linux-kernel - Re: [RFC PATCH 4/9] opp: core: Don't warn if required OPP device does not exist

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Message-ID: <20211012055143.xmkbvhbnolspgjin@vireshk-i7>
Date:   Tue, 12 Oct 2021 11:21:43 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Hector Martin <marcan@...can.st>,
        Sibi Sankar <sibis@...eaurora.org>,
        Saravana Kannan <saravanak@...gle.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Sven Peter <sven@...npeter.dev>, Marc Zyngier <maz@...nel.org>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Catalin Marinas <catalin.marinas@....com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 4/9] opp: core: Don't warn if required OPP device
 does not exist

On 12-10-21, 14:34, Hector Martin wrote:
> The table *is* assigned to a genpd (the memory controller), it's just that
> that genpd isn't actually a parent of the CPU device. Without the patch you
> end up with:
> 
> [    3.040060] cpu cpu4: Failed to set performance rate of cpu4: 0 (-19)
> [    3.042881] cpu cpu4: Failed to set required opps: -19
> [    3.045508] cpufreq: __target_index: Failed to change cpu frequency: -19

Hmm, Saravana and Sibi were working on a similar problem earlier and decided to
solve this using devfreq instead. Don't remember the exact series which got
merged for this, Sibi ?

If this part fails, how do you actually set the performance state of the memory
controller's genpd ?

-- 
viresh