The backend allows integer-only scaling but can handle alpha components,
unlike the frontend. It could be useful to add support for this
eventually, so add a short TODO comment describing the situation.
Signed-off-by: Paul Kocialkowski <paul.kocialkow...@bootlin.com>
---
drivers/gpu/drm/sun4i/sun4i_backend.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c
b/drivers/gpu/drm/sun4i/sun4i_backend.c
index 67b4bb4f5365..c3444246755b 100644
--- a/drivers/gpu/drm/sun4i/sun4i_backend.c
+++ b/drivers/gpu/drm/sun4i/sun4i_backend.c
@@ -426,6 +426,11 @@ static bool sun4i_backend_plane_uses_frontend(struct
drm_plane_state *state)
if (IS_ERR(backend->frontend))
return false;
+ /*
+ * TODO: The backend alone allows 2x and 4x integer scaling, including
+ * support for an alpha component (which the frontend doesn't support).
+ * Use the backend directly instead of the frontend in this case.
+ */
return sun4i_backend_plane_uses_scaler(state);
}
--
2.19.1
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