[PATCH 16/31] drm/vc4: UV planes vertical scaling must 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.stevenson at 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