drm/i915: Extract ilk_sprite_ctl()

Pull the code to calculate the ILK-SNB sprite control register value
into a separate function. Allows us to pre-compute it in the future.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170317211808.14693-7-ville.syrjala@linux.intel.comReviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/intel_sprite.c

@@ -659,31 +659,20 @@ ivb_disable_plane(struct drm_plane *plane, struct drm_crtc *crtc)
 	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 }
 
-static void
-ilk_update_plane(struct drm_plane *plane,
-		 const struct intel_crtc_state *crtc_state,
+static u32 ilk_sprite_ctl(const struct intel_crtc_state *crtc_state,
 			  const struct intel_plane_state *plane_state)
 {
-	struct drm_device *dev = plane->dev;
-	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct intel_plane *intel_plane = to_intel_plane(plane);
-	struct drm_framebuffer *fb = plane_state->base.fb;
-	int pipe = intel_plane->pipe;
-	u32 dvscntr, dvsscale;
-	u32 dvssurf_offset, linear_offset;
+	struct drm_i915_private *dev_priv =
+		to_i915(plane_state->base.plane->dev);
+	const struct drm_framebuffer *fb = plane_state->base.fb;
 	unsigned int rotation = plane_state->base.rotation;
 	const struct drm_intel_sprite_colorkey *key = &plane_state->ckey;
-	int crtc_x = plane_state->base.dst.x1;
-	int crtc_y = plane_state->base.dst.y1;
-	uint32_t crtc_w = drm_rect_width(&plane_state->base.dst);
-	uint32_t crtc_h = drm_rect_height(&plane_state->base.dst);
-	uint32_t x = plane_state->base.src.x1 >> 16;
-	uint32_t y = plane_state->base.src.y1 >> 16;
-	uint32_t src_w = drm_rect_width(&plane_state->base.src) >> 16;
-	uint32_t src_h = drm_rect_height(&plane_state->base.src) >> 16;
-	unsigned long irqflags;
+	u32 dvscntr;
 
-	dvscntr = DVS_ENABLE;
+	dvscntr = DVS_ENABLE | DVS_GAMMA_ENABLE;
+
+	if (IS_GEN6(dev_priv))
+		dvscntr |= DVS_TRICKLE_FEED_DISABLE;
 
 	switch (fb->format->format) {
 	case DRM_FORMAT_XBGR8888:
@@ -705,29 +694,50 @@ ilk_update_plane(struct drm_plane *plane,
 		dvscntr |= DVS_FORMAT_YUV422 | DVS_YUV_ORDER_VYUY;
 		break;
 	default:
-		BUG();
+		MISSING_CASE(fb->format->format);
+		return 0;
 	}
 
-	/*
-	 * Enable gamma to match primary/cursor plane behaviour.
-	 * FIXME should be user controllable via propertiesa.
-	 */
-	dvscntr |= DVS_GAMMA_ENABLE;
-
 	if (fb->modifier == I915_FORMAT_MOD_X_TILED)
 		dvscntr |= DVS_TILED;
 
 	if (rotation & DRM_ROTATE_180)
 		dvscntr |= DVS_ROTATE_180;
 
-	if (IS_GEN6(dev_priv))
-		dvscntr |= DVS_TRICKLE_FEED_DISABLE; /* must disable */
-
 	if (key->flags & I915_SET_COLORKEY_DESTINATION)
 		dvscntr |= DVS_DEST_KEY;
 	else if (key->flags & I915_SET_COLORKEY_SOURCE)
 		dvscntr |= DVS_SOURCE_KEY;
 
+	return dvscntr;
+}
+
+static void
+ilk_update_plane(struct drm_plane *plane,
+		 const struct intel_crtc_state *crtc_state,
+		 const struct intel_plane_state *plane_state)
+{
+	struct drm_device *dev = plane->dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct intel_plane *intel_plane = to_intel_plane(plane);
+	struct drm_framebuffer *fb = plane_state->base.fb;
+	int pipe = intel_plane->pipe;
+	u32 dvscntr, dvsscale;
+	u32 dvssurf_offset, linear_offset;
+	unsigned int rotation = plane_state->base.rotation;
+	const struct drm_intel_sprite_colorkey *key = &plane_state->ckey;
+	int crtc_x = plane_state->base.dst.x1;
+	int crtc_y = plane_state->base.dst.y1;
+	uint32_t crtc_w = drm_rect_width(&plane_state->base.dst);
+	uint32_t crtc_h = drm_rect_height(&plane_state->base.dst);
+	uint32_t x = plane_state->base.src.x1 >> 16;
+	uint32_t y = plane_state->base.src.y1 >> 16;
+	uint32_t src_w = drm_rect_width(&plane_state->base.src) >> 16;
+	uint32_t src_h = drm_rect_height(&plane_state->base.src) >> 16;
+	unsigned long irqflags;
+
+	dvscntr = ilk_sprite_ctl(crtc_state, plane_state);
+
 	/* Sizes are 0 based */
 	src_w--;
 	src_h--;