linux-kernel - Re: [PATCH v3 2/4] firmware: qcom

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Message-ID: <20230816170232.GA26279@quicinc.com>
Date:   Wed, 16 Aug 2023 10:02:33 -0700
From:   Guru Das Srinagesh <quic_gurus@...cinc.com>
To:     Robert Marko <robimarko@...il.com>
CC:     <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_mojha@...cinc.com>,
        <computersforpeace@...il.com>
Subject: Re: [PATCH v3 2/4] firmware: qcom_scm: disable SDI if required

On Aug 16 2023 18:45, Robert Marko wrote:
> IPQ5018 has SDI (Secure Debug Image) enabled by TZ by default, and that
> means that WDT being asserted or just trying to reboot will hang the board
> in the debug mode and only pulling the power and repowering will help.
> Some IPQ4019 boards like Google WiFI have it enabled as well.
> 
> Luckily, SDI can be disabled via an SCM call.
> 
> So, lets use the boolean DT property to identify boards that have SDI
> enabled by default and use the SCM call to disable SDI during SCM probe.
> It is important to disable it as soon as possible as we might have a WDT
> assertion at any time which would then leave the board in debug mode,
> thus disabling it during SCM removal is not enough.
> 
> Signed-off-by: Robert Marko <robimarko@...il.com>

Reviewed-by: Guru Das Srinagesh <quic_gurus@...cinc.com>