linux-kernel - [PATCH 0/2] drm/vkms: Fix plane blending z-order

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Message-Id: <20250801-vkms-fix-zpos-v1-0-d83ba1e6291d@bootlin.com>
Date: Fri, 01 Aug 2025 16:43:47 +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 0/2] drm/vkms: Fix plane blending z-order

As reported by Marius [1], the current blending algorithm for vkms planes 
is not future-proof. Currently the z-ordering is only garanteed by the 
creation order. As the future ConfigFS interface will allows to create 
planes, this order may vary.

To avoid this, add the zpos property and blend the planes according to 
this zpos order.

[1]:https://lore.kernel.org/all/aHpGGxZyimpJ8Ehz@xpredator/

Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
---
Louis Chauvet (2):
      drm/vkms: Add zpos property to planes
      drm/vkms: Properly order plane for blending

 drivers/gpu/drm/vkms/vkms_crtc.c  | 26 ++++++++++++++++++++------
 drivers/gpu/drm/vkms/vkms_drv.c   |  1 +
 drivers/gpu/drm/vkms/vkms_plane.c | 12 ++++++++++++
 3 files changed, 33 insertions(+), 6 deletions(-)
---
base-commit: 82928cc1c2b2be16ea6ee9e23799ca182e1cd37c
change-id: 20250801-vkms-fix-zpos-1dc6a3f51a50

Best regards,
-- 
Louis Chauvet <louis.chauvet@...tlin.com>