[PATCH 9/9 -v2] imx: serial: use tty_encode_baud_rate to set true rate

["Oskar Schirmer" <os@emlix.com>]

real baud rate may be different from the one requested.
for upper layers, set the nearest value to the real rate
in favour of the rate previously requested.

Signed-off-by: Oskar Schirmer <os@emlix.com>
---
 drivers/serial/imx.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/serial/imx.c b/drivers/serial/imx.c
index 1c00e2a..c367160 100644
--- a/drivers/serial/imx.c
+++ b/drivers/serial/imx.c
@@ -818,6 +818,7 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
 	unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
 	unsigned int div, ufcr;
 	unsigned long num, denom;
+	uint64_t tdiv64;
 
 	/*
 	 * If we don't support modem control lines, don't allow
@@ -930,6 +931,12 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
 	rational_best_approximation(16 * div * baud, sport->port.uartclk,
 		1 << 16, 1 << 16, &num, &denom);
 
+	tdiv64 = sport->port.uartclk;
+	tdiv64 *= num;
+	do_div(tdiv64, denom * 16 * div);
+	tty_encode_baud_rate(sport->port.info->port.tty,
+		(speed_t)tdiv64, (speed_t)tdiv64);
+
 	num -= 1;
 	denom -= 1;
 
-- 
1.5.3.7