serial: sh-sci: Simplify baud rate calculation algorithms

Rewrite the baud rate register value calculations in easier to read
forms. The computed value isn't modified.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index eb59bb235a52..f2fad4d8eb9e 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1818,13 +1818,13 @@ static unsigned int sci_scbrr_calc(unsigned int algo_id, unsigned int bps,
 {
         switch (algo_id) {
         case SCBRR_ALGO_1:
-                return ((freq + 16 * bps) / (16 * bps) - 1);
+                return freq / (16 * bps);
         case SCBRR_ALGO_2:
-                return ((freq + 16 * bps) / (32 * bps) - 1);
+                return DIV_ROUND_CLOSEST(freq, 32 * bps) - 1;
         case SCBRR_ALGO_3:
-                return (((freq * 2) + 16 * bps) / (16 * bps) - 1);
+                return freq / (8 * bps);
         case SCBRR_ALGO_4:
-                return (((freq * 2) + 16 * bps) / (32 * bps) - 1);
+                return DIV_ROUND_CLOSEST(freq, 16 * bps) - 1;
         }
 
         /* Warn, but use a safe default */