[PATCH 13/25] serial: sh-sci: Take into account sampling rate for max baud rate

Geert Uytterhoeven
2015-11-19T18:45:37Z

The maximum baud rate depends on the sampling rate.
HSCIF has a variable sampling rate and sets s->sampling_rate to zero,
hence use the minimum sampling rate of 8.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
drivers/tty/serial/sh-sci.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index dccea5df5355076a..d82735dd62ae38d8 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1961,7 +1961,10 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
* that the previous boot loader has enabled required clocks and
* setup the baud rate generator hardware for us already.
*/
- max_baud = port->uartclk ? port->uartclk / 16 : 115200;
+ if (port->uartclk)
+ max_baud = port->uartclk / max(s->sampling_rate, 8U);
+ else
+ max_baud = 115200;

baud = uart_get_baud_rate(port, termios, old, 0, max_baud);
if (likely(baud && port->uartclk))
--
1.9.1