linux-kernel - Re: [PATCH 1/2] arm64: dts: qcom: sc7180: Support ETMv4 power management

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Date:   Mon, 18 May 2020 11:51:24 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
Cc:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>, devicetree@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, coresight@...ts.linaro.org
Subject: Re: [PATCH 1/2] arm64: dts: qcom: sc7180: Support ETMv4 power
 management

On Fri 15 May 03:55 PDT 2020, Sai Prakash Ranjan wrote:

> Hi Bjorn,
> 

Hi Sai,

> On 2020-05-15 16:21, Sai Prakash Ranjan wrote:
> > Now that deep idle states are properly supported on SC7180,
> > we need to add "coresight-loses-context-with-cpu" property
> > to avoid failure of trace session because of losing context
> > on entering deep idle states.
> > 
> > Reviewed-by: Stephen Boyd <swboyd@...omium.org>
> > Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
> > ---
> > 
> > Resending this because the last patch sent here -
> > https://lore.kernel.org/patchwork/patch/1230367/
> > seems to have added "coresight-loses-context-with-cpu" to
> > replicator node instead of etm7 node.
> > 
> > ---
> >  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 4069bb1c93af..8b3707347547 100644
> > --- a/arch/arm64/boot/dts/qcom/sc7180.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> > @@ -1656,6 +1656,7 @@
> > 
> >  			clocks = <&aoss_qmp>;
> >  			clock-names = "apb_pclk";
> > +			arm,coresight-loses-context-with-cpu;
> > 
> >  			out-ports {
> >  				port {
> > @@ -1674,6 +1675,7 @@
> > 
> >  			clocks = <&aoss_qmp>;
> >  			clock-names = "apb_pclk";
> > +			arm,coresight-loses-context-with-cpu;
> > 
> >  			out-ports {
> >  				port {
> > @@ -1692,6 +1694,7 @@
> > 
> >  			clocks = <&aoss_qmp>;
> >  			clock-names = "apb_pclk";
> > +			arm,coresight-loses-context-with-cpu;
> > 
> >  			out-ports {
> >  				port {
> > @@ -1710,6 +1713,7 @@
> > 
> >  			clocks = <&aoss_qmp>;
> >  			clock-names = "apb_pclk";
> > +			arm,coresight-loses-context-with-cpu;
> > 
> >  			out-ports {
> >  				port {
> > @@ -1728,6 +1732,7 @@
> > 
> >  			clocks = <&aoss_qmp>;
> >  			clock-names = "apb_pclk";
> > +			arm,coresight-loses-context-with-cpu;
> > 
> >  			out-ports {
> >  				port {
> > @@ -1746,6 +1751,7 @@
> > 
> >  			clocks = <&aoss_qmp>;
> >  			clock-names = "apb_pclk";
> > +			arm,coresight-loses-context-with-cpu;
> > 
> >  			out-ports {
> >  				port {
> > @@ -1764,6 +1770,7 @@
> > 
> >  			clocks = <&aoss_qmp>;
> >  			clock-names = "apb_pclk";
> > +			arm,coresight-loses-context-with-cpu;
> > 
> >  			out-ports {
> >  				port {
> > @@ -1782,6 +1789,7 @@
> > 
> >  			clocks = <&aoss_qmp>;
> >  			clock-names = "apb_pclk";
> > +			arm,coresight-loses-context-with-cpu;
> > 
> >  			out-ports {
> >  				port {
> 
> 
> The previous version of this patch in QCOM tree seems to have added the
> property to replicator node instead of etm7 node, can you please drop
> that from the tree and apply this one?
> 

I'm not able to replace the old commit without rewriting the history of
the branch. So I've applied a patch ontop of the branch to fix this up
instead.

Please review the branch and let me know if there's any issues.

Regards,
Bjorn