linux-kernel - [PATCH v2 5/5] drm: panel-backlight-quirks: Add Steam Deck brightness quirk

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Message-ID: <20250827174400.3692549-6-lkml@antheas.dev>
Date: Wed, 27 Aug 2025 19:44:00 +0200
From: Antheas Kapenekakis <lkml@...heas.dev>
To: amd-gfx@...ts.freedesktop.org
Cc: dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	philm@...jaro.org,
	Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>,
	Mario Limonciello <mario.limonciello@....com>,
	Robert Beckett <bob.beckett@...labora.com>,
	Antheas Kapenekakis <lkml@...heas.dev>
Subject: [PATCH v2 5/5] drm: panel-backlight-quirks: Add Steam Deck brightness
 quirk

On the SteamOS kernel, Valve universally makes minimum brightness 0
for all devices. SteamOS is (was?) meant for the Steam Deck, so
enabling it universally is reasonable. However, it causes issues in
certain devices. Therefore, introduce it just for the Steam Deck here.

SteamOS kernel does not have a public mirror, but this replaces commit
806dd74bb225 ("amd/drm: override backlight min value from 12 -> 0")
in the latest, as of this writing, SteamOS kernel (6.11.11-valve24).
See unofficial mirror reconstructed from sources below.

Link: https://gitlab.com/evlaV/linux-integration/-/commit/806dd74bb225
Reviewed-by: Robert Beckett <bob.beckett@...labora.com>
Signed-off-by: Antheas Kapenekakis <lkml@...heas.dev>
---
 drivers/gpu/drm/drm_panel_backlight_quirks.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/drm_panel_backlight_quirks.c b/drivers/gpu/drm/drm_panel_backlight_quirks.c
index 2bdbd5583d32..69d38c248a0a 100644
--- a/drivers/gpu/drm/drm_panel_backlight_quirks.c
+++ b/drivers/gpu/drm/drm_panel_backlight_quirks.c
@@ -81,6 +81,21 @@ static const struct drm_get_panel_backlight_quirk drm_panel_min_backlight_quirks
 		.dmi_match_other.value = "ONEXPLAYER F1 EVA-02",
 		.quirk = { .brightness_mask = 3, },
 	},
+	/* Steam Deck models */
+	{
+		.dmi_match.field = DMI_SYS_VENDOR,
+		.dmi_match.value = "Valve",
+		.dmi_match_other.field = DMI_PRODUCT_NAME,
+		.dmi_match_other.value = "Jupiter",
+		.quirk = { .min_brightness = 1, },
+	},
+	{
+		.dmi_match.field = DMI_SYS_VENDOR,
+		.dmi_match.value = "Valve",
+		.dmi_match_other.field = DMI_PRODUCT_NAME,
+		.dmi_match_other.value = "Galileo",
+		.quirk = { .min_brightness = 1, },
+	},
 };
 
 static bool drm_panel_min_backlight_quirk_matches(
-- 
2.51.0