serial: mxs-auart: fix baud rate range

Currently mxs-auart doesn't care correctly about the baud rate divisor.
According to reference manual the baud rate divisor must be between
0x000000EC and 0x003FFFC0. So calculate the possible baud rate range
and use it for uart_get_baud_rate().

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index 8d1cd158ca24..7c7f30809849 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -100,6 +100,8 @@
 #define AUART_CTRL2_TXE                         (1 << 8)
 #define AUART_CTRL2_UARTEN                      (1 << 0)
 
+#define AUART_LINECTRL_BAUD_DIV_MAX             0x003fffc0
+#define AUART_LINECTRL_BAUD_DIV_MIN             0x000000ec
 #define AUART_LINECTRL_BAUD_DIVINT_SHIFT        16
 #define AUART_LINECTRL_BAUD_DIVINT_MASK         0xffff0000
 #define AUART_LINECTRL_BAUD_DIVINT(v)           (((v) & 0xffff) << 16)
@@ -659,7 +661,7 @@ static void mxs_auart_settermios(struct uart_port *u,
 {
         struct mxs_auart_port *s = to_auart_port(u);
         u32 bm, ctrl, ctrl2, div;
-        unsigned int cflag, baud;
+        unsigned int cflag, baud, baud_min, baud_max;
 
         cflag = termios->c_cflag;
 
@@ -752,7 +754,9 @@ static void mxs_auart_settermios(struct uart_port *u,
         }
 
         /* set baud rate */
-        baud = uart_get_baud_rate(u, termios, old, 0, u->uartclk);
+        baud_min = DIV_ROUND_UP(u->uartclk * 32, AUART_LINECTRL_BAUD_DIV_MAX);
+        baud_max = u->uartclk * 32 / AUART_LINECTRL_BAUD_DIV_MIN;
+        baud = uart_get_baud_rate(u, termios, old, baud_min, baud_max);
         div = u->uartclk * 32 / baud;
         ctrl |= AUART_LINECTRL_BAUD_DIVFRAC(div & 0x3F);
         ctrl |= AUART_LINECTRL_BAUD_DIVINT(div >> 6);