drm: Move drm_format_num_planes() to drm_crtc.c

[firefly-linux-kernel-4.4.55.git] / drivers / gpu / drm / drm_crtc.c

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index d3aaeb6ae2362167f360d3a8d1aa846028714fdd..32ab669f4aed0ed56943996969e3ad0dc7bc04b4 100644 (file)
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -3466,3 +3466,35 @@ void drm_fb_get_bpp_depth(uint32_t format, unsigned int *depth,
        }
 }
 EXPORT_SYMBOL(drm_fb_get_bpp_depth);
+
+/**
+ * drm_format_num_planes - get the number of planes for format
+ * @format: pixel format (DRM_FORMAT_*)
+ *
+ * RETURNS:
+ * The number of planes used by the specified pixel format.
+ */
+int drm_format_num_planes(uint32_t format)
+{
+       switch (format) {
+       case DRM_FORMAT_YUV410:
+       case DRM_FORMAT_YVU410:
+       case DRM_FORMAT_YUV411:
+       case DRM_FORMAT_YVU411:
+       case DRM_FORMAT_YUV420:
+       case DRM_FORMAT_YVU420:
+       case DRM_FORMAT_YUV422:
+       case DRM_FORMAT_YVU422:
+       case DRM_FORMAT_YUV444:
+       case DRM_FORMAT_YVU444:
+               return 3;
+       case DRM_FORMAT_NV12:
+       case DRM_FORMAT_NV21:
+       case DRM_FORMAT_NV16:
+       case DRM_FORMAT_NV61:
+               return 2;
+       default:
+               return 1;
+       }
+}
+EXPORT_SYMBOL(drm_format_num_planes);