ARM: meson: serial: use meson_uart_tx_empty() to wait for empty

Use the meson_uart_tx_empty() instead of a direct read of the status
register. This is easier to read and will ensure the UART's transmit
state machine is idle when trying to update the baud rate.

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Tested-by: Carlo Caione <carlo@endlessm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c
index 9327efd..d3f2c96 100644 (file)
--- a/drivers/tty/serial/meson_uart.c
+++ b/drivers/tty/serial/meson_uart.c
@@ -285,7 +285,7 @@ static void meson_uart_change_speed(struct uart_port *port, unsigned long baud)
 {
        u32 val;
 
-       while (!(readl(port->membase + AML_UART_STATUS) & AML_UART_TX_EMPTY))
+       while (!meson_uart_tx_empty(port))
                cpu_relax();
 
        val = readl(port->membase + AML_UART_REG5);