From: Michael Buesch <mb@bu3sch.de>
To: bcm43xx-dev@lists.berlios.de
Subject: Re: 64-bit DMA problems with BCM4312 using b43
Date: Fri, 13 Nov 2009 21:44:21 +0100
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Cc: Matthew Garrett <mjg59@srcf.ucam.org>,
       Larry Finger <Larry.Finger@lwfinger.net>,
       Linux ACPI <linux-acpi@vger.kernel.org>,
       LKML <linux-kernel@vger.kernel.org>
References: <4AFD958E.1000303@lwfinger.net> <20091113201112.GA5540@srcf.ucam.org>
In-Reply-To: <20091113201112.GA5540@srcf.ucam.org>
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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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