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-rw-r--r--drivers/serial/ns16550.c18
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index f9041aa626..04b604fa2c 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -267,12 +267,26 @@ static inline void _debug_uart_init(void)
serial_dout(&com_port->lcr, UART_LCRVAL);
}
+static inline int NS16550_read_baud_divisor(struct NS16550 *com_port)
+{
+ int ret;
+
+ serial_dout(&com_port->lcr, UART_LCR_BKSE | UART_LCRVAL);
+ ret = serial_din(&com_port->dll) & 0xff;
+ ret |= (serial_din(&com_port->dlm) & 0xff) << 8;
+ serial_dout(&com_port->lcr, UART_LCRVAL);
+
+ return ret;
+}
+
static inline void _debug_uart_putc(int ch)
{
struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
- while (!(serial_din(&com_port->lsr) & UART_LSR_THRE))
- ;
+ while (!(serial_din(&com_port->lsr) & UART_LSR_THRE)) {
+ if (!NS16550_read_baud_divisor(com_port))
+ return;
+ }
serial_dout(&com_port->thr, ch);
}