linux-kernel - Re: [PATCH AUTOSEL 6.12 02/31] drm: Add panel backlight quirks

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Message-ID: <93a9e956-9572-410e-947c-36aeba4965bf@t-8ch.de>
Date: Sun, 26 Jan 2025 17:28:27 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Sasha Levin <sashal@...nel.org>
Cc: linux-kernel@...r.kernel.org, stable@...r.kernel.org, 
	"Dustin L . Howett" <dustin@...ett.net>, Mario Limonciello <mario.limonciello@....com>, 
	Harry Wentland <harry.wentland@....com>, airlied@...il.com, simona@...ll.ch, 
	maarten.lankhorst@...ux.intel.com, mripard@...nel.org, tzimmermann@...e.de, corbet@....net, 
	dri-devel@...ts.freedesktop.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 6.12 02/31] drm: Add panel backlight quirks

Hi Sasha,

On 2025-01-26 09:54:18-0500, Sasha Levin wrote:
> From: Thomas Weißschuh <linux@...ssschuh.net>
> 
> [ 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.

This series [0] has been applied to the 6.12 and 6.13 stable trees.
However it is introducing new functionality and not fixing any bug.
Furthermore, for 6.12 the patch for drm/amd/display enabling the new
functionality was not even applied, making all of it dead code.

[0] https://lore.kernel.org/lkml/20241111-amdgpu-min-backlight-quirk-v7-0-f662851fda69@weissschuh.net/

	Patches:
	drm: Add panel backlight quirks
	drm/amd/display: Add support for minimum backlight quirk
	drm: panel-backlight-quirks: Add Framework 13 matte panel
	drm: panel-backlight-quirks: Add Framework 13 glossy and 2.8k panels


Regards,
Thomas