drm: Add drm_format_plane_cpp() utility function

[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 32ab669f4aed0ed56943996969e3ad0dc7bc04b4..2c4e9cf2a1d20acfbfecc89dd9f5d625667e002a 100644 (file)
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -3498,3 +3498,48 @@ int drm_format_num_planes(uint32_t format)
        }
 }
 EXPORT_SYMBOL(drm_format_num_planes);
+
+/**
+ * drm_format_plane_cpp - determine the bytes per pixel value
+ * @format: pixel format (DRM_FORMAT_*)
+ * @plane: plane index
+ *
+ * RETURNS:
+ * The bytes per pixel value for the specified plane.
+ */
+int drm_format_plane_cpp(uint32_t format, int plane)
+{
+       unsigned int depth;
+       int bpp;
+
+       if (plane >= drm_format_num_planes(format))
+               return 0;
+
+       switch (format) {
+       case DRM_FORMAT_YUYV:
+       case DRM_FORMAT_YVYU:
+       case DRM_FORMAT_UYVY:
+       case DRM_FORMAT_VYUY:
+               return 2;
+       case DRM_FORMAT_NV12:
+       case DRM_FORMAT_NV21:
+       case DRM_FORMAT_NV16:
+       case DRM_FORMAT_NV61:
+               return plane ? 2 : 1;
+       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 1;
+       default:
+               drm_fb_get_bpp_depth(format, &depth, &bpp);
+               return bpp >> 3;
+       }
+}
+EXPORT_SYMBOL(drm_format_plane_cpp);