linux-kernel - Re: [PATCH 1/2] mmc: mtk-sd: add Inline Crypto Engine support

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Message-ID: <b557604932edfcd9847f0f033f410b7a68c704dc.camel@mediatek.com>
Date:   Mon, 31 Oct 2022 09:50:39 +0000
From:   Mengqi Zhang (张梦琦) 
        <Mengqi.Zhang@...iatek.com>
To:     "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        Wenbin Mei (梅文彬) 
        <Wenbin.Mei@...iatek.com>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        Chaotian Jing (井朝天) 
        <Chaotian.Jing@...iatek.com>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>
CC:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/2] mmc: mtk-sd: add Inline Crypto Engine support

On Tue, 2022-10-18 at 11:50 +0200, AngeloGioacchino Del Regno wrote:
> Il 17/10/22 16:20, Mengqi Zhang ha scritto:
> > add crypto clock control and ungate it before CQHCI init.
> > 
> > Signed-off-by: Mengqi Zhang <mengqi.zhang@...iatek.com>
> 
> Hello Mengqi,
> I'm a bit surprised that enabling ICE only requires enabling a clock
> as
> on downstream code I see some SMC calls to
> MTK_SIP_KERNEL_HW_FDE_MSDC_CTL.
> 
> Can you please explain why SMC calls are not needed here?
> 
> Thanks,
> Angelo
> 

Hi Angelo,

There are many wrong quotes in previous reply, let me fix it here.

In some MTK SoC, we need set a encrypto enable bit
MTK_SIP_KERNEL_HW_FDE_MSDC_CTL in secure world, so we use SMC call to
finish it.
But not every MTK SoC need to set this bit in secure world. This patch
is for these SoCs.
As for SMC call, we haven't found a proper way to deal with it, we'll
do it later.

Thanks,
Mengqi.Zhang