Re: [PATCH] arm64: dts: mediatek: mt8188-geralt: Enlarge SCP core0 memory region

[Chen-Yu Tsai]

On Mon, Aug 24, 2026 at 5:04 PM Justin Yeh <justin.yeh@xxxxxxxxxxxx> wrote:
>
> 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@xxxxxxxxxxxx>

Reviewed-by: Chen-Yu Tsai <wenst@xxxxxxxxxxxx>

> ---
>  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
>