linux-kernel - Re: [PATCH v7 0/4] drm: Minimum backlight overrides and implementation for amdgpu

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Message-ID: <78ad9dfc-386f-4aa7-a025-a2ba87936068@amd.com>
Date: Thu, 21 Nov 2024 09:53:59 -0600
From: Mario Limonciello <mario.limonciello@....com>
To: Thomas Weißschuh <linux@...ssschuh.net>,
 Alex Deucher <alexander.deucher@....com>,
 Christian König <christian.koenig@....com>,
 David Airlie <airlied@...il.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 Harry Wentland <harry.wentland@....com>, Leo Li <sunpeng.li@....com>,
 Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
 Matt Hartley <matt.hartley@...il.com>, Kieran Levin <ktl@...mework.net>,
 Hans de Goede <hdegoede@...hat.com>,
 Jani Nikula <jani.nikula@...ux.intel.com>, Xinhui Pan <Xinhui.Pan@....com>,
 Jonathan Corbet <corbet@....net>, Simona Vetter <simona@...ll.ch>,
 Simona Vetter <simona.vetter@...ll.ch>
Cc: amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org, Dustin Howett <dustin@...ett.net>,
 linux-doc@...r.kernel.org
Subject: Re: [PATCH v7 0/4] drm: Minimum backlight overrides and
 implementation for amdgpu

On 11/11/2024 12:09, Thomas Weißschuh wrote:
> The value of "min_input_signal" returned from ATIF on a Framework AMD 13
> is "12". This leads to a fairly bright minimum display backlight.
> 
> Introduce a quirk to override "min_input_signal" to "0" which leads to a
> much lower minimum brightness, which is still readable even in daylight.
> 
> One solution would be a fixed firmware version, which was announced but
> has no timeline.

Hi Thomas,

Thanks for this resubmission and the rebase.  Apologies for the delay, 
but this is now picked up to drm-misc-next.

https://cgit.freedesktop.org/drm/drm-misc/commit/?id=22e5c7ae12145af13785e3ff138395d5b1a22116
https://cgit.freedesktop.org/drm/drm-misc/commit/?id=c2753b2471c65955de18cbc58530641447e5bfe9
https://cgit.freedesktop.org/drm/drm-misc/commit/?id=916ecc0db336768d80e14ef28a8c64a775274f95
https://cgit.freedesktop.org/drm/drm-misc/commit/?id=d80b5c5b9be6b2e1cdeaaeaa8259523b63cae292

Thanks!

> 
> ---
> Changes in v7:
> - Rebase on drm-next
> - Drop now unnecessary hacky allocation of struct drm_edid
> - Link to v6: https://lore.kernel.org/r/20240824-amdgpu-min-backlight-quirk-v6-0-1ed776a17fb3@weissschuh.net
> 
> Changes in v6:
> - Clean up cover letter and commit messages
> - Add my S-o-b to patch from Dustin
> - Mention testing in combination with "panel_power_savings"
> - Link to v5: https://lore.kernel.org/r/20240818-amdgpu-min-backlight-quirk-v5-0-b6c0ead0c73d@weissschuh.net
> 
> Changes in v5:
> - Forward-declare struct drm_edid
> - Reorder patches, quirk entries are last
> - Add patch from Dustin for additional quirk entries
> - Link to v4: https://lore.kernel.org/r/20240812-amdgpu-min-backlight-quirk-v4-0-56a63ff897b7@weissschuh.net
> 
> Changes in v4:
> - Switch back to v2 implementation
> - Add MODULE_DESCRIPTION()
> - Simplify quirk infrastructure to only handle min backlight quirks.
>    It can be extended if necessary.
> - Expand documentation.
> - Link to v3: https://lore.kernel.org/r/20240731-amdgpu-min-backlight-quirk-v3-0-46d40bb21a62@weissschuh.net
> 
> Changes in v3:
> - Switch to cmdline override parameter
> - Link to v2: https://lore.kernel.org/r/20240623-amdgpu-min-backlight-quirk-v2-0-cecf7f49da9b@weissschuh.net
> 
> Changes in v2:
> - Introduce proper drm backlight quirk infrastructure
> - Quirk by EDID and DMI instead of only DMI
> - Limit quirk to only single Framework 13 matte panel
> - Link to v1: https://lore.kernel.org/r/20240610-amdgpu-min-backlight-quirk-v1-1-8459895a5b2a@weissschuh.net
> 
> ---
> Dustin L. Howett (1):
>        drm: panel-backlight-quirks: Add Framework 13 glossy and 2.8k panels
> 
> Thomas Weißschuh (3):
>        drm: Add panel backlight quirks
>        drm/amd/display: Add support for minimum backlight quirk
>        drm: panel-backlight-quirks: Add Framework 13 matte panel
> 
>   Documentation/gpu/drm-kms-helpers.rst             |  3 +
>   drivers/gpu/drm/Kconfig                           |  4 +
>   drivers/gpu/drm/Makefile                          |  1 +
>   drivers/gpu/drm/amd/amdgpu/Kconfig                |  1 +
>   drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  6 ++
>   drivers/gpu/drm/drm_panel_backlight_quirks.c      | 94 +++++++++++++++++++++++
>   include/drm/drm_utils.h                           |  4 +
>   7 files changed, 113 insertions(+)
> ---
> base-commit: 377dda2cff59825079aee3906aa4904779747b0b
> change-id: 20240610-amdgpu-min-backlight-quirk-8402fd8e736a
> 
> Best regards,