[PATCH 01/10] serial: mvebu-uart: fix calculation of clock divisor
From: Pali Rohár <pali@kernel.org>
Date: 2021-06-24 22:50:07
Also in:
linux-clk, linux-serial, lkml
Subsystem:
marvell armada 3700 serial driver, the rest, tty layer and serial drivers · Maintainers:
Pali Rohár, Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
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")
---
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 e0c00a1b0763..f81bfdaa608c 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;
--
2.20.1
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