[PATCH] ns16550: Respect CONFIG_BAUDRATE < 0 in _debug_uart_init

[Joakim Tjernlund]

CONFIG_BAUDRATE less than 0 means do not touch baudrate settings.

Signed-off-by: Joakim Tjernlund <joakim.tjernl...@infinera.com>
---
 drivers/serial/ns16550.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index 702109b23b..286d8aecca 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -333,15 +333,19 @@ static inline void _debug_uart_init(void)
         * feasible. The better fix is to move all users of this driver to
         * driver model.
         */
-       baud_divisor = ns16550_calc_divisor(com_port, CONFIG_DEBUG_UART_CLOCK,
-                                           CONFIG_BAUDRATE);
        serial_dout(&com_port->ier, CONFIG_SYS_NS16550_IER);
        serial_dout(&com_port->mcr, UART_MCRVAL);
        serial_dout(&com_port->fcr, UART_FCR_DEFVAL);
 
-       serial_dout(&com_port->lcr, UART_LCR_BKSE | UART_LCRVAL);
-       serial_dout(&com_port->dll, baud_divisor & 0xff);
-       serial_dout(&com_port->dlm, (baud_divisor >> 8) & 0xff);
+       if (CONFIG_BAUDRATE > 0) {
+               baud_divisor = ns16550_calc_divisor(com_port,
+                                                   CONFIG_DEBUG_UART_CLOCK,
+                                                   CONFIG_BAUDRATE);
+
+               serial_dout(&com_port->lcr, UART_LCR_BKSE | UART_LCRVAL);
+               serial_dout(&com_port->dll, baud_divisor & 0xff);
+               serial_dout(&com_port->dlm, (baud_divisor >> 8) & 0xff);
+       }
        serial_dout(&com_port->lcr, UART_LCRVAL);
 }
 
-- 
2.34.1