linux-kernel - Re: [PATCH v2 2/2] arm64: dts: qcom: sm8250: Add Coresight support

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Date:   Fri, 24 Sep 2021 18:04:00 +0800
From:   Tao Zhang <quic_taozha@...cinc.com>
To:     Suzuki K Poulose <suzuki.poulose@....com>
CC:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Mike Leach <mike.leach@...aro.org>,
        "Leo Yan" <leo.yan@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <coresight@...ts.linaro.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Tingwei Zhang <quic_tingweiz@...cinc.com>,
        Mao Jinlong <quic_jinlmao@...cinc.com>,
        Yuanfang Zhang <quic_yuanfang@...cinc.com>
Subject: Re: [PATCH v2 2/2] arm64: dts: qcom: sm8250: Add Coresight support

On Thu, Sep 23, 2021 at 10:36:28AM +0100, Suzuki K Poulose wrote:
> On 23/09/2021 10:24, Tao Zhang wrote:
> >On Tue, Sep 21, 2021 at 05:35:37PM +0100, Suzuki K Poulose wrote:
> >>Hi Tao
> >>
> >>Are there no sinks at all on this platform ? I had this question on the
> >>previous series. How is CoreSight useful on this platform otherwise ?
> >>
> >>On 13/09/2021 07:40, Tao Zhang wrote:
> >ETF/ETR are the sinks on this target. And I have added the ETF to this
> >device tree file. Since the ETR needs SMMU support on this target and
> >SMMU has not been supported for now. I will add the ETR to device tree
> >later if the SMMU is ready for this platform.
> 
> Thanks. That is fine. Btw, these sort of additional information could be
> added to the cover letter to give a better picture of what you are trying to
> do and why.
> 
Sure. I will update this to the cover letter.
> >>>Add the basic coresight components found on Qualcomm SM8250 Soc. The
> >>>basic coresight components include ETF, ETMs,STM and the related
> >>>funnels.
> >>>
> >>>Signed-off-by: Tao Zhang <quic_taozha@...cinc.com>
> >>>---
> >>>  arch/arm64/boot/dts/qcom/qrb5165-rb5.dts | 442 ++++++++++++++++++++++-
> >>>  1 file changed, 438 insertions(+), 4 deletions(-)
> >>>
> >>>diff --git a/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts b/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts
> >>>index 8ac96f8e79d4..9c8f87d80afc 100644
> >>>--- a/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts
> >>>+++ b/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts
> >>>@@ -222,11 +222,445 @@
> >>>  		regulator-max-microvolt = <1800000>;
> >>>  		regulator-always-on;
> >>>  	};
> >>>-};
> >>>-&adsp {
> >>>-	status = "okay";
> >>>-	firmware-name = "qcom/sm8250/adsp.mbn";
> >>
> >>Unrelated change ? Please keep it separate from the CoreSight changes.
> >>
> >>Suzuki
> >I combined this change and ETM pid change into one seies because the ETM
> >pid change validation needs ETM support. If there is no ETM
> >configuration in the device tree, ETM pid change can not be verified.
> >Do you think it would be better to separate them? Do I need to resubmit
> >to separate them into two separate patches?
> 
> No, I am asking about the lines removed above. i.e,
> 
>  -&adsp {
>  -	status = "okay";
>  -	firmware-name = "qcom/sm8250/adsp.mbn";
> 
> It doesn't seem to be added back in the patch. So that means, the DT
> lost those lines, without any mention of that in the description of
> the patch. Moreover, the lines do not look like they were anything to
> do with CoreSight. This is why I mentioned they look like "unrelated".
> 
> Suzuki
Yes, you are right. This is a mistake. This part of code should not be removed.
I will update the patch and resubmit it.

Best,
Tao