linux-kernel - Re: [PATCH v11 0/4] iommu/arm-smmu: Add runtime pm/sleep support

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Message-ID: <8bda01d5-61aa-d163-3b25-e8b055d54644@codeaurora.org>
Date:   Fri, 18 May 2018 15:44:01 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     Robin Murphy <robin.murphy@....com>,
        Will Deacon <will.deacon@....com>
Cc:     Tomasz Figa <tfiga@...omium.org>,
        "list@....net:IOMMU DRIVERS" <iommu@...ts.linux-foundation.org>,
        Joerg Roedel <joro@...tes.org>, joro@...tes.org,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "list@....net:IOMMU DRIVERS" <iommu@...ts.linux-foundation.org>,
        Joerg Roedel <joro@...tes.org>,
        iommu@...ts.linux-foundation.org, devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Rob Clark <robdclark@...il.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Sricharan R <sricharan@...eaurora.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Archit Taneja <architt@...eaurora.org>,
        Lukas Wunner <lukas@...ner.de>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v11 0/4] iommu/arm-smmu: Add runtime pm/sleep support

Hi Robin,


On 4/9/2018 9:52 AM, Tomasz Figa wrote:
> Hi Will, Robin,
>
> On Thu, Mar 22, 2018 at 7:22 PM Vivek Gautam <vivek.gautam@...eaurora.org>
> wrote:
>
>> This series provides the support for turning on the arm-smmu's
>> clocks/power domains using runtime pm. This is done using the
>> recently introduced device links patches, which lets the smmu's
>> runtime to follow the master's runtime pm, so the smmu remains
>> powered only when the masters use it.
>> As not all implementations support clock/power gating, we are checking
>> for a valid 'smmu->dev's pm_domain' to conditionally enable the runtime
>> power management for such smmu implementations that can support it.
>> This series also adds support for Qcom's arm-smmu-v2 variant that
>> has different clocks and power requirements.
>> Took some reference from the exynos runtime patches [1].
>> With conditional runtime pm now, we avoid touching dev->power.lock
>> in fastpaths for smmu implementations that don't need to do anything
>> useful with pm_runtime.
>> This lets us to use the much-argued pm_runtime_get_sync/put_sync()
>> calls in map/unmap callbacks so that the clients do not have to
>> worry about handling any of the arm-smmu's power.
>> Previous version of this patch series is @ [5].
>> [v11]
>>      * Some more cleanups for device link. We don't need an explicit
>>        delete for device link from the driver, but just set the flag
>>        DL_FLAG_AUTOREMOVE.
>>        device_link_add() API description says -
>>        "If the DL_FLAG_AUTOREMOVE is set, the link will be removed
>>        automatically when the consumer device driver unbinds."
>>      * Addressed the comments for 'smmu' in arm_smmu_map/unmap().
>>      * Dropped the patch [10] that introduced device_link_del_dev() API.
> As far as I can see, this version addresses all the earlier comments. Do
> you think this is something that you could apply?
>
> Best regards,
> Tomasz

Gentle ping. Are we picking this series for 4.18?

Regards
Vivek