[PATCH v2 15/31] drm/vc4: plane: YUV planes require vertical scaling to always be enabled

[Dave Stevenson]

It has been observed that a YUV422 unity scaled plane isn't displayed.
Enabling vertical scaling on the UV planes solves this. There is
already a similar clause to always enable horizontal scaling on the
UV planes.

Signed-off-by: Dave Stevenson <dave.steven...@raspberrypi.com>
---
 drivers/gpu/drm/vc4/vc4_plane.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
index d078a2d21eea..4cd1721d2389 100644
--- a/drivers/gpu/drm/vc4/vc4_plane.c
+++ b/drivers/gpu/drm/vc4/vc4_plane.c
@@ -517,6 +517,12 @@ static int vc4_plane_setup_clipping_and_scaling(struct 
drm_plane_state *state)
                 */
                if (vc4_state->x_scaling[1] == VC4_SCALING_NONE)
                        vc4_state->x_scaling[1] = VC4_SCALING_PPF;
+
+               /* Similarly UV needs vertical scaling to be enabled.
+                * Without this a 1:1 scaled YUV422 plane isn't rendered.
+                */
+               if (vc4_state->y_scaling[1] == VC4_SCALING_NONE)
+                       vc4_state->y_scaling[1] = VC4_SCALING_PPF;
        } else {
                vc4_state->is_yuv = false;
                vc4_state->x_scaling[1] = VC4_SCALING_NONE;
-- 
2.34.1