linux-kernel - Re: [PATCH] Revert "drm/i915: unconditionally use mt forcewake on hsw/ivb"

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Date:	Tue, 9 Jul 2013 15:41:31 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, David Airlie <airlied@...ux.ie>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Mika Kuoppala <mika.kuoppala@...el.com>
Subject: Re: [PATCH] Revert "drm/i915: unconditionally use mt forcewake on
 hsw/ivb"

On Tue, Jul 09, 2013 at 10:33:22PM +0200, Daniel Vetter wrote:
> On Tue, Jul 09, 2013 at 01:14:09PM -0700, Guenter Roeck wrote:
> > This reverts commit 36ec8f877481449bdfa072e6adf2060869e2b970.
> > 
> > The commit results in repeated 'Timed out waiting for forcewake old ack
> > to clear' messages on a Supermicro C7H61 board (BIOS version 2.00 and 2.00b)
> > with i7-3770K CPU. It ultimately results in a hangup if the system is highly
> > loaded. Reverting the commit fixes the issue.
> > 
> > While I understand that this should be fixed in the BIOS, a more recent BIOS
> > is not available fron the vendor. If/since no better solution is not available,
> > reverting the patch seems to be the way to go (otherwise me and others with
> > the same problem won't be able to run the upstream kernel on affected boards).
> > 
> > Cc: Jesse Barnes <jbarnes@...tuousgeek.org>
> > Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> > Cc: Mika Kuoppala <mika.kuoppala@...el.com>
> > Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> 
> Can you please add the bugzilla link here?
> 
I'll create one and add a reference.

Thanks,
Guenter
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