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authorPaul Kocialkowski <paul.kocialkowski@bootlin.com>2018-11-23 12:24:35 +0300
committerMaxime Ripard <maxime.ripard@bootlin.com>2018-11-27 11:30:59 +0300
commitad25d0736db00afb2c7bf355bc50437434325387 (patch)
tree2272692c611abd1f51b0554d6615ae109bb49698 /drivers/gpu/drm/sun4i/sun4i_backend.c
parentb79a3a97f64f90dac79a9fc57a0280607306ba38 (diff)
downloadlinux-ad25d0736db00afb2c7bf355bc50437434325387.tar.xz
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
Diffstat (limited to 'drivers/gpu/drm/sun4i/sun4i_backend.c')
-rw-r--r--drivers/gpu/drm/sun4i/sun4i_backend.c5
1 files changed, 5 insertions, 0 deletions
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);
}