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

Joy Zou posted 1 patch 2 weeks, 5 days ago
There is a newer version of this series
arch/arm64/boot/dts/freescale/imx95.dtsi | 1 +
1 file changed, 1 insertion(+)
[PATCH] arm64: dts: imx95: Reserve eDMA channels 0-1 for V2X
Posted by Joy Zou 2 weeks, 5 days ago 
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@nxp.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@42000000 {
 				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,
-- 
Joy Zou <joy.zou@nxp.com>
Re: [PATCH] arm64: dts: imx95: Reserve eDMA channels 0-1 for V2X
Posted by Frank Li 2 weeks, 5 days ago 
On Tue, Jan 20, 2026 at 04:35:50PM +0800, 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@nxp.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@42000000 {
>  				reg = <0x42000000 0x210000>;
>  				#dma-cells = <3>;
>  				dma-channels = <64>;
> +				dma-channel-mask = <0x3>;

Can you add comments here? v2x needn't dt node?

Frank

>  				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,
> --
> Joy Zou <joy.zou@nxp.com>
>
Re: [PATCH] arm64: dts: imx95: Reserve eDMA channels 0-1 for V2X
Posted by Joy Zou 2 weeks, 4 days ago 
On Tue, Jan 20, 2026 at 11:25:42AM -0500, Frank Li wrote:
> On Tue, Jan 20, 2026 at 04:35:50PM +0800, 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@nxp.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@42000000 {
> >  				reg = <0x42000000 0x210000>;
> >  				#dma-cells = <3>;
> >  				dma-channels = <64>;
> > +				dma-channel-mask = <0x3>;
> 
> Can you add comments here? v2x needn't dt node?
Yes! V2X operates on a dedicated M-core and needn't DT node.
Just reserve the communication channel for V2X.
BR
Joy Zou
> 
> Frank
> 
> >  				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,
> > --
> > Joy Zou <joy.zou@nxp.com>
> >
Re: [PATCH] arm64: dts: imx95: Reserve eDMA channels 0-1 for V2X
Posted by Laurentiu Mihalcea 2 weeks, 5 days ago 
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@nxp.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@42000000 {
>  				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@nxp.com>

Tested-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com> # MX95-15x15-FRDM, MX95-19x19-EVK
Re: [PATCH] arm64: dts: imx95: Reserve eDMA channels 0-1 for V2X
Posted by Joy Zou 2 weeks, 4 days ago 
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@nxp.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@42000000 {
> >  				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@nxp.com>
> 
> Tested-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com> # MX95-15x15-FRDM, MX95-19x19-EVK
>

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