linux-kernel - Re: [PATCH] arm64: dts: qcom: qrb2210-rb1: disable cluster power domains

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Date: Thu, 11 Jan 2024 08:02:32 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: qrb2210-rb1: disable cluster power domains

On Thu, 11 Jan 2024 at 06:45, Manivannan Sadhasivam
<manivannan.sadhasivam@...aro.org> wrote:
>
> On Thu, Jan 11, 2024 at 04:01:14AM +0200, Dmitry Baryshkov wrote:
> > If cluster domain idle state is enabled on the RB1, the board becomes
> > significantly less responsive. Under certain circumstances (if some of
> > the devices are disabled in kernel config) the board can even lock up.
> >
> > It seems this is caused by the MPM not being pinged during CPU idle (in
> > the same way the RPMh is pinged when cluster idle is entered).
> >
>
> What does "ping" mean here? Please be more specific.

See rpmh_rsc_pd_callback(), rpmh_flush() and rpmh_rsc_write_next_wakeup().

RPMh driver (among other things) on entering the idle writes the next
wake up time to the RPMh. The MPM driver in the vendor kernel does the
same, see msm_mpm_timer_write() in msm-4.19

>
> - Mani
>
> > Disable cluster domain idle for the RB1 board until MPM driver is fixed
> > to cooperate with the CPU idle states.
> >
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> > ---
> >  arch/arm64/boot/dts/qcom/qrb2210-rb1.dts | 18 ++++++++++++++++++
> >  1 file changed, 18 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts b/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts
> > index aa53b6af6d9c..9a0308ef8b0f 100644
> > --- a/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts
> > +++ b/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts
> > @@ -177,6 +177,24 @@ vph_pwr: regulator-vph-pwr {
> >       };
> >  };
> >
> > +&CPU_PD0 {
> > +     /delete-property/ power-domains;
> > +};
> > +
> > +&CPU_PD1 {
> > +     /delete-property/ power-domains;
> > +};
> > +
> > +&CPU_PD2 {
> > +     /delete-property/ power-domains;
> > +};
> > +
> > +&CPU_PD3 {
> > +     /delete-property/ power-domains;
> > +};
> > +
> > +/delete-node/ &CLUSTER_PD;
> > +
> >  &gpi_dma0 {
> >       status = "okay";
> >  };
> >
> > ---
> > base-commit: 39676dfe52331dba909c617f213fdb21015c8d10
> > change-id: 20240111-qrb2210-rb1-no-cluster-idle-7bf43b3a0452
> >
> > Best regards,
> > --
> > Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> >
> >
>
> --
> மணிவண்ணன் சதாசிவம்



-- 
With best wishes
Dmitry