linux-kernel - Re: [PATCH 2/4] interconnect: qcom: qcm2290: Set AB coefficients

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Date:   Wed, 26 Jul 2023 19:52:21 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Stephan Gerhold <stephan@...hold.net>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Georgi Djakov <djakov@...nel.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] interconnect: qcom: qcm2290: Set AB coefficients

On 26.07.2023 19:46, Konrad Dybcio wrote:
> On 26.07.2023 19:26, Stephan Gerhold wrote:
>> On Wed, Jul 26, 2023 at 07:20:27PM +0200, Konrad Dybcio wrote:
>>> On 26.07.2023 19:18, Stephan Gerhold wrote:
>>>> On Wed, Jul 26, 2023 at 06:25:44PM +0200, Konrad Dybcio wrote:
>>>>> Some buses need additional manual adjustments atop the usual
>>>>> calculations. Fill in the missing coefficients.
>>>>>
>>>>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>>>>
>>>> What about the funny util-fact/vrail-comp on the mas-apps-proc node
>>>> downstream?
>>> Can't see it neither on msm-5.4 (with the icc API) nor in the 4.19 (msmbus)
>>> device tree.
>>>
>>
>> Not sure where to get up-to-date device trees nowadays. The AOSP repo
>> I was looking at has this commit where it was added:
>> https://android.googlesource.com/kernel/msm-extra/devicetree/+/02f8c342b23c20a5cf967df649814be37a08227c%5E%21/#F0
> Oh right, take a look at this one:
> 
> https://git.codelinaro.org/clo/la/kernel/msm-4.14/-/commit/201df022706e100cef8d28983c6a7b883fcaec5a
> 
> I guess I'll need to update the icc driver then.
Moreover, this having vrail-comp = 96, means I'll have to go with
the wrecked downstream way of *(100/(percent)) instead of
*(percent/100)...

I also noticed that sm6125 makes very heavy use of per-node clocks..

Konrad