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drm/sun4i: Add TODO comment about supporting scaling with the backend 

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.kocialkowski@bootlin.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181123092515.2511-4-paul.kocialkowski@bootlin.com
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Paul Kocialkowski 2018-11-23 10:24:35 +01:00 committed by Maxime Ripard
parent b79a3a97f6
commit ad25d0736d
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drivers/gpu/drm/sun4i/sun4i_backend.c
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@ -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);
}