From: Pali Rohár Date: Thu, 24 Jun 2021 22:49:00 +0000 (+0200) Subject: serial: mvebu-uart: fix calculation of clock divisor X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=9078204ca5c33ba20443a8623a41a68a9995a70d;p=linux.git serial: mvebu-uart: fix calculation of clock divisor The clock divisor should be rounded to the closest value. Signed-off-by: Pali Rohár Fixes: 68a0db1d7da2 ("serial: mvebu-uart: add function to change baudrate") Cc: stable@vger.kernel.org # 0e4cf69ede87 ("serial: mvebu-uart: clarify the baud rate derivation") Link: https://lore.kernel.org/r/20210624224909.6350-2-pali@kernel.org Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c index 04c41689d81c9..f3ecbcf495ee0 100644 --- a/drivers/tty/serial/mvebu-uart.c +++ b/drivers/tty/serial/mvebu-uart.c @@ -463,7 +463,7 @@ static int mvebu_uart_baud_rate_set(struct uart_port *port, unsigned int baud) * makes use of D to configure the desired baudrate. */ m_divisor = OSAMP_DEFAULT_DIVISOR; - d_divisor = DIV_ROUND_UP(port->uartclk, baud * m_divisor); + d_divisor = DIV_ROUND_CLOSEST(port->uartclk, baud * m_divisor); brdv = readl(port->membase + UART_BRDV); brdv &= ~BRDV_BAUD_MASK;