kernel/linux.git/drivers/gpu/drm/drm_panel.c, branch linux-7.0.y

drm/panel: Allow powering on panel follower after panel is enabled

2025-08-25T16:17:49+00:00

Some touch controllers have to be powered on after the panel's backlight is enabled. To support these controllers, introduce .panel_enabled() and .panel_disabling() to panel_follower_funcs and use them to power on the device after the panel and its backlight are enabled. Signed-off-by: Pin-yen Lin Reviewed-by: Douglas Anderson Signed-off-by: Douglas Anderson Link: https://lore.kernel.org/r/20250818115015.2909525-1-treapking@chromium.org

drm/panel: Include

2025-06-16T07:02:39+00:00

Fix the compile-time warnings drivers/gpu/drm/drm_panel.c: warning: EXPORT_SYMBOL() is used, but #include is missing drivers/gpu/drm/drm_panel_backlight_quirks.c: warning: EXPORT_SYMBOL() is used, but #include is missing drivers/gpu/drm/drm_panel_orientation_quirks.c: warning: EXPORT_SYMBOL() is used, but #include is missing drivers/gpu/drm/panel/panel-samsung-s6e63m0.c: warning: EXPORT_SYMBOL() is used, but #include is missing Signed-off-by: Thomas Zimmermann Fixes: a934a57a42f6 ("scripts/misc-check: check missing #include when W=1") Reviewed-by: André Almeida Cc: Masahiro Yamada Cc: Nathan Chancellor Link: https://lore.kernel.org/r/20250612121633.229222-8-tzimmermann@suse.de

drm/panel: use fwnode based lookups for panel followers

2025-06-11T08:16:02+00:00

Use firmware node based lookups for panel followers, to make the code independent of OF and device tree, and make it work also for ACPI with an appropriate _DSD. ASL example: Package (0x02) { "panel", \_SB.PCI0.GFX0.LCD0 } v2: - Update comments (Doug, Arun) - s/IS_ERR_OR_NULL/IS_ERR/ (Doug) Suggested-by: Heikki Krogerus Cc: Neil Armstrong Cc: Jessica Zhang Cc: Maxime Ripard Cc: Doug Anderson Cc: Lee Shawn C Tested-by: Lee Shawn C Reviewed-by: Douglas Anderson Tested-by: Douglas Anderson Reviewed-by: Arun R Murthy Acked-by: Maxime Ripard Link: https://lore.kernel.org/r/20250610094132.3240567-1-jani.nikula@intel.com Signed-off-by: Jani Nikula

drm/panel: abstract of_panel_find()

2025-05-22T16:08:35+00:00

Add a helper to wrap OF-specific calls in drm_panel_add_follower() in preparation for adding an ACPI equivalent in the future. No functional changes. Reviewed-by: Dmitry Baryshkov Link: https://lore.kernel.org/r/20250522100036.2529624-1-jani.nikula@intel.com Signed-off-by: Jani Nikula

drm/panel: make prepare/enable and disable/unprepare calls return void

2025-04-22T13:49:11+00:00

Now there are no users of the return value of the drm_panel_prepare(), drm_panel_unprepare(), drm_panel_enable() and drm_panel_disable() calls. Usually these calls are performed from the atomic callbacks, where it is impossible to return an error. Stop returning error codes and return void instead. Reviewed-by: Neil Armstrong Link: https://lore.kernel.org/r/20250401-panel-return-void-v1-7-93e1be33dc8d@oss.qualcomm.com Signed-off-by: Dmitry Baryshkov

drm/panel: Fix build error on !CONFIG_OF

2025-04-08T16:39:50+00:00

Move helpers outside of CONFIG_OF, so basic allocation also works without it. Fixes: ed9c594d495d ("drm/panel: Add new helpers for refcounted panel allocatons") Fixes: dcba396f6907 ("drm/panel: Add refcount support") Reviewed-by: Maxime Ripard Link: https://lore.kernel.org/r/nyrjnvctqnk6f3x5q7rlmy5nb7iopoti56pgh43zqknici5ms4@cibpldh7epra Signed-off-by: Lucas De Marchi

drm/panel: deprecate old-style panel allocation

2025-04-01T14:58:05+00:00

Start moving to the new refcounted allocations using the new API devm_drm_panel_alloc(). Deprecate any other allocation. Reviewed-by: Luca Ceresoli Reviewed-by: Maxime Ripard Signed-off-by: Anusha Srivatsa Link: https://lore.kernel.org/r/20250331-b4-panel-refcounting-v4-3-dad50c60c6c9@redhat.com Signed-off-by: Maxime Ripard

drm/panel: Add refcount support

2025-04-01T14:58:04+00:00

Allocate panel via reference counting. Add _get() and _put() helper functions to ensure panel allocations are refcounted. Avoid use after free by ensuring panel pointer is valid and can be usable till the last reference is put. Reviewed-by: Luca Ceresoli Reviewed-by: Maxime Ripard Signed-off-by: Anusha Srivatsa Link: https://lore.kernel.org/r/20250331-b4-panel-refcounting-v4-2-dad50c60c6c9@redhat.com Signed-off-by: Maxime Ripard

drm/panel: Add new helpers for refcounted panel allocatons

2025-04-01T14:58:03+00:00

Introduce reference counted allocations for panels to avoid use-after-free. The patch adds the macro devm_drm_bridge_alloc() to allocate a new refcounted panel. Followed the documentation for drmm_encoder_alloc() and devm_drm_dev_alloc and other similar implementations for this purpose. Reviewed-by: Maxime Ripard Signed-off-by: Anusha Srivatsa Link: https://lore.kernel.org/r/20250331-b4-panel-refcounting-v4-1-dad50c60c6c9@redhat.com Signed-off-by: Maxime Ripard

drm/bridge: panel: forbid initializing a panel with unknown connector type

2025-02-17T13:17:59+00:00

Having an DRM_MODE_CONNECTOR_Unknown connector type is considered bad, and drm_panel_bridge_add_typed() and derivatives are deprecated for this. drm_panel_init() won't prevent initializing a panel with a DRM_MODE_CONNECTOR_Unknown connector type. Luckily there are no in-tree users doing it, so take this as an opportinuty to document a valid connector type must be passed. Returning an error if this rule is violated is not possible because drm_panel_init() is a void function. Add at least a warning to make any violations noticeable, especially to non-upstream drivers. Reviewed-by: Dmitry Baryshkov Signed-off-by: Luca Ceresoli Signed-off-by: Robert Foss Link: https://patchwork.freedesktop.org/patch/msgid/20250214-drm-assorted-cleanups-v7-5-88ca5827d7af@bootlin.com