From mboxrd@z Thu Jan 1 00:00:00 1970 From: Laurent Pinchart Subject: Re: [PATCH v1] 8250: add support for DTR/DSR hardware flow control Date: Thu, 7 Aug 2008 10:32:14 +0200 Message-ID: <200808071032.16709.laurentp@cse-semaphore.com> References: <20080806211438.GB20355@redhat.com> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart1617761.7FS0RQYFOf"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit Return-path: Received: from mailrelay005.isp.belgacom.be ([195.238.6.171]:44236 "EHLO mailrelay005.isp.belgacom.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752860AbYHGIcW (ORCPT ); Thu, 7 Aug 2008 04:32:22 -0400 In-Reply-To: <20080806211438.GB20355@redhat.com> Sender: linux-serial-owner@vger.kernel.org List-Id: linux-serial@vger.kernel.org To: Aristeu Rozanski Cc: linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org --nextPart1617761.7FS0RQYFOf Content-Type: text/plain; charset="ansi_x3.4-1968" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Hi, On Wednesday 06 August 2008, Aristeu Rozanski wrote: > This patch adds support for DTR/DSR hardware flow control on 8250 driver = on > x86 machines. It's done by adding a CDTRDSR flag to work just like CRTSCT= S, > which is not done on other architectures on purpose (so each maintainer c= an > allocate it).=20 It's funny, serial flow control hasn't been discussed for a long time, and = you're the third person to start a flow control related thread on this mail= ing list in a few days. > This patch was tested with success with a serial printer configured with a > small buffer and DTR/DSR flow control. >=20 > This is based on the work of Michael Westermann > (http://lkml.org/lkml/2007/8/31/133)=20 >=20 > Comments more than welcome. Please read the '[PATCH/RFC] 8250: Auto RS485 direction control' thread for= background information. In a nutshell we need more than just CTS/RTS and D= TR/DSR, and we don't have enough c_cflags bits. We will probably have to cr= eate a new ioctl. Best regards, =2D-=20 Laurent Pinchart CSE Semaphore Belgium Chaussee de Bruxelles, 732A B-1410 Waterloo Belgium T +32 (2) 387 42 59 =46 +32 (2) 387 42 75 --nextPart1617761.7FS0RQYFOf Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (GNU/Linux) iEYEABECAAYFAkiasxAACgkQ8y9gWxC9vpdQXACgpyNiK2ykVch+yyWjB6toQLaJ 5zcAoOE/dN52SgZlwX5jTyy5FhYPmdho =g0nA -----END PGP SIGNATURE----- --nextPart1617761.7FS0RQYFOf--