Hi All, As mentioned in my RFC titled "drm/kms: control display brightness through drm_connector properties": https://lore.kernel.org/dri-devel/0d188965-d809-81b5-74ce-7d30c49fee2d@xxxxxxxxxx/ The first step towards this is to deal with some existing technical debt in backlight handling on x86/ACPI boards, specifically we need to stop registering multiple /sys/class/backlight devs for a single display. This series implements my RFC describing my plan for these cleanups: https://lore.kernel.org/dri-devel/98519ba0-7f18-201a-ea34-652f50343158@xxxxxxxxxx/ Changes in version 5: - Use drm_info(drm_dev, ...) in patch 2/31 - Modify "drm/i915: Call acpi_video_register_backlight()", dropping the global has_panel flag, replacing it with a new intel_acpi_video_register() helper Changes in version 4: - Minor tweaks to nvidia-wmi-ec-backlight changes - Add nouveau_acpi_* wrappers around used include/acpi/video.h functions to fix unresolved symbol errors on non X86 Changes in version 3: - ACPI_VIDEO can now be enabled on non X86 too, adjust various Kconfig changes - Make the delay before doing fallback acpi_video backlight registration a module option (patch 9) - Move the nvidia-wmi-ec-backlight fw API definitions to a shared header - Add a "acpi_video_get_backlight_type() == acpi_backlight_nvidia_wmi_ec" check to the nvidia-wmi-ec-backlight driver (patch 19) Changes in version 2: - Introduce acpi_video_backlight_use_native() helper - Finishes the refactoring, addressing all the bits from the "Other issues" section of the refactor RFC This series as submitted is based on drm-tip for CI purposes. Assuming the last i915 patch also pass review now, I hope to push out an immutable branch with this series on top of v6.0-rc1 and send out a pull-request to all involved subsystems based on this branch soon. Regards, Hans Hans de Goede (31): ACPI: video: Add acpi_video_backlight_use_native() helper drm/i915: Don't register backlight when another backlight should be used (v2) drm/amdgpu: Don't register backlight when another backlight should be used (v3) drm/radeon: Don't register backlight when another backlight should be used (v3) drm/nouveau: Don't register backlight when another backlight should be used (v2) ACPI: video: Drop backlight_device_get_by_type() call from acpi_video_get_backlight_type() ACPI: video: Remove acpi_video_bus from list before tearing it down ACPI: video: Simplify acpi_video_unregister_backlight() ACPI: video: Make backlight class device registration a separate step (v2) ACPI: video: Remove code to unregister acpi_video backlight when a native backlight registers drm/i915: Call acpi_video_register_backlight() (v3) drm/nouveau: Register ACPI video backlight when nv_backlight registration fails (v2) drm/amdgpu: Register ACPI video backlight when skipping amdgpu backlight registration drm/radeon: Register ACPI video backlight when skipping radeon backlight registration platform/x86: nvidia-wmi-ec-backlight: Move fw interface definitions to a header (v2) ACPI: video: Refactor acpi_video_get_backlight_type() a bit ACPI: video: Add Nvidia WMI EC brightness control detection (v3) ACPI: video: Add Apple GMUX brightness control detection platform/x86: nvidia-wmi-ec-backlight: Use acpi_video_get_backlight_type() platform/x86: apple-gmux: Stop calling acpi/video.h functions platform/x86: toshiba_acpi: Stop using acpi_video_set_dmi_backlight_type() platform/x86: acer-wmi: Move backlight DMI quirks to acpi/video_detect.c platform/x86: asus-wmi: Drop DMI chassis-type check from backlight handling platform/x86: asus-wmi: Move acpi_backlight=vendor quirks to ACPI video_detect.c platform/x86: asus-wmi: Move acpi_backlight=native quirks to ACPI video_detect.c platform/x86: samsung-laptop: Move acpi_backlight=[vendor|native] quirks to ACPI video_detect.c ACPI: video: Remove acpi_video_set_dmi_backlight_type() ACPI: video: Drop "Samsung X360" acpi_backlight=native quirk ACPI: video: Drop NL5x?U, PF4NU1F and PF5?U?? acpi_backlight=native quirks ACPI: video: Fix indentation of video_detect_dmi_table[] entries drm/todo: Add entry about dealing with brightness control on devices with > 1 panel Documentation/gpu/todo.rst | 68 +++ MAINTAINERS | 1 + drivers/acpi/Kconfig | 1 + drivers/acpi/acpi_video.c | 64 ++- drivers/acpi/video_detect.c | 428 +++++++++++------- drivers/gpu/drm/Kconfig | 14 + .../gpu/drm/amd/amdgpu/atombios_encoders.c | 14 +- .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 9 + drivers/gpu/drm/gma500/Kconfig | 2 + drivers/gpu/drm/i915/Kconfig | 2 + drivers/gpu/drm/i915/display/intel_acpi.c | 27 ++ drivers/gpu/drm/i915/display/intel_acpi.h | 3 + .../gpu/drm/i915/display/intel_backlight.c | 7 + drivers/gpu/drm/i915/display/intel_display.c | 2 +- drivers/gpu/drm/nouveau/nouveau_acpi.c | 10 + drivers/gpu/drm/nouveau/nouveau_acpi.h | 4 + drivers/gpu/drm/nouveau/nouveau_backlight.c | 13 + drivers/gpu/drm/radeon/atombios_encoders.c | 7 + drivers/gpu/drm/radeon/radeon_encoders.c | 11 +- .../gpu/drm/radeon/radeon_legacy_encoders.c | 7 + drivers/platform/x86/Kconfig | 1 + drivers/platform/x86/acer-wmi.c | 66 --- drivers/platform/x86/apple-gmux.c | 3 - drivers/platform/x86/asus-nb-wmi.c | 21 - drivers/platform/x86/asus-wmi.c | 13 - drivers/platform/x86/asus-wmi.h | 2 - drivers/platform/x86/eeepc-wmi.c | 25 +- .../platform/x86/nvidia-wmi-ec-backlight.c | 82 +--- drivers/platform/x86/samsung-laptop.c | 87 ---- drivers/platform/x86/toshiba_acpi.c | 16 - include/acpi/video.h | 9 +- .../x86/nvidia-wmi-ec-backlight.h | 76 ++++ 32 files changed, 588 insertions(+), 507 deletions(-) create mode 100644 include/linux/platform_data/x86/nvidia-wmi-ec-backlight.h -- 2.37.2
