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bh=kpXfKOvR3np/sIO/bcw5rLSmNmCzh2OkzuwODBfBSCs=; b=ndG8cFwi4OvHrdGhfS6oTekIINOSMhMMJc0IvQBdV5wcq5mE4cXAwZtuYMFvrjJNXIKJR+ 9Cp118556v0j2R+3UQyGB3Kmief67FHcsCpElkiOH5Dif3KuVLogPhgOowFAffGWNk2I48 37+HupFaKDXdnAizp9YN4HL8l59UW3FaTiIuY2ZSRQgxPNbmMjq8euFUPxhDMNZ6dK+6CB aahmxJO4mYdQcDAKxLI4HDCnz0COlAyeb6yycqed3yEpLweRehEiVPki+7KscV/NpxU5FK VlV5J8LMOUbcIaMKUVJ8MWWJw01mhkXKALWJvW4/nH7/w8IAY7CLtxPvwkPwoA== From: Luca Ceresoli Subject: [PATCH 00/10] drm/bridge: handle refcounting for bridge-only callers of drm_of_find_panel_or_bridge() Date: Mon, 13 Apr 2026 15:58:32 +0200 Message-Id: <20260413-drm-bridge-alloc-getput-panel_or_bridge-v1-0-acd01cd79a1f@bootlin.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-B4-Tracking: v=1; b=H4sIAIj23GkC/y2NWwrCMBAAr1L220CSVhGvIlLyWOtKTMImFaH07 o3Vz2FgZoGCTFjg0i3A+KZCKTZQhw7cw8QJBfnGoKU+yUFJ4fklLJNvxoSQnJiw5rmKbCKGMfH 4l4M+SmX7MxrjodUy450+++l6+3GZ7RNd/eZhXTcyVXZEiwAAAA== X-Change-ID: 20260410-drm-bridge-alloc-getput-panel_or_bridge-42501b38eaad To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Clark , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , Xinliang Liu , Tian Tao , Xinwei Kong , Sumit Semwal , Yongqin Liu , John Stultz , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Tomi Valkeinen , Michal Simek Cc: Hui Pu , Ian Ray , Thomas Petazzoni , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, Luca Ceresoli X-Mailer: b4 0.15.1 X-Last-TLS-Session-Version: TLSv1.3 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260413_065853_869949_268062C6 X-CRM114-Status: GOOD ( 10.29 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This series converts all the bridge-only callers of the deprecated drm_of_find_panel_or_bridge() API to a new, simpler API that handles bridge refcounting. == Series description * The first patch introduces of_drm_get_bridge_by_endpoint() as a replacement for bridge-only calls to drm_of_find_panel_or_bridge(); the new function is simpler and returns a refcounted bridge * The following patches convert all bridge-only users to the new API * The last patch forbids new bridge-only calls to drm_of_find_panel_or_bridge() == Grand plan This is part of the work to support hotplug of DRM bridges. The grand plan was discussed in [0]. Here's the work breakdown (➜ marks the current series): 1. ➜ add refcounting to DRM bridges struct drm_bridge, based on devm_drm_bridge_alloc() A. ✔ add new alloc API and refcounting (v6.16) B. ✔ convert all bridge drivers to new API (v6.17) C. ✔ kunit tests (v6.17) D. ✔ add get/put to drm_bridge_add/remove() + attach/detach() and warn on old allocation pattern (v6.17) E. ➜ add get/put on drm_bridge accessors 1. ✔ drm_bridge_chain_get_first_bridge(), add cleanup action (v6.18) 2. ✔ drm_bridge_get_prev_bridge() (v6.18) 3. ✔ drm_bridge_get_next_bridge() (v6.19) 4. ✔ drm_for_each_bridge_in_chain() (v6.19) 5. ✔ drm_bridge_connector_init (v6.19) 6. … protect encoder bridge chain with a mutex 7. ➜ of_drm_find_bridge a. ✔ add of_drm_get_bridge() (v7.0), convert basic direct users (v7.0-v7.1) b. ✔ convert direct of_drm_get_bridge() users, part 2 (v7.0) c. ✔ convert direct of_drm_get_bridge() users, part 3 (v7.0) d. ✔… convert direct of_drm_get_bridge() users, part 4 (some v7.1, some pending) e. ➜ convert bridge-only drm_of_find_panel_or_bridge() users 8. drm_of_find_panel_or_bridge, *_of_get_bridge 9. ✔ enforce drm_bridge_add before drm_bridge_attach (v6.19) F. ✔ debugfs improvements 1. ✔ add top-level 'bridges' file (v6.16) 2. ✔ show refcount and list lingering bridges (v6.19) 2. … handle gracefully atomic updates during bridge removal A. ✔ Add drm_bridge_enter/exit() to protect device resources (v7.0) B. … protect private_obj removal from list C. ✔ Add drm_bridge_clear_and_put() (v7.1) 3. … DSI host-device driver interaction 4. ✔ removing the need for the "always-disconnected" connector 5. … Migrate i.MX LCDIF driver to bridge-connector 6. DRM bridge hotplug A. Bridge hotplug management in the DRM core B. Device tree description [0] https://lore.kernel.org/lkml/20250206-hotplug-drm-bridge-v6-0-9d6f2c9c3058@bootlin.com/#t Signed-off-by: Luca Ceresoli --- Luca Ceresoli (10): drm/bridge: add of_drm_get_bridge_by_endpoint() drm/msm/hdmi: switch to of_drm_get_bridge_by_endpoint() drm/hisilicon/kirin: switch to of_drm_get_bridge_by_endpoint() drm/bridge: chrontel-ch7033: switch to of_drm_get_bridge_by_endpoint() drm/bridge: lontium-lt9611uxc: switch to of_drm_get_bridge_by_endpoint() drm/bridge: lt9611: switch to of_drm_get_bridge_by_endpoint() drm/bridge: adv7511: switch to of_drm_get_bridge_by_endpoint() drm/bridge: lt8713sx: switch to of_drm_get_bridge_by_endpoint() drm: zynqmp_dp: switch to of_drm_get_bridge_by_endpoint() drm: of: forbid bridge-only calls to drm_of_find_panel_or_bridge() drivers/gpu/drm/bridge/adv7511/adv7511.h | 1 - drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 8 ++--- drivers/gpu/drm/bridge/chrontel-ch7033.c | 24 +++++++-------- drivers/gpu/drm/bridge/lontium-lt8713sx.c | 7 ++--- drivers/gpu/drm/bridge/lontium-lt9611.c | 5 ++- drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 5 ++- drivers/gpu/drm/drm_bridge.c | 46 ++++++++++++++++++++++++++++ drivers/gpu/drm/drm_of.c | 26 ++++++++-------- drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c | 4 +-- drivers/gpu/drm/msm/hdmi/hdmi.c | 3 +- drivers/gpu/drm/xlnx/zynqmp_dp.c | 10 +++--- include/drm/drm_bridge.h | 9 ++++++ 12 files changed, 97 insertions(+), 51 deletions(-) --- base-commit: f9ef69563cc82e908e1ce84fd135d3290fb65cde change-id: 20260410-drm-bridge-alloc-getput-panel_or_bridge-42501b38eaad Best regards, -- Luca Ceresoli