linux-kernel - Re: [PATCH] arm64: dts: imx95: Reserve eDMA channels 0-1 for V2X

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Message-ID: <993363fb-8ce4-4a89-b6c4-8fbf181ad410@gmail.com>
Date: Tue, 20 Jan 2026 04:30:32 -0800
From: Laurentiu Mihalcea <laurentiumihalcea111@...il.com>
To: Joy Zou <joy.zou@....com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
 Sascha Hauer <s.hauer@...gutronix.de>,
 Pengutronix Kernel Team <kernel@...gutronix.de>,
 Fabio Estevam <festevam@...il.com>, Frank Li <Frank.Li@....com>,
 Peng Fan <peng.fan@....com>, Ye Li <ye.li@....com>
Cc: devicetree@...r.kernel.org, imx@...ts.linux.dev,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: imx95: Reserve eDMA channels 0-1 for V2X


On 1/20/2026 12:35 AM, Joy Zou wrote:
> Reserve eDMA channels 0 and 1 on the AXI eDMA controller for exclusive
> use by V2X (Vehicle-to-Everything) fast hash operations.
>
> Signed-off-by: Joy Zou <joy.zou@....com>
> ---
> ---
>  arch/arm64/boot/dts/freescale/imx95.dtsi | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx95.dtsi b/arch/arm64/boot/dts/freescale/imx95.dtsi
> index 55e2da094c889fc7c1096d0e36f31ae118d2a982..24d02aa18b2f480bbffdc30bc41c658fb3aaf67a 100644
> --- a/arch/arm64/boot/dts/freescale/imx95.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx95.dtsi
> @@ -631,6 +631,7 @@ edma2: dma-controller@...00000 {
>  				reg = <0x42000000 0x210000>;
>  				#dma-cells = <3>;
>  				dma-channels = <64>;
> +				dma-channel-mask = <0x3>;
>  				interrupts = <GIC_SPI 128 IRQ_TYPE_LEVEL_HIGH>,
>  					     <GIC_SPI 128 IRQ_TYPE_LEVEL_HIGH>,
>  					     <GIC_SPI 129 IRQ_TYPE_LEVEL_HIGH>,
>
> ---
> base-commit: d08c85ac8894995d4b0d8fb48d2f6a3e53cd79ab
> change-id: 20260120-b4-imx95-v2x-3e01c7bc6881
>
> Best regards,


Thanks, this fixes the kernel panics on MX95-15x15-FRDM and MX95-19x19-EVK after

AP access is removed from said channels via SM.


Just one thing: can you do this change for imx95-19x19-evk-sof.dts as well?

If not, I'll just send a patch for that later on.


Either way:

Reviewed-by: Laurentiu Mihalcea <laurentiu.mihalcea@....com>

Tested-by: Laurentiu Mihalcea <laurentiu.mihalcea@....com> # MX95-15x15-FRDM, MX95-19x19-EVK