linux-kernel - Re: [PATCH 11/13] arm: dts: dra7: add DMA properties for UART

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Message-ID: <5464F9A1.9080901@linutronix.de>
Date:	Thu, 13 Nov 2014 19:34:09 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>
CC:	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	tony@...mide.com, balbi@...com, gregkh@...uxfoundation.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH 11/13] arm: dts: dra7: add DMA properties for UART

On 11/05/2014 08:43 PM, Lennart Sorensen wrote:
> I managed to get something dma related on uart3.  But it isn't happy:
> 
> [   95.577401] DMA misaligned error with device 53
> repeated many times.
> 
> I wonder if the dma support isn't quite working for the omap572x yet in
> this tree (ti's 3.12.y tree), or maybe it is picky and the driver still
> needs a bit of work.

misaligned dma? I haven't seen any alignment requirement for SDMA/EDMA
and I haven't seen this error on beagle board, am335x-evm or dra7-evm.

> I have had no issues on uart7 and 8 without dma.

So basically what you are saying is that DMA (no matter which channel)
gives you this error and without DMA it works fine?

Sebastian
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