Thomas Weißschuh 33c98577e4 drm: Add panel backlight quirks ...

BugLink: https://bugs.launchpad.net/bugs/2114239

[ Upstream commit 22e5c7ae12145af13785e3ff138395d5b1a22116 ]

Panels using a PWM-controlled backlight source do not have a standard
way to communicate their valid PWM ranges.
On x86 the ranges are read from ACPI through driver-specific tables.
The built-in ranges are not necessarily correct, or may grow stale if an
older device can be retrofitted with newer panels.

Add a quirk infrastructure with which the minimum valid backlight value
can be maintained as part of the kernel.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Tested-by: Dustin L. Howett <dustin@howett.net>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241111-amdgpu-min-backlight-quirk-v7-1-f662851fda69@weissschuh.net
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Noah Wager <noah.wager@canonical.com>
Signed-off-by: Mehmet Basaran <mehmet.basaran@canonical.com>

2025-06-15 10:39:05 +03:00

..

amdgpu

Documentation/amdgpu: Remove a spurious character

2023-12-19 14:48:14 -05:00

bridge

drm: bridge: dw-hdmi: Add Documentation on supported input formats

2017-04-04 17:48:21 +02:00

dp-mst

drm/dp_mst: Introduce new refcounting scheme for mstbs and ports

2019-01-10 20:12:19 -05:00

imagination

drm/imagination: Numerous documentation fixes.

2023-11-28 18:56:03 +01:00

rfc

drm/doc/rfc: Xe is using drm_exec, so mark as completed

2023-12-07 11:01:12 -05:00

xe

drm/xe/doc: Include documentation about xe_assert()

2023-12-21 11:45:08 -05:00

afbc.rst

drm/afbc: Add AFBC modifier usage documentation

2019-01-11 17:52:06 +00:00

automated_testing.rst

drm/doc: ci: Add IGT version details for flaky tests

2023-12-13 15:18:30 -03:00

backlight.rst

doc-rst: Wire-up Backlight kernel-doc documentation

2020-07-20 10:26:22 +01:00

driver-uapi.rst

drm/doc: include xe_drm.h

2023-12-21 11:35:00 -05:00

drivers.rst

drm/xe: Introduce a new DRM driver for Intel GPUs

2023-12-12 14:05:48 -05:00

drm-client.rst

drm/fb-helper: Remove drm_fb_helper_crtc

2019-06-04 12:13:47 +02:00

drm-internals.rst

drm/doc: Add KUnit documentation

2022-06-27 13:46:03 +02:00

drm-kms-helpers.rst

drm: Add panel backlight quirks

2025-06-15 10:39:05 +03:00

drm-kms.rst

drm: Allow drivers to indicate the damage helpers to ignore damage clips

2023-11-24 15:15:25 +01:00

drm-mm.rst

Documentation/gpu: VM_BIND locking document

2023-11-29 20:54:43 +01:00

drm-uapi.rst

drm/doc: use cross-references for macros

2023-10-23 17:03:58 +02:00

drm-usage-stats.rst

Merge drm/drm-next into drm-misc-next

2023-10-11 09:50:59 +02:00

drm-vm-bind-async.rst

Documentation/gpu: Add a VM_BIND async document

2023-10-17 10:38:07 +02:00

drm-vm-bind-locking.rst

Documentation/gpu: VM_BIND locking document

2023-11-29 20:54:43 +01:00

i915.rst

drm/i915: Add missing GSCCS documentation

2023-10-02 12:22:44 -04:00

implementation_guidelines.rst

Documentation/gpu: VM_BIND locking document

2023-11-29 20:54:43 +01:00

index.rst

Documentation/gpu: Add a VM_BIND async document

2023-10-17 10:38:07 +02:00

introduction.rst

drm/doc: Add sections about tiny drivers and external refs to intro page

2022-04-22 13:56:31 +02:00

kms-properties.csv

Documentation: Fix typos

2023-08-18 11:29:03 -06:00

komeda-kms.rst

Documentation: Fix typos

2023-08-18 11:29:03 -06:00

mcde.rst

drm/mcde: Fix reference to DOC comment

2019-10-05 20:35:14 +02:00

meson.rst

Documentation/gpu/meson: Remove link to meson_canvas.c

2019-04-05 08:35:05 -04:00

msm-crash-dump.rst

Documentation: Fix typos

2023-08-18 11:29:03 -06:00

panfrost.rst

drm/panfrost: Add fdinfo support GPU load metrics

2023-10-04 13:04:15 +02:00

pl111.rst

drm: pl111: Update documentation

2020-07-23 10:06:22 +02:00

tegra.rst

drm/tegra: Add driver documentation

2017-06-15 13:58:56 +02:00

todo.rst

drm: Fix TODO list mentioning non-KMS drivers

2023-12-06 10:06:09 +01:00

tve200.rst

drm/tve200: fix kernel-doc documentation comment include

2018-02-21 09:26:38 +02:00

v3d.rst

drm/v3d: Add missing v3d documentation structure.

2018-07-05 11:42:50 -07:00

vc4.rst

drm/vc4: Improve the KUnit documentation

2022-12-15 08:54:08 +01:00

vga-switcheroo.rst

drm/doc: Fix vga_switcheroo xref

2016-08-24 13:11:08 +02:00

vgaarbiter.rst

PCI/VGA: Move vgaarb to drivers/pci

2022-03-09 18:30:46 -06:00

vkms.rst

drm/vkms: drop "Rotation" TODO

2023-05-08 09:57:24 -03:00

xen-front.rst

drm/xen-front: Remove CMA support

2018-04-18 10:18:27 +03:00