Re: 64-bit DMA problems with BCM4312 using b43

[Michael Buesch]

On Friday 13 November 2009 21:11:12 Matthew Garrett wrote:
> On Fri, Nov 13, 2009 at 11:21:18AM -0600, Larry Finger wrote:
> 
> > I do not know enough about either the ACPI or DMA code to begin debugging in
> > either of those regions. Any suggestions on debugging strategies, or links to
> > similar problems would be appreciated.
> 
> Could the hardware be highly sensitive to DMA latencies? Take a look at 
> the pm_qos code in ipw2100.

This makes perfect sense, yes. The DMA engine has so many quirks, I wouldn't be
surprised if it couldn't handle pm properly.

-- 
Greetings, Michael.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/