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

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Message-ID: <ADE657CA350FB648AAC2C43247A983F0020696D488E3@AUSP01VMBX24.collaborationhost.net>
Date:	Wed, 21 Mar 2012 12:12:11 -0500
From:	H Hartley Sweeten <hartleys@...ionengravers.com>
To:	Rafal Prylowski <prylowski@...asoft.pl>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"vinod.koul@...el.com" <vinod.koul@...el.com>,
	Mika Westerberg <mika.westerberg@....fi>,
	"rmallon@...il.com" <rmallon@...il.com>
Subject: RE: [PATCH] ep93xx: Implement double buffering for M2M DMA channels

On Tuesday, March 20, 2012 1:09 AM, Rafal Prylowski wrote:
>
> Implement double buffering for M2M DMA channels.
>
> Signed-off-by: Rafal Prylowski <prylowski@...asoft.pl>

Hmm... This isn't working on my ep9307 board...

When the system boots I get stormed with messages:

dma dma1chan0: unknown interrupt!
dma dma1chan0: unknown interrupt!
dma dma1chan0: unknown interrupt!
dma dma1chan1: unknown interrupt!
dma dma1chan1: unknown interrupt!
dma dma1chan1: unknown interrupt!
dma dma1chan0: unknown interrupt!
dma dma1chan0: unknown interrupt!
dma dma1chan1: unknown interrupt!

Note, I have use_dma set for the ep93xx_spi driver and am using mmc_spi.

Also note, without your patch I also get a couple messages:

dma dma1chan1: got interrupt while active list is empty

But, the mmc card is working fine. I haven't tracked down why I get these
yet. Mika, any ideas?

Regards,
Hartley

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