Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755516AbdGXL4F (ORCPT ); Mon, 24 Jul 2017 07:56:05 -0400 Received: from Mail.eckelmann.de ([217.19.183.89]:50921 "EHLO mail.eckelmann.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753211AbdGXLz4 (ORCPT ); Mon, 24 Jul 2017 07:55:56 -0400 X-Greylist: delayed 385 seconds by postgrey-1.27 at vger.kernel.org; Mon, 24 Jul 2017 07:55:56 EDT From: "Schenk, Gavin" To: Fabio Estevam CC: Clemens Gruber , "linux-serial@vger.kernel.org" , "Greg Kroah-Hartman" , "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" , "u.kleine-koenig@pengutronix.de" , Fabio Estevam , "Ian Jamison" Subject: AW: [PATCH] serial: imx: disable DMA for RS-485 on i.MX6 SMP Thread-Topic: [PATCH] serial: imx: disable DMA for RS-485 on i.MX6 SMP Thread-Index: AdMEcgRgekuHKfd3QzSESt3kzpHIlQ== Date: Mon, 24 Jul 2017 11:49:28 +0000 Message-ID: Accept-Language: de-DE, en-US Content-Language: de-DE X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [2a00:1f08:4007:1c00:f18f:626e:56d:3b33] Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by nfs id v6OBu9al003492 Content-Length: 774 Lines: 27 Hi, sorry for the delay! > > Uwe Kleine-König had the idea to disable DMA on the i.MX6dl based > platform via dts and this is our current workaround. > > Please test Ian's patch: > http://marc.info/?l=linux-serial&m=150005865213531&w=2 > > It should fix this DMA problem with RS485. With this patch applied my test works fine on i.MX6dl in RS485-mode and DMA enabled. Regards Gavin Schenk Eckelmann AG Vorstand: Dipl.-Ing. Peter Frankenbach (Sprecher) Dipl.-Wi.-Ing. Philipp Eckelmann Dr.-Ing. Marco Münchhof Dr.-Ing. Frank Uhlemann Vorsitzender des Aufsichtsrats: Hubertus G. Krossa Stv. Vorsitzender des Aufsichtsrats: Dr.-Ing. Gerd Eckelmann Sitz der Gesellschaft: Berliner Str. 161, 65205 Wiesbaden, Amtsgericht Wiesbaden HRB 12636 http://www.eckelmann.de