linux-kernel - Re: [PATCH] cpufreq: powernv: Dont assume distinct pstate values for nominal and pmin

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Message-ID: <20180112090727.GN3626@vireshk-i7>
Date:   Fri, 12 Jan 2018 14:37:27 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
Cc:     rjw@...ysocki.net, mpe@...erman.id.au, linux-pm@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        ego@...ux.vnet.ibm.com, svaidy@...ux.vnet.ibm.com,
        akshay.adiga@...ux.vnet.ibm.com, huntbag@...ux.vnet.ibm.com
Subject: Re: [PATCH] cpufreq: powernv: Dont assume distinct pstate values for
 nominal and pmin

On 12-01-18, 12:43, Shilpasri G Bhat wrote:
> Some OpenPOWER boxes can have same pstate values for nominal and
> pmin pstates. In these boxes the current code will not initialize
> 'powernv_pstate_info.min' variable and result in erroneous CPU
> frequency reporting. This patch fixes this problem.
> 
> Fixes: 09ca4c9b5958 ("cpufreq: powernv: Replacing pstate_id with frequency table index")
> Reported-by: Alvin Wang <wangat@...ibm.com>
> Signed-off-by: Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
> ---
>  drivers/cpufreq/powernv-cpufreq.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c
> index b6d7c4c..da7fdb4 100644
> --- a/drivers/cpufreq/powernv-cpufreq.c
> +++ b/drivers/cpufreq/powernv-cpufreq.c
> @@ -288,9 +288,9 @@ static int init_powernv_pstates(void)
>  
>  		if (id == pstate_max)
>  			powernv_pstate_info.max = i;
> -		else if (id == pstate_nominal)
> +		if (id == pstate_nominal)
>  			powernv_pstate_info.nominal = i;
> -		else if (id == pstate_min)
> +		if (id == pstate_min)
>  			powernv_pstate_info.min = i;
>  
>  		if (powernv_pstate_info.wof_enabled && id == pstate_turbo) {

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>

-- 
viresh