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serial: mvebu-uart: fix calculation of clock divisor

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commit 9078204ca5c33ba20443a8623a41a68a9995a70d upstream.

The clock divisor should be rounded to the closest value.

Signed-off-by: Pali Rohár <pali@kernel.org>
Fixes: 68a0db1d7d ("serial: mvebu-uart: add function to change baudrate")
Cc: stable@vger.kernel.org # 0e4cf69ede ("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 <gregkh@linuxfoundation.org>
This commit is contained in:
Pali Rohár 2021-06-25 00:49:00 +02:00 committed by Greg Kroah-Hartman
parent 8c90ec9965
commit 17451bd036
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/serial/mvebu-uart.c
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@ -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;