linux-kernel - Re: [PATCH 0/4] Add a property to override the quad mode

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 15 Aug 2023 17:59:34 +0200
From:   Michael Walle <michael@...le.cc>
To:     Hsin-Yi Wang <hsinyi@...omium.org>,
        Tudor Ambarus <tudor.ambarus@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Bjorn Andersson <andersson@...nel.org>
CC:     Pratyush Yadav <pratyush@...nel.org>,
        "Miquel Raynal )" <miquel.raynal@...tlin.com>,
        "Richard Weinberger )" <richard@....at>,
        "Vignesh Raghavendra )" <vigneshr@...com>,
        Rob Herring <robh+dt@...nel.org>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        cros-qcom-dts-watchers@...omium.org,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: Re: [PATCH 0/4] Add a property to override the quad mode

Hi, 

>On gigadevice gd25lq64c, the quad mode is enabled after BFPT is parsed.
>According to datasheet[1], Quad enable (QE) bit needs to be set to 0 to
>use write protection (WP) pin. It also recommends setting default value of
>QE to 0 to avoid a potential short issue.

So you are using either dual or single io mode. Why can't you use the device tree property spi-{tx,rx}-bus-width? 

>Add a disable-quad-mode property in devicetree that platform can use it to
>override the quad mode status parsed from BFPT to use write protection.
>
>[1]
>https://www.elm-tech.com/ja/products/spi-flash-memory/gd25lq64/gd25lq64.pdf

should be a link on the vendor Homepage if possible. 

-michael