linux-kernel - Re: [PATCH v5 3/4] drm: panel-backlight-quirks: Add Framework 13 matte panel

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Message-ID: <647ee875-f932-46a9-b4e2-fb037a548754@amd.com>
Date: Wed, 21 Aug 2024 15:54:56 -0500
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>, Daniel Vetter <daniel@...ll.ch>,
 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>
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 v5 3/4] drm: panel-backlight-quirks: Add Framework 13
 matte panel

On 8/18/2024 01:56, 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.
> 
> Add a quirk to override that the minimum backlight PWM to "0" which
> leads to a much lower minimum brightness, which is still visible.
> 
> Tested on a Framework AMD 13 BIOS 3.05 with the matte panel.
> 
> Link: https://community.frame.work/t/25711/9
> Link: https://community.frame.work/t/47036
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> Tested-by: Dustin L. Howett <dustin@...ett.net>
Reviewed-by: Mario Limonciello <mario.limonciello@....com>
> ---
>   drivers/gpu/drm/drm_panel_backlight_quirks.c | 8 ++++++++
>   1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_panel_backlight_quirks.c b/drivers/gpu/drm/drm_panel_backlight_quirks.c
> index 6b8bbed77c7f..f2aefff618dd 100644
> --- a/drivers/gpu/drm/drm_panel_backlight_quirks.c
> +++ b/drivers/gpu/drm/drm_panel_backlight_quirks.c
> @@ -17,6 +17,14 @@ struct drm_panel_min_backlight_quirk {
>   };
>   
>   static const struct drm_panel_min_backlight_quirk drm_panel_min_backlight_quirks[] = {
> +	/* 13 inch matte panel */
> +	{
> +		.dmi_match.field = DMI_BOARD_VENDOR,
> +		.dmi_match.value = "Framework",
> +		.ident.panel_id = drm_edid_encode_panel_id('B', 'O', 'E', 0x0bca),
> +		.ident.name = "NE135FBM-N41",
> +		.min_brightness = 0,
> +	},
>   };
>   
>   static bool drm_panel_min_backlight_quirk_matches(const struct drm_panel_min_backlight_quirk *quirk,
>