On Fri, Jun 1, 2012 at 12:52 PM, Russell King - ARM Linux
[off-list ref] wrote:

[Me]

quoted

quoted

+ ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?*/
+ ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? spin_lock(&waiting->lock);
+ ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? pl08x_start_next_txd(waiting);
+ ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? spin_unlock(&waiting->lock);

I've seen this construct in the past and have no better suggestions...

I have no way to test whether my statement is true as I can't get enough
DMA engine usage through the PL011 transmit support to check what happens.
So the statement is purely theoretical.

Doesn't memcpy work on the Versatile?

What I did to stress the PB11MPcore was to compile in the DMAengine
test client and torture the DMAC with a bunch of parallell memcpy()
threads causing it to fail channel allocation and other nasty stuff,
then put the console on DMA and pour a lot of text in and out of the
console on top of that.

Yours,
Linus Walleij