linux-kernel - Re: [PATCH v3 1/4] arm64: dts: qcom: sc7180: Don't enable lpass clocks by default

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Date:   Wed, 15 Mar 2023 17:06:04 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     Nikita Travkin <nikita@...n.ru>, agross@...nel.org,
        andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht,
        Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        Judy Hsiao <judyhsiao@...omium.org>
Subject: Re: [PATCH v3 1/4] arm64: dts: qcom: sc7180: Don't enable lpass
 clocks by default

Hi,

On Wed, Mar 15, 2023 at 9:12 AM Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
>
>
>
> On 15.03.2023 16:43, Nikita Travkin wrote:
> > lpass clocks are usually blocked from HLOS by the firmware and
> > instead are managed by the ADSP. Mark them as reserved and explicitly
> > enable in the CrOS boards that have special, cooperative firmware.
> >
> > Signed-off-by: Nikita Travkin <nikita@...n.ru>
> > ---
> +CC Doug
>
> Please confirm whether this also applies to IDP (in which case
> this would have been a bugfix).

Thanks for the CC! Actually, Judy (and maybe Matthias) might be
better. The audio stuff makes my head spin a little bit and I know
they've kept track of it much better than I have. If they don't have
time, I can dig more into it myself. I also added Srinivasa just in
case.

In general, though, I think people at Google don't interact with IDP
very much. It's a reference board from Qualcomm and not the right form
factor. It also doesn't support most of the tooling that folks at
Google on the ChromeOS team expect. I don't know if audio was ever
really supported on IDP. Probably not since there's no "sound" node in
the IDP device tree file.


> Konrad
> >  arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 8 ++++++++
> >  arch/arm64/boot/dts/qcom/sc7180.dtsi         | 4 ++++
> >  2 files changed, 12 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> > index 423630c4d02c..26def6e12723 100644
> > --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> > @@ -785,6 +785,14 @@ alc5682: codec@1a {
> >       };
> >  };
> >
> > +&lpasscc {
> > +     status = "okay";
> > +};
> > +
> > +&lpass_hm {
> > +     status = "okay";
> > +};
> > +
> >  &lpass_cpu {
> >       status = "okay";
> >
> > diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> > index 53f0076f20f6..f0de177981f9 100644
> > --- a/arch/arm64/boot/dts/qcom/sc7180.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> > @@ -3623,6 +3623,8 @@ lpasscc: clock-controller@...00000 {
> >                       power-domains = <&lpass_hm LPASS_CORE_HM_GDSCR>;
> >                       #clock-cells = <1>;
> >                       #power-domain-cells = <1>;
> > +
> > +                     status = "reserved"; /* Controlled by ADSP */
> >               };
> >
> >               lpass_cpu: lpass@...87000 {
> > @@ -3671,6 +3673,8 @@ lpass_hm: clock-controller@...00000 {
> >
> >                       #clock-cells = <1>;
> >                       #power-domain-cells = <1>;
> > +
> > +                     status = "reserved"; /* Controlled by ADSP */
> >               };
> >       };
> >