linux-kernel - Re: [PATCH 2/2] pch_uart: Delete modem status interrupt enable code

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Message-ID: <4EBB32CA.5020206@dsn.lapis-semi.com>
Date:	Thu, 10 Nov 2011 11:11:22 +0900
From:	Tomoya MORINAGA <tomoya-linux@....lapis-semi.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Alan Cox <alan@...ux.intel.com>, gregkh@...e.de,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	qi.wang@...el.com, yong.y.wang@...el.com, joel.clark@...el.com,
	kok.howg.ewe@...el.com
Subject: Re: [PATCH 2/2] pch_uart: Delete modem status interrupt enable code

Hi Alan,

(2011/11/02 20:00), Alan Cox wrote:
>> Called ".get_mctrl" function, other software can know incoming carrier
>> detection.
>> Or you mean a uart driver must detect incoming carrier with interrupt ?
>
> If a user opens a tty port which has no carrier signal then the open is
> supposed to block until the carrier is raised unless either clocal
> termios or O_NDELAY open flags are set.
>
> That usually means you need to take the carrier raise interrupt in order
> to wake out of open in this case.
>

I understand.
We need to add modem status interrupt processing.

Thanks,
-- 
tomoya
ROHM Co., Ltd.
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