[PATCH] ep93xx: Implement double buffering for M2M DMA channels

[H Hartley Sweeten]

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