linux-kernel - Re: [PATCH v2 05/11] clk: qcom: gcc-msm8998: Mark gpu_cfg_ahb

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Message-ID: <CAOCk7NoVts21FjhhLtZp-0Xdw6-BnrKio_-tuZBRsgapsUdwfw@mail.gmail.com>
Date:   Thu, 14 Jan 2021 15:37:20 -0700
From:   Jeffrey Hugo <jeffrey.l.hugo@...il.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>
Cc:     MSM <linux-arm-msm@...r.kernel.org>, konrad.dybcio@...ainline.org,
        marijn.suijten@...ainline.org, martin.botka@...ainline.org,
        phone-devel@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, linux-clk@...r.kernel.org,
        DTML <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 05/11] clk: qcom: gcc-msm8998: Mark gpu_cfg_ahb_clk as critical

On Thu, Jan 14, 2021 at 3:13 PM AngeloGioacchino Del Regno
<angelogioacchino.delregno@...ainline.org> wrote:
>
> The GPU IOMMU depends on this clock and the hypervisor will crash
> the SoC if this clock gets disabled because the secure contexts
> that have been set on this IOMMU by the bootloader will become
> unaccessible (or they get reset).
> Mark this clock as critical to avoid this issue when the Adreno
> GPU is enabled.
>

You should go review the last attempt to do this -
https://lkml.org/lkml/2019/12/17/881