[Intel-gfx] [PATCH 10/11] drm/i915: Call intel_uncore_early_sanitize() during resume

[Ville Syrjälä]

On Thu, Sep 19, 2013 at 07:18:54PM -0300, Paulo Zanoni wrote:
> 2013/9/16  <ville.syrjala at linux.intel.com>:
> > From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> >
> > Call intel_uncore_early_sanitize() first thing during resume to prevent
> > stale BIOS leftovers from being reported as unclaimed register access.
> 
> Just out of curiosity: do you actually need this patch to avoid error
> messages? The change makes sense, but since we didn't need it so far,
> I wonder if maybe it's something we're doing wrong that's causing the
> need to sanitize.

It does get rid of an error message on my HSW machine during hibernate.

I just noticed that I didn't have CONFIG_SND_HDA_I915 enabled, but I
just tried to enable it and I still got the error. The latest BIOS
didn't fix it either. And I also tried to clear the error as the last
thing before we suspend the device, and that didn't help either. So it
does look like the BIOS does something silly.


> > Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/i915_drv.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> > index fdf3eef..3d25731 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.c
> > +++ b/drivers/gpu/drm/i915/i915_drv.c
> > @@ -670,6 +670,8 @@ int i915_resume(struct drm_device *dev)
> >
> >         pci_set_master(dev->pdev);
> >
> > +       intel_uncore_early_sanitize(dev);
> > +
> >         intel_uncore_sanitize(dev);
> >
> >         /*
> > --
> > 1.8.1.5
> >
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
> 
> 
> 
> -- 
> Paulo Zanoni

-- 
Ville Syrjälä
Intel OTC