[PATCH v2 00/29] drm/kms: Stop registering multiple /sys/class/backlight devs for a single display

[Hans de Goede]

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@redhat.com/

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@redhat.com/

This new version addresses the few small remarks made on version 1 (mainly
changing patch 1/29) and more importantly this finishes the refactoring by
else addressing all the bits from the "Other issues" section of
the refactor RFC (resulting in patches 15-29 which are new in v2).

Please review and test! I hope to be able to make an immutable branch
based on 5.20-rc1 + this series available for merging into the various
touched subsystems once 5.20-rc2 is out.

Regards,

Hans


Hans de Goede (29):
  ACPI: video: Add acpi_video_backlight_use_native() helper
  drm/i915: Don't register backlight when another backlight should be
    used
  drm/amdgpu: Don't register backlight when another backlight should be
    used
  drm/radeon: Don't register backlight when another backlight should be
    used
  drm/nouveau: Don't register backlight when another backlight should be
    used
  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
  ACPI: video: Remove code to unregister acpi_video backlight when a
    native backlight registers
  drm/i915: Call acpi_video_register_backlight() (v2)
  drm/nouveau: Register ACPI video backlight when nv_backlight
    registration fails
  drm/amdgpu: Register ACPI video backlight when skipping amdgpu
    backlight registration
  drm/radeon: Register ACPI video backlight when skipping radeon
    backlight registration
  ACPI: video: Refactor acpi_video_get_backlight_type() a bit
  ACPI: video: Add Nvidia WMI EC brightness control detection
  ACPI: video: Add Apple GMUX brightness control detection
  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 Clevo/TUXEDO NL5xRU and NL5xNU 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 +++
 drivers/acpi/Kconfig                          |   1 +
 drivers/acpi/acpi_video.c                     |  59 ++-
 drivers/acpi/video_detect.c                   | 415 +++++++++++-------
 drivers/gpu/drm/Kconfig                       |  12 +
 .../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 +
 .../gpu/drm/i915/display/intel_backlight.c    |   7 +
 drivers/gpu/drm/i915/display/intel_display.c  |   8 +
 drivers/gpu/drm/i915/display/intel_panel.c    |   3 +
 drivers/gpu/drm/i915/i915_drv.h               |   2 +
 drivers/gpu/drm/nouveau/nouveau_backlight.c   |  14 +
 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/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 +-
 drivers/platform/x86/samsung-laptop.c         |  87 ----
 drivers/platform/x86/toshiba_acpi.c           |  16 -
 include/acpi/video.h                          |   9 +-
 26 files changed, 468 insertions(+), 415 deletions(-)

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2.36.0