linux-kernel - [PATCH AUTOSEL 6.12 03/31] drm: panel-backlight-quirks: Add Framework 13 matte panel

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Message-Id: <20250126145448.930220-3-sashal@kernel.org>
Date: Sun, 26 Jan 2025 09:54:19 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Thomas Weißschuh <linux@...ssschuh.net>,
	"Dustin L . Howett" <dustin@...ett.net>,
	Mario Limonciello <mario.limonciello@....com>,
	Harry Wentland <harry.wentland@....com>,
	Sasha Levin <sashal@...nel.org>,
	maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	tzimmermann@...e.de,
	airlied@...il.com,
	simona@...ll.ch,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.12 03/31] drm: panel-backlight-quirks: Add Framework 13 matte panel

From: Thomas Weißschuh <linux@...ssschuh.net>

[ Upstream commit 916ecc0db336768d80e14ef28a8c64a775274f95 ]

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>
Reviewed-by: Harry Wentland <harry.wentland@....com>
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241111-amdgpu-min-backlight-quirk-v7-3-f662851fda69@weissschuh.net
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 6b8bbed77c7f1..f2aefff618ddb 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,
-- 
2.39.5