linux-kernel - Re: [Customers.Eckelmann] [PATCH] serial: imx: disable DMA for RS-485 on i.MX6 SMP

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Message-ID: <CAOMZO5BttM23SqDerppk_9EPP_TBnHm2T6ikn1RufaUHLbwc_A@mail.gmail.com>
Date:   Mon, 17 Jul 2017 08:34:56 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     "Schenk, Gavin" <G.Schenk@...elmann.de>
Cc:     Clemens Gruber <clemens.gruber@...ruber.com>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        Ian Jamison <ian.dev@...ver.com>
Subject: Re: [Customers.Eckelmann] [PATCH] serial: imx: disable DMA for RS-485
 on i.MX6 SMP

Hi Gavin,

On Fri, Jun 23, 2017 at 6:26 AM, Schenk, Gavin <G.Schenk@...elmann.de> wrote:

> 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.