[PATCH] ep93xx: Implement double buffering for M2M DMA channels
Rafal Prylowski
prylowski at metasoft.pl
Tue Apr 17 03:15:39 EDT 2012
On 2012-04-16 20:59, H Hartley Sweeten wrote:
> On Wednesday, April 11, 2012 12:19 AM, Rafal Prylowski wrote:
>
> Rafal,
>
> This patch still doesn't work on my ep93xx system.
<snip>
> It appears your patch is causing an interrupt storm on my system.
>
Could you please apply the following patch on top of double buffering
patch? I would like to know the state of dma channel when you get
that interrupt storm.
Thanks,
RP
Index: linux-2.6/drivers/dma/ep93xx_dma.c
===================================================================
--- linux-2.6.orig/drivers/dma/ep93xx_dma.c
+++ linux-2.6/drivers/dma/ep93xx_dma.c
@@ -606,6 +606,7 @@ static int m2m_hw_interrupt(struct ep93x
*/
last = list_first_entry(edmac->active.next,
struct ep93xx_dma_desc, node)->txd.cookie;
+ printk("M2M: %x %s\n", status, last ? "last" : "");
/*
* Use M2M DMA Buffer FSM and Control FSM to check current state of
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