Messages in this thread Patch in this message | | | From | Eddie Huang <> | Subject | [PATCH 1/3] tty: serial: Fix mediatek UART driver setting baudrate issue | Date | Wed, 22 Oct 2014 21:12:07 +0800 |
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In mtk8250_set_termios function, calculating quot value can not be zero, otherwise, using DIV_ROUND_CLOSEST(port->uartclk, quot * baud) will fail due to divisor is zero.
Signed-off-by: Eddie Huang <eddie.huang@mediatek.com> --- drivers/tty/serial/8250/8250_mtk.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c index 8f37d57..6f93123 100644 --- a/drivers/tty/serial/8250/8250_mtk.c +++ b/drivers/tty/serial/8250/8250_mtk.c @@ -74,14 +74,14 @@ mtk8250_set_termios(struct uart_port *port, struct ktermios *termios, /* Set to next lower baudrate supported */ if ((baud == 500000) || (baud == 576000)) baud = 460800; - quot = DIV_ROUND_CLOSEST(port->uartclk, 4 * baud); + quot = DIV_ROUND_UP(port->uartclk, 4 * baud); } else { serial_port_out(port, UART_MTK_HIGHS, 0x3); /* Set to highest baudrate supported */ if (baud >= 1152000) baud = 921600; - quot = DIV_ROUND_CLOSEST(port->uartclk, 256 * baud); + quot = DIV_ROUND_UP(port->uartclk, 256 * baud); } /* -- 1.8.1.1.dirty
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