Intel i915 freeze on latest git

[Chris Wilson]

On Wed, 2 Feb 2011 10:56:57 +0100, Francesco Allertsen <fallertsen at gmail.com> wrote:
> On Tue, Feb 01, 2011 at 04:57:37PM +0000, Chris Wilson wrote:
> > So, if this is the issue, then simply commenting out the tweaking of
> > RSTDBYCTL in ironlake_enable_rc6() should prevent the hang.
> 
> I've tried the following patch
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index d7f237d..7769768 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -6527,7 +6527,6 @@ void ironlake_enable_rc6(struct drm_device *dev)
>  	ADVANCE_LP_RING();
>  
>  	I915_WRITE(PWRCTXA, dev_priv->pwrctx->gtt_offset | PWRCTX_EN);
> -	I915_WRITE(RSTDBYCTL, I915_READ(RSTDBYCTL) & ~RCX_SW_EXIT);
>  }
>  
>  /* Set up chip specific display functions */
> 
> And it still hangs.

Hmm, that was the only change I could spot between the two patches. Care
to disable that function and see what happens? [i.e. put a return before
we write anything to the ring]
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre