linux-kernel - Re: [PATCH v5 2/4] iommu/mediatek: Adjust mtk_iommu

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Date:   Thu, 22 Dec 2022 10:02:27 +0000
From:   Yong Wu (吴勇) <Yong.Wu@...iatek.com>
To:     "robin.murphy@....com" <robin.murphy@....com>,
        "joro@...tes.org" <joro@...tes.org>,
        "will@...nel.org" <will@...nel.org>,
        Chengci Xu (许承赐) 
        <Chengci.Xu@...iatek.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>
Subject: Re: [PATCH v5 2/4] iommu/mediatek: Adjust mtk_iommu_config flow

On Mon, 2022-12-05 at 17:49 +0800, Chengci.Xu wrote:
> For reduce indention without functional change, prepare for MT8188.
> If there are many port in a same larb, current flow will update
> larb_mmu->mmu or update INFRA register for too many times.
> So we save all port to portid_msk in the front of mtk_iommu_config(),

s/port/ports/g

> and then update only once for IOMMU configure. By this modification,
> we can prevent MT8188 from sending to many SMC calls, avoiding enter
> ATF for each port.
> 
> Signed-off-by: Chengci.Xu <chengci.xu@...iatek.com>

Reviewed-by: Yong Wu <yong.wu@...iatek.com>