linux-kernel - Re: Kernel 2.6.30 and udevd problem

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Message-ID: <20090722124436.0daa2079@jbarnes-g45>
Date:	Wed, 22 Jul 2009 12:44:36 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Alberto Gonzalez <alberto6674@...il.com>
Cc:	Michal Soltys <soltys@....info>, Dave Airlie <airlied@...ux.ie>,
	Kay Sievers <kay.sievers@...y.org>,
	linux-kernel@...r.kernel.org, linux-hotplug@...r.kernel.org
Subject: Re: Kernel 2.6.30 and udevd problem

On Wed, 22 Jul 2009 20:43:56 +0200
Alberto Gonzalez <alberto6674@...il.com> wrote:

> On Wednesday 22 July 2009 19:12:51 Jesse Barnes wrote:
> > Ah I must have been looking at the wrong register.  This one makes
> > it look like one of your HDMI hotplug bits is getting stuck (HDMIC
> > in particular).  This might not even be wired up on your platform...
> 
> Yes, I don't use HDMI, my screen is attached via VGA
> >
> > This test hack should prevent us from responding to those
> > interrupts...
> 
> I've been hitting it hard for over an hour with all the usual tricks
> to trigger it (and a few reboots) and I've been unable to reproduce
> the problem with this patch. Before I could trigger it reliably in a
> few minutes, so I'm pretty sure this patch fixes it. If something new
> comes up, I'll let you know anyway.

Hm, so this type of interrupt problem is *supposed* to be handled by
setting of the PEG_BAND_GAP_DATA reg (low bits set to 0xd).  Do you
have that in your tree?  Does git master have this problem?

Maybe we need to add a patch to 2.6.30.x to set PEG_BAND_GAP_DATA as a
workaround (git master already has code to do this properly for HDMI
and DP outputs afaict).

-- 
Jesse Barnes, Intel Open Source Technology Center
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