linux-kernel - Re: [PATCH v3 3/5] OPP: Improve require-opps linking

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Date:   Mon, 27 Jan 2020 11:41:18 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Sibi Sankar <sibis@...eaurora.org>, kernel-team@...roid.com,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/5] OPP: Improve require-opps linking

On 25-11-19, 16:58, Viresh Kumar wrote:
> >From 8df083ca64d82ff57f778689271cc1be75aa99c4 Mon Sep 17 00:00:00 2001
> Message-Id: <8df083ca64d82ff57f778689271cc1be75aa99c4.1574681211.git.viresh.kumar@...aro.org>
> From: Viresh Kumar <viresh.kumar@...aro.org>
> Date: Mon, 25 Nov 2019 13:57:58 +0530
> Subject: [PATCH] opp: Allow lazy-linking of required-opps
> 
> The OPP core currently requires the required opp tables to be available
> before the dependent OPP table is added, as it needs to create links
> from the dependent OPP table to the required ones. This may not be
> convenient to all the platforms though, as this requires strict ordering
> of probing of drivers.
> 
> This patch allows lazy-linking of the required-opps. The OPP tables for
> which the required-opp-tables aren't available at the time of their
> initialization, are added to a special list of OPP tables:
> pending_opp_tables. Later on, whenever a new OPP table is registered
> with the OPP core, we check if it is required by an OPP table in the
> pending list; if yes, then we complete the linking then and there.
> 
> An OPP table is marked unusable until the time all its required-opp
> tables are available. And if lazy-linking fails for an OPP table, the
> OPP core disables all of its OPPs to make sure no one can use them.
> 
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>  drivers/opp/core.c |  13 ++++++
>  drivers/opp/of.c   | 113 +++++++++++++++++++++++++++++++++++++++++++--
>  drivers/opp/opp.h  |   4 +-
>  3 files changed, 124 insertions(+), 6 deletions(-)

I was hoping to queue this up for next release, any update on getting
this tested ?


-- 
viresh