linux-kernel - Re: [Intel-gfx] [PATCH v2] Partially revert "drm/i915: unconditionally use mt forcewake on hsw/ivb"

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Message-ID: <20130710060414.GF18285@phenom.ffwll.local>
Date:	Wed, 10 Jul 2013 08:04:14 +0200
From:	Daniel Vetter <daniel@...ll.ch>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	David Airlie <airlied@...ux.ie>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	linux-kernel@...r.kernel.org,
	Mika Kuoppala <mika.kuoppala@...el.com>
Subject: Re: [Intel-gfx] [PATCH v2] Partially revert "drm/i915:
 unconditionally use mt forcewake on hsw/ivb"

On Tue, Jul 09, 2013 at 04:00:31PM -0700, Guenter Roeck wrote:
> This patch partially reverts commit 36ec8f877481449bdfa072e6adf2060869e2b970 for
> IvyBridge CPUs.
> 
> The original 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 for IvyBridge CPUs fixes the issue.
> 
> Issue a warning if the CPU is IvyBridge and mt forcewake is disabled, since
> this condition can result in secondary issues.
> 
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=60541
> 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>
Picked up for -fixes, thanks for the patch.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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