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drm: Add panel backlight quirks

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[ 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>
This commit is contained in:
Thomas Weißschuh
2024-11-11 19:09:35 +01:00
committed by Greg Kroah-Hartman
parent 18daf9e83c
commit c5842f1dad
5 changed files with 82 additions and 0 deletions
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Documentation/gpu/drm-kms-helpers.rst
+3
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@@ -230,6 +230,9 @@ Panel Helper Reference
.. kernel-doc:: drivers/gpu/drm/drm_panel_orientation_quirks.c
:export:
.. kernel-doc:: drivers/gpu/drm/drm_panel_backlight_quirks.c
:export:
Panel Self Refresh Helper Reference
===================================