linux-kernel - [PATCH 0/3] drm/exynos: KMS cleanups for off-screen planes and mode

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Message-ID: <20250929043110.3631025-1-hy_fifty.lee@samsung.com>
Date: Mon, 29 Sep 2025 13:31:07 +0900
From: Hoyoung Lee <hy_fifty.lee@...sung.com>
To: Inki Dae <inki.dae@...sung.com>, Seung-Woo Kim <sw0312.kim@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>, David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>, Krzysztof Kozlowski <krzk@...nel.org>, Alim
	Akhtar <alim.akhtar@...sung.com>
Cc: Hoyoung Lee <hy_fifty.lee@...sung.com>, dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/3] drm/exynos: KMS cleanups for off-screen planes and
 mode_config

Hi all,

This small series makes Exynos KMS a bit more robust and better aligned
with common DRM layering:

- Patch 1 treats fully off-screen planes as not visible and routes them
through the explicit disable path instead of programming zero-sized
dimensions in ->atomic_update(). This ensures the proper disable
semantics run when a plane contributes nothing to the frame, and avoids
keeping a logically enabled window around.

- Patch 2 converts mode-config initialization to
drmm_mode_config_init(), tying the lifetime to drm_device and dropping
the now-unnecessary manual drm_mode_config_cleanup() in error/unbind
paths.

- Patch 3 moves the device-wide mode_config setup (funcs/helpers and
limits) from exynos_drm_fb.c to exynos_drm_drv.c and calls
drm_mode_config_init() from inside exynos_drm_mode_config_init().
Historically Exynos put this in fb.c when the driver grew around fbdev
helpers; today it obscures ownership and ordering. Placing it in drv.c
matches other vendors, makes the init order explicit (before creating
CRTC/planes/connectors and binding components), and centralizes device-
level policy in the core driver.

No userspace ABI changes. Comments and reviews are very welcome.

Thanks,
Hoyoung Lee.

Hoyoung Lee (3):
  drm/exynos: plane: Disable fully off-screen planes instead of
    zero-sized update
  drm/exynos: Convert to drmm_mode_config_init() and drop manual cleanup
  drm/exynos: Move mode_config setup from fb.c to drv.c

 drivers/gpu/drm/exynos/exynos_drm_drv.c   | 49 +++++++++++++++++++----
 drivers/gpu/drm/exynos/exynos_drm_fb.c    | 34 +---------------
 drivers/gpu/drm/exynos/exynos_drm_fb.h    |  7 +++-
 drivers/gpu/drm/exynos/exynos_drm_plane.c | 12 +++++-
 4 files changed, 60 insertions(+), 42 deletions(-)

--
2.34.1