linux-kernel - [PATCH v2 12/13] arm64: dts: mediatek: mt8186-corsola: Reserve memory for audio frontend

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Message-ID: <20250424102509.1083185-13-wenst@chromium.org>
Date: Thu, 24 Apr 2025 18:25:06 +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 12/13] arm64: dts: mediatek: mt8186-corsola: 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 MT8186 Corsola family as well, to
align with the other MediaTek-based ChromeOS platforms. This also helps
with memory starvation as these devices sometimes end up in low memory
conditions.

Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
---
 arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi b/arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi
index c864ed495702..b139588ae246 100644
--- a/arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi
@@ -161,6 +161,13 @@ 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;
+		};
+
 		adsp_dma_mem: memory@...00000 {
 			compatible = "shared-dma-pool";
 			reg = <0 0x61000000 0 0x100000>;
@@ -310,6 +317,7 @@ &adsp {
 };
 
 &afe {
+	memory-region = <&afe_dma_mem>;
 	status = "okay";
 };
 
-- 
2.49.0.805.g082f7c87e0-goog