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SubjectRe: [PATCH v4 3/3] iommu: arm-smmu-impl: Add sdm845 implementation hook
Date
Quoting Vivek Gautam (2019-08-22 23:32:48)
> diff --git a/drivers/iommu/arm-smmu-impl.c b/drivers/iommu/arm-smmu-impl.c
> index 3f88cd078dd5..0aef87c41f9c 100644
> --- a/drivers/iommu/arm-smmu-impl.c
> +++ b/drivers/iommu/arm-smmu-impl.c
> @@ -102,7 +103,6 @@ static struct arm_smmu_device *cavium_smmu_impl_init(struct arm_smmu_device *smm
> return &cs->smmu;
> }
>
> -
> #define ARM_MMU500_ACTLR_CPRE (1 << 1)
>
> #define ARM_MMU500_ACR_CACHE_LOCK (1 << 26)

Drop this hunk?

> @@ -147,6 +147,28 @@ static const struct arm_smmu_impl arm_mmu500_impl = {
> .reset = arm_mmu500_reset,
> };
>
> +static int qcom_sdm845_smmu500_reset(struct arm_smmu_device *smmu)
> +{
> + int ret;
> +
> + arm_mmu500_reset(smmu);
> +
> + /*
> + * To address performance degradation in non-real time clients,
> + * such as USB and UFS, turn off wait-for-safe on sdm845 based boards,
> + * such as MTP and db845, whose firmwares implement secure monitor
> + * call handlers to turn on/off the wait-for-safe logic.
> + */
> + ret = qcom_scm_qsmmu500_wait_safe_toggle(0);
> + if (ret)
> + dev_warn(smmu->dev, "Failed to turn off SAFE logic\n");
> +
> + return 0;

return ret? Or intentionally don't return an error for failure?

> +}
> +
> +const struct arm_smmu_impl qcom_sdm845_smmu500_impl = {

static?

> + .reset = qcom_sdm845_smmu500_reset,
> +};
>
> struct arm_smmu_device *arm_smmu_impl_init(struct arm_smmu_device *smmu)
> {

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