linux-kernel - Re: [ 052/100] drm/i915: Increase the RC6p threshold.

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Date:	Mon, 18 Mar 2013 12:38:28 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	Stéphane Marchesin <marcheu@...omium.org>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: Re: [ 052/100] drm/i915: Increase the RC6p threshold.

On Mon, Mar 18, 2013 at 01:11:09AM +0000, Ben Hutchings wrote:
> On Tue, 2013-03-12 at 15:31 -0700, Greg Kroah-Hartman wrote:
> > 3.8-stable review patch.  If anyone has any objections, please let me know.
> > 
> > ------------------
> > 
> > From: Stéphane Marchesin <marcheu@...omium.org>
> > 
> > commit 0920a48719f1ceefc909387a64f97563848c7854 upstream.
> > 
> > This increases GEN6_RC6p_THRESHOLD from 100000 to 150000. For some
> > reason this avoids the gen6_gt_check_fifodbg.isra warnings and
> > associated GPU lockups, which makes my ivy bridge machine stable.
> > 
> > Signed-off-by: Stéphane Marchesin <marcheu@...omium.org>
> > Acked-by: Jesse Barnes <jbarnes@...tuousgeek.org>
> > Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > 
> > ---
> >  drivers/gpu/drm/i915/intel_pm.c |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > --- a/drivers/gpu/drm/i915/intel_pm.c
> > +++ b/drivers/gpu/drm/i915/intel_pm.c
> > @@ -2572,7 +2572,7 @@ static void gen6_enable_rps(struct drm_d
> >  	I915_WRITE(GEN6_RC_SLEEP, 0);
> >  	I915_WRITE(GEN6_RC1e_THRESHOLD, 1000);
> >  	I915_WRITE(GEN6_RC6_THRESHOLD, 50000);
> > -	I915_WRITE(GEN6_RC6p_THRESHOLD, 100000);
> > +	I915_WRITE(GEN6_RC6p_THRESHOLD, 150000);
> >  	I915_WRITE(GEN6_RC6pp_THRESHOLD, 64000); /* unused */
> >  
> >  	/* Check if we are enabling RC6 */
> 
> Is there any reason why this shouldn't be applied to 3.2.y and 3.4.y?
> The same function and writes are present, only in intel_display.c rather
> than intel_pm.c.

Ah, missed the fact that the file was renamed, nice catch.

I'll apply it to older kernels if the authors and maintainers say it's
safe to do so.

thanks,

greg k-h
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