linux-kernel - Re: [PATCH v2] thermal: devfreq_cooling: Fix perf state when calculate dfc res

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Date: Wed, 27 Mar 2024 16:29:11 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Lukasz Luba <lukasz.luba@....com>, Ye Zhang <ye.zhang@...k-chips.com>
Cc: tao.huang@...k-chips.com, heiko@...ech.de, daniel.lezcano@...aro.org, 
	finley.xiao@...k-chips.com, linux-rockchip@...ts.infradead.org, 
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, rui.zhang@...el.com
Subject: Re: [PATCH v2] thermal: devfreq_cooling: Fix perf state when
 calculate dfc res_util

On Fri, Mar 22, 2024 at 9:50 AM Lukasz Luba <lukasz.luba@....com> wrote:
>
>
>
> On 3/21/24 10:21, Ye Zhang wrote:
> > The issue occurs when the devfreq cooling device uses the EM power model
> > and the get_real_power() callback is provided by the driver.
> >
> > The EM power table is sorted ascending，can't index the table by cooling
> > device state，so convert cooling state to performance state by
> > dfc->max_state - dfc->capped_state.
> >
> > Fixes: 615510fe13bd ("thermal: devfreq_cooling: remove old power model and use EM")
> > Cc: 5.11+ <stable@...r.kernel.org> # 5.11+
> > Signed-off-by: Ye Zhang <ye.zhang@...k-chips.com>
> > ---
> > v1 -> v2:
> >    - Update the commit message.
> >
> >   drivers/thermal/devfreq_cooling.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/thermal/devfreq_cooling.c b/drivers/thermal/devfreq_cooling.c
> > index 50dec24e967a..8fd7cf1932cd 100644
> > --- a/drivers/thermal/devfreq_cooling.c
> > +++ b/drivers/thermal/devfreq_cooling.c
> > @@ -214,7 +214,7 @@ static int devfreq_cooling_get_requested_power(struct thermal_cooling_device *cd
> >
> >               res = dfc->power_ops->get_real_power(df, power, freq, voltage);
> >               if (!res) {
> > -                     state = dfc->capped_state;
> > +                     state = dfc->max_state - dfc->capped_state;
> >
> >                       /* Convert EM power into milli-Watts first */
> >                       rcu_read_lock();
>
> Thanks, LGTM
>
> Reviewed-by: Lukasz Luba <lukasz.luba@....com>

Applied as 6.9-rc material, thanks!