linux-kernel - [PATCH v1 3/5] drm: panel-backlight-quirks: Add secondary DMI match

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Message-ID: <20250824200202.1744335-4-lkml@antheas.dev>
Date: Sun, 24 Aug 2025 22:02:00 +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>,
	Antheas Kapenekakis <lkml@...heas.dev>
Subject: [PATCH v1 3/5] drm: panel-backlight-quirks: Add secondary DMI match

Using a single DMI match only allows matching per manufacturer.
Introduce a second optional match to allow matching make/model.
In addition, make DMI optional to allow matching only by EDID.

Signed-off-by: Antheas Kapenekakis <lkml@...heas.dev>
---
 drivers/gpu/drm/drm_panel_backlight_quirks.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/drm_panel_backlight_quirks.c b/drivers/gpu/drm/drm_panel_backlight_quirks.c
index 702726c20ccc..3d386a96e50e 100644
--- a/drivers/gpu/drm/drm_panel_backlight_quirks.c
+++ b/drivers/gpu/drm/drm_panel_backlight_quirks.c
@@ -8,11 +8,14 @@
 #include <drm/drm_edid.h>
 #include <drm/drm_utils.h>
 
+struct drm_panel_match {
+	enum dmi_field field;
+	const char * const value;
+};
+
 struct drm_get_panel_backlight_quirk {
-	struct {
-		enum dmi_field field;
-		const char * const value;
-	} dmi_match;
+	struct drm_panel_match dmi_match;
+	struct drm_panel_match dmi_match_other;
 	struct drm_edid_ident ident;
 	struct drm_panel_backlight_quirk quirk;
 };
@@ -48,7 +51,13 @@ static bool drm_panel_min_backlight_quirk_matches(
 	const struct drm_get_panel_backlight_quirk *quirk,
 	const struct drm_edid *edid)
 {
-	if (!dmi_match(quirk->dmi_match.field, quirk->dmi_match.value))
+	if (quirk->dmi_match.field &&
+	    !dmi_match(quirk->dmi_match.field, quirk->dmi_match.value))
+		return false;
+
+	if (quirk->dmi_match_other.field &&
+	    !dmi_match(quirk->dmi_match_other.field,
+		       quirk->dmi_match_other.value))
 		return false;
 
 	if (quirk->ident.panel_id && !drm_edid_match(edid, &quirk->ident))
-- 
2.50.1