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From 03e0e348df7b685439f2db61ec2d8c8da25d1217 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Wed, 23 Aug 2023 17:48:23 +0100
Subject: [PATCH] drm/vc4: UV planes vertical scaling must always be enabled
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@raspberrypi.com>
---
drivers/gpu/drm/vc4/vc4_plane.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/gpu/drm/vc4/vc4_plane.c
+++ b/drivers/gpu/drm/vc4/vc4_plane.c
@@ -522,6 +522,12 @@ static int vc4_plane_setup_clipping_and_
*/
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;
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