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From: Justin Yeh <justin.yeh@mediatek.com>
To: Matthias Brugger <matthias.bgg@gmail.com>,
	AngeloGioacchino Del Regno
	<angelogioacchino.delregno@collabora.com>,
	Chen-Yu Tsai <wenst@chromium.org>, Fei Shao <fshao@chromium.org>
Cc: Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>, <devicetree@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-mediatek@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>,
	<Project_Global_Chrome_Upstream_Group@mediatek.com>,
	Justin Yeh <justin.yeh@mediatek.com>
Subject: [PATCH] arm64: dts: mediatek: mt8188-geralt: Enlarge SCP core0 memory region
Date: Mon, 24 Aug 2026 17:04:00 +0800	[thread overview]
Message-ID: <20260824090409.203230-1-justin.yeh@mediatek.com> (raw)

The SCP firmware in linux-firmware for this platform
(mediatek/mt8188/scp_c0.img) supports MDP, which the mdp3-rdma node
drives through scp_c0. On top of the segments it loads, the firmware
allocates a 1 MiB DMA region at 0x50800000 at run time. That lies
outside the 8 MiB reserved for SCP core0, so Linux is free to allocate
over memory the firmware uses.

Enlarge the region to 9 MiB. apu_mem starts at 0x55000000, so no other
reserved region has to move.

Fixes: e36be19823f0 ("arm64: dts: mediatek: mt8188-geralt: Enable first SCP core")
Signed-off-by: Justin Yeh <justin.yeh@mediatek.com>
---
 arch/arm64/boot/dts/mediatek/mt8188-geralt.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/mediatek/mt8188-geralt.dtsi b/arch/arm64/boot/dts/mediatek/mt8188-geralt.dtsi
index f382f90c48f5..35f60b5bba6f 100644
--- a/arch/arm64/boot/dts/mediatek/mt8188-geralt.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8188-geralt.dtsi
@@ -166,7 +166,7 @@ reserved_memory: reserved-memory {
 
 		scp_mem_reserved: memory@50000000 {
 			compatible = "shared-dma-pool";
-			reg = <0 0x50000000 0 0x800000>;
+			reg = <0 0x50000000 0 0x900000>;
 			no-map;
 		};
 
-- 
2.45.2



             reply	other threads:[~2026-08-24  9:04 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-08-24  9:04 Justin Yeh [this message]
2026-08-24  9:12 ` [PATCH] arm64: dts: mediatek: mt8188-geralt: Enlarge SCP core0 memory region Chen-Yu Tsai
2026-09-10  7:39 ` AngeloGioacchino Del Regno

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