linux-kernel - Re: [PATCH v4 0/3] Introduce Bandwidth OPPs for interconnects

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Message-ID: <a9ab8614-7626-c309-24cc-02ce08a80ce5@codeaurora.org>
Date:   Tue, 30 Jul 2019 22:13:34 +0530
From:   Sibi Sankar <sibis@...eaurora.org>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        "Sweeney, Sean" <seansw@....qualcomm.com>,
        David Dai <daidavid1@...eaurora.org>, adharmap@...eaurora.org,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Evan Green <evgreen@...omium.org>,
        Android Kernel Team <kernel-team@...roid.com>,
        Linux PM <linux-pm@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 0/3] Introduce Bandwidth OPPs for interconnects

On 7/30/19 11:23 AM, Saravana Kannan wrote:
> On Mon, Jul 29, 2019 at 10:28 PM Sibi Sankar <sibis@...eaurora.org> wrote:
>>
>> Hey Viresh,
>>
>> On 7/30/19 8:16 AM, Viresh Kumar wrote:
>>> On 29-07-19, 13:16, Saravana Kannan wrote:
>>>> Sibi might be working on doing that for the SDM845 CPUfreq driver.
>>>> Georgi could also change his GPU driver use case to use this BW OPP
>>>> table and required-opps.
>>>>
>>>> The problem is that people don't want to start using this until we
>>>> decide on the DT representation. So it's like a chicken and egg
>>>> situation.
>>>
>>> Yeah, I agree to that.
>>>
>>> @Georgi and @Sibi: This is your chance to speak up about the proposal
>>> from Saravana and if you find anything wrong with them. And specially
>>> that it is mostly about interconnects here, I would like to have an
>>> explicit Ack from Georgi on this.
>>>
>>> And if you guys are all okay about this then please at least commit
>>> that you will convert your stuff based on this in coming days.
>>
>> I've been using both Saravana's and Georgi's series for a while
>> now to scale DDR and L3 on SDM845. There is currently no consensus
>> as to where the votes are to be actuated from, hence couldn't post
>> anything out.
>>
>> DCVS based on Saravana's series + passive governor:
>> https://github.com/QuinAsura/linux/tree/lnext-072619-SK-series
> 
> Thanks Sibi! You might want to convert your patches so that until the
> passive governor is ready, you just look up the required opps and vote
> for BW directly from the cpufreq driver. Once devfreq governor is
> ready, you can switch to it.

Sure I'll do that.

> 
> -Saravana
> 
>>
>> DCVS based on Georgi's series: (I had already posted this out)
>> https://github.com/QuinAsura/linux/tree/lnext-072619-GJ-series
>>
>> --
>> Qualcomm Innovation Center, Inc.
>> Qualcomm Innovation Center, Inc, is a member of Code Aurora Forum,
>> a Linux Foundation Collaborative Project

-- 
Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc, is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project