linux-kernel - Re: [PATCH v1 11/15] serial: imx: initialized DMA w/o HW flow enabled

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Date:	Fri, 17 Apr 2015 18:18:39 +0900
From:	jiwang <jiada_wang@...tor.com>
To:	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
CC:	<gregkh@...uxfoundation.org>, <jslaby@...e.cz>,
	<linux-serial@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<anton_bondarenko@...tor.com>, <dirk.behme@...bosch.com>,
	<bigeasy@...utronix.de>
Subject: Re: [PATCH v1 11/15] serial: imx: initialized DMA w/o HW flow enabled

Hello Sebastian

On 04/13/2015 05:06 PM, Sebastian Andrzej Siewior wrote:
> On Mon, Apr 13, 2015 at 04:40:15PM +0900, jiwang wrote:
>> Hi Sebastian
> Hi Jiada,
>
>>> My question is how was this tested. Before your patch none of my boards
>>> were using DMA because RTS/CTS is not in use and this was a key
>>> requirement. Now SDMA goes crazy. Is there a SDMA firmware required for
>>> this to work?
>> We tested the patch set with our modified kernel tree,
>> and I find upstream kernel is not building SDMA firmware,
>> I will submit another patch to add it.
> Please make sure it is tagged stable. There is no hint that this is required
> and as of it now, it breaks v4.0.
Due to missing of SDMA firmware, uart sdma mode is broken,
but it is uncovered by this commit on your environment.

> One question, where do you have the firmware from? I picked the one from FSL's
> v3.10 SDK and I ended up with FIFO-overflows so it was clearly the wrong one
> (and the built-in SDMA firmware does not work as expected as you mentioned).
I got sdma firmware from FSL kernel tree.
> Is this firmware only required the imx6 series or also for older versions like
> imx5?
the firmware only supports imx6 series, AFAIK,
I checked with Freescale imx6 support team, due to
licensing issue, I am not entitled to upstream FSL SDMA firmware.
so seems currently disable SDMA support for uart is our only option
at the moment.

Thanks,
Jiada
>> Thanks,
>> Jiada
> Sebastian

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