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

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Message-ID: <BANLkTinvN_M8FXWc5p8Hy=Z_hSxvHSne4g@mail.gmail.com>
Date:	Tue, 5 Apr 2011 18:11:37 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	keith.packard@...el.com, danie.vettel@...ll.ch
Subject: Re: [PATCH] drm/i915: Disable all outputs early, before KMS takeover

Hi Chris,

On Tue, Apr 5, 2011 at 5:34 PM, Chris Wilson <chris@...is-wilson.co.uk> 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.
>
> v2: Reorder IRQ initialisation to defer until after GEM is setup.
>
> Reported-by: Pekka Enberg <penberg@...nel.org>
> Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
> Tested-by: Daniel Vetter <daniel.vetter@...ll.ch> (855GM)

I no longer get a blank screen after boot but flicker got more
aggressive during boot (it calms down after I've logged in). I see
tons of these in dmesg that don't appear with 2.6.39-rc1:

[   10.175843] [drm:intel_update_fbc],
[   10.183100] [drm:i915_driver_irq_handler], pipe A underrun
[   10.185085] [drm:i915_driver_irq_handler], pipe A underrun
[   10.186082] [drm:i915_driver_irq_handler], pipe A underrun
[   10.187087] [drm:i915_driver_irq_handler], pipe A underrun
[   10.189082] [drm:i915_driver_irq_handler], pipe A underrun
[   10.190085] [drm:i915_driver_irq_handler], pipe A underrun

I've attached the full dmesg.

                          Pekka

Download attachment "dmesg.gz" of type "application/x-gzip" (30692 bytes)