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

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Message-ID: <554A3D83.8040707@linutronix.de>
Date:	Wed, 06 May 2015 18:12:51 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Nicolae Rosia <nicolae.rosia@...il.com>,
	jiwang <jiada_wang@...tor.com>
CC:	Sebastian Andrzej Siewior <sebastian@...akpoint.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
Subject: Re: [PATCH v1 11/15] serial: imx: initialized DMA w/o HW flow enabled

On 05/06/2015 06:08 PM, Nicolae Rosia wrote:
> Hi,
> I believe I'm also affected by this BUG. I'm receiving lots of 0 and 1
> (ASCII, as presented by cat /dev/ttymxcX) and RX buffer is
> overflowing.
> 
>> 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.
>>
> 
> Have you submited a patch for this issue?
> How do I disable SDMA?

I reverted this patch. I am going to send a revert to Greg tomorrow
including why this is done and CC stable. I haven't yet received a
working SDMA firmware nor a hint where it is.

> Best regards,
> Nicolae Rosia

Sebastian
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