linux-kernel - Re: [PATCH 5/5] OPP: Remove custom OPP helper support

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Date:   Mon, 27 Jun 2022 10:09:11 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Keerthy <j-keerthy@...com>, Dave Gerlach <d-gerlach@...com>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        linux-kernel@...r.kernel.org,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH 5/5] OPP: Remove custom OPP helper support

27.06.2022 09:41, Viresh Kumar пишет:
> On 27-06-22, 09:10, Dmitry Osipenko wrote:
>> Okay, but Tegra 3d driver doesn't need config_regulators(), it needs
>> customized set_opp() to set clock rate for both 3d engines.
> 
> What does that mean, you need to set two clocks ? There is separate
> support added for that already [1].
> 

Yes, I missed that multi-clock OPP patch, thanks.

Seems _opp_compare_key() won't work properly for the multi-clocks since
Tegra doesn't have bandwidth nor level for the 3d OPPs. Why does it need
to check opp_table->clk_count == 1? Shouldn't it be opp_table->clk_count
> 0?