drm/i915: Clear per-engine fault register as early as possible

From gen6, the hardware tracks address lookup failures and we should
clear those registers upon startup to prevent false positives. However,
this was happening before we have the engines defined (intel_uncore_init())
and the for_each_engine loop was just a nop. The earliest we can call
this is inside intel_engines_init_mmio().

Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Michel Thierry <michel.thierry@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171111004448.12360-1-michel.thierry@intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/intel_engine_cs.c

@@ -289,6 +289,8 @@ int intel_engines_init_mmio(struct drm_i915_private *dev_priv)
 
 	device_info->num_rings = hweight32(mask);
 
+	i915_check_and_clear_faults(dev_priv);
+
 	return 0;
 
 cleanup:

drivers/gpu/drm/i915/intel_uncore.c

@@ -1420,8 +1420,6 @@ void intel_uncore_init(struct drm_i915_private *dev_priv)
 
 	iosf_mbi_register_pmic_bus_access_notifier(
 		&dev_priv->uncore.pmic_bus_access_nb);
-
-	i915_check_and_clear_faults(dev_priv);
 }
 
 void intel_uncore_fini(struct drm_i915_private *dev_priv)