Re: [drm:__gen6_gt_force_wake_mt_get] *ERROR* Timed out waiting for forcewake old ack to clear.?

Chris Wilson
2012-10-17T22:58:42Z

On Wed, 17 Oct 2012 15:44:54 -0700, Ben Widawsky <ben@bwidawsk.net> wrote:
> On Wed, 17 Oct 2012 08:17:51 +0200
> Oleksij Rempel <bug-track@fisher-privat.net> wrote:
>
> > Hallo all,
> >
> > i get on Asus Zenbook UX32A [IVB] fallowing errors:
> > [ 4.464893] [drm:__gen6_gt_force_wake_mt_get] *ERROR* Timed out
> > waiting for forcewake old ack to clear.
> > [ 6678.604211] [drm:__gen6_gt_force_wake_mt_get] *ERROR* Timed out
> > waiting for forcewake old ack to clear.
> > [ 9144.381337] [drm:__gen6_gt_force_wake_mt_get] *ERROR* Timed out
> > waiting for forcewake old ack to clear.
> > [ 9189.374375] [drm:__gen6_gt_force_wake_mt_get] *ERROR* Timed out
> > waiting for forcewake old ack to clear.
> >
> > I get it after resume from suspend to ram.
> > Is it some thing you need to know?
>
> Is this a regression?

No, the issue appears to be that we do not sanitise the forcewake upon
takeover from BIOS and as such we leave it with RC6 suspended and no
pending clear of the forcewake. The timeout of the first wait after
boot/resume is to be expected.

I believe Mika Kuoppala was volunteered to write a small patch to
address this...
-Chris

--
Chris Wilson, Intel Open Source Technology Centre