this patch from greg k-h fixes this problem. thx!
(the patch also works on 2.4.17 ...)
# USB: fix data toggle problem for pl2303 driver.
diff -Nru a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
--- a/drivers/usb/serial/pl2303.c Tue Sep 2 16:49:31 2003
+++ b/drivers/usb/serial/pl2303.c Tue Sep 2 16:49:31 2003
@@ -404,6 +404,9 @@
dbg("%s - port %d", __FUNCTION__, port->number);
+ usb_clear_halt(serial->dev, port->write_urb->pipe);
+ usb_clear_halt(serial->dev, port->read_urb->pipe);
+
#define FISH(a,b,c,d) \
result=usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,0), \
b, a, c, d, buf, 1, 100); \
> On Tue, Aug 26, 2003 at 12:36:00PM +0200, Norbert Federa wrote:
> > hi,
> >
> > i did again some testing with several pl2303 based adapters
> > under linux-2.6.0-test4.
> >
> > the serial apps still have severe problems.
> > i've done some more testing and it seems that the first
> > byte coming to the pl2303 _never_ arrives in a read() from
> > /dev/ttyUSB0 - except in the _first_ read after reinsertion
> > of the pl2303 based device!
> >
> > the problem is very easy to reproduce:
> >
> > just connect a serial cross link cable to /dev/ttyS0 and the
> > other end to /dev/ttyUSB0 (the pl2303) and run the
> > attached debug.c file.
> >
> > this program expects 2 params: read device and write device
> > eg: ./debug /dev/ttyUSB /dev/ttyS0
> >
> > a test string ("Hello World") is written to argv[2] and
> > the data read from argv[1] is written to stderr.
> >
> >
> > i can reproduce the following on several uhci based boxes:
>
> I can reproduce this too :(
>
> Hm, wonder if the same fix I did for the io_ti driver will work here.
> I'll try testing that tomorrow.
>
> If you want to try it, look at the open() call in the io_ti driver for
> the lines to add to reset the endpoints.
>
> thanks,
>
> greg k-h
>
>
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