From: Frank Schaefer <schaefer.frank@xxxxxxx>
This is how "real" UARTs (e.g. 16550) work and AFAIK what RS232 specifies, too.
Make the driver more compliant.
Signed-off-by: Frank Schaefer <schaefer.frank@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
drivers/usb/serial/pl2303.c | 12 ++++++++++--
1 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index 6ed33c7..1128e01 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -622,8 +622,16 @@ static void pl2303_set_termios(struct tty_struct *tty,
/* For reference buf[4]=1 is 1.5 stop bits */
/* For reference buf[4]=2 is 2 stop bits */
if (cflag & CSTOPB) {
- buf[4] = 2;
- dbg("%s - stop bits = 2", __func__);
+ /* NOTE: Comply with "real" UARTs / RS232:
+ * use 1.5 instead of 2 stop bits with 5 data bits
+ */
+ if ((cflag & CSIZE) == CS5) {
+ buf[4] = 1;
+ dbg("%s - stop bits = 1.5", __func__);
+ } else {
+ buf[4] = 2;
+ dbg("%s - stop bits = 2", __func__);
+ }
} else {
buf[4] = 0;
dbg("%s - stop bits = 1", __func__);
--
1.6.4.2
--
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