Use direct method for supported baud rates, otherwise use divisors.
Limit baud rate to 12 Mbaud with HX type.
This change has been tested to work with PL-2303HX at 115200, 500000,
1000000, 2000000, 2500000, 3000000 and 4000000 baud rates.
Signed-off-by: Lauri Hintsala <lauri.hintsala@xxxxxxxxxxxx>
---
CC: Johan Hovold <jhovold@xxxxxxxxx>
CC: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
CC: Frank Schäfer <fschaefer.oss@xxxxxxxxxxxxxx>
CC: linux-usb@xxxxxxxxxxxxxxx
Changes since V1:
* added baud rate limit for HX
drivers/usb/serial/pl2303.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index b3d5a35..e84151a 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -161,6 +161,9 @@ static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
.max_baud_rate = 1228800,
.quirks = PL2303_QUIRK_LEGACY,
},
+ [HX] = {
+ .max_baud_rate = 12000000,
+ },
};
static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
@@ -394,16 +397,14 @@ static void pl2303_encode_baud_rate(struct tty_struct *tty,
if (spriv->type->max_baud_rate)
baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
/*
- * Set baud rate to nearest supported value.
- *
- * NOTE: Baud rate 500k can only be set using divisors.
+ * Use direct method for supported baud rates, otherwise use divisors.
*/
baud_sup = pl2303_get_supported_baud_rate(baud);
- if (baud == 500000)
- baud = pl2303_encode_baud_rate_divisor(buf, baud);
+ if (baud == baud_sup)
+ baud = pl2303_encode_baud_rate_direct(buf, baud);
else
- baud = pl2303_encode_baud_rate_direct(buf, baud_sup);
+ baud = pl2303_encode_baud_rate_divisor(buf, baud);
/* Save resulting baud rate */
tty_encode_baud_rate(tty, baud, baud);
--
1.9.1
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