linux-kernel - Re: [PATCH v2 0/6] arm64: dts: qcom: Fix broken regulator spec on RPMH boards

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Date:   Thu, 8 Sep 2022 09:04:48 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Bjorn Andersson <andersson@...nel.org>
Cc:     Johan Hovold <johan@...nel.org>,
        Andrew Halaney <ahalaney@...hat.com>,
        Mark Brown <broonie@...nel.org>,
        Andy Gross <agross@...nel.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>,
        Johan Hovold <johan+linaro@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Vinod Koul <vkoul@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/6] arm64: dts: qcom: Fix broken regulator spec on
 RPMH boards

Bjorn,

On Mon, Aug 29, 2022 at 9:50 AM Douglas Anderson <dianders@...omium.org> wrote:
>
> Prior to commit efb0cb50c427 ("regulator: qcom-rpmh: Implement
> get_optimum_mode(), not set_load()") several boards were able to
> change their regulator mode even though they had nothing listed in
> "regulator-allowed-modes". After that commit (and fixes [1]) we'll be
> stuck at the initial mode. Discussion of this (again, see [1]) has
> resulted in the decision that the old dts files were wrong and should
> be fixed to fully restore old functionality.
>
> This series attempts to fix everyone. I've kept each board in a
> separate patch to make stable / backports work easier.
>
> Affected boards were found with:
>   rpmh_users=$(git grep -l -i rpmh -- arch/arm*/boot/dts/qcom)
>   set_modes=$(grep -l regulator-allow-set-load ${rpmh_users})
>   but_no_allowed_modes=$(grep -l -v regulator-allowed-modes ${set_modes})
>
> Fix was applied with:
>   for f in ${but_no_allowed_modes}; do
>     sed -i~ -e \
>       's/^\(\s*\)regulator-allow-set-load;/\1regulator-allow-set-load;\n\1regulator-allowed-modes =\n\1    <RPMH_REGULATOR_MODE_LPM\n\1     RPMH_REGULATOR_MODE_HPM>;/'\
>       $f
>   done
>
> Then results were manually inspected. In one board I removed a
> "regulator-allow-set-load" from a fixed regulator since that was
> clearly wrong.
>
> v2 of this series adds tags and also rebases atop Johan's series [2]
> as requested [3]. This ends up turning the series into a 6-part series
> instead of a 7-part one.
>
> It should also be noted that as of the v2 posting that the related
> regulator fixes have all landed in the regulator tree.
>
> [1] https://lore.kernel.org/r/20220824142229.RFT.v2.2.I6f77860e5cd98bf5c67208fa9edda4a08847c304@changeid
> [2] https://lore.kernel.org/r/20220803121942.30236-1-johan+linaro@kernel.org/
> [3] https://lore.kernel.org/r/YwhwIX+Ib8epUYWS@hovoldconsulting.com/
>
> Changes in v2:
> - Added note about removing regulator-allow-set-load from vreg_s4a_1p8
> - Rebased atop ("...: sa8295p-adp: disallow regulator mode switches")
> - Rebased atop ("...: sc8280xp-crd: disallow regulator mode switches")
>
> Douglas Anderson (6):
>   arm64: dts: qcom: sa8155p-adp: Specify which LDO modes are allowed
>   arm64: dts: qcom: sa8295p-adp: Specify which LDO modes are allowed
>   arm64: dts: qcom: sc8280xp-crd: Specify which LDO modes are allowed
>   arm64: dts: qcom: sm8150-xperia-kumano: Specify which LDO modes are
>     allowed
>   arm64: dts: qcom: sm8250-xperia-edo: Specify which LDO modes are
>     allowed
>   arm64: dts: qcom: sm8350-hdk: Specify which LDO modes are allowed
>
>  arch/arm64/boot/dts/qcom/sa8155p-adp.dts            | 13 ++++++++++++-
>  arch/arm64/boot/dts/qcom/sa8295p-adp.dts            | 12 ++++++++++++
>  arch/arm64/boot/dts/qcom/sc8280xp-crd.dts           |  6 ++++++
>  .../boot/dts/qcom/sm8150-sony-xperia-kumano.dtsi    |  6 ++++++
>  .../arm64/boot/dts/qcom/sm8250-sony-xperia-edo.dtsi |  6 ++++++
>  arch/arm64/boot/dts/qcom/sm8350-hdk.dts             | 12 ++++++++++++
>  6 files changed, 54 insertions(+), 1 deletion(-)

I think this series is ready to land if it's a good time now. It looks
like you've already applied the series that this depends on [1] and
this one is all reviewed and ready to go. Thanks!

[1] https://lore.kernel.org/all/166181675980.322065.3918715363441736917.b4-ty@kernel.org/