[PATCH] tty: serial: fsl_lpuart: minimum baud rate support

[Vabhav Sharma]

From: Vabhav Sharma <vabhav.sharma@xxxxxxx>

The formula for the baud rate is
baud rate = "baud clock / ((OSR+1) Ã SBR)

Algorithm used in function lpuart32_serial_setbrg() only changes
the SBR. Even with maxmum value put in, OSR stays at 0x7 and the
lowest baud rate would be ~ 2600 bps

Update the algorithm to allow driver operation at 1200,2400 or
600 bps

Signed-off-by: Vabhav Sharma <vabhav.sharma@xxxxxxx>
---
 drivers/tty/serial/fsl_lpuart.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 90298c4..0fd0fa5f 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1925,6 +1925,10 @@ static void __lpuart32_serial_setbrg(struct uart_port *port,
 			tmp_sbr++;
 		}
 
+		if (tmp_sbr > UARTBAUD_SBR_MASK) {
+			continue;
+		}
+
 		if (tmp_diff <= baud_diff) {
 			baud_diff = tmp_diff;
 			osr = tmp_osr;
-- 
2.7.4