kernel/linux.git/include/drm/drm_bridge.h, branch v6.19.11

Revert "drm/atomic-helper: Re-order bridge chain pre-enable and post-disable"

2026-01-03T19:06:54+00:00

This reverts commit c9b1150a68d9362a0827609fc0dc1664c0d8bfe1. Changing the enable/disable sequence has caused regressions on multiple platforms: R-Car, MCDE, Rockchip. A series (see link below) was sent to fix these, but it was decided that it's better to revert the original patch and change the enable/disable sequence only in the tidss driver. Reverting this commit breaks tidss's DSI and OLDI outputs, which will be fixed in the following commits. Signed-off-by: Tomi Valkeinen Link: https://lore.kernel.org/all/20251202-mcde-drm-regression-thirdfix-v6-0-f1bffd4ec0fa%40kernel.org/ Fixes: c9b1150a68d9 ("drm/atomic-helper: Re-order bridge chain pre-enable and post-disable") Cc: stable@vger.kernel.org # v6.17+ Reviewed-by: Aradhya Bhatia Reviewed-by: Maxime Ripard Reviewed-by: Linus Walleij Tested-by: Linus Walleij Signed-off-by: Linus Walleij Link: https://patch.msgid.link/20251205-drm-seq-fix-v1-1-fda68fa1b3de@ideasonboard.com

drm/bridge: get the bridge returned by drm_bridge_get_next_bridge()

2025-09-16T13:22:41+00:00

drm_bridge_get_next_bridge() returns a bridge pointer that the caller could hold for a long time. Increment the refcount of the returned bridge and document it must be put by the caller. Reviewed-by: Maxime Ripard Link: https://lore.kernel.org/r/20250801-drm-bridge-alloc-getput-drm_bridge_get_next_bridge-v2-7-888912b0be13@bootlin.com Signed-off-by: Luca Ceresoli

drm/bridge: add drm_for_each_bridge_in_chain_from()

2025-09-16T13:02:50+00:00

Add variant of drm_for_each_bridge_in_chain_scoped() that iterates on the encoder bridge from a given bridge until the end of the chain. Reviewed-by: Maxime Ripard Link: https://lore.kernel.org/r/20250808-drm-bridge-alloc-getput-for_each_bridge-v2-8-edb6ee81edf1@bootlin.com Signed-off-by: Luca Ceresoli

drm/bridge: remove drm_for_each_bridge_in_chain()

2025-09-16T13:02:48+00:00

All users have been replaced by drm_for_each_bridge_in_chain_scoped(). Reviewed-by: Maxime Ripard Link: https://lore.kernel.org/r/20250808-drm-bridge-alloc-getput-for_each_bridge-v2-7-edb6ee81edf1@bootlin.com Signed-off-by: Luca Ceresoli

drm/bridge: add drm_for_each_bridge_in_chain_scoped()

2025-09-16T13:02:13+00:00

drm_for_each_bridge_in_chain() iterates ofer the bridges in an encoder chain without protecting the lifetime of the bridges using drm_bridge_get/put(). This creates a risk window where the bridge could be freed while iterating on it. Users of drm_for_each_bridge_in_chain() cannot solve this reliably. Add variant of drm_for_each_bridge_in_chain() that gets/puts the bridge reference at the beginning/end of each iteration, and puts it if breaking ot of the loop. Note that this requires adding a new drm_bridge_get_next_bridge_and_put() function because, unlike similar functions as __of_get_next_child(), drm_bridge_get_next_bridge() gets the "next" pointer but does not put the "prev" pointer. Unfortunately drm_bridge_get_next_bridge() cannot be modified to put the "prev" pointer because some of its users rely on this, such as drm_atomic_bridge_propagate_bus_flags(). Also deprecate drm_for_each_bridge_in_chain(), in preparation for removing it after converting all users to the scoped version. Reviewed-by: Maxime Ripard Link: https://lore.kernel.org/r/20250808-drm-bridge-alloc-getput-for_each_bridge-v2-3-edb6ee81edf1@bootlin.com Signed-off-by: Luca Ceresoli

drm/bridge: add drm_bridge_is_last()

2025-09-02T09:38:29+00:00

Some code needing to know whether a bridge is the last in a chain currently call drm_bridge_get_next_bridge(). However drm_bridge_get_next_bridge() will soon increment the refcount of the returned bridge, which would make such code more annoying to write. In preparation for drm_bridge_get_next_bridge() to increment the refcount, as well as to simplify such code, introduce a simple bool function to tell whether a bridge is the last in the chain. Reviewed-by: Maxime Ripard Link: https://lore.kernel.org/r/20250801-drm-bridge-alloc-getput-drm_bridge_get_next_bridge-v2-5-888912b0be13@bootlin.com Signed-off-by: Luca Ceresoli

drm/bridge: add drm_bridge_chain_get_last_bridge()

2025-09-02T09:38:29+00:00

Add an equivalent of drm_bridge_chain_get_first_bridge() to get the last bridge. Reviewed-by: Maxime Ripard Link: https://lore.kernel.org/r/20250801-drm-bridge-alloc-getput-drm_bridge_get_next_bridge-v2-2-888912b0be13@bootlin.com Signed-off-by: Luca Ceresoli

drm_bridge: register content protect property

2025-08-20T15:21:40+00:00

Some bridges can update HDCP status based on userspace requests if they support HDCP. The HDCP property is created after connector initialization and before registration, just like other connector properties. Add the content protection property to the connector if a bridge supports HDCP. Signed-off-by: Hsin-Yi Wang Reviewed-by: Sean Paul Signed-off-by: Fei Shao Signed-off-by: Douglas Anderson Link: https://lore.kernel.org/r/20250812082135.3351172-2-fshao@chromium.org

Merge tag 'drm-misc-next-2025-08-14' of https://gitlab.freedesktop.org/drm/misc/kernel into drm-next

2025-08-18T21:02:30+00:00

drm-misc-next for v6.18: UAPI Changes: - Add DRM_IOCTL_GEM_CHANGE_HANDLE for reassigning GEM handles - Document DRM_MODE_PAGE_FLIP_EVENT Cross-subsystem Changes: fbcon: - Add missing declarations in fbcon.h Core Changes: bridge: - Fix ref counting panel: - Replace and remove mipi_dsi_generic_write_{seq/_chatty}() sched: - Fixes Rust: - Drop Opaque<> from ioctl arguments Driver Changes: amdxdma: - Support buffers allocated by user space - Streamline PM interfaces - Fixes bridge: - cdns-dsi: Various improvements to mode setting - Support Solomon SSD2825 plus DT bindings - Support Waveshare DSI2DPI plus DT bindings gud: - Fixes ivpu: - Fixes nouveau: - Use GSP firmware by default - Fixes panel: - panel-edp: Support mt8189 Chromebooks; Support BOE NV140WUM-N64; Support SHP LQ134Z1; Fixes - panel-simple: Support Olimex LCD-OLinuXino-5CTS plus DT bindings - Support Samsung AMS561RA01 - Support Hydis HV101HD1 plus DT bindings panthor: - Print task/pid on errors - Fixes renesas: - convert to RUNTIME_PM_OPS repaper: - Use shadow-plane helpers rocket: - Add driver for Rockchip NPU plus DT bindings sharp-memory: - Use shadow-plane helpers simpledrm: - Use of_reserved_mem_region_to_resource() helper tidss: - Use crtc_ fields for programming display mode - Remove other drivers from aperture v3d: - Support querying nubmer of GPU resets for KHR_robustness vmwgfx: - Fixes Signed-off-by: Dave Airlie From: Thomas Zimmermann Link: https://lore.kernel.org/r/20250814072454.GA18104@linux.fritz.box

drm/bridge: document HDMI CEC callbacks

2025-08-05T10:50:19+00:00

Provide documentation for the drm_bridge callbacks related to the DRM_BRIDGE_OP_HDMI_CEC_ADAPTER flag. Fixes: a74288c8ded7 ("drm/display: bridge-connector: handle CEC adapters") Reported-by: Stephen Rothwell Closes: https://lore.kernel.org/r/20250611140933.1429a1b8@canb.auug.org.au Reviewed-by: Neil Armstrong Link: https://lore.kernel.org/r/20250801-drm-hdmi-cec-docs-v1-1-be63e6008d0e@oss.qualcomm.com Signed-off-by: Dmitry Baryshkov