linux-kernel - Re: [PATCH -next v4 2/2] iommu/arm-smmu-v3: Add suspend and resume support

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Date:   Mon, 30 Aug 2021 15:57:08 +0800
From:   Bixuan Cui <cuibixuan@...wei.com>
To:     <iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>
CC:     <will@...nel.org>, <gregkh@...uxfoundation.org>,
        <rafael@...nel.org>, <robin.murphy@....com>, <joro@...tes.org>,
        <jean-philippe@...aro.org>, <Jonathan.Cameron@...wei.com>,
        <thunder.leizhen@...wei.com>, <maz@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH -next v4 2/2] iommu/arm-smmu-v3: Add suspend and resume
 support



On 2021/8/30 15:38, Bixuan Cui wrote:
> Changes in v4:
> * Restore the arm_smmu_suspend() function code to the v2 version(Directly return 0 in it).
Hello,
I looked up the code of smmu.c and the manual of smmu v3. For the suspend is implemented
by the external clock-gating, it is not clear what the SMMUv3 needs to do. Is it the same
as that in smmu.c?
I roll back the code here, and hope to get some advice.

Thanks,
Bixuan Cui