linux-kernel - Re: [PATCH v2 3/4] arm64: dts: qcom: sdm845: Add the RPMh stats node

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Date:   Tue, 16 Aug 2022 13:30:49 +0300
From:   Abel Vesa <abel.vesa@...aro.org>
To:     Caleb Connolly <caleb.connolly@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Maulik Shah <quic_mkshah@...cinc.com>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/4] arm64: dts: qcom: sdm845: Add the RPMh stats node

On 22-08-15 21:34:07, Caleb Connolly wrote:
> 
> 
> On 12/08/2022 11:12, Abel Vesa wrote:
> > SDM845 is a special case compared to the other platforms that use RPMh
> > stats, since it only has 2 stats (aosd and cxsd), while the others have
> > a 3rd one (ddr).
> > 
> > So lets add the node but with a SDM845 dedicated compatible to make
> > the driver aware of the different stats config.
> Hi,
> 
> I gave this a go on the OnePlus 6, I noticed the driver is also meant to
> read the stats for remote procs via smem, however this seems to fail for me
> - it can't find any of the SMEM items even if I probe the driver manually
> after ensuring remoteprocs have booted. Is this an unsupported feature on
> SDM845?

Thanks for giving it a test.

Actually, you need to probe the qcom_stats after the remoteprocs have
booted.

Doing so, you'll end up having the following:
adsp  aosd  cdsp  cxsd

> > 
> > Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> > ---
> > 
> > Changed qcom,rpmh-stats-sdm845 to qcom,sdm845-rpmh-stats, as suggested
> > by Krzysztof.
> > 
> >   arch/arm64/boot/dts/qcom/sdm845.dtsi | 5 +++++
> >   1 file changed, 5 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> > index 5bea96a9ce06..67fe08b837be 100644
> > --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> > @@ -4851,6 +4851,11 @@ ebi_cdev: ebi {
> >   			};
> >   		};
> > 
> > +		sram@...0000 {
> > +			compatible = "qcom,sdm845-rpmh-stats";
> > +			reg = <0 0x0c3f0000 0 0x400>;
> > +		};
> > +
> >   		spmi_bus: spmi@...0000 {
> >   			compatible = "qcom,spmi-pmic-arb";
> >   			reg = <0 0x0c440000 0 0x1100>,
> > --
> > 2.34.1
> > 
> 
> -- 
> Kind Regards,
> Caleb (they/he)