linux-kernel - Re: [PATCH v2 04/19] PM / devfreq: tegra: Don't set EMC clock rate to maximum on probe

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Date:   Tue, 16 Apr 2019 10:59:46 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Dmitry Osipenko <digetx@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>
Cc:     linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v2 04/19] PM / devfreq: tegra: Don't set EMC clock rate
 to maximum on probe

Hi,

On 19. 4. 15. 오후 11:54, Dmitry Osipenko wrote:
> There is no real benefit from doing so, hence let's drop that rate setting
> for consistency.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/devfreq/tegra-devfreq.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/devfreq/tegra-devfreq.c b/drivers/devfreq/tegra-devfreq.c
> index 69581c9082d4..d62fb1b0d9bb 100644
> --- a/drivers/devfreq/tegra-devfreq.c
> +++ b/drivers/devfreq/tegra-devfreq.c
> @@ -648,8 +648,6 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
>  		return PTR_ERR(tegra->emc_clock);
>  	}
>  
> -	clk_set_rate(tegra->emc_clock, ULONG_MAX);
> -

It seems like that initialize the emc_clock as the supported maximum clock.
But, if the rate for emc_clock initialized by either bootloader or clock driver
and it's well working until this code, actually, it is not necessary.

Looks good to me.
Reviewed-by: Chanwoo Choi <cw00.choi@...sung.com>


>  	tegra->rate_change_nb.notifier_call = tegra_actmon_rate_notify_cb;
>  	err = clk_notifier_register(tegra->emc_clock, &tegra->rate_change_nb);
>  	if (err) {
> 


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics