linux-kernel - Re: [Intel-gfx] [PATCH] drm/i915: Disable all outputs early, before KMS takeover

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Message-ID: <20110401114429.GA3526@viiv.ffwll.ch>
Date:	Fri, 1 Apr 2011 13:44:30 +0200
From:	Daniel Vetter <daniel@...ll.ch>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	intel-gfx@...ts.freedesktop.org, Pekka Enberg <penberg@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [Intel-gfx] [PATCH] drm/i915: Disable all outputs early, before
 KMS takeover

On Tue, Mar 29, 2011 at 11:46:29AM +0100, Chris Wilson wrote:
> If the outputs are active and continuing to access the GATT when we
> teardown the PTEs, then there is a potential for us to hang the GPU.
> The hang tends to be a PGTBL_ER with either an invalid host access or
> an invalid display plane fetch.

This patch seems to fix resume flakiness (that recently developed
complete reliability in hanging the gpu) on my i855gm. Captured
error_states look as described here. Latest -staging merged into latest
-linus is now again fully reliable at s/r.

Tested-by: Daniel Vetter <daniel.vetter@...ll.ch>
-- 
Daniel Vetter
Mail: daniel@...ll.ch
Mobile: +41 (0)79 365 57 48
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