USB: cp210x: allow more baud rates above 1Mbaud

commit d1620ca9e7bb0030068c3b45b653defde8839dac upstream.

Allow more baud rates to be set in [1M,2M] baud.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Cc: Preston Fick <preston.fick@silabs.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index 07d297f5fe42a89fc8d1203212467238a9d998f3..a5152379cb4c4b84969037c0b6285e16eabb60c6 100644 (file)
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -388,10 +388,10 @@ static unsigned int cp210x_quantise_baudrate(unsigned int baud) {
        else if (baud <= 491520)   baud = 460800;
        else if (baud <= 567138)   baud = 500000;
        else if (baud <= 670254)   baud = 576000;
-       else if (baud <= 1053257)  baud = 921600;
-       else if (baud <= 1474560)  baud = 1228800;
-       else if (baud <= 2457600)  baud = 1843200;
-       else                       baud = 3686400;
+       else if (baud < 1000000)
+               baud = 921600;
+       else if (baud > 2000000)
+               baud = 2000000;
        return baud;
 }
 
@@ -611,7 +611,8 @@ static void cp210x_change_speed(struct tty_struct *tty,
 
        baud = tty->termios->c_ospeed;
 
-       /* This maps the requested rate to a rate valid on cp2102 or cp2103.
+       /* This maps the requested rate to a rate valid on cp2102 or cp2103,
+        * or to an arbitrary rate in [1M,2M].
         *
         * NOTE: B0 is not implemented.
         */