[PATCH v2 3/6] arm64: dts: qcom: kodiak: Add GEM_NOC interconnect for adreno SMMU

[Dmitry Baryshkov]

On Tue, May 26, 2026 at 08:12:04PM +0530, Bibek Kumar Patro wrote:
> On Kodiak platforms, the Adreno SMMU requires a bandwidth vote on
> the GEM_NOC path (MASTER_GPU_TCU -> SLAVE_EBI1) before its registers
> are accessible. Without this vote, the SMMU may become unreachable,
> leading to intermittent probe failures and runtime issues.
> 
> Add the required interconnect to ensure reliable register access.

Does it only concern the GPU SMMU? What about the APPS SMMU? Should it
be voting on other interconnects too? I guess so, because currently I
see that TBUs vote for various interconnects. BTW: should apps_smmu also
vote on the power domains?

> 
> Signed-off-by: Bibek Kumar Patro <bibek.patro at oss.qualcomm.com>
> ---
>  arch/arm64/boot/dts/qcom/kodiak.dtsi | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/kodiak.dtsi b/arch/arm64/boot/dts/qcom/kodiak.dtsi
> index fa540d8c2615dc02d941eb16bc7253204c2750bd..eefa4b836a81374ff437ab4bbcbc3fecc1590ab6 100644
> --- a/arch/arm64/boot/dts/qcom/kodiak.dtsi
> +++ b/arch/arm64/boot/dts/qcom/kodiak.dtsi
> @@ -3386,6 +3386,8 @@ adreno_smmu: iommu at 3da0000 {
>  
>  			power-domains = <&gpucc GPU_CC_CX_GDSC>;
>  			dma-coherent;
> +			interconnects = <&gem_noc MASTER_GPU_TCU QCOM_ICC_TAG_ALWAYS
> +					 &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ALWAYS>;
>  		};
>  
>  		gfx_0_tbu: tbu at 3dd9000 {
> 
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry