linux-kernel - Re: [PATCH 5/8] OPP: Allow multiple clocks for a device

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Message-ID: <7c661c98-0cd2-1732-d60c-3202643926a5@collabora.com>
Date:   Mon, 4 Jul 2022 21:04:53 +0300
From:   Dmitry Osipenko <dmitry.osipenko@...labora.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Jon Hunter <jonathanh@...dia.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>, linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        linux-kernel@...r.kernel.org,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH 5/8] OPP: Allow multiple clocks for a device

On 7/4/22 18:52, Viresh Kumar wrote:
> On 04-07-22, 16:17, Dmitry Osipenko wrote:
>> Actually the freq was 0 and it was 1 on the next loop like you suggested.
>>
>> Previously, the _read_opp_key() was always reading the opp-hz. Now it
>> skips reading the rates in _read_rate() because opp_table->clk_count=0
>> for the tegra30-devfreq driver the uses devm_pm_opp_of_add_table_noclk().
> 
> This is exactly what I wrote in an earlier email :)
> 
> Anyway, I have pushed two patches on top of my opp/linux-next branch
> and they should fix it in a good way now I suppose. Can you please
> give that a try.
> 
> This is how the diff looks like:
> 
> PM / devfreq: tegra30: Register config_clks helper
> 
> There is a corner case with Tegra30, where we want to skip clk
> configuration via dev_pm_opp_set_opp(), but still want the OPP core to
> read the "opp-hz" property so we can find the right OPP via freq finding
> helpers.
> 
> The OPP core provides support for the platforms to provide config_clks
> helpers now, lets use them instead of devm_pm_opp_of_add_table_noclk()
> to achieve the same result, as the OPP core won't parse the DT's
> "opp-hz" property if the clock isn't provided.

Works, thanks you!

Tested-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>

-- 
Best regards,
Dmitry