[Intel-gfx] [PATCH] drm/i915/vlv: disable PPGTT on early revs v3

[Ville Syrjälä]

On Fri, Jun 13, 2014 at 09:28:33AM -0700, Jesse Barnes wrote:
> Early revs didn't have PPGTT support, so disable there.
> 
> v2: add debug msg when disabling on early stepping
> v3: enable on other B3 packages as well (untested) (Ville)
> 
> References: https://bugs.freedesktop.org/show_bug.cgi?id=79669
> References: https://bugs.freedesktop.org/show_bug.cgi?id=79670
> Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>

I don't have any affected systems myself, but it did fail for me on
a pre-production part and the evidence from the bugs is strong, so:

Acked-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

> ---
>  drivers/gpu/drm/i915/i915_gem_gtt.c |    6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index 8b3cde7..7f226fa 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -63,6 +63,12 @@ static int sanitize_enable_ppgtt(struct drm_device *dev, int enable_ppgtt)
>  	}
>  #endif
>  
> +	/* Early VLV doesn't have this */
> +	if (IS_VALLEYVIEW(dev) && dev->pdev->revision < 0xb) {
> +		DRM_DEBUG_DRIVER("disabling PPGTT on pre-B3 step VLV\n");
> +		return 0;
> +	}
> +
>  	return HAS_ALIASING_PPGTT(dev) ? 1 : 0;
>  }
>  
> -- 
> 1.7.9.5
> 
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-- 
Ville Syrjälä
Intel OTC