linux-kernel - Re: [PATCH RFC 0/4] DDR/L3 Scaling support on SDM845 SoCs

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Date:   Wed, 10 Jul 2019 19:44:37 +0530
From:   Sibi Sankar <sibis@...eaurora.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     nm@...com, sboyd@...nel.org, georgi.djakov@...aro.org,
        agross@...nel.org, david.brown@...aro.org, robh+dt@...nel.org,
        mark.rutland@....com, rjw@...ysocki.net,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        saravanak@...gle.com, linux-kernel-owner@...r.kernel.org,
        adharmap@...eaurora.org
Subject: Re: [PATCH RFC 0/4] DDR/L3 Scaling support on SDM845 SoCs

Hey Viresh,

On 2019-07-01 14:59, Viresh Kumar wrote:
> On 27-06-19, 19:04, Sibi Sankar wrote:
>> This RFC series aims to extend cpu based scaling support to L3/DDR on
>> SDM845 SoCs. The patch series depends on "Introduce OPP bandwidth 
>> bindings"
>> series (https://patchwork.kernel.org/cover/10912993/). A part of the
>> series will still be applicable if we decide to go ahead with the 
>> proposal
>> from Saravana as well so I decided to post this out.
>> 
>> v2:
>> * Incorporated Viresh's comments from:
>> [1]https://lore.kernel.org/lkml/20190410102429.r6j6brm5kspmqxc3@vireshk-i7/
>> [2]https://lore.kernel.org/lkml/20190410112516.gnh77jcwawvld6et@vireshk-i7/
> 
> Did you get a chance to look at this ?
> 
> lore.kernel.org/lkml/20190622003449.33707-1-saravanak@...gle.com

Yes, I have v2 of cpufreq passive governor
patch in the works based on Saravana's
series. I plan on posting it out end of
week. I had sent this series out
since a portion (specifically update_
voltage helper and adding opp_tables
to cpufreq-hw driver) would remain
constant irrespective of the path
we choose.

FWIW, on SDM845 SoCs we cannot use a
rpmh_write_batch based icc_set on
cpufreq fast switch pathw since it
uses the "wait_for_completion" api.


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