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

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Message-ID: <20240111044508.GA3761@thinkpad>
Date: Thu, 11 Jan 2024 10:15:08 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...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, 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.

- 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>
> 
> 

-- 
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