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

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Message-ID: <20260121062755.GA2474386@shlinux88>
Date: Wed, 21 Jan 2026 14:27:55 +0800
From: Joy Zou <joy.zou@....com>
To: Laurentiu Mihalcea <laurentiumihalcea111@...il.com>
Cc: 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>,
	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 Tue, Jan 20, 2026 at 04:30:32AM -0800, Laurentiu Mihalcea wrote:
> 
> 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.
Will change imx95-19x19-evk-sof.dts.
BR
Joy Zou
> 
> 
> Either way:
> 
> Reviewed-by: Laurentiu Mihalcea <laurentiu.mihalcea@....com>
> 
> Tested-by: Laurentiu Mihalcea <laurentiu.mihalcea@....com> # MX95-15x15-FRDM, MX95-19x19-EVK
>