linux-kernel - Re: [PATCH] PM / devfreq: tegra: Set freq in rate callback

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Message-ID: <20160121105411.GA32212@ulmo>
Date:	Thu, 21 Jan 2016 11:54:11 +0100
From:	Thierry Reding <thierry.reding@...il.com>
To:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
Cc:	linux-kernel@...r.kernel.org, Tyler Baker <tyler.baker@...aro.org>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Alexandre Courbot <gnurou@...il.com>, linux-pm@...r.kernel.org,
	linux-tegra@...r.kernel.org
Subject: Re: [PATCH] PM / devfreq: tegra: Set freq in rate callback

On Thu, Jan 21, 2016 at 08:52:26AM +0100, Tomeu Vizoso wrote:
> As per the documentation of the devfreq_dev_profile.target callback, set
> the freq argument to the new frequency before returning.
> 
> This caused endless messages like this after recent changes in the core:
> 
> devfreq 6000c800.actmon: Couldn't update frequency transition information.
> 
> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
> Reported-by: Tyler Baker <tyler.baker@...aro.org>
> ---
>  drivers/devfreq/tegra-devfreq.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/devfreq/tegra-devfreq.c b/drivers/devfreq/tegra-devfreq.c
> index 848b93ee930f..fe9dce0245bf 100644
> --- a/drivers/devfreq/tegra-devfreq.c
> +++ b/drivers/devfreq/tegra-devfreq.c
> @@ -500,6 +500,8 @@ static int tegra_devfreq_target(struct device *dev, unsigned long *freq,
>  	clk_set_min_rate(tegra->emc_clock, rate);
>  	clk_set_rate(tegra->emc_clock, 0);
>  
> +	*freq = rate;
> +
>  	return 0;
>  }
>  

I had noticed it recently but hadn't got around to look into it, thanks
for fixing it.

Tested-by: Thierry Reding <treding@...dia.com>
Acked-by: Thierry Reding <treding@...dia.com>

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