From: Pali Rohár pali@kernel.org
stable inclusion from stable-5.10.50 commit 17451bd0364f0dd2a96eba71cce20e9f8a438ea6 bugzilla: 174522 https://gitee.com/openeuler/kernel/issues/I4DNFY
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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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: 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 gregkh@linuxfoundation.org
Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com Signed-off-by: Chen Jun chenjun102@huawei.com --- drivers/tty/serial/mvebu-uart.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c index 51b0ecabf2ec..908a4ac6b5a7 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;