linux-kernel - Re: [PATCH] serial: Two branches the same in timbuart_set

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Date:	Mon, 15 Mar 2010 14:33:59 +0100
From:	Roel Kluin <roel.kluin@...il.com>
To:	Richard Röjfors <richard.rojfors@...agicore.com>
CC:	linux-serial@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH] serial: Two branches the same in timbuart_set_mctrl()

Hi Richard, 

>>       if (mctrl&  TIOCM_RTS)
>>           iowrite8(TIMBUART_CTRL_RTS, port->membase + TIMBUART_CTRL);
>>       else
>> -        iowrite8(TIMBUART_CTRL_RTS, port->membase + TIMBUART_CTRL);
>> +        iowrite8(TIMBUART_CTRL_CTS, port->membase + TIMBUART_CTRL);
> 
> This is not completely correct. CTS is a read only bit and we are to
> stop signal RTS. So the line should look like:
> iowrite8(0, port->membase + TIMBUART_CTRL);

It appears as if this will also unset TIMBUART_CTRL_CTS (which is
probably ok since it's read-only) but TIMBUART_CTRL_FLSHTX and
TIMBUART_CTRL_FLSHRX as well. If undesired we need something like this:

iowrite8(ioread8(port->membase + TIMBUART_CTRL) & ~TIMBUART_CTRL_RTS,
	port->membase + TIMBUART_CTRL);

If not required I'll send the patch as you suggested.

Regards, Roel
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