diff options
Diffstat (limited to 'drivers/usb/serial')
| -rw-r--r-- | drivers/usb/serial/pl2303.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c index 693ed7e4871a..61c9f9d28ee9 100644 --- a/drivers/usb/serial/pl2303.c +++ b/drivers/usb/serial/pl2303.c @@ -324,12 +324,20 @@ static int pl2303_baudrate_encode_divisor(int baud, enum pl2303_type type, */ unsigned int A, B; - /* Respect the specified baud rate limits */ - baud = max_t(int, baud, 75); + /* + * NOTE: The Windows driver allows maximum baud rates of 110% of the + * specified maximium value. + * Quick tests with early (2004) HX (rev. A) chips suggest, that even + * higher baud rates (up to the maximum of 24M baud !) are working fine, + * but that should really be tested carefully in "real life" scenarios + * before removing the upper limit completely. + * Baud rates smaller than the specified 75 baud are definitely working + * fine. + */ if (type == HX) - baud = min_t(int, baud, 6000000); + baud = min_t(int, baud, 6000000 * 1.1); else - baud = min_t(int, baud, 1228800); + baud = min_t(int, baud, 1228800 * 1.1); /* Determine factors A and B */ A = 0; B = 12000000 * 32 / baud; /* 12MHz */ |