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From: Robert Jarzmik <robert.jarzmik@free.fr>
To: Mike Rapoport <mike@compulab.co.il>
Cc: video4linux-list@redhat.com
Subject: Re: pxa_camera: DMA alignment requirement
Date: Sun, 16 Nov 2008 02:14:20 +0100	[thread overview]
Message-ID: <87ljvktqtv.fsf@free.fr> (raw)
In-Reply-To: <491C002F.4070804@compulab.co.il> (Mike Rapoport's message of "Thu\, 13 Nov 2008 12\:23\:43 +0200")

Mike Rapoport <mike@compulab.co.il> writes:

> Robert Jarzmik wrote:
>> Hello,
>> 
>> In the pxa camera driver, the 3 DMA channels used are MMU page aligned. Does
>> somebody remember where that constraint comes from ?
>> 
>
> As far as I remember, the buffers should be page aligned to allow overlaying of
> captured data.
Ah, so that's it, thanks.

>From what I read on the PXA manual, the only constraint is 16bytes
alignement. Would you also remember who wrote the code, so that I can ask him
where he read about page alignement constraint please ?

Cheers.

--
Robert

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  reply	other threads:[~2008-11-16  1:14 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-11-09 17:01 pxa_camera: DMA alignment requirement Robert Jarzmik
2008-11-13 10:23 ` Mike Rapoport
2008-11-16  1:14   ` Robert Jarzmik [this message]
2008-11-16  7:30     ` Mike Rapoport
2008-11-25 21:18       ` Robert Jarzmik

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