctrl-gpio"), the GPIOs interrupts are handled by
mctrl_gpio_irq_handle().
So, atmel_get_lines_status() can be completely killed and replaced by :
atmel_uart_readl(port, ATMEL_US_CSR);
Suggested-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Link: https://lore.kernel.org/r/20190826071752.30396-1-richard.genoud@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/atmel_serial.c

@@ -294,50 +294,6 @@ static void atmel_tasklet_schedule(struct atmel_uart_port *atmel_port,
 		tasklet_schedule(t);
 }
 
-static unsigned int atmel_get_lines_status(struct uart_port *port)
-{
-	struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
-	unsigned int status, ret = 0;
-
-	status = atmel_uart_readl(port, ATMEL_US_CSR);
-
-	mctrl_gpio_get(atmel_port->gpios, &ret);
-
-	if (!IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(atmel_port->gpios,
-						UART_GPIO_CTS))) {
-		if (ret & TIOCM_CTS)
-			status &= ~ATMEL_US_CTS;
-		else
-			status |= ATMEL_US_CTS;
-	}
-
-	if (!IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(atmel_port->gpios,
-						UART_GPIO_DSR))) {
-		if (ret & TIOCM_DSR)
-			status &= ~ATMEL_US_DSR;
-		else
-			status |= ATMEL_US_DSR;
-	}
-
-	if (!IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(atmel_port->gpios,
-						UART_GPIO_RI))) {
-		if (ret & TIOCM_RI)
-			status &= ~ATMEL_US_RI;
-		else
-			status |= ATMEL_US_RI;
-	}
-
-	if (!IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(atmel_port->gpios,
-						UART_GPIO_DCD))) {
-		if (ret & TIOCM_CD)
-			status &= ~ATMEL_US_DCD;
-		else
-			status |= ATMEL_US_DCD;
-	}
-
-	return status;
-}
-
 /* Enable or disable the rs485 support */
 static int atmel_config_rs485(struct uart_port *port,
 			      struct serial_rs485 *rs485conf)
@@ -1453,7 +1409,7 @@ static irqreturn_t atmel_interrupt(int irq, void *dev_id)
 	spin_lock(&atmel_port->lock_suspended);
 
 	do {
-		status = atmel_get_lines_status(port);
+		status = atmel_uart_readl(port, ATMEL_US_CSR);
 		mask = atmel_uart_readl(port, ATMEL_US_IMR);
 		pending = status & mask;
 		if (!pending)
@@ -2002,7 +1958,7 @@ static int atmel_startup(struct uart_port *port)
 	}
 
 	/* Save current CSR for comparison in atmel_tasklet_func() */
-	atmel_port->irq_status_prev = atmel_get_lines_status(port);
+	atmel_port->irq_status_prev = atmel_uart_readl(port, ATMEL_US_CSR);
 
 	/*
 	 * Finally, enable the serial port