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Message-Id: <20250509-drm-bridge-convert-to-alloc-api-v3-0-b8bc1f16d7aa@bootlin.com>
Date: Fri, 09 May 2025 15:53:26 +0200
From: Luca Ceresoli <luca.ceresoli@...tlin.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
Andrzej Hajda <andrzej.hajda@...el.com>,
Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>,
Jagan Teki <jagan@...rulasolutions.com>, Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>,
Douglas Anderson <dianders@...omium.org>,
Chun-Kuang Hu <chunkuang.hu@...nel.org>,
Krzysztof Kozlowski <krzk@...nel.org>
Cc: Anusha Srivatsa <asrivats@...hat.com>,
Paul Kocialkowski <paulk@...-base.io>, Dmitry Baryshkov <lumag@...nel.org>,
Hui Pu <Hui.Pu@...ealthcare.com>,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
dri-devel@...ts.freedesktop.org, asahi@...ts.linux.dev,
linux-kernel@...r.kernel.org, chrome-platform@...ts.linux.dev,
imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org, linux-amlogic@...ts.infradead.org,
linux-renesas-soc@...r.kernel.org, platform-driver-x86@...r.kernel.org,
linux-samsung-soc@...r.kernel.org, linux-arm-msm@...r.kernel.org,
freedreno@...ts.freedesktop.org, linux-stm32@...md-mailman.stormreply.com,
Luca Ceresoli <luca.ceresoli@...tlin.com>,
Louis Chauvet <louis.chauvet@...tlin.com>,
Alim Akhtar <alim.akhtar@...sung.com>, Inki Dae <inki.dae@...sung.com>,
Kyungmin Park <kyungmin.park@...sung.com>,
Seung-Woo Kim <sw0312.kim@...sung.com>,
Manikandan Muralidharan <manikandan.m@...rochip.com>,
Adam Ford <aford173@...il.com>, Adrien Grassein <adrien.grassein@...il.com>,
Aleksandr Mishin <amishin@...rgos.ru>, Andy Yan <andy.yan@...k-chips.com>,
AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
Benson Leung <bleung@...omium.org>, Biju Das <biju.das.jz@...renesas.com>,
Christoph Fritz <chf.fritz@...glemail.com>,
Cristian Ciocaltea <cristian.ciocaltea@...labora.com>,
Detlev Casanova <detlev.casanova@...labora.com>,
Dharma Balasubiramani <dharma.b@...rochip.com>,
Guenter Roeck <groeck@...omium.org>, Heiko Stuebner <heiko@...ech.de>,
Jani Nikula <jani.nikula@...el.com>, Janne Grunau <j@...nau.net>,
Jerome Brunet <jbrunet@...libre.com>, Jesse Van Gavere <jesseevg@...il.com>,
Kevin Hilman <khilman@...libre.com>,
Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
Liu Ying <victor.liu@....com>,
Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
Matthias Brugger <matthias.bgg@...il.com>,
Philipp Zabel <p.zabel@...gutronix.de>, Phong LE <ple@...libre.com>,
Sasha Finkelstein <fnkl.kernel@...il.com>,
Sugar Zhang <sugar.zhang@...k-chips.com>,
Sui Jingfeng <sui.jingfeng@...ux.dev>,
Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>,
Vitalii Mordan <mordan@...ras.ru>, "Rob Herring (Arm)" <robh@...nel.org>,
Hsin-Te Yuan <yuanhsinte@...omium.org>,
Pin-yen Lin <treapking@...omium.org>, Xin Ji <xji@...logixsemi.com>,
Aradhya Bhatia <a-bhatia1@...com>,
Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
Ian Ray <ian.ray@...ealthcare.com>,
Martyn Welch <martyn.welch@...labora.co.uk>,
Peter Senna Tschudin <peter.senna@...il.com>, Helge Deller <deller@....de>,
Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Philippe Cornu <philippe.cornu@...s.st.com>,
Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com>,
Yannick Fertre <yannick.fertre@...s.st.com>,
Alain Volmat <alain.volmat@...s.st.com>,
Raphael Gallais-Pou <rgallaispou@...il.com>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Michal Simek <michal.simek@....com>, Jonathan Corbet <corbet@....net>,
linux-doc@...r.kernel.org
Subject: [PATCH v3 00/22] drm: convert all bridges to
devm_drm_bridge_alloc()
devm_drm_bridge_alloc() [0] is the new API to allocate and initialize a DRM
bridge, and the only one supported from now on. It is the first milestone
towards removal of bridges from a still existing DRM pipeline without
use-after-free.
The steps in the grand plan [1] are:
1. ➜ add refcounting to DRM bridges (struct drm_bridge)
2. handle gracefully atomic updates during bridge removal
3. avoid DSI host drivers to have dangling pointers to DSI devices
4. finish the hotplug bridge work, removing the "always-disconnected"
connector, moving code to the core and potentially removing the
hotplug-bridge itself (this needs to be clarified as points 1-3 are
developed)
This series is part of step 1 of the grand plan.
Current tasks in step 1 of the grand plan:
A. ✔ add new alloc API and refcounting -> (now in drm-misc-next)
B. ➜ convert all bridge drivers to new API (this series)
C. … documentation, kunit tests (v1 under discussion)
D. after (B), add get/put to drm_bridge_add/remove() + attach/detech()
E. after (B), convert accessors; this is a large work and can be done
in chunks
F. debugfs improvements
More info about this series in the v2 cover [2].
Luca
[0] https://gitlab.freedesktop.org/drm/misc/kernel/-/commit/0cc6aadd7fc1e629b715ea3d1ba537ef2da95eec
[1] https://lore.kernel.org/lkml/20250206-hotplug-drm-bridge-v6-0-9d6f2c9c3058@bootlin.com/t/#u
[2] https://lore.kernel.org/lkml/20250424-drm-bridge-convert-to-alloc-api-v2-0-8f91a404d86b@bootlin.com/
Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.com>
---
Changes in v3:
- Fixed issues reported for some patches
- Added review tags
- Removed patches that have been applied
- Added revert for the exynos patch, applied by mistake
- Update cover with grand plan info and trim some of it
- Updated bouncing e-mail address in Cc list
- Link to v2: https://lore.kernel.org/lkml/20250424-drm-bridge-convert-to-alloc-api-v2-0-8f91a404d86b@bootlin.com/
Changes in v2:
- Improved cover letter with link to commit adding devm_drm_bridge_alloc()
- add review tags
- fix bugs in zynqmp, vc4 patches
- fix patch 1 error code checking
- Link to v1: https://lore.kernel.org/r/20250407-drm-bridge-convert-to-alloc-api-v1-0-42113ff8d9c0@bootlin.com
---
Luca Ceresoli (22):
Revert "drm/exynos: mic: convert to devm_drm_bridge_alloc() API"
drm: convert many bridge drivers from devm_kzalloc() to devm_drm_bridge_alloc() API
drm/bridge: anx7625: convert to devm_drm_bridge_alloc() API
drm/bridge: cdns-dsi: convert to devm_drm_bridge_alloc() API
drm/bridge: megachips-stdpxxxx-ge-b850v3-fw: convert to devm_drm_bridge_alloc() API
drm/bridge: nxp-ptn3460: convert to devm_drm_bridge_alloc() API
drm/bridge: sii902x: convert to devm_drm_bridge_alloc() API
drm/omap: dss: dpi: convert to devm_drm_bridge_alloc() API
drm/omap: dss: dsi: convert to devm_drm_bridge_alloc() API
drm/omap: dss: hdmi4: convert to devm_drm_bridge_alloc() API
drm/omap: dss: hdmi5: convert to devm_drm_bridge_alloc() API
drm/omap: dss: sdi: convert to devm_drm_bridge_alloc() API
drm/omap: dss: venc: convert to devm_drm_bridge_alloc() API
drm/rcar-du: dsi: convert to devm_drm_bridge_alloc() API
drm/bridge: stm_lvds: convert to devm_drm_bridge_alloc() API
drm/sti: dvo: convert to devm_drm_bridge_alloc() API
drm: zynqmp_dp: convert to devm_drm_bridge_alloc() API
drm/bridge: imx8qxp-pixel-combiner: convert to devm_drm_bridge_alloc() API
drm/bridge: tc358767: convert to devm_drm_bridge_alloc() API
drm/bridge: add devm_drm_put_bridge()
drm/bridge: panel: convert to devm_drm_bridge_alloc() API
drm/todo: add entry to remove devm_drm_put_bridge()
Documentation/gpu/todo.rst | 15 ++++++
drivers/gpu/drm/adp/adp-mipi.c | 8 ++--
drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 8 ++--
drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c | 9 ++--
drivers/gpu/drm/bridge/analogix/anx7625.c | 7 ++-
drivers/gpu/drm/bridge/aux-bridge.c | 8 ++--
drivers/gpu/drm/bridge/aux-hpd-bridge.c | 9 ++--
drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c | 8 ++--
.../gpu/drm/bridge/cadence/cdns-mhdp8546-core.c | 8 ++--
drivers/gpu/drm/bridge/chipone-icn6211.c | 8 ++--
drivers/gpu/drm/bridge/chrontel-ch7033.c | 8 ++--
drivers/gpu/drm/bridge/cros-ec-anx7688.c | 8 ++--
drivers/gpu/drm/bridge/fsl-ldb.c | 7 ++-
drivers/gpu/drm/bridge/imx/imx-legacy-bridge.c | 8 ++--
drivers/gpu/drm/bridge/imx/imx8mp-hdmi-pvi.c | 8 ++--
.../gpu/drm/bridge/imx/imx8qxp-pixel-combiner.c | 27 ++++++-----
drivers/gpu/drm/bridge/imx/imx8qxp-pixel-link.c | 8 ++--
drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c | 8 ++--
drivers/gpu/drm/bridge/ite-it6263.c | 8 ++--
drivers/gpu/drm/bridge/ite-it6505.c | 8 ++--
drivers/gpu/drm/bridge/ite-it66121.c | 8 ++--
drivers/gpu/drm/bridge/lontium-lt8912b.c | 8 ++--
drivers/gpu/drm/bridge/lontium-lt9211.c | 7 ++-
drivers/gpu/drm/bridge/lontium-lt9611.c | 8 ++--
drivers/gpu/drm/bridge/lvds-codec.c | 9 ++--
.../drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c | 11 ++---
drivers/gpu/drm/bridge/microchip-lvds.c | 8 ++--
drivers/gpu/drm/bridge/nwl-dsi.c | 8 ++--
drivers/gpu/drm/bridge/nxp-ptn3460.c | 9 ++--
drivers/gpu/drm/bridge/panel.c | 12 ++---
drivers/gpu/drm/bridge/parade-ps8622.c | 8 ++--
drivers/gpu/drm/bridge/parade-ps8640.c | 8 ++--
drivers/gpu/drm/bridge/sii902x.c | 7 ++-
drivers/gpu/drm/bridge/sii9234.c | 8 ++--
drivers/gpu/drm/bridge/sil-sii8620.c | 8 ++--
drivers/gpu/drm/bridge/simple-bridge.c | 8 ++--
drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c | 8 ++--
drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 8 ++--
drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi2.c | 8 ++--
drivers/gpu/drm/bridge/tc358762.c | 8 ++--
drivers/gpu/drm/bridge/tc358764.c | 8 ++--
drivers/gpu/drm/bridge/tc358767.c | 56 +++++++++++++++-------
drivers/gpu/drm/bridge/tc358768.c | 8 ++--
drivers/gpu/drm/bridge/tc358775.c | 8 ++--
drivers/gpu/drm/bridge/thc63lvd1024.c | 8 ++--
drivers/gpu/drm/bridge/ti-dlpc3433.c | 8 ++--
drivers/gpu/drm/bridge/ti-tdp158.c | 8 ++--
drivers/gpu/drm/bridge/ti-tfp410.c | 8 ++--
drivers/gpu/drm/bridge/ti-tpd12s015.c | 8 ++--
drivers/gpu/drm/drm_bridge.c | 17 +++++++
drivers/gpu/drm/exynos/exynos_drm_mic.c | 7 +--
drivers/gpu/drm/mediatek/mtk_dp.c | 8 ++--
drivers/gpu/drm/mediatek/mtk_dpi.c | 8 ++--
drivers/gpu/drm/mediatek/mtk_dsi.c | 8 ++--
drivers/gpu/drm/mediatek/mtk_hdmi.c | 8 ++--
drivers/gpu/drm/meson/meson_encoder_cvbs.c | 10 ++--
drivers/gpu/drm/meson/meson_encoder_dsi.c | 10 ++--
drivers/gpu/drm/meson/meson_encoder_hdmi.c | 10 ++--
drivers/gpu/drm/omapdrm/dss/dpi.c | 7 ++-
drivers/gpu/drm/omapdrm/dss/dsi.c | 7 ++-
drivers/gpu/drm/omapdrm/dss/hdmi4.c | 26 ++++------
drivers/gpu/drm/omapdrm/dss/hdmi5.c | 26 ++++------
drivers/gpu/drm/omapdrm/dss/sdi.c | 25 ++++------
drivers/gpu/drm/omapdrm/dss/venc.c | 23 ++++-----
drivers/gpu/drm/renesas/rcar-du/rcar_lvds.c | 8 ++--
drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c | 8 ++--
drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c | 8 ++--
drivers/gpu/drm/sti/sti_dvo.c | 29 +++++------
drivers/gpu/drm/stm/lvds.c | 7 ++-
drivers/gpu/drm/xlnx/zynqmp_dp.c | 31 +++++-------
drivers/gpu/drm/xlnx/zynqmp_dpsub.c | 1 -
include/drm/drm_bridge.h | 4 ++
72 files changed, 390 insertions(+), 379 deletions(-)
---
base-commit: 94c60d3c1079fc044e356a78ffc68ca7b0603039
change-id: 20250404-drm-bridge-convert-to-alloc-api-614becf62294
Best regards,
--
Luca Ceresoli <luca.ceresoli@...tlin.com>
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