drm/i915: pending_flip_is_done is gen3, name it so

And remove the cargo-culted copy from the valleyview irq handler.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 82bd8b6..c2a4c12 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -541,17 +541,13 @@
 		if (iir & I915_DISPLAY_PIPE_A_VBLANK_INTERRUPT) {
 			drm_handle_vblank(dev, 0);
 			vblank++;
-			if (!dev_priv->flip_pending_is_done) {
-				intel_finish_page_flip(dev, 0);
-			}
+			intel_finish_page_flip(dev, 0);
 		}
 
 		if (iir & I915_DISPLAY_PIPE_B_VBLANK_INTERRUPT) {
 			drm_handle_vblank(dev, 1);
 			vblank++;
-			if (!dev_priv->flip_pending_is_done) {
-				intel_finish_page_flip(dev, 0);
-			}
+			intel_finish_page_flip(dev, 0);
 		}
 
 		if (pipe_stats[pipe] & PIPE_LEGACY_BLC_EVENT_STATUS)
@@ -1494,13 +1490,13 @@
 
 		if (iir & I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT) {
 			intel_prepare_page_flip(dev, 0);
-			if (dev_priv->flip_pending_is_done)
+			if (dev_priv->gen3_flip_pending_is_done)
 				intel_finish_page_flip_plane(dev, 0);
 		}
 
 		if (iir & I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT) {
 			intel_prepare_page_flip(dev, 1);
-			if (dev_priv->flip_pending_is_done)
+			if (dev_priv->gen3_flip_pending_is_done)
 				intel_finish_page_flip_plane(dev, 1);
 		}
 
@@ -1508,7 +1504,7 @@
 			if (pipe_stats[pipe] & vblank_status &&
 			    drm_handle_vblank(dev, pipe)) {
 				vblank++;
-				if (!dev_priv->flip_pending_is_done) {
+				if (!dev_priv->gen3_flip_pending_is_done) {
 					i915_pageflip_stall_check(dev, pipe);
 					intel_finish_page_flip(dev, pipe);
 				}
@@ -2604,6 +2600,10 @@
 	INIT_WORK(&dev_priv->error_work, i915_error_work_func);
 	INIT_WORK(&dev_priv->rps_work, gen6_pm_rps_work);
 
+	/* IIR "flip pending" bit means done if this bit is set */
+	if (IS_GEN3(dev) && (I915_READ(ECOSKPD) & ECO_FLIP_DONE))
+		dev_priv->gen3_flip_pending_is_done = true;
+
 	dev->driver->get_vblank_counter = i915_get_vblank_counter;
 	dev->max_vblank_count = 0xffffff; /* only 24 bits of frame count */
 	if (IS_G4X(dev) || IS_GEN5(dev) || IS_GEN6(dev) || IS_IVYBRIDGE(dev) ||