[quoted lines by Johan Hovold on 2010/08/29 at 18:33 +0200]
>I did a quick search for your hardware and it seems that your board is
>using the DTS/RTS lines to put the MCU in reset. The way modem control
>is handled has changed in the ftdi_sio driver and is likely to be the
>cause of your problems.
I've recently had to look into a similar problem. It turns out that the
ftdi_sio driver now manages those lines incorrectly.
Stephan: Would you be able to pick a kernel which has the problem, apply the
attached patch (ftdi_sio.patch) to it, and find out if that resolves your
problem?
--
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--- old/ftdi_sio.c 2010-08-25 18:53:27.552277157 -0400
+++ new/ftdi_sio.c 2010-08-25 18:54:00.596026736 -0400
@@ -2016,9 +2016,6 @@
dev_err(&port->dev,
"urb failed to set to rts/cts flow control\n");
}
-
- /* raise DTR/RTS */
- set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
} else {
/*
* Xon/Xoff code
@@ -2065,9 +2062,6 @@
"urb failed to clear flow control\n");
}
}
-
- /* lower DTR/RTS */
- clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
}
return;
}
