linux-kernel - Re: [PATCH v9 5/8] soc/tegra: pmc: Implement get_performance

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Date:   Fri, 27 Aug 2021 07:08:18 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Viresh Kumar <vireshk@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>, Nishanth Menon <nm@...com>,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v9 5/8] soc/tegra: pmc: Implement get_performance_state()
 callback

27.08.2021 07:02, Viresh Kumar пишет:
> On 27-08-21, 06:47, Dmitry Osipenko wrote:
>> Actually, it doesn't work.
>>
>> The devm_tegra_core_dev_init_opp_table() needs to set clk to support older device-tree and now OPP table already has clk being set.
>>
>> WARNING: CPU: 2 PID: 92 at drivers/opp/core.c:2146 dev_pm_opp_set_clkname+0x97/0xb8
>> Modules linked in:
>> CPU: 2 PID: 92 Comm: kworker/u8:1 Tainted: G        W         5.14.0-rc7-next-20210826-00181-g6389463cbb0a #9318
>> Hardware name: NVIDIA Tegra SoC (Flattened Device Tree)
>> Workqueue: events_unbound deferred_probe_work_func
>> [<c010cc91>] (unwind_backtrace) from [<c0108d35>] (show_stack+0x11/0x14)
>> [<c0108d35>] (show_stack) from [<c0a6c1bd>] (dump_stack_lvl+0x2b/0x34)
>> [<c0a6c1bd>] (dump_stack_lvl) from [<c011fc47>] (__warn+0xbb/0x100)
>> [<c011fc47>] (__warn) from [<c0a696e3>] (warn_slowpath_fmt+0x4b/0x80)
>> [<c0a696e3>] (warn_slowpath_fmt) from [<c07407b3>] (dev_pm_opp_set_clkname+0x97/0xb8)
>> [<c07407b3>] (dev_pm_opp_set_clkname) from [<c07407e3>] (devm_pm_opp_set_clkname+0xf/0x64)
>> [<c07407e3>] (devm_pm_opp_set_clkname) from [<c050735b>] (devm_tegra_core_dev_init_opp_table+0x23/0x144)
> 
> Why are you calling this anymore ?

Older device-trees don't have OPPs, meanwhile drivers will use
dev_pm_opp_set_rate() and it requires OPP table to be set up using
devm_pm_opp_set_clkname().

The devm_tegra_core_dev_init_opp_table() is a common helper that sets up
OPP table for Tegra drivers and it sets the clk.