[Intel-gfx] [PATCH] drm/i915: Suppress hotplug work during PM suspend/resume

[Takashi Iwai]

At Thu, 19 Apr 2012 20:11:53 +0200,
Takashi Iwai wrote:
> 
> At Thu, 19 Apr 2012 13:55:04 -0400,
> Adam Jackson wrote:
> > 
> > On Thu, 2012-04-19 at 18:10 +0200, Takashi Iwai wrote:
> > 
> > > This patch adds a flag to disable the hotplug during PM operation for
> > > avoiding such a race.
> > > 
> > > Cc: <stable at kernel.org>
> > > Signed-off-by: Takashi Iwai <tiwai at suse.de>
> > 
> > This seems simpler (untested):
> 
> This looks promising.  I'll ask a test with your patch.

Tester reported a positive feedback.  But he also experienced with a
blank screen after a couple of S4 resumes.  Now it's being checked
whether it's a regression by the patch or not.

The machine has a problem with S3 anyway, also showing a blank screen
after S3 resume.  So, the problem is likely irrelevant from your
patch, but just to be sure.


thanks,

Takashi

> 
> 
> thanks,
> 
> Takashi
> 
> 
> > diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> > index 1a7559b..1cd77a4 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.c
> > +++ b/drivers/gpu/drm/i915/i915_drv.c
> > @@ -530,11 +530,12 @@ static int i915_drm_thaw(struct drm_device *dev)
> >                         ironlake_init_pch_refclk(dev);
> >  
> >                 drm_mode_config_reset(dev);
> > -               drm_irq_install(dev);
> >  
> >                 /* Resume the modeset for every activated CRTC */
> >                 drm_helper_resume_force_mode(dev);
> >  
> > +               drm_irq_install(dev);
> > +
> >                 if (IS_IRONLAKE_M(dev))
> >                         ironlake_enable_rc6(dev);
> > 
> > - ajax
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