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

[Rafael J. Wysocki]

On Tue, Jul 12, 2022 at 9:39 PM Hans de Goede <hdegoede at redhat.com> wrote:
>
> 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.

Please feel free to add

Acked-by: Rafael J. Wysocki <rafael.j.wysocki at intel.com>

to all of the ACPI video patches in this series.

Thanks!

> 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(-)
>
> --
> 2.36.0
>