linux-kernel - Re: [PATCH v3 0/6] Introduce Bandwidth OPPs for interconnect paths

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Date:   Wed, 3 Jul 2019 13:35:44 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     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>,
        seansw@....qualcomm.com, daidavid1@...eaurora.org,
        Rajendra Nayak <rnayak@...eaurora.org>, sibis@...eaurora.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        evgreen@...omium.org,
        Android Kernel Team <kernel-team@...roid.com>,
        Linux PM <linux-pm@...r.kernel.org>,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 0/6] Introduce Bandwidth OPPs for interconnect paths

On Tue, Jul 2, 2019 at 11:36 PM Viresh Kumar <viresh.kumar@...aro.org> wrote:
>
> On 02-07-19, 18:10, Saravana Kannan wrote:
> > Interconnects and interconnect paths quantify their performance levels in
> > terms of bandwidth and not in terms of frequency. So similar to how we have
> > frequency based OPP tables in DT and in the OPP framework, we need
> > bandwidth OPP table support in the OPP framework and in DT. Since there can
> > be more than one interconnect path used by a device, we also need a way to
> > assign a bandwidth OPP table to an interconnect path.
> >
> > This patch series:
> > - Adds opp-peak-KBps and opp-avg-KBps properties to OPP DT bindings
> > - Adds interconnect-opp-table property to interconnect DT bindings
> > - Adds OPP helper functions for bandwidth OPP tables
> > - Adds icc_get_opp_table() to get the OPP table for an interconnect path
> >
> > So with the DT bindings added in this patch series, the DT for a GPU
> > that does bandwidth voting from GPU to Cache and GPU to DDR would look
> > something like this:
>
> And what changed since V2 ?

Sorry, forgot to put that in. I just dropped a lot of patches that
weren't relevant to the idea of BW OPPs and tying them to
interconnects.

-Saravana