Re: [PATCH v7 3/3] iommu/arm-smmu-v3: Enable CFGI/TLBI-repeat workaround on Tegra264

[Jason Gunthorpe]

On Tue, Jul 14, 2026 at 10:42:02AM +0000, Ashish Mhetre wrote:

> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> @@ -5357,8 +5357,10 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev,
>  	if (of_dma_is_coherent(dev->of_node))
>  		smmu->features |= ARM_SMMU_FEAT_COHERENCY;
>  
> -	if (of_device_is_compatible(dev->of_node, "nvidia,tegra264-smmu"))
> +	if (of_device_is_compatible(dev->of_node, "nvidia,tegra264-smmu")) {
>  		tegra_cmdqv_dt_probe(dev->of_node, smmu);
> +		static_branch_enable(&arm_smmu_erratum_repeat_tlbi_cfgi_key);
> +	}

It is a bit of a big hammer to not have the per-instance FEAT but it
probably doesn't matter

Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>

Jason