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

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Date:   Thu, 16 Mar 2023 00:23:52 +0000
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        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>,
        Judy Hsiao <judyhsiao@...omium.org>
Subject: Re: [PATCH v3 1/4] arm64: dts: qcom: sc7180: Don't enable lpass
 clocks by default

On Wed, Mar 15, 2023 at 05:06:04PM -0700, Doug Anderson wrote:
> 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.

I don't know about the history of audio on the IDP either, I share Doug's
assessment that it looks like it was never supported.

> > 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 */
> > >               };
> > >       };
> > >