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tty: serial: 8250_mtk: Fix quot calculation
authorMatthias Brugger <matthias.bgg@gmail.com>
Thu, 9 Oct 2014 16:23:31 +0000 (18:23 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 6 Nov 2014 04:12:02 +0000 (20:12 -0800)
The calculation of value quot for highspeed register set to three
was wrong. This patch fixes the calculation so that the serial port
for baudrates bigger then 576000 baud is working correctly.

Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/tty/serial/8250/8250_mtk.c patch | blob | blame | history

diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c
index 8f37d57165ecf49866b839c301fe1759c34551a9..de7aae523b3728c10abc6c4000bd9b5f44786083 100644 (file)
--- a/drivers/tty/serial/8250/8250_mtk.c
+++ b/drivers/tty/serial/8250/8250_mtk.c
@@ -81,7 +81,7 @@ mtk8250_set_termios(struct uart_port *port, struct ktermios *termios,
                /* Set to highest baudrate supported */
                if (baud >= 1152000)
                        baud = 921600;
-               quot = DIV_ROUND_CLOSEST(port->uartclk, 256 * baud);
+               quot = (port->uartclk / (256 * baud)) + 1;
        }
 
        /*