[Intel-gfx] [PATCH] drm/i915/bdw: Restore PPAT on thaw

[Chris Wilson]

On Tue, Mar 18, 2014 at 04:09:37PM -0700, Ben Widawsky wrote:
> Apparently it is wiped out from under us, and we get some really fun
> caching artifacts upon resume (it seems to be WB for all types by
> default).
> 
> Reported-by: James Ausmus <james.ausmus at intel.com>
> Signed-off-by: Ben Widawsky <ben at bwidawsk.net>

Perhaps related to  https://bugs.freedesktop.org/show_bug.cgi?id=76113 ?
-Chris

> ---
>  drivers/gpu/drm/i915/i915_gem_gtt.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index bd016e2..1b45a04 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -30,6 +30,8 @@
>  #include "i915_trace.h"
>  #include "intel_drv.h"
>  
> +static void gen8_setup_private_ppat(struct drm_i915_private *dev_priv);
> +
>  bool intel_enable_ppgtt(struct drm_device *dev, bool full)
>  {
>  	if (i915.enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev))
> @@ -1371,8 +1373,10 @@ void i915_gem_restore_gtt_mappings(struct drm_device *dev)
>  	}
>  
>  
> -	if (INTEL_INFO(dev)->gen >= 8)
> +	if (INTEL_INFO(dev)->gen >= 8) {
> +		gen8_setup_private_ppat(dev_priv);
>  		return;
> +	}
>  
>  	list_for_each_entry(vm, &dev_priv->vm_list, global_link) {
>  		/* TODO: Perhaps it shouldn't be gen6 specific */
> -- 
> 1.9.0
> 
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> 

-- 
Chris Wilson, Intel Open Source Technology Centre