linux-kernel - Re: [PATCH] tty/serial: Prevent drop of DCD on suspend for Tegra UARTs

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Message-ID: <20111012125647.6b9ec66e@lxorguk.ukuu.org.uk>
Date:	Wed, 12 Oct 2011 12:56:47 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Jiri Slaby <jirislaby@...il.com>,
	Stephen Warren <swarren@...dia.com>,
	Olof Johansson <olof@...om.net>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Alan Cox <alan@...ux.intel.com>,
	Allen Martin <AMartin@...dia.com>,
	Tom Warren <twarren@...dia.com>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tty/serial: Prevent drop of DCD on suspend for Tegra
 UARTs

> NOTE: If we have people that are using UARTA on a Tegra and need to
> control DTR, we'll need to either add a separate port type for UARTA
> or we'll need to add some tegra-specific code to detect whether the
> DTR needs to be left high.

I have two problems with this change

- It adds more special cases into the 8250.c core code
- It breaks the UARTA port (which is a regression so not acceptable for
  upstream merging)

I think you should simply provide your platform with an appropriate
serial_in/serial_out method that does the needed masking. That way its
kept isolated from everyone else.

Alan
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