From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Rajanikanth H V <rajanikanth.hv@stericsson.com>
Cc: "linux-serial@vger.kernel.org" <linux-serial@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"gregkh@sude.de" <gregkh@sude.de>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: tty/serial: Need clarification on Support for 4+M Baudrate
Date: Thu, 12 Jan 2012 11:49:13 +0000 [thread overview]
Message-ID: <20120112114913.21809bed@pyramind.ukuu.org.uk> (raw)
In-Reply-To: <2B1D156D95AE9B4EAD379CB9E465FE7324AF2A605A@EXDCVYMBSTM005.EQ1STM.local>
On Thu, 12 Jan 2012 10:49:38 +0100
Rajanikanth H V <rajanikanth.hv@stericsson.com> wrote:
> Alan,
>
> Thanks for your response, suggested modification helped to get 4.8M baud
> but not 4.05M as this is being approximated to 4.0M baud which happens in
> tty_termios_encode_baud_rate(...).
Only if you don't have the BOTHER flag set and only for returned data to
user space.
When you do a TCSETS2 ioctl and have BOTHER set as the rate as well as a
c_ispeed/c_ospeed the exactly value is given to the driver.
Alan
next prev parent reply other threads:[~2012-01-12 11:48 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-11 12:19 tty/serial: Need clarification on Support for 4+M Baudrate Rajanikanth H V
2012-01-11 12:30 ` Alan Cox
2012-01-12 9:49 ` Rajanikanth H V
2012-01-12 11:49 ` Alan Cox [this message]
2012-01-12 14:20 ` Rajanikanth H V
2012-01-12 14:39 ` Alan Cox
2012-01-13 14:36 ` Rajanikanth H V
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