linux-kernel - Re: [PATCH v4] tty: serial: men_z135_uart: Fix driver for changes in hardware

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Date:	Wed, 5 Nov 2014 17:39:53 +0100
From:	Johannes Thumshirn <johannes.thumshirn@....de>
To:	Peter Hurley <peter@...leysoftware.com>
CC:	Johannes Thumshirn <johannes.thumshirn@....de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, <linux-serial@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] tty: serial: men_z135_uart: Fix driver for changes in
 hardware

On Mon, Nov 03, 2014 at 04:26:39PM -0500, Peter Hurley wrote:
> On 11/03/2014 04:01 PM, Peter Hurley wrote:
> > On 11/03/2014 11:05 AM, Johannes Thumshirn wrote:
> >> * Enable the handling of UART core's automatic flow control feature.
> >>   When AFE is active disable generation of modem status IRQs.
> >
> > So HUPCL doesn't work when CRTSCTS is set?
>
> Sorry, I meant !CLOCAL. IOW,
>
> 'So !CLOCAL doesn't work when CRTSCTS is set?'

Yes, unfortunately

>
> > Is this because there's actually a problem with the IP core that
> > MSIs trash the autoCTS state, or is the problem that the driver
> > just shouldn't be calling uart_handle_cts_change() when autoCTS is
> > on?
>

>From our investigations it looks like it trashes the autoCTS state.

Johannes
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