linux-kernel - Re: [PATCH v4 3/3] iommu: arm-smmu-impl: Add sdm845 implementation hook

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Message-ID: <f61884eb2b71fe90a8b5dda6c33b1c9d@codeaurora.org>
Date:   Mon, 16 Sep 2019 15:17:52 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Vivek Gautam <vivek.gautam@...eaurora.org>, agross@...nel.org,
        iommu@...ts.linux-foundation.org, joro@...tes.org,
        robin.murphy@....com, will.deacon@....com,
        bjorn.andersson@...aro.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm-owner@...r.kernel.org
Subject: Re: [PATCH v4 3/3] iommu: arm-smmu-impl: Add sdm845 implementation
 hook

Hi Stephen,

On 2019-09-06 20:37, Stephen Boyd wrote:
> 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)
>>  {

Have addressed all your comments in v5.

Thanks,
Sai

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