Re: [PATCH 1/2] arm64: dts: qcom: agatti: Fix IOMMU DT properties

[Vikash Garodia]

On 12/29/2025 12:50 PM, Sumit Garg wrote:
> Hey Everyone,
>
> On Mon, Dec 29, 2025 at 12:37 PM Sumit Garg <sumit.garg@xxxxxxxxxxxxxxxx> wrote:
> > Fix IOMMU DT propeties for GPU, display and video peripherals via
> > dropping SMMU stream IDs which relates to secure context bank.
> >
> > This problem only surfaced when the Gunyah based firmware stack is
> > ported on Agatti replacing the legacy QHEE based firmware stack. Assigning
> > Linux kernel (HLOS) VMID to secure context bank stream IDs is treated
> > as a fault by Gunyah hypervisor which were previously ignored by QHEE
> > hypervisor.
> >
> > The DT changes should be backwards compatible with legacy QHEE based
> > firmware stack too.
> >
> > Suggested-by: Prakash Gupta <guptap@xxxxxxxxxxxxxxxx>
> > Signed-off-by: Sumit Garg <sumit.garg@xxxxxxxxxxxxxxxx>
> > ---
> >   arch/arm64/boot/dts/qcom/agatti.dtsi | 11 +++--------
> >   1 file changed, 3 insertions(+), 8 deletions(-)
>
> Looks like I messed up this patch-set with email delivery leading to
> non-delivery. I resent it properly again here [1]. Apologies for the
> noise.
>
> [1] https://lore.kernel.org/lkml/20251229070712.456138-1-sumit.garg@xxxxxxxxxxxxxxxx/
>
> -Sumit
>
> > diff --git a/arch/arm64/boot/dts/qcom/agatti.dtsi b/arch/arm64/boot/dts/qcom/agatti.dtsi
> > index 8bf5c5583fc2..e705eb24160a 100644
> > --- a/arch/arm64/boot/dts/qcom/agatti.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/agatti.dtsi
> > @@ -1613,8 +1613,7 @@ gpu: gpu@5900000 {
> >                                           &bimc SLAVE_EBI1 RPM_ALWAYS_TAG>;
> >                          interconnect-names = "gfx-mem";
> >
> > -                       iommus = <&adreno_smmu 0 1>,
> > -                                <&adreno_smmu 2 0>;
> > +                       iommus = <&adreno_smmu 0 1>;
> >                          operating-points-v2 = <&gpu_opp_table>;
> >                          power-domains = <&rpmpd QCM2290_VDDCX>;
> >                          qcom,gmu = <&gmu_wrapper>;
> > @@ -1895,8 +1894,7 @@ mdss: display-subsystem@5e00000 {
> >
> >                          power-domains = <&dispcc MDSS_GDSC>;
> >
> > -                       iommus = <&apps_smmu 0x420 0x2>,
> > -                                <&apps_smmu 0x421 0x0>;
> > +                       iommus = <&apps_smmu 0x420 0x2>;
> >                          interconnects = <&mmrt_virt MASTER_MDP0 RPM_ALWAYS_TAG
> >                                           &bimc SLAVE_EBI1 RPM_ALWAYS_TAG>,
> >                                          <&bimc MASTER_APPSS_PROC RPM_ALWAYS_TAG
> > @@ -2339,10 +2337,7 @@ venus: video-codec@5a00000 {
> >
> >                          memory-region = <&pil_video_mem>;
> >                          iommus = <&apps_smmu 0x860 0x0>,
> > -                                <&apps_smmu 0x880 0x0>,
> > -                                <&apps_smmu 0x861 0x04>,
> > -                                <&apps_smmu 0x863 0x0>,
> > -                                <&apps_smmu 0x804 0xe0>;
> > +                                <&apps_smmu 0x880 0x0>;

Are you planning to update the binding [1] with this change ? If so, how 
to handle the case of iommus for gunyah based vs non-gunyah based ?

[1] 
https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/media/qcom%2Cqcm2290-venus.yaml#L45

Regards,
Vikash
> >                          interconnects = <&mmnrt_virt MASTER_VIDEO_P0 RPM_ALWAYS_TAG
> >                                           &bimc SLAVE_EBI1 RPM_ALWAYS_TAG>,
> > --
> > 2.51.0