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

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Date:   Mon, 4 Jul 2022 17:39:15 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Dmitry Osipenko <dmitry.osipenko@...labora.com>
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 30-06-22, 15:45, Viresh Kumar wrote:
> On 30-06-22, 12:57, Dmitry Osipenko wrote:
> > The set_freq_table() gets available freqs using
> > dev_pm_opp_find_freq_ceil() iteration.
> > 
> > The first dev_pm_opp_find_freq_ceil(freq=0) succeeds and returns ceil
> > freq=1.
> 
> I don't see how this can possibly happen. One possibility is that freq
> is set to 0 and one the next loop you do freq++, which can make it 1.
> 
> > The second dev_pm_opp_find_freq_ceil(freq=1) fails with -ERANGE.
> 
> Even if we send freq = 1, I don't see how we can get ERANGE if the OPP
> table is properly initialized.
> 
> > I haven't looked yet at why freq is set to 1.
> 
> Thanks, but I would need some help to get it debugged.

Hi Dmitry,

I am looking to send another version of this now and soon merge this
in for 5.20-rc1. Can you please help figure out what's going on here ?

Thanks.

-- 
viresh