drm/i915: Use primary plane->state for overlay ckey setup

Extract the primary plane pixel format via plane state when setting up
the overlay colorkey.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1481131693-27993-10-git-send-email-ville.syrjala@linux.intel.comReviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/intel_overlay.c

@@ -690,31 +690,32 @@ static bool update_scaling_factors(struct intel_overlay *overlay,
 static void update_colorkey(struct intel_overlay *overlay,
 			    struct overlay_registers __iomem *regs)
 {
+	const struct intel_plane_state *state =
+		to_intel_plane_state(overlay->crtc->base.primary->state);
 	u32 key = overlay->color_key;
-	u32 flags;
+	u32 format = 0;
+	u32 flags = 0;
 
-	flags = 0;
 	if (overlay->color_key_enabled)
 		flags |= DST_KEY_ENABLE;
 
-	switch (overlay->crtc->base.primary->fb->bits_per_pixel) {
-	case 8:
+	if (state->base.visible)
+		format = state->base.fb->pixel_format;
+
+	switch (format) {
+	case DRM_FORMAT_C8:
 		key = 0;
 		flags |= CLK_RGB8I_MASK;
 		break;
-
-	case 16:
-		if (overlay->crtc->base.primary->fb->depth == 15) {
+	case DRM_FORMAT_XRGB1555:
 		key = RGB15_TO_COLORKEY(key);
 		flags |= CLK_RGB15_MASK;
-		} else {
+		break;
+	case DRM_FORMAT_RGB565:
 		key = RGB16_TO_COLORKEY(key);
 		flags |= CLK_RGB16_MASK;
-		}
 		break;
-
-	case 24:
-	case 32:
+	default:
 		flags |= CLK_RGB24_MASK;
 		break;
 	}