From: "Tobias Arp" <tobiasarp@gmx.de>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: linux-serial@vger.kernel.org
Subject: Re: ST16C654 stoppes transmitting after a while
Date: Tue, 17 Jul 2012 12:05:21 +0200 [thread overview]
Message-ID: <20120717100521.219440@gmx.net> (raw)
In-Reply-To: <20120717105229.17b578a5@pyramind.ukuu.org.uk>
I run kernel 3.2. Upgrading to a newer kernel would be not se easy at the moment.
I am not sure how to check if this change is really lost.
-------- Original-Nachricht --------
> Datum: Tue, 17 Jul 2012 10:52:29 +0100
> Von: Alan Cox <alan@lxorguk.ukuu.org.uk>
> An: "Tobias Arp" <tobiasarp@gmx.de>
> CC: linux-serial@vger.kernel.org
> Betreff: Re: ST16C654 stoppes transmitting after a while
> > I found out that the hw_stopped flag is set to 1 but not set to 0 again
> although CTS is set (measuring with the oscilloscope and reading out the
> modem status register are confirming this / i modified the
> serial8250_get_mctrl function to print out these values).
> >
> > It seems to me that an CTS change (UART_MSR_DCTS) is lost.
> > Could this cause this behaviour?
>
> Possibly you'd need to instrument your kernel as well to prove it. It
> could also be a race in the kernel drivers somewhere. We certainly had
> those in old kernels here and there.
>
> > Any suggestions for a workaround are appreciated.
>
> What kernel are you running ?
> --
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next prev parent reply other threads:[~2012-07-17 10:12 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-17 7:43 ST16C654 stoppes transmitting after a while Tobias Arp
2012-07-17 9:52 ` Alan Cox
2012-07-17 10:05 ` Tobias Arp [this message]
2012-07-17 11:21 ` Alan Cox
2012-07-17 11:36 ` Tobias Arp
2012-07-17 16:38 ` Alan Cox
2012-07-18 6:37 ` Tobias Arp
2012-07-18 7:45 ` Tobias Arp
2012-07-18 11:08 ` Alan Cox
2012-07-18 11:16 ` Tobias Arp
2012-07-20 4:25 ` Tobias Arp
2012-07-20 10:10 ` Tobias Arp
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