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serial: zynq: Use DIV_ROUND_CLOSEST() to calcurate divider value

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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>
This commit is contained in:
Kunihiko Hayashi 2022-07-13 10:38:59 +09:00 committed by Michal Simek
parent 65fc1697db
commit c6bceb4e36
1 changed files with 1 additions and 1 deletions
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2
drivers/serial/serial_zynq.c
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@ -75,7 +75,7 @@ static void _uart_zynq_serial_setbrg(struct uart_zynq *regs,
* 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;