linux-kernel - [PATCH v2 11/13] arm64: dts: mediatek: mt8183-kukui: Reserve memory for audio frontend

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Message-ID: <20250424102509.1083185-12-wenst@chromium.org>
Date: Thu, 24 Apr 2025 18:25:05 +0800
From: Chen-Yu Tsai <wenst@...omium.org>
To: Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>
Cc: Chen-Yu Tsai <wenst@...omium.org>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Jiaxin Yu <jiaxin.yu@...iatek.com>,
	linux-sound@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 11/13] arm64: dts: mediatek: mt8183-kukui: Reserve memory for audio frontend

Some MediaTek platforms already reserve a small block of memory for the
audio frontend. These platforms reserve it at a fixed address, though it
is unclear if that is due to hardware access restrictions or simply
compacting the reserved memory blocks together.

Reserve the same size of memory on the MT8183 Kukui & Jacuzzi families
as well, to align with the other MediaTek-based ChromeOS platforms. This
also helps with memory starvation as these devices commonly end up in
low memory conditions.

Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
---
 arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi b/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
index 0fe9f2d1b912..00b97cfa0eec 100644
--- a/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
@@ -85,6 +85,13 @@ reserved_memory: reserved-memory {
 		#size-cells = <2>;
 		ranges;
 
+		afe_dma_mem: audio-dma-pool {
+			compatible = "shared-dma-pool";
+			size = <0 0x100000>;
+			alignment = <0 0x10>;
+			no-map;
+		};
+
 		scp_mem_reserved: memory@...00000 {
 			compatible = "shared-dma-pool";
 			reg = <0 0x50000000 0 0x2900000>;
@@ -198,6 +205,10 @@ tboard_thermistor2: thermal-sensor2 {
 	};
 };
 
+&afe {
+	memory-region = <&afe_dma_mem>;
+};
+
 &auxadc {
 	status = "okay";
 };
-- 
2.49.0.805.g082f7c87e0-goog