serial: zynq: Use DIV_ROUND_CLOSEST() to calcurate divider value
Since the calulation of "bgen" is rounded down, using a higher
baudrate will result in a larger difference from the actual
baudrate. Should use DIV_ROUND_CLOSEST() like the Linux driver.
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Link: https://lore.kernel.org/r/1657676339-6055-1-git-send-email-hayashi.kunihiko@socionext.com
Signed-off-by: Michal Simek <michal.simek@amd.com>
diff --git a/drivers/serial/serial_zynq.c b/drivers/serial/serial_zynq.c
index 83adfb5..295337a 100644
--- a/drivers/serial/serial_zynq.c
+++ b/drivers/serial/serial_zynq.c
@@ -75,7 +75,7 @@
* Find acceptable values for baud generation.
*/
for (bdiv = 4; bdiv < 255; bdiv++) {
- bgen = clock / (baud * (bdiv + 1));
+ bgen = DIV_ROUND_CLOSEST(clock, baud * (bdiv + 1));
if (bgen < 2 || bgen > 65535)
continue;