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From: Stefan Wahren <info@lategoodbye.de>
To: linux-serial@vger.kernel.org
Subject: serial/mxs-auart: Unable to get interrupt counter from user space
Date: Sat, 23 Jun 2012 21:19:40 +0200	[thread overview]
Message-ID: <4FE616CC.9000709@lategoodbye.de> (raw)

Hello,

i'm using Linux 2.6.35 at ARM and i experience the following issue with 
the mxs-auart (App UART). If i transmit and receive data over the serial 
port (using mxs-auart), all the interrupt counter (RX, TX, frame, 
parity, break) accessed from user space (ioctl with TIOCGICOUNT or 
/proc/tty/driver/auart) are zero.

Here is the scenario to reproduce the problem:

1. echoing some characters to the uart device
2. fetch the statistics from proc-Filesystem

Expected results: transmit counter greater than zero

Observed results: transmit counter is always zero

The same szenario on the mxs-duart (Debug UART) doesn't show this problem.

Is this a bug in mxs-auart or just not implemented?


Best Regards
Stefan

             reply	other threads:[~2012-06-23 19:40 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-06-23 19:19 Stefan Wahren [this message]
2012-06-24  2:25 ` serial/mxs-auart: Unable to get interrupt counter from user space Greg KH
2012-06-24  9:14   ` Stefan Wahren
2012-06-24 17:53     ` Greg KH

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