linux-kernel - Re: [PATCH 0/5] tty: add flag to suppress ready signalling on open

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Message-ID: <CA+uuBqZtUvdGq9ct1Ltt9dLyc4WvV0x7_KzP487bR45JOh9qfw@mail.gmail.com>
Date:   Mon, 30 Nov 2020 23:18:43 -0800
From:   Mychaela Falconia <mychaela.falconia@...il.com>
To:     Jiri Slaby <jirislaby@...nel.org>
Cc:     Johan Hovold <johan@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Mychaela N . Falconia" <falcon@...ecalypso.org>,
        linux-serial@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] tty: add flag to suppress ready signalling on open

On 11/30/20, Jiri Slaby <jirislaby@...nel.org> wrote:
> The difference to other control flags is that open raises DTR/RTS in any
> case (i.e. including O_NONBLOCK)

Yes, this is the exact root-cause problem I am trying to fix, with Johan's help.

> -- provided baud rate is set (and it is
> for casual serials). That means you cannot open a port to configure it
> (using e.g. setserial) without actually raising the DTR/RTS.

Exactly.

M~