linux-kernel - Re: imx: RS-485 problems during TX, maybe DMA related

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Message-ID: <CAOMZO5CGoq6FKSE6n9CyQycdtuJ6dAjSL7vJU4ZtXjAPWvdAug@mail.gmail.com>
Date:   Wed, 11 Jan 2017 09:51:29 -0200
From:   Fabio Estevam <festevam@...il.com>
To:     Clemens Gruber <clemens.gruber@...ruber.com>,
        Tim Harvey <tharvey@...eworks.com>
Cc:     "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Nandor Han <nandor.han@...com>,
        Lucas Stach <l.stach@...gutronix.de>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: imx: RS-485 problems during TX, maybe DMA related

Hi Clemens,

On Tue, Jan 10, 2017 at 10:33 PM, Clemens Gruber
<clemens.gruber@...ruber.com> wrote:
> Hi Fabio,
>
> On Sun, Jan 08, 2017 at 07:46:29PM -0200, Fabio Estevam wrote:
>> > What's the revision of the i.MX6Q on your board? Mine is 1.5 (TO 1.3)
>>
>> Mine is a mx6solo rev1.1.
>
> Could it be dependent upon SMP? Do you have an i.MX6Q board around to
> try?

Unfortunately the only hardware I can test RS485 is based on mx6solo.

Adding Tim Harvey, who could probably test RS485 on MX6Q.

Regards,

Fabio Estevam