linux-kernel - [PATCH v2 10/13] arm64: dts: mediatek: mt8173: Reserve memory for audio frontend

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Message-ID: <20250424102509.1083185-11-wenst@chromium.org>
Date: Thu, 24 Apr 2025 18:25:04 +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 10/13] arm64: dts: mediatek: mt8173: 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 MT8173 as well, to align with the
other 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/mt8173.dtsi | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8173.dtsi b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
index 6d1d8877b43f..122a57c3780b 100644
--- a/arch/arm64/boot/dts/mediatek/mt8173.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
@@ -318,6 +318,14 @@ reserved-memory {
 		#address-cells = <2>;
 		#size-cells = <2>;
 		ranges;
+
+		afe_dma_mem: audio-dma-pool {
+			compatible = "shared-dma-pool";
+			size = <0 0x100000>;
+			alignment = <0 0x10>;
+			no-map;
+		};
+
 		vpu_dma_reserved: vpu-dma-mem@...00000 {
 			compatible = "shared-dma-pool";
 			reg = <0 0xb7000000 0 0x500000>;
@@ -887,6 +895,7 @@ afe: audio-controller@...20000  {
 					  <&topckgen CLK_TOP_AUD_2_SEL>;
 			assigned-clock-parents = <&topckgen CLK_TOP_APLL1>,
 						 <&topckgen CLK_TOP_APLL2>;
+			memory-region = <&afe_dma_mem>;
 		};
 
 		mmc0: mmc@...30000 {
-- 
2.49.0.805.g082f7c87e0-goog