linux-kernel - [PATCH] drm/tegra: dc: cap non-cursor plane zpos to 254

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Date:   Wed, 24 May 2023 22:54:46 +0200
From:   Emmanuel Gil Peyrot <linkmauve@...kmauve.fr>
To:     Thierry Reding <thierry.reding@...il.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Jonathan Hunter <jonathanh@...dia.com>,
        dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, Azkali Manad <a.ffcc7@...il.com>
Cc:     Emmanuel Gil Peyrot <linkmauve@...kmauve.fr>
Subject: [PATCH] drm/tegra: dc: cap non-cursor plane zpos to 254

Since cursor plane has the immutable zpos 255, other planes can’t take
its place so we can cap them to 254 instead.

Thanks emersion!

Signed-off-by: Emmanuel Gil Peyrot <linkmauve@...kmauve.fr>
---
 drivers/gpu/drm/tegra/dc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index 6e78416e64b0..e9a416fb4db7 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -838,7 +838,7 @@ static struct drm_plane *tegra_primary_plane_create(struct drm_device *drm,
 	}
 
 	drm_plane_helper_add(&plane->base, &tegra_plane_helper_funcs);
-	drm_plane_create_zpos_property(&plane->base, plane->index, 0, 255);
+	drm_plane_create_zpos_property(&plane->base, plane->index, 0, 254);
 
 	err = drm_plane_create_rotation_property(&plane->base,
 						 DRM_MODE_ROTATE_0,
@@ -1292,7 +1292,7 @@ static struct drm_plane *tegra_dc_overlay_plane_create(struct drm_device *drm,
 	}
 
 	drm_plane_helper_add(&plane->base, &tegra_plane_helper_funcs);
-	drm_plane_create_zpos_property(&plane->base, plane->index, 0, 255);
+	drm_plane_create_zpos_property(&plane->base, plane->index, 0, 254);
 
 	err = drm_plane_create_rotation_property(&plane->base,
 						 DRM_MODE_ROTATE_0,
-- 
2.40.1