Re: [PATCH 1/2] arm64: dts: imx8qm-ss-conn: add usbotg3 iommu information

[Frank Li]

On Wed, Oct 28, 2026 at 08:44:21PM +0100, Emanuele Ghidoli wrote:
>
>
> On 7/20/26 23:10, Frank.Li@xxxxxxxxxxx wrote:
> > From: Frank Li <Frank.Li@xxxxxxx>
> >
> > Add usbotg3 iommu information.
> >
> > Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
> > ---
> >  arch/arm64/boot/dts/freescale/imx8qm-ss-conn.dtsi | 4 ++++
> >  1 file changed, 4 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/freescale/imx8qm-ss-conn.dtsi b/arch/arm64/boot/dts/freescale/imx8qm-ss-conn.dtsi
> > index ccf9f510e0f88..1370a571153a5 100644
> > --- a/arch/arm64/boot/dts/freescale/imx8qm-ss-conn.dtsi
> > +++ b/arch/arm64/boot/dts/freescale/imx8qm-ss-conn.dtsi
> > @@ -32,3 +32,7 @@ &usdhc3 {
> >  	compatible = "fsl,imx8qm-usdhc", "fsl,imx8qxp-usdhc", "fsl,imx7d-usdhc";
> >  	iommus = <&smmu 0x11 0x7f80>;
> >  };
> > +
> > +&usbotg3_cdns3 {
> > +	iommus = <&smmu 0x4 0x7f80>;
> > +};
> >
>
> Hello Frank,
>
> this patch, now in mainline as 73c3b40e536d, breaks USB 3.0 on Apalis iMX8QM
> (both on Ixora and on the Apalis Evaluation Board). Right after xHCI starts:
>
>   xhci-hcd xhci-hcd.1.auto: Host supports USB 3.0 SuperSpeed
>   xhci-hcd xhci-hcd.1.auto: WARNING: Host System Error
>   ...
>   xhci-hcd xhci-hcd.1.auto: xHCI host controller not responding, assume dead
>   xhci-hcd xhci-hcd.1.auto: HC died; cleaning up
>
> SuperSpeed devices no longer enumerate, and no SMMU fault is reported.
> Reverting only this commit on top of current master fixes it. The other commit
> seems fine.

Does it only impact superspeed? High speed work?

Frank
>
> Adding the same property to the parent as well, like the NXP downstream tree
> does, also fixes it:
>
> &usbotg3 {
> 	iommus = <&smmu 0x4 0x7f80>;
> };
>
> With that, SuperSpeed devices enumerate again.
>
> Could you please take care of a fix? Otherwise I think we should revert this
> patch.
>
> #regzbot introduced: 73c3b40e536d
>
> Thanks,
> Emanuele