linux-kernel - Re: [PATCH v9 5/5] iommu/arm-smmu: Add support for qcom,smmu-v2 variant

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Message-ID: <65a57964-805b-3a38-71a2-0c383af30539@huawei.com>
Date:   Wed, 11 Apr 2018 09:22:05 +0800
From:   Yisheng Xie <xieyisheng1@...wei.com>
To:     Tomasz Figa <tfiga@...omium.org>
CC:     Vivek Gautam <vivek.gautam@...eaurora.org>,
        Mark Rutland <mark.rutland@....com>,
        <devicetree@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Will Deacon <will.deacon@....com>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        "list@....net:IOMMU DRIVERS" <iommu@...ts.linux-foundation.org>,
        Joerg Roedel <joro@...tes.org>,
        <iommu@...ts.linux-foundation.org>, <gaojianbo@...ilicon.com>
Subject: Re: [PATCH v9 5/5] iommu/arm-smmu: Add support for qcom,smmu-v2
 variant

Hi Tomasz,

On 2018/4/10 21:14, Tomasz Figa wrote:
> Hi Yisheng,
> 
> Sorry, I think we missed your question here.
> 
> On Wed, Mar 28, 2018 at 3:12 PM Yisheng Xie <xieyisheng1@...wei.com> wrote:
> 
>> Hi Vivek,
> 
>> On 2018/3/28 12:37, Vivek Gautam wrote:
>>> Hi Yisheng
>>>
>>>
>>> On 3/28/2018 6:54 AM, Yisheng Xie wrote:
>>>> Hi Vivek,
>>>>
>>>> On 2018/3/13 16:55, Vivek Gautam wrote:
>>>>> +- power-domains:  Specifiers for power domains required to be
> powered on for
>>>>> +                  the SMMU to operate, as per generic power domain
> bindings.
>>>>> +
>>>> In this patchset, power-domains is not used right? And you just do the
> clock gating,
>>>> but not power gating, right?
>>>
>>> We are handling the power-domains too. Please see the example in this
> binding doc.
> 
>> I see, but I do not find the point in code of these patchset, do you mean
> PMIC(e.g mmcc)
>> will gate the power domain of SMMU(e.g. MDSS_GDSC of mmcc) when PMIC
> suspend?
> 
> 
> If respective SoC power domains is registered as a standard genpd PM
> domain, then the runtime PM subsystem will take care of power domain
> control at runtime suspend and resume.
> 

Get it, thanks for your explain, I should have learned about this.

Thanks
Yisheng

> Best regards,
> Tomasz
> 
> .
>