PL330 alignment requirement questions

[John Linn]

> -----Original Message-----
> From: Jassi Brar [mailto:jassisinghbrar at gmail.com]
> Sent: Friday, July 08, 2011 7:57 PM
> To: johnlinn at comcast.net
> Cc: linux-arm-kernel at lists.infradead.org
> Subject: Re: PL330 alignment requirement questions
> 
> On Sat, Jul 9, 2011 at 3:26 AM,  <johnlinn at comcast.net> wrote:
> > I'm testing our PL330 with the driver/dma/pl330 driver and see some
> strangeness that's probably my own setup issue.
> >
> > I'm also using drivers/dmatest to test it with memory to memory
> copies. I'm seeing that the copy alignment (copy_align) is not setup
> (it's 0) such that I see errors on some transfers at the end of the
> transfer.
> >
> > If I setup the copy_align to be 3 or larger then I don't see these
> errors. This number doesn't make much sense to me and I'm digging into
> the details (seems like 4 would make sense).  I just wanted to see if
> anyone had tested with dmatest and seen anything similar.
> >
> It might help if you dump length, src_addr and dst_addr of failed
> transfers.
> drivers/dma/pl330.c was not rigorously tested because Samsung drivers
> use their own DMA API.
> Btw, please remember to CC the author.

Thanks Jassi for the input, sounds good on CCing you :).

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