drm/i915: fix color order for BGR formats on SNB

Had the wrong bits and field definitions.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Keith Packard <keithp@keithp.com>

drivers/gpu/drm/i915/i915_reg.h

@@ -2689,7 +2689,7 @@
 #define   DVS_FORMAT_RGBX888	(2<<25)
 #define   DVS_FORMAT_RGBX161616	(3<<25)
 #define   DVS_SOURCE_KEY	(1<<22)
-#define   DVS_RGB_ORDER_RGBX	(1<<20)
+#define   DVS_RGB_ORDER_XBGR	(1<<20)
 #define   DVS_YUV_BYTE_ORDER_MASK (3<<16)
 #define   DVS_YUV_ORDER_YUYV	(0<<16)
 #define   DVS_YUV_ORDER_UYVY	(1<<16)

drivers/gpu/drm/i915/intel_sprite.c

@@ -225,16 +225,16 @@ snb_update_plane(struct drm_plane *plane, struct drm_framebuffer *fb,
 
 	/* Mask out pixel format bits in case we change it */
 	dvscntr &= ~DVS_PIXFORMAT_MASK;
-	dvscntr &= ~DVS_RGB_ORDER_RGBX;
+	dvscntr &= ~DVS_RGB_ORDER_XBGR;
 	dvscntr &= ~DVS_YUV_BYTE_ORDER_MASK;
 
 	switch (fb->pixel_format) {
 	case DRM_FORMAT_XBGR8888:
-		dvscntr |= DVS_FORMAT_RGBX888;
+		dvscntr |= DVS_FORMAT_RGBX888 | DVS_RGB_ORDER_XBGR;
 		pixel_size = 4;
 		break;
 	case DRM_FORMAT_XRGB8888:
-		dvscntr |= DVS_FORMAT_RGBX888 | DVS_RGB_ORDER_RGBX;
+		dvscntr |= DVS_FORMAT_RGBX888;
 		pixel_size = 4;
 		break;
 	case DRM_FORMAT_YUYV: