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-rw-r--r--include/uapi/drm/drm_mode.h13
1 files changed, 8 insertions, 5 deletions
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index ebf622f5b238..728790b92354 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -408,17 +408,20 @@ struct drm_mode_fb_cmd2 {
* offsets[1]. Note that offsets[0] will generally
* be 0 (but this is not required).
*
- * To accommodate tiled, compressed, etc formats, a per-plane
+ * To accommodate tiled, compressed, etc formats, a
* modifier can be specified. The default value of zero
* indicates "native" format as specified by the fourcc.
- * Vendor specific modifier token. This allows, for example,
- * different tiling/swizzling pattern on different planes.
- * See discussion above of DRM_FORMAT_MOD_xxx.
+ * Vendor specific modifier token. Note that even though
+ * it looks like we have a modifier per-plane, we in fact
+ * do not. The modifier for each plane must be identical.
+ * Thus all combinations of different data layouts for
+ * multi plane formats must be enumerated as separate
+ * modifiers.
*/
__u32 handles[4];
__u32 pitches[4]; /* pitch for each plane */
__u32 offsets[4]; /* offset of each plane */
- __u64 modifier[4]; /* ie, tiling, compressed (per plane) */
+ __u64 modifier[4]; /* ie, tiling, compress */
};
#define DRM_MODE_FB_DIRTY_ANNOTATE_COPY 0x01