drm/i915: Reorganize sprite init

Kill the switch statement from the sprite init code and replace with a
more straightforward if ladder. Now each significant evolution of the
sprite hardware is in its own neat box.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1477411083-19255-5-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_sprite.c

@@ -1067,25 +1067,25 @@ intel_sprite_plane_create(struct drm_device *dev, enum pipe pipe, int plane)
 	}
 	intel_plane->base.state = &state->base;
 
-	switch (INTEL_INFO(dev)->gen) {
-	case 5:
-	case 6:
+	if (INTEL_GEN(dev_priv) >= 9) {
 		intel_plane->can_scale = true;
-		intel_plane->max_downscale = 16;
-		intel_plane->update_plane = ilk_update_plane;
-		intel_plane->disable_plane = ilk_disable_plane;
+		state->scaler_id = -1;
 
-		if (IS_GEN6(dev_priv)) {
-			plane_formats = snb_plane_formats;
-			num_plane_formats = ARRAY_SIZE(snb_plane_formats);
-		} else {
-			plane_formats = ilk_plane_formats;
-			num_plane_formats = ARRAY_SIZE(ilk_plane_formats);
-		}
-		break;
+		intel_plane->update_plane = skl_update_plane;
+		intel_plane->disable_plane = skl_disable_plane;
+
+		plane_formats = skl_plane_formats;
+		num_plane_formats = ARRAY_SIZE(skl_plane_formats);
+	} else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
+		intel_plane->can_scale = false;
+		intel_plane->max_downscale = 1;
+
+		intel_plane->update_plane = vlv_update_plane;
+		intel_plane->disable_plane = vlv_disable_plane;
 
-	case 7:
-	case 8:
+		plane_formats = vlv_plane_formats;
+		num_plane_formats = ARRAY_SIZE(vlv_plane_formats);
+	} else if (INTEL_GEN(dev_priv) >= 7) {
 		if (IS_IVYBRIDGE(dev_priv)) {
 			intel_plane->can_scale = true;
 			intel_plane->max_downscale = 2;
@@ -1094,33 +1094,25 @@ intel_sprite_plane_create(struct drm_device *dev, enum pipe pipe, int plane)
 			intel_plane->max_downscale = 1;
 		}
 
-		if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
-			intel_plane->update_plane = vlv_update_plane;
-			intel_plane->disable_plane = vlv_disable_plane;
+		intel_plane->update_plane = ivb_update_plane;
+		intel_plane->disable_plane = ivb_disable_plane;
 
-			plane_formats = vlv_plane_formats;
-			num_plane_formats = ARRAY_SIZE(vlv_plane_formats);
-		} else {
-			intel_plane->update_plane = ivb_update_plane;
-			intel_plane->disable_plane = ivb_disable_plane;
+		plane_formats = snb_plane_formats;
+		num_plane_formats = ARRAY_SIZE(snb_plane_formats);
+	} else {
+		intel_plane->can_scale = true;
+		intel_plane->max_downscale = 16;
+
+		intel_plane->update_plane = ilk_update_plane;
+		intel_plane->disable_plane = ilk_disable_plane;
 
+		if (IS_GEN6(dev_priv)) {
 			plane_formats = snb_plane_formats;
 			num_plane_formats = ARRAY_SIZE(snb_plane_formats);
+		} else {
+			plane_formats = ilk_plane_formats;
+			num_plane_formats = ARRAY_SIZE(ilk_plane_formats);
 		}
-		break;
-	case 9:
-		intel_plane->can_scale = true;
-		intel_plane->update_plane = skl_update_plane;
-		intel_plane->disable_plane = skl_disable_plane;
-		state->scaler_id = -1;
-
-		plane_formats = skl_plane_formats;
-		num_plane_formats = ARRAY_SIZE(skl_plane_formats);
-		break;
-	default:
-		MISSING_CASE(INTEL_INFO(dev)->gen);
-		ret = -ENODEV;
-		goto fail;
 	}
 
 	if (INTEL_GEN(dev_priv) >= 9) {
@@ -1139,7 +1131,7 @@ intel_sprite_plane_create(struct drm_device *dev, enum pipe pipe, int plane)
 
 	possible_crtcs = (1 << pipe);
 
-	if (INTEL_INFO(dev)->gen >= 9)
+	if (INTEL_GEN(dev_priv) >= 9)
 		ret = drm_universal_plane_init(dev, &intel_plane->base, possible_crtcs,
 					       &intel_plane_funcs,
 					       plane_formats, num_plane_formats,