linux-kernel - Re: [PATCH] ep93xx: Implement double buffering for M2M DMA channels

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Date:	Fri, 23 Mar 2012 09:04:46 +0200
From:	Mika Westerberg <mika.westerberg@....fi>
To:	H Hartley Sweeten <hartleys@...ionengravers.com>
Cc:	Rafal Prylowski <prylowski@...asoft.pl>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"vinod.koul@...el.com" <vinod.koul@...el.com>,
	"rmallon@...il.com" <rmallon@...il.com>
Subject: Re: [PATCH] ep93xx: Implement double buffering for M2M DMA channels

On Thu, Mar 22, 2012 at 09:19:10PM -0500, H Hartley Sweeten wrote:

> Did you test this patch or just review it?

I tested and reviewed it.

> On my system it doesn't work. I think it has something to do with the
> changes to m2m_hw_interrupt but I haven't tracked it down yet.
> 
> It looks like what's missing is a:
> 
> 	edmac->edma->hw_submit(edmac);
> 
> But, maybe that's not needed with double buffering?

Did you try without your patch and adding my VIC hack? That's what I did when
I first got this patch and I saw no problems. I tested with audio (M2P),
mmc_spi (M2M) and dmatest (M2M).
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