linux-kernel - Re: [PATCH 09/16] tty: serial: 8250_dma: Add a TX trigger workaround for AM33xx

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Message-ID: <54186B89.8050505@linutronix.de>
Date:	Tue, 16 Sep 2014 18:55:37 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Peter Hurley <peter@...leysoftware.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
CC:	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	tony@...mide.com, balbi@...com, gregkh@...uxfoundation.org,
	Alan Cox <alan@...ux.intel.com>
Subject: Re: [PATCH 09/16] tty: serial: 8250_dma: Add a TX trigger workaround
 for AM33xx

On 09/15/2014 07:01 PM, Sebastian Andrzej Siewior wrote:
> On 09/11/2014 04:35 PM, Peter Hurley wrote:
>> I do need to find out if omap hardware sets UART_MSR_DCTS when auto CTS
>> is on. Would you mind running the debug patch below with HW flow control on?
> 
> I didn't forget about this. However I told minicom to use hardware flow
> control (and I see the driver set the HW bit) but I haven't seen that
> uart_handle_cts_change() has been invoked at all. I'm going to check
> two other boards and report then.

No, I don't get into this at all function. So I connected my am335x-evm
with beagle board xm because both of them have an old fashion UART
connector (instead those uart-to-usb). Both configured with HW-Flow and
I haven't seen the function invoked but I saw "port->icount.overrun"
being incremented. This shouldn't happen. So I am a little puzzled here…

>> Regards,
>> Peter Hurley
> 

Sebastian
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