linux-kernel - Re: [PATCH 1/4] arm64: dts: qcom: sc7180: Add support to skip powering up of ETM

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Date:   Mon, 15 Jun 2020 11:17:55 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Stephen Boyd <swboyd@...omium.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        Suzuki K Poulose <suzuki.poulose@....com>,
        mike.leach@...aro.org, Jonathan Marek <jonathan@...ek.ca>
Subject: Re: [PATCH 1/4] arm64: dts: qcom: sc7180: Add support to skip
 powering up of ETM

On Tue, Jun 09, 2020 at 07:00:28PM +0530, Sai Prakash Ranjan wrote:
> Add "qcom,skip-power-up" property to skip powering up ETM
> on SC7180 SoC to workaround a hardware errata where CPU
> watchdog counter is stopped when ETM power up bit is set
> (i.e., when TRCPDCR.PU = 1).
> 
> Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
> ---
> 
> Depends on ETM driver change here:
>  - https://git.linaro.org/kernel/coresight.git/commit/?h=next-v5.8-rc1&id=159e248e75b1b548276b6571d7740a35cab1f5be 
> 
> ---
>  arch/arm64/boot/dts/qcom/sc7180.dtsi | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> index 7c2b79dda3d7..f684a0b87848 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> @@ -1810,6 +1810,7 @@
>  			clocks = <&aoss_qmp>;
>  			clock-names = "apb_pclk";
>  			arm,coresight-loses-context-with-cpu;
> +			qcom,skip-power-up;
>  
>  			out-ports {
>  				port {
> @@ -1829,6 +1830,7 @@
>  			clocks = <&aoss_qmp>;
>  			clock-names = "apb_pclk";
>  			arm,coresight-loses-context-with-cpu;
> +			qcom,skip-power-up;
>  
>  			out-ports {
>  				port {
> @@ -1848,6 +1850,7 @@
>  			clocks = <&aoss_qmp>;
>  			clock-names = "apb_pclk";
>  			arm,coresight-loses-context-with-cpu;
> +			qcom,skip-power-up;
>  
>  			out-ports {
>  				port {
> @@ -1867,6 +1870,7 @@
>  			clocks = <&aoss_qmp>;
>  			clock-names = "apb_pclk";
>  			arm,coresight-loses-context-with-cpu;
> +			qcom,skip-power-up;
>  
>  			out-ports {
>  				port {
> @@ -1886,6 +1890,7 @@
>  			clocks = <&aoss_qmp>;
>  			clock-names = "apb_pclk";
>  			arm,coresight-loses-context-with-cpu;
> +			qcom,skip-power-up;
>  
>  			out-ports {
>  				port {
> @@ -1905,6 +1910,7 @@
>  			clocks = <&aoss_qmp>;
>  			clock-names = "apb_pclk";
>  			arm,coresight-loses-context-with-cpu;
> +			qcom,skip-power-up;
>  
>  			out-ports {
>  				port {
> @@ -1924,6 +1930,7 @@
>  			clocks = <&aoss_qmp>;
>  			clock-names = "apb_pclk";
>  			arm,coresight-loses-context-with-cpu;
> +			qcom,skip-power-up;
>  
>  			out-ports {
>  				port {
> @@ -1943,6 +1950,7 @@
>  			clocks = <&aoss_qmp>;
>  			clock-names = "apb_pclk";
>  			arm,coresight-loses-context-with-cpu;
> +			qcom,skip-power-up;

Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>

>  
>  			out-ports {
>  				port {
> -- 
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
>