drm/i915: Fix VLV forcewake after reset

Use the render/media specific forcewake counts to properly restore the
forcewake status after a GPU reset on VLV.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Deepak S <deepak.s@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_uncore.c

@@ -982,10 +982,22 @@ static int gen6_do_reset(struct drm_device *dev)
 	intel_uncore_forcewake_reset(dev);
 
 	/* If reset with a user forcewake, try to restore, otherwise turn it off */
+	if (IS_VALLEYVIEW(dev)) {
+		if (dev_priv->uncore.fw_rendercount)
+			dev_priv->uncore.funcs.force_wake_get(dev_priv, FORCEWAKE_RENDER);
+		else
+			dev_priv->uncore.funcs.force_wake_put(dev_priv, FORCEWAKE_RENDER);
+
+		if (dev_priv->uncore.fw_mediacount)
+			dev_priv->uncore.funcs.force_wake_get(dev_priv, FORCEWAKE_MEDIA);
+		else
+			dev_priv->uncore.funcs.force_wake_put(dev_priv, FORCEWAKE_MEDIA);
+	} else {
 		if (dev_priv->uncore.forcewake_count)
 			dev_priv->uncore.funcs.force_wake_get(dev_priv, FORCEWAKE_ALL);
 		else
 			dev_priv->uncore.funcs.force_wake_put(dev_priv, FORCEWAKE_ALL);
+	}
 
 	/* Restore fifo count */
 	dev_priv->uncore.fifo_count = __raw_i915_read32(dev_priv, GTFIFOCTL) & GT_FIFO_FREE_ENTRIES_MASK;