linux-kernel - Re: 64-bit DMA problems with BCM4312 using b43

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Message-Id: <200911132144.24110.mb@bu3sch.de>
Date:	Fri, 13 Nov 2009 21:44:21 +0100
From:	Michael Buesch <mb@...sch.de>
To:	bcm43xx-dev@...ts.berlios.de
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Larry Finger <Larry.Finger@...inger.net>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 64-bit DMA problems with BCM4312 using b43

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.
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