linux-kernel - Re: [PATCH] powercap/drivers/dtpm: Disable dtpm at boot time

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Date:   Sat, 27 Nov 2021 00:10:50 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     dsmythies@...us.net, rafael@...nel.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        lukasz.luba@....com, gregkh@...uxfoundation.org,
        Daniel Lezcano <daniel.lezcano@...nel.org>
Subject: Re: [PATCH] powercap/drivers/dtpm: Disable dtpm at boot time


Hi Doug,

I was unable to reproduce the issue because I don't have an x86 platform.

Is it possible to check if this fix is ok?

  -- Daniel

On 27/11/2021 00:08, Daniel Lezcano wrote:
> The DTPM framework misses a mechanism to set it up. That is currently
> under review but will come after the next cycle.
> 
> As the distro are enabling all the kernel options, the DTPM framework
> is enabled on platforms where the energy model is not implemented,
> thus making the framework inconsistent and disrupting the CPU
> frequency scaling service.
> 
> Remove the initialization at boot time as a hot fix.
> 
> Fixes: 7a89d7eacf8e ("powercap/drivers/dtpm: Simplify the dtpm table")
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> ---
>  drivers/powercap/dtpm.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/drivers/powercap/dtpm.c b/drivers/powercap/dtpm.c
> index b9fac786246a..fb35c5828bfb 100644
> --- a/drivers/powercap/dtpm.c
> +++ b/drivers/powercap/dtpm.c
> @@ -471,9 +471,6 @@ static int __init init_dtpm(void)
>  		return PTR_ERR(pct);
>  	}
>  
> -	for_each_dtpm_table(dtpm_descr)
> -		dtpm_descr->init();
> -
>  	return 0;
>  }
>  late_initcall(init_dtpm);
> 


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