linux-kernel - [PATCH 1/2] drm/vkms: Add zpos property to planes

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Message-Id: <20250801-vkms-fix-zpos-v1-1-d83ba1e6291d@bootlin.com>
Date: Fri, 01 Aug 2025 16:43:48 +0200
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: Haneen Mohammed <hamohammed.sa@...il.com>, 
 Simona Vetter <simona@...ll.ch>, Melissa Wen <melissa.srw@...il.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>
Cc: thomas.petazzoni@...tlin.com, dri-devel@...ts.freedesktop.org, 
 linux-kernel@...r.kernel.org, Louis Chauvet <louis.chauvet@...tlin.com>
Subject: [PATCH 1/2] drm/vkms: Add zpos property to planes

Currently no zpos are defined for vkms planes. This is not yet an
issue, but with the future introduction of configfs, we need to have a way
to properly order plane composition.

In order to make it predictable, add zpos=0 for primary, zpos=1 for
overlays and zpos=2 for cursor. This will be configurable later.

Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
---
 drivers/gpu/drm/vkms/vkms_plane.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
index e3fdd161d0f0a1d20c14a79dbe51c08c8486d12f..44bf9eedf5a7641f2eb171c8995079ca65dfa04e 100644
--- a/drivers/gpu/drm/vkms/vkms_plane.c
+++ b/drivers/gpu/drm/vkms/vkms_plane.c
@@ -232,5 +232,17 @@ struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev,
 					  DRM_COLOR_YCBCR_BT601,
 					  DRM_COLOR_YCBCR_FULL_RANGE);
 
+	switch (type) {
+	case DRM_PLANE_TYPE_PRIMARY:
+		drm_plane_create_zpos_immutable_property(&plane->base, 0);
+		break;
+	case DRM_PLANE_TYPE_OVERLAY:
+		drm_plane_create_zpos_immutable_property(&plane->base, 1);
+		break;
+	case DRM_PLANE_TYPE_CURSOR:
+		drm_plane_create_zpos_immutable_property(&plane->base, 2);
+		break;
+	}
+
 	return plane;
 }

-- 
2.50.1