linux-kernel - [PATCH] arm64: dts: apple: touchbar: Mark ps_dispdfr

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Message-Id: <20250416-arm64_dts_apple_touchbar-v1-1-e1c0b53b9125@jannau.net>
Date: Wed, 16 Apr 2025 20:06:18 +0200
From: Janne Grunau via B4 Relay <devnull+j.jannau.net@...nel.org>
To: Sven Peter <sven@...npeter.dev>, 
 Alyssa Rosenzweig <alyssa@...enzweig.io>, Neal Gompa <neal@...pa.dev>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Nick Chan <towinchenmi@...il.com>, 
 Sasha Finkelstein <fnkl.kernel@...il.com>
Cc: asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Janne Grunau <j@...nau.net>
Subject: [PATCH] arm64: dts: apple: touchbar: Mark ps_dispdfr_be as
 always-on

From: Janne Grunau <j@...nau.net>

The driver depends on boot loader initialized state which resets when the
ps_dispdfr_be power-domain is powered off. This happens on suspend or
when the driver is missing during boot.
Mark the domain as always on until the driver can handle this.

Fixes: 7275e795e520 ("arm64: dts: apple: Add touchbar screen nodes")
Signed-off-by: Janne Grunau <j@...nau.net>
---
 arch/arm64/boot/dts/apple/t8103-j293.dts | 10 ++++++++++
 arch/arm64/boot/dts/apple/t8112-j493.dts | 10 ++++++++++
 2 files changed, 20 insertions(+)

diff --git a/arch/arm64/boot/dts/apple/t8103-j293.dts b/arch/arm64/boot/dts/apple/t8103-j293.dts
index 2dfe7b895b2bc0a913e73141e558fa5124a13b2e..e2d9439397f71a93c28b75a7eea589f4bcb3e374 100644
--- a/arch/arm64/boot/dts/apple/t8103-j293.dts
+++ b/arch/arm64/boot/dts/apple/t8103-j293.dts
@@ -77,6 +77,16 @@ touchbar0: touchbar@0 {
 	};
 };
 
+/*
+ * The driver depends on boot loader initialized state which resets when this
+ * power-domain is powered off. This happens on suspend or when the driver is
+ * missing during boot. Mark the domain as always on until the driver can
+ * handle this.
+ */
+&ps_dispdfr_be {
+	apple,always-on;
+};
+
 &display_dfr {
 	status = "okay";
 };
diff --git a/arch/arm64/boot/dts/apple/t8112-j493.dts b/arch/arm64/boot/dts/apple/t8112-j493.dts
index 3d73f9ee2f46a35a3b23da5b233ef316c7372ef7..be86d34c6696cb47d31696541266e504cee8ce10 100644
--- a/arch/arm64/boot/dts/apple/t8112-j493.dts
+++ b/arch/arm64/boot/dts/apple/t8112-j493.dts
@@ -40,6 +40,16 @@ led-0 {
 	};
 };
 
+/*
+ * The driver depends on boot loader initialized state which resets when this
+ * power-domain is powered off. This happens on suspend or when the driver is
+ * missing during boot. Mark the domain as always on until the driver can
+ * handle this.
+ */
+&ps_dispdfr_be {
+	apple,always-on;
+};
+
 &display_dfr {
 	status = "okay";
 };

---
base-commit: 0af2f6be1b4281385b618cb86ad946eded089ac8
change-id: 20250416-arm64_dts_apple_touchbar-658cd974de97

Best regards,
-- 
Janne Grunau <j@...nau.net>