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

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Date:	Fri, 13 Nov 2009 20:11:12 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	Linux ACPI <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	bcm43xx devel <Bcm43xx-dev@...ts.berlios.de>,
	Michael Buesch <mb@...sch.de>,
	Gábor Stefanik <netrolller.3d@...il.com>
Subject: Re: 64-bit DMA problems with BCM4312 using b43

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.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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