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From: Dmitry Osipenko <digetx@gmail.com>
To: Viresh Kumar <viresh.kumar@linaro.org>,
	MyungJoo Ham <myungjoo.ham@samsung.com>,
	Kyungmin Park <kyungmin.park@samsung.com>,
	Chanwoo Choi <cw00.choi@samsung.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Jonathan Hunter <jonathanh@nvidia.com>
Cc: linux-pm@vger.kernel.org,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Rafael Wysocki <rjw@rjwysocki.net>,
	Stephen Boyd <sboyd@kernel.org>, Nishanth Menon <nm@ti.com>,
	linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH V2 11/13] devfreq: tegra30: Migrate to dev_pm_opp_set_opp()
Date: Wed, 27 Jan 2021 18:58:31 +0300	[thread overview]
Message-ID: <b5f1065b-14ad-adae-af1c-e9962e6626ad@gmail.com> (raw)
In-Reply-To: <20210127100234.vl2wwe7rjrrz4btz@vireshk-i7>

27.01.2021 13:02, Viresh Kumar пишет:
> On 27-01-21, 14:40, Viresh Kumar wrote:
>> dev_pm_opp_set_bw() is getting removed and dev_pm_opp_set_opp() should
>> be used instead. Migrate to the new API.
>>
>> We don't want the OPP core to manage the clk for this driver, migrate to
>> dev_pm_opp_of_add_table_noclk() to make sure dev_pm_opp_set_opp()
>> doesn't have any side effects.
>>
>> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
>> ---
>> Dmitry,
>>
>> This is based over the patches sent here:
>>
>> https://lore.kernel.org/lkml/6c2160ff30a8f421563793020264cf9f533f293c.1611738228.git.viresh.kumar@linaro.org/
>>
>> This should fix the problem you mentioned earlier. Will push this for
>> linux-next unless you have any issues with it.
>>
>>  drivers/devfreq/tegra30-devfreq.c | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c
>> index 117cad7968ab..31f7dec5990b 100644
>> --- a/drivers/devfreq/tegra30-devfreq.c
>> +++ b/drivers/devfreq/tegra30-devfreq.c
>> @@ -647,7 +647,7 @@ static int tegra_devfreq_target(struct device *dev, unsigned long *freq,
>>  		return PTR_ERR(opp);
>>  	}
>>  
>> -	ret = dev_pm_opp_set_bw(dev, opp);
>> +	ret = dev_pm_opp_set_opp(dev, opp);
>>  	dev_pm_opp_put(opp);
>>  
>>  	return ret;
>> @@ -849,7 +849,7 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
>>  		return err;
>>  	}
>>  
>> -	err = dev_pm_opp_of_add_table(&pdev->dev);
>> +	err = dev_pm_opp_of_add_table_noclk(&pdev->dev);
> 
> Plus this, somehow was left uncommited in my tree :(
> 
> diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c
> index 31f7dec5990b..ce83f883ca65 100644
> --- a/drivers/devfreq/tegra30-devfreq.c
> +++ b/drivers/devfreq/tegra30-devfreq.c
> @@ -849,7 +849,7 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
>                 return err;
>         }
>  
> -       err = dev_pm_opp_of_add_table_noclk(&pdev->dev);
> +       err = dev_pm_opp_of_add_table_noclk(&pdev->dev, 0);
>         if (err) {
>                 dev_err(&pdev->dev, "Failed to add OPP table: %d\n", err);
>                 goto put_hw;
> 

Sadly this doesn't work because we missed that clk is assigned to
opp_table when OPP table is allocated and not when it's added to device.

Hence we're now set back to the dev_pm_opp_clear_clk() variant.

What about to add a new OPP API which will allow OPP users to configure
behaviour that user wants from OPP core in a generic way, something like
this:

struct opp_config {
	bool no_clk;
	...
};

devm_pm_opp_set_config(dev, struct opp_config);
dev_pm_opp_set_config(dev, struct opp_config);
dev_pm_opp_unset_config(dev);

Or maybe even rename it dev_pm_opp_allocate_table(dev, struct
opp_config), which will allow users to directly allocate OPP table
instead of relying on the implicit allocations. Then there won't be a
need for drivers to use a dummy devm_pm_opp_set_clkname(dev, NULL) just
to allocate the table usable for dev_pm_opp_set_rate().

  reply	other threads:[~2021-01-27 16:01 UTC|newest]

Thread overview: 73+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-21 11:17 [PATCH 00/13] opp: Implement dev_pm_opp_set_opp() Viresh Kumar
2021-01-21 11:17 ` Viresh Kumar
2021-01-21 11:17 ` Viresh Kumar
2021-01-21 11:17 ` [PATCH 01/13] opp: Rename _opp_set_rate_zero() Viresh Kumar
2021-01-21 11:17   ` Viresh Kumar
2021-01-21 11:17 ` [PATCH 02/13] opp: No need to check clk for errors Viresh Kumar
2021-01-21 11:17   ` Viresh Kumar
2021-01-21 11:17 ` [PATCH 03/13] opp: Keep track of currently programmed OPP Viresh Kumar
2021-01-21 11:17   ` Viresh Kumar
2021-01-21 21:41   ` Dmitry Osipenko
2021-01-21 21:41     ` Dmitry Osipenko
2021-01-22  4:45     ` Viresh Kumar
2021-01-22  4:45       ` Viresh Kumar
2021-01-22 14:31       ` Dmitry Osipenko
2021-01-22 14:31         ` Dmitry Osipenko
2021-01-25  3:12         ` Viresh Kumar
2021-01-25  3:12           ` Viresh Kumar
2021-01-27 16:31       ` Akhil P Oommen
2021-01-28  4:14         ` Viresh Kumar
2021-01-28  4:14           ` Viresh Kumar
2021-07-07 10:24   ` Ionela Voinescu
2021-07-07 10:24     ` Ionela Voinescu
2021-07-08  7:53     ` Viresh Kumar
2021-07-08  7:53       ` Viresh Kumar
2021-07-09  8:57       ` Ionela Voinescu
2021-07-09  8:57         ` Ionela Voinescu
2021-07-12  4:14         ` Viresh Kumar
2021-07-12  4:14           ` Viresh Kumar
2021-01-21 11:17 ` [PATCH 04/13] opp: Split _set_opp() out of dev_pm_opp_set_rate() Viresh Kumar
2021-01-21 11:17   ` Viresh Kumar
2021-01-21 11:17 ` [PATCH 05/13] opp: Allow _set_opp() to work for non-freq devices Viresh Kumar
2021-01-21 11:17   ` Viresh Kumar
2021-01-21 11:17 ` [PATCH 06/13] opp: Allow _generic_set_opp_regulator() " Viresh Kumar
2021-01-21 11:17   ` Viresh Kumar
2021-01-21 11:17 ` [PATCH 07/13] opp: Allow _generic_set_opp_clk_only() " Viresh Kumar
2021-01-21 11:17   ` Viresh Kumar
2021-01-21 20:26   ` Dmitry Osipenko
2021-01-21 20:26     ` Dmitry Osipenko
2021-01-22  4:35     ` Viresh Kumar
2021-01-22  4:35       ` Viresh Kumar
2021-01-25 21:09       ` Dmitry Osipenko
2021-01-25 21:09         ` Dmitry Osipenko
2021-01-27  6:58         ` Viresh Kumar
2021-01-27  6:58           ` Viresh Kumar
2021-01-21 11:17 ` [PATCH 08/13] opp: Update parameters of _set_opp_custom() Viresh Kumar
2021-01-21 11:17   ` Viresh Kumar
2021-01-21 11:17 ` [PATCH 09/13] opp: Implement dev_pm_opp_set_opp() Viresh Kumar
2021-01-21 11:17   ` Viresh Kumar
2021-01-21 11:17 ` [PATCH 10/13] cpufreq: qcom: Migrate to dev_pm_opp_set_opp() Viresh Kumar
2021-01-21 11:17   ` Viresh Kumar
2021-01-21 11:17 ` [PATCH 11/13] devfreq: tegra30: " Viresh Kumar
2021-01-21 11:17   ` Viresh Kumar
2021-01-21 21:36   ` Dmitry Osipenko
2021-01-21 21:36     ` Dmitry Osipenko
2021-01-22  6:26     ` Viresh Kumar
2021-01-22  6:26       ` Viresh Kumar
2021-01-22 15:28       ` Dmitry Osipenko
2021-01-22 15:28         ` Dmitry Osipenko
2021-01-25  3:14         ` Viresh Kumar
2021-01-25  3:14           ` Viresh Kumar
2021-01-25 16:00           ` Dmitry Osipenko
2021-01-25 16:00             ` Dmitry Osipenko
2021-01-27  9:10   ` [PATCH V2 " Viresh Kumar
2021-01-27 10:02     ` Viresh Kumar
2021-01-27 15:58       ` Dmitry Osipenko [this message]
2021-01-28  7:01         ` Viresh Kumar
2021-02-01  0:21     ` Chanwoo Choi
2021-02-01 19:57     ` Dmitry Osipenko
2021-01-21 11:17 ` [PATCH 12/13] drm: msm: " Viresh Kumar
2021-01-21 11:17   ` Viresh Kumar
2021-01-21 11:17   ` Viresh Kumar
2021-01-21 11:17 ` [PATCH 13/13] opp: Remove dev_pm_opp_set_bw() Viresh Kumar
2021-01-21 11:17   ` Viresh Kumar

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