From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753666Ab2ALOi2 (ORCPT ); Thu, 12 Jan 2012 09:38:28 -0500 Received: from lxorguk.ukuu.org.uk ([81.2.110.251]:59580 "EHLO lxorguk.ukuu.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753168Ab2ALOi0 (ORCPT ); Thu, 12 Jan 2012 09:38:26 -0500 Date: Thu, 12 Jan 2012 14:39:00 +0000 From: Alan Cox To: Rajanikanth H V Cc: "linux-serial@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "gregkh@sude.de" , "linux-arm-kernel@lists.infradead.org" Subject: Re: tty/serial: Need clarification on Support for 4+M Baudrate Message-ID: <20120112143900.27b92668@pyramind.ukuu.org.uk> In-Reply-To: <2B1D156D95AE9B4EAD379CB9E465FE7324AF2A630D@EXDCVYMBSTM005.EQ1STM.local> References: <20120111121901.GA4034@bnru05> <20120111123025.244a9cf5@pyramind.ukuu.org.uk> <2B1D156D95AE9B4EAD379CB9E465FE7324AF2A605A@EXDCVYMBSTM005.EQ1STM.local> <20120112114913.21809bed@pyramind.ukuu.org.uk> <2B1D156D95AE9B4EAD379CB9E465FE7324AF2A630D@EXDCVYMBSTM005.EQ1STM.local> X-Mailer: Claws Mail 3.7.10 (GTK+ 2.24.8; x86_64-redhat-linux-gnu) Face: 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 Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 12 Jan 2012 15:20:46 +0100 Rajanikanth H V wrote: > Alan, > > FYI: I am not using application, rather I have a Bluetooth driver invoking > encode_baud_rate(...), please find log below. > > I made sure that c_ispeed = c_ospeed = 4.05M Baud, however I see > tty_termios_encode_baud_rate(...) is normalizing to 4.0 > > > manual trace log below: > ====================================================================================== > > 4.05M Arbitrary Baud Setting Sequence: > [ 9.664703] alloc_set_baud_rate_cmd Setting arbitrary baudrate using BOTHER baudrate:89 c_cflag:020000016262 > [ 9.774658] XXXXXX_hci_uart_set_baudrate c_cflag:020000016262 baud:4050000 4050000 seems a bit odd - you want cflag&CBAUD == BOTHER so I'd expect the low bits to end rather different things to 6262 ? So something like struct ktermios new = *tty->termios; new.c_cflag &= ~(CBAUD|CIBAUD); new.c_cflag |= BOTHER; new.c_ispeed = 4050000; new.c_ospeed = 4050000; tty_set_termios(tty, &new); /* Can sleep */ /* Returned new will now hold actual values selected */ should do the trick providing the low level driver supports the rate. Alan