linux-kernel - Re: [URGENT] Re: bit errors on spitz + voipac

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Date:	Thu, 3 Jun 2010 10:30:06 +0800
From:	Eric Miao <eric.y.miao@...il.com>
To:	Marek Vasut <marek.vasut@...il.com>
Cc:	linux-arm-kernel@...ts.infradead.org, Cyril Hrubis <metan@....cz>,
	Stanislav Brabec <utx@...guin.cz>, dbaryshkov@...il.com,
	arminlitzel@....de, kernel list <linux-kernel@...r.kernel.org>,
	Dirk@...er-online.de, lenz@...wisc.edu, rpurdie@...ys.net,
	omegamoon@...il.com, Pavel Machek <pavel@....cz>,
	thommycheck@...il.com, zaurus-devel@...ts.linuxtogo.org,
	Haojian Zhuang <haojian.zhuang@...il.com>
Subject: Re: [URGENT] Re: bit errors on spitz + voipac

On Thu, Jun 3, 2010 at 8:01 AM, Marek Vasut <marek.vasut@...il.com> wrote:
> Dne Po 8. března 2010 13:16:35 Cyril Hrubis napsal(a):
>> Hi!
>>
>> > - And I see display noise while CF Wi-Fi card is active.
>>
>> Forgotten about this one. See for yourself, notice short black vertical
>> lines flashing randomly.
>>
>> http://atrey.karlin.mff.cuni.cz/~metan/outgoing/zaurus_sickness.mpg
>
> This is not only case of spitz. I've seen LCD image falling apart on pxafb on
> Voipac PXA270 board. The image was like "torn in half and part of it was moved
> to right, the hole between staying white".
>
> This happened exactly when I started doing a DMA transfer from a harddrive
> attached through pata_pxa. It's perfectly replicable. If I disabled DMA and let
> it run only in PIO, the image was fine.
>
> I assume the corruption Pavel was seeing is related. My guess is the problems
> are caused when DMA between the CPU and a companion chip happens. I dunno if the
> DMA controller doesn't have enough power to supply LCD and the companion chip
> with data, but that's one of my guesses.
>
> btw. Adjusting the DMA descriptor length in pata_pxa didn't help.
>

If there is a FIFO attached, may need the FIFO status when the error happens.
And a dump of the DMA registers would also be helpful.
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