From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wolfram Sang Subject: Re: mxs-auart serial driver DMA support? Date: Thu, 12 Jan 2012 12:00:11 +0100 Message-ID: <20120112110010.GF2775@pengutronix.de> References: <4F0E7EB0.2060906@bluegiga.com> <20120112094244.GA2775@pengutronix.de> <4F0EB5BB.1060008@bluegiga.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="0rSojgWGcpz+ezC3" Return-path: Received: from metis.ext.pengutronix.de ([92.198.50.35]:43835 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752506Ab2ALLAP (ORCPT ); Thu, 12 Jan 2012 06:00:15 -0500 Content-Disposition: inline In-Reply-To: <4F0EB5BB.1060008@bluegiga.com> Sender: linux-serial-owner@vger.kernel.org List-Id: linux-serial@vger.kernel.org To: Lauri Hintsala Cc: Sascha Hauer , "linux-arm-kernel@lists.infradead.org" , linux-serial@vger.kernel.org --0rSojgWGcpz+ezC3 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Jan 12, 2012 at 12:28:11PM +0200, Lauri Hintsala wrote: > On 01/12/2012 11:42 AM, Wolfram Sang wrote: > > > >>Any plans to add DMA support for mxs-auart serial driver? I noticed > >>it is impossible to archive full 3.25 Mbs speed with current one. > > > >No plans from our side, currently. >=20 > OK, AUART works fine with 115200 bps but over that it loose data > randomly. I have seen fifo overrun errors during receiving data with > 1Mbs and over. So current driver is unuseful with higher baud rates. Care to send a patch adding this information to Kconfig help text and/or source code? Would be much more useful there, I think. Regards, Wolfram --=20 Pengutronix e.K. | Wolfram Sang | Industrial Linux Solutions | http://www.pengutronix.de/ | --0rSojgWGcpz+ezC3 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) iEYEARECAAYFAk8OvToACgkQD27XaX1/VRvURwCcCcsM1Or07Z7tGAvVHtF1Snzw Gt8AoMI6sLWvwl6evKor4EIAEHqWx04p =+5Rd -----END PGP SIGNATURE----- --0rSojgWGcpz+ezC3-- From mboxrd@z Thu Jan 1 00:00:00 1970 From: w.sang@pengutronix.de (Wolfram Sang) Date: Thu, 12 Jan 2012 12:00:11 +0100 Subject: mxs-auart serial driver DMA support? In-Reply-To: <4F0EB5BB.1060008@bluegiga.com> References: <4F0E7EB0.2060906@bluegiga.com> <20120112094244.GA2775@pengutronix.de> <4F0EB5BB.1060008@bluegiga.com> Message-ID: <20120112110010.GF2775@pengutronix.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Thu, Jan 12, 2012 at 12:28:11PM +0200, Lauri Hintsala wrote: > On 01/12/2012 11:42 AM, Wolfram Sang wrote: > > > >>Any plans to add DMA support for mxs-auart serial driver? I noticed > >>it is impossible to archive full 3.25 Mbs speed with current one. > > > >No plans from our side, currently. > > OK, AUART works fine with 115200 bps but over that it loose data > randomly. I have seen fifo overrun errors during receiving data with > 1Mbs and over. So current driver is unuseful with higher baud rates. Care to send a patch adding this information to Kconfig help text and/or source code? Would be much more useful there, I think. Regards, Wolfram -- Pengutronix e.K. | Wolfram Sang | Industrial Linux Solutions | http://www.pengutronix.de/ | -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 198 bytes Desc: Digital signature URL: