linux-kernel - Re: [PATCH] drm/i915: Take modeset locks around intel_modeset_setup_hw

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Date:	Mon, 2 Dec 2013 14:12:19 +0200
From:	Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:	Paul Bolle <pebolle@...cali.nl>
Cc:	intel-gfx@...ts.freedesktop.org, Daniel Vetter <daniel@...ll.ch>,
	Dave Airlie <airlied@...hat.com>, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/i915: Take modeset locks around
 intel_modeset_setup_hw_state()

On Mon, Dec 02, 2013 at 11:00:29AM +0100, Paul Bolle wrote:
> On Mon, 2013-12-02 at 11:08 +0200, ville.syrjala@...ux.intel.com wrote:
> > From: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> > 
> > Some lower level things get angry if we don't have modeset locks
> > during intel_modeset_setup_hw_state(). Actually the resume and
> > lid_notify codepaths alreday hold the locks, but the init codepath
> > doesn't, so fix that.
> > 
> > Signed-off-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> > ---
> > Totally untested, but looks correct to me.
> 
> I assume I need to test this, on top of 7c063c725987 ("drm/i915: take
> mode config lock around crtc disable at suspend"), to see if this makes
> the WARNING that I currently see at boot go away?

Yeah that would be nice.

> Paul Bolle
> 
> >  drivers/gpu/drm/i915/intel_display.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > index 080f6fd..114db51 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -11046,7 +11046,9 @@ void intel_modeset_gem_init(struct drm_device *dev)
> >  
> >  	intel_setup_overlay(dev);
> >  
> > +	drm_modeset_lock_all(dev);
> >  	intel_modeset_setup_hw_state(dev, false);
> > +	drm_modeset_unlock_all(dev);
> >  }
> >  
> >  void intel_modeset_cleanup(struct drm_device *dev)

-- 
Ville Syrjälä
Intel OTC
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