linux-kernel - [PATCH] arm64: dts: apple: t6002: Fix GPU power domains

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Date:   Wed,  7 Dec 2022 10:43:04 +0900
From:   Asahi Lina <lina@...hilina.net>
To:     Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Janne Grunau <j@...nau.net>
Cc:     Marc Zyngier <maz@...nel.org>, asahi@...ts.linux.dev,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Asahi Lina <lina@...hilina.net>
Subject: [PATCH] arm64: dts: apple: t6002: Fix GPU power domains

On t6002 (M1 Ultra), each die contains a self-contained GPU block.
However, only the coprocessor and global management circuitry of the
first die are used. This is what is represented by the "gpu" PS (the
one in die1 is disabled). Nonetheless, this shared component drives the
processing blocks in both dies, and therefore depends on the AFR fabric
being powered up on both dies.

Add an explicit dependency from the GPU block on die0 to AFR on die1,
next to the existing die0 AFR dependency.

Fixes: fa86294eb355 ("arm64: dts: apple: Add initial t6000/t6001/t6002 DTs")
Signed-off-by: Asahi Lina <lina@...hilina.net>
---
 arch/arm64/boot/dts/apple/t6002.dtsi | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/boot/dts/apple/t6002.dtsi b/arch/arm64/boot/dts/apple/t6002.dtsi
index 1376103b49c6..8fa2d8dd72ff 100644
--- a/arch/arm64/boot/dts/apple/t6002.dtsi
+++ b/arch/arm64/boot/dts/apple/t6002.dtsi
@@ -296,3 +296,8 @@ &cpu_p20 &cpu_p21 &cpu_p22 &cpu_p23
 		};
 	};
 };
+
+&ps_gfx {
+	// On t6002, the die0 GPU power domain needs both AFR power domains
+	power-domains = <&ps_afr>, <&ps_afr_die1>;
+};
-- 
2.35.1