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-rw-r--r--drivers/gpu/drm/vc4/vc4_vec.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vc4/vc4_vec.c b/drivers/gpu/drm/vc4/vc4_vec.c
index 32bb8ef985fb..09c1e05765fa 100644
--- a/drivers/gpu/drm/vc4/vc4_vec.c
+++ b/drivers/gpu/drm/vc4/vc4_vec.c
@@ -16,6 +16,12 @@
/**
* DOC: VC4 SDTV module
+ *
+ * The VEC encoder generates PAL or NTSC composite video output.
+ *
+ * TV mode selection is done by an atomic property on the encoder,
+ * because a drm_mode_modeinfo is insufficient to distinguish between
+ * PAL and PAL-M or NTSC and NTSC-J.
*/
#include <drm/drm_atomic_helper.h>