[PATCH v4 00/31] drm/kms: Stop registering multiple /sys/class/backlight devs for a single display

[Hans de Goede <hdegoede@redhat.com>]

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/

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

Note the i915 patches (patch 2 and 12 still need a review/ack, and
I've dropped the previouw review of the nouveau patches because of
changes there. Please review.

This series as submitted is based on drm-tip for CI purposes.
I also have an immutable branch based on 6.0-rc1 with these
same patches available here:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=backlight-detect-refactor-v4
assuming the i915 patches also pass review I hope to 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
  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() (v2)
  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 +
 .../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_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, 570 insertions(+), 506 deletions(-)
 create mode 100644 include/linux/platform_data/x86/nvidia-wmi-ec-backlight.h

-- 
2.37.2